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1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
9 | * - move L3 protocol dependent part to this file. | |
10 | * 23 Mar 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
11 | * - add get_features() to support various size of conntrack | |
12 | * structures. | |
13 | * | |
14 | * Derived from net/ipv4/netfilter/ip_conntrack_standalone.c | |
15 | */ | |
16 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/ip.h> | |
20 | #include <linux/netfilter.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/icmp.h> | |
24 | #include <linux/sysctl.h> | |
25 | #include <net/ip.h> | |
26 | ||
27 | #include <linux/netfilter_ipv4.h> | |
28 | #include <net/netfilter/nf_conntrack.h> | |
29 | #include <net/netfilter/nf_conntrack_helper.h> | |
30 | #include <net/netfilter/nf_conntrack_protocol.h> | |
31 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
32 | #include <net/netfilter/nf_conntrack_core.h> | |
33 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> | |
34 | ||
35 | #if 0 | |
36 | #define DEBUGP printk | |
37 | #else | |
38 | #define DEBUGP(format, args...) | |
39 | #endif | |
40 | ||
41 | DECLARE_PER_CPU(struct nf_conntrack_stat, nf_conntrack_stat); | |
42 | ||
43 | static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, | |
44 | struct nf_conntrack_tuple *tuple) | |
45 | { | |
46 | u_int32_t _addrs[2], *ap; | |
47 | ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), | |
48 | sizeof(u_int32_t) * 2, _addrs); | |
49 | if (ap == NULL) | |
50 | return 0; | |
51 | ||
52 | tuple->src.u3.ip = ap[0]; | |
53 | tuple->dst.u3.ip = ap[1]; | |
54 | ||
55 | return 1; | |
56 | } | |
57 | ||
58 | static int ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, | |
59 | const struct nf_conntrack_tuple *orig) | |
60 | { | |
61 | tuple->src.u3.ip = orig->dst.u3.ip; | |
62 | tuple->dst.u3.ip = orig->src.u3.ip; | |
63 | ||
64 | return 1; | |
65 | } | |
66 | ||
67 | static int ipv4_print_tuple(struct seq_file *s, | |
68 | const struct nf_conntrack_tuple *tuple) | |
69 | { | |
70 | return seq_printf(s, "src=%u.%u.%u.%u dst=%u.%u.%u.%u ", | |
71 | NIPQUAD(tuple->src.u3.ip), | |
72 | NIPQUAD(tuple->dst.u3.ip)); | |
73 | } | |
74 | ||
75 | static int ipv4_print_conntrack(struct seq_file *s, | |
76 | const struct nf_conn *conntrack) | |
77 | { | |
78 | return 0; | |
79 | } | |
80 | ||
81 | /* Returns new sk_buff, or NULL */ | |
82 | static struct sk_buff * | |
83 | nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user) | |
84 | { | |
85 | skb_orphan(skb); | |
86 | ||
87 | local_bh_disable(); | |
88 | skb = ip_defrag(skb, user); | |
89 | local_bh_enable(); | |
90 | ||
91 | if (skb) | |
92 | ip_send_check(skb->nh.iph); | |
93 | ||
94 | return skb; | |
95 | } | |
96 | ||
97 | static int | |
98 | ipv4_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff, | |
99 | u_int8_t *protonum) | |
100 | { | |
101 | /* Never happen */ | |
102 | if ((*pskb)->nh.iph->frag_off & htons(IP_OFFSET)) { | |
103 | if (net_ratelimit()) { | |
104 | printk(KERN_ERR "ipv4_prepare: Frag of proto %u (hook=%u)\n", | |
105 | (*pskb)->nh.iph->protocol, hooknum); | |
106 | } | |
107 | return -NF_DROP; | |
108 | } | |
109 | ||
110 | *dataoff = (*pskb)->nh.raw - (*pskb)->data + (*pskb)->nh.iph->ihl*4; | |
111 | *protonum = (*pskb)->nh.iph->protocol; | |
112 | ||
113 | return NF_ACCEPT; | |
114 | } | |
115 | ||
116 | int nat_module_is_loaded = 0; | |
117 | static u_int32_t ipv4_get_features(const struct nf_conntrack_tuple *tuple) | |
118 | { | |
119 | if (nat_module_is_loaded) | |
120 | return NF_CT_F_NAT; | |
121 | ||
122 | return NF_CT_F_BASIC; | |
123 | } | |
124 | ||
125 | static unsigned int ipv4_confirm(unsigned int hooknum, | |
126 | struct sk_buff **pskb, | |
127 | const struct net_device *in, | |
128 | const struct net_device *out, | |
129 | int (*okfn)(struct sk_buff *)) | |
130 | { | |
131 | /* We've seen it coming out the other side: confirm it */ | |
132 | return nf_conntrack_confirm(pskb); | |
133 | } | |
134 | ||
135 | static unsigned int ipv4_conntrack_help(unsigned int hooknum, | |
136 | struct sk_buff **pskb, | |
137 | const struct net_device *in, | |
138 | const struct net_device *out, | |
139 | int (*okfn)(struct sk_buff *)) | |
140 | { | |
141 | struct nf_conn *ct; | |
142 | enum ip_conntrack_info ctinfo; | |
143 | ||
144 | /* This is where we call the helper: as the packet goes out. */ | |
145 | ct = nf_ct_get(*pskb, &ctinfo); | |
146 | if (ct && ct->helper) { | |
147 | unsigned int ret; | |
148 | ret = ct->helper->help(pskb, | |
149 | (*pskb)->nh.raw - (*pskb)->data | |
150 | + (*pskb)->nh.iph->ihl*4, | |
151 | ct, ctinfo); | |
152 | if (ret != NF_ACCEPT) | |
153 | return ret; | |
154 | } | |
155 | return NF_ACCEPT; | |
156 | } | |
157 | ||
158 | static unsigned int ipv4_conntrack_defrag(unsigned int hooknum, | |
159 | struct sk_buff **pskb, | |
160 | const struct net_device *in, | |
161 | const struct net_device *out, | |
162 | int (*okfn)(struct sk_buff *)) | |
163 | { | |
164 | #if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE) | |
165 | /* Previously seen (loopback)? Ignore. Do this before | |
166 | fragment check. */ | |
167 | if ((*pskb)->nfct) | |
168 | return NF_ACCEPT; | |
169 | #endif | |
170 | ||
171 | /* Gather fragments. */ | |
172 | if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) { | |
173 | *pskb = nf_ct_ipv4_gather_frags(*pskb, | |
174 | hooknum == NF_IP_PRE_ROUTING ? | |
175 | IP_DEFRAG_CONNTRACK_IN : | |
176 | IP_DEFRAG_CONNTRACK_OUT); | |
177 | if (!*pskb) | |
178 | return NF_STOLEN; | |
179 | } | |
180 | return NF_ACCEPT; | |
181 | } | |
182 | ||
183 | static unsigned int ipv4_refrag(unsigned int hooknum, | |
184 | struct sk_buff **pskb, | |
185 | const struct net_device *in, | |
186 | const struct net_device *out, | |
187 | int (*okfn)(struct sk_buff *)) | |
188 | { | |
189 | struct rtable *rt = (struct rtable *)(*pskb)->dst; | |
190 | ||
191 | /* We've seen it coming out the other side: confirm */ | |
192 | if (ipv4_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT) | |
193 | return NF_DROP; | |
194 | ||
195 | /* Local packets are never produced too large for their | |
196 | interface. We degfragment them at LOCAL_OUT, however, | |
197 | so we have to refragment them here. */ | |
198 | if ((*pskb)->len > dst_mtu(&rt->u.dst) && | |
199 | !skb_shinfo(*pskb)->tso_size) { | |
200 | /* No hook can be after us, so this should be OK. */ | |
201 | ip_fragment(*pskb, okfn); | |
202 | return NF_STOLEN; | |
203 | } | |
204 | return NF_ACCEPT; | |
205 | } | |
206 | ||
207 | static unsigned int ipv4_conntrack_in(unsigned int hooknum, | |
208 | struct sk_buff **pskb, | |
209 | const struct net_device *in, | |
210 | const struct net_device *out, | |
211 | int (*okfn)(struct sk_buff *)) | |
212 | { | |
213 | return nf_conntrack_in(PF_INET, hooknum, pskb); | |
214 | } | |
215 | ||
216 | static unsigned int ipv4_conntrack_local(unsigned int hooknum, | |
217 | struct sk_buff **pskb, | |
218 | const struct net_device *in, | |
219 | const struct net_device *out, | |
220 | int (*okfn)(struct sk_buff *)) | |
221 | { | |
222 | /* root is playing with raw sockets. */ | |
223 | if ((*pskb)->len < sizeof(struct iphdr) | |
224 | || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) { | |
225 | if (net_ratelimit()) | |
226 | printk("ipt_hook: happy cracking.\n"); | |
227 | return NF_ACCEPT; | |
228 | } | |
229 | return nf_conntrack_in(PF_INET, hooknum, pskb); | |
230 | } | |
231 | ||
232 | /* Connection tracking may drop packets, but never alters them, so | |
233 | make it the first hook. */ | |
234 | static struct nf_hook_ops ipv4_conntrack_defrag_ops = { | |
235 | .hook = ipv4_conntrack_defrag, | |
236 | .owner = THIS_MODULE, | |
237 | .pf = PF_INET, | |
238 | .hooknum = NF_IP_PRE_ROUTING, | |
239 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
240 | }; | |
241 | ||
242 | static struct nf_hook_ops ipv4_conntrack_in_ops = { | |
243 | .hook = ipv4_conntrack_in, | |
244 | .owner = THIS_MODULE, | |
245 | .pf = PF_INET, | |
246 | .hooknum = NF_IP_PRE_ROUTING, | |
247 | .priority = NF_IP_PRI_CONNTRACK, | |
248 | }; | |
249 | ||
250 | static struct nf_hook_ops ipv4_conntrack_defrag_local_out_ops = { | |
251 | .hook = ipv4_conntrack_defrag, | |
252 | .owner = THIS_MODULE, | |
253 | .pf = PF_INET, | |
254 | .hooknum = NF_IP_LOCAL_OUT, | |
255 | .priority = NF_IP_PRI_CONNTRACK_DEFRAG, | |
256 | }; | |
257 | ||
258 | static struct nf_hook_ops ipv4_conntrack_local_out_ops = { | |
259 | .hook = ipv4_conntrack_local, | |
260 | .owner = THIS_MODULE, | |
261 | .pf = PF_INET, | |
262 | .hooknum = NF_IP_LOCAL_OUT, | |
263 | .priority = NF_IP_PRI_CONNTRACK, | |
264 | }; | |
265 | ||
266 | /* helpers */ | |
267 | static struct nf_hook_ops ipv4_conntrack_helper_out_ops = { | |
268 | .hook = ipv4_conntrack_help, | |
269 | .owner = THIS_MODULE, | |
270 | .pf = PF_INET, | |
271 | .hooknum = NF_IP_POST_ROUTING, | |
272 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
273 | }; | |
274 | ||
275 | static struct nf_hook_ops ipv4_conntrack_helper_in_ops = { | |
276 | .hook = ipv4_conntrack_help, | |
277 | .owner = THIS_MODULE, | |
278 | .pf = PF_INET, | |
279 | .hooknum = NF_IP_LOCAL_IN, | |
280 | .priority = NF_IP_PRI_CONNTRACK_HELPER, | |
281 | }; | |
282 | ||
283 | ||
284 | /* Refragmenter; last chance. */ | |
285 | static struct nf_hook_ops ipv4_conntrack_out_ops = { | |
286 | .hook = ipv4_refrag, | |
287 | .owner = THIS_MODULE, | |
288 | .pf = PF_INET, | |
289 | .hooknum = NF_IP_POST_ROUTING, | |
290 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, | |
291 | }; | |
292 | ||
293 | static struct nf_hook_ops ipv4_conntrack_local_in_ops = { | |
294 | .hook = ipv4_confirm, | |
295 | .owner = THIS_MODULE, | |
296 | .pf = PF_INET, | |
297 | .hooknum = NF_IP_LOCAL_IN, | |
298 | .priority = NF_IP_PRI_CONNTRACK_CONFIRM, | |
299 | }; | |
300 | ||
301 | #ifdef CONFIG_SYSCTL | |
302 | /* From nf_conntrack_proto_icmp.c */ | |
303 | extern unsigned long nf_ct_icmp_timeout; | |
304 | static struct ctl_table_header *nf_ct_ipv4_sysctl_header; | |
305 | ||
306 | static ctl_table nf_ct_sysctl_table[] = { | |
307 | { | |
308 | .ctl_name = NET_NF_CONNTRACK_ICMP_TIMEOUT, | |
309 | .procname = "nf_conntrack_icmp_timeout", | |
310 | .data = &nf_ct_icmp_timeout, | |
311 | .maxlen = sizeof(unsigned int), | |
312 | .mode = 0644, | |
313 | .proc_handler = &proc_dointvec_jiffies, | |
314 | }, | |
315 | { .ctl_name = 0 } | |
316 | }; | |
317 | ||
318 | static ctl_table nf_ct_netfilter_table[] = { | |
319 | { | |
320 | .ctl_name = NET_NETFILTER, | |
321 | .procname = "netfilter", | |
322 | .mode = 0555, | |
323 | .child = nf_ct_sysctl_table, | |
324 | }, | |
325 | { .ctl_name = 0 } | |
326 | }; | |
327 | ||
328 | static ctl_table nf_ct_net_table[] = { | |
329 | { | |
330 | .ctl_name = CTL_NET, | |
331 | .procname = "net", | |
332 | .mode = 0555, | |
333 | .child = nf_ct_netfilter_table, | |
334 | }, | |
335 | { .ctl_name = 0 } | |
336 | }; | |
337 | #endif | |
338 | ||
339 | /* Fast function for those who don't want to parse /proc (and I don't | |
340 | blame them). */ | |
341 | /* Reversing the socket's dst/src point of view gives us the reply | |
342 | mapping. */ | |
343 | static int | |
344 | getorigdst(struct sock *sk, int optval, void __user *user, int *len) | |
345 | { | |
346 | struct inet_sock *inet = inet_sk(sk); | |
347 | struct nf_conntrack_tuple_hash *h; | |
348 | struct nf_conntrack_tuple tuple; | |
349 | ||
350 | NF_CT_TUPLE_U_BLANK(&tuple); | |
351 | tuple.src.u3.ip = inet->rcv_saddr; | |
352 | tuple.src.u.tcp.port = inet->sport; | |
353 | tuple.dst.u3.ip = inet->daddr; | |
354 | tuple.dst.u.tcp.port = inet->dport; | |
355 | tuple.src.l3num = PF_INET; | |
356 | tuple.dst.protonum = IPPROTO_TCP; | |
357 | ||
358 | /* We only do TCP at the moment: is there a better way? */ | |
359 | if (strcmp(sk->sk_prot->name, "TCP")) { | |
360 | DEBUGP("SO_ORIGINAL_DST: Not a TCP socket\n"); | |
361 | return -ENOPROTOOPT; | |
362 | } | |
363 | ||
364 | if ((unsigned int) *len < sizeof(struct sockaddr_in)) { | |
365 | DEBUGP("SO_ORIGINAL_DST: len %u not %u\n", | |
366 | *len, sizeof(struct sockaddr_in)); | |
367 | return -EINVAL; | |
368 | } | |
369 | ||
370 | h = nf_conntrack_find_get(&tuple, NULL); | |
371 | if (h) { | |
372 | struct sockaddr_in sin; | |
373 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); | |
374 | ||
375 | sin.sin_family = AF_INET; | |
376 | sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
377 | .tuple.dst.u.tcp.port; | |
378 | sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] | |
379 | .tuple.dst.u3.ip; | |
380 | ||
381 | DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n", | |
382 | NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port)); | |
383 | nf_ct_put(ct); | |
384 | if (copy_to_user(user, &sin, sizeof(sin)) != 0) | |
385 | return -EFAULT; | |
386 | else | |
387 | return 0; | |
388 | } | |
389 | DEBUGP("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n", | |
390 | NIPQUAD(tuple.src.u3.ip), ntohs(tuple.src.u.tcp.port), | |
391 | NIPQUAD(tuple.dst.u3.ip), ntohs(tuple.dst.u.tcp.port)); | |
392 | return -ENOENT; | |
393 | } | |
394 | ||
395 | static struct nf_sockopt_ops so_getorigdst = { | |
396 | .pf = PF_INET, | |
397 | .get_optmin = SO_ORIGINAL_DST, | |
398 | .get_optmax = SO_ORIGINAL_DST+1, | |
399 | .get = &getorigdst, | |
400 | }; | |
401 | ||
402 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = { | |
403 | .l3proto = PF_INET, | |
404 | .name = "ipv4", | |
405 | .pkt_to_tuple = ipv4_pkt_to_tuple, | |
406 | .invert_tuple = ipv4_invert_tuple, | |
407 | .print_tuple = ipv4_print_tuple, | |
408 | .print_conntrack = ipv4_print_conntrack, | |
409 | .prepare = ipv4_prepare, | |
410 | .get_features = ipv4_get_features, | |
411 | .me = THIS_MODULE, | |
412 | }; | |
413 | ||
414 | extern struct nf_conntrack_protocol nf_conntrack_protocol_tcp4; | |
415 | extern struct nf_conntrack_protocol nf_conntrack_protocol_udp4; | |
416 | extern struct nf_conntrack_protocol nf_conntrack_protocol_icmp; | |
417 | static int init_or_cleanup(int init) | |
418 | { | |
419 | int ret = 0; | |
420 | ||
421 | if (!init) goto cleanup; | |
422 | ||
423 | ret = nf_register_sockopt(&so_getorigdst); | |
424 | if (ret < 0) { | |
425 | printk(KERN_ERR "Unable to register netfilter socket option\n"); | |
426 | goto cleanup_nothing; | |
427 | } | |
428 | ||
429 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_tcp4); | |
430 | if (ret < 0) { | |
431 | printk("nf_conntrack_ipv4: can't register tcp.\n"); | |
432 | goto cleanup_sockopt; | |
433 | } | |
434 | ||
435 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_udp4); | |
436 | if (ret < 0) { | |
437 | printk("nf_conntrack_ipv4: can't register udp.\n"); | |
438 | goto cleanup_tcp; | |
439 | } | |
440 | ||
441 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_icmp); | |
442 | if (ret < 0) { | |
443 | printk("nf_conntrack_ipv4: can't register icmp.\n"); | |
444 | goto cleanup_udp; | |
445 | } | |
446 | ||
447 | ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4); | |
448 | if (ret < 0) { | |
449 | printk("nf_conntrack_ipv4: can't register ipv4\n"); | |
450 | goto cleanup_icmp; | |
451 | } | |
452 | ||
453 | ret = nf_register_hook(&ipv4_conntrack_defrag_ops); | |
454 | if (ret < 0) { | |
455 | printk("nf_conntrack_ipv4: can't register pre-routing defrag hook.\n"); | |
456 | goto cleanup_ipv4; | |
457 | } | |
458 | ret = nf_register_hook(&ipv4_conntrack_defrag_local_out_ops); | |
459 | if (ret < 0) { | |
460 | printk("nf_conntrack_ipv4: can't register local_out defrag hook.\n"); | |
461 | goto cleanup_defragops; | |
462 | } | |
463 | ||
464 | ret = nf_register_hook(&ipv4_conntrack_in_ops); | |
465 | if (ret < 0) { | |
466 | printk("nf_conntrack_ipv4: can't register pre-routing hook.\n"); | |
467 | goto cleanup_defraglocalops; | |
468 | } | |
469 | ||
470 | ret = nf_register_hook(&ipv4_conntrack_local_out_ops); | |
471 | if (ret < 0) { | |
472 | printk("nf_conntrack_ipv4: can't register local out hook.\n"); | |
473 | goto cleanup_inops; | |
474 | } | |
475 | ||
476 | ret = nf_register_hook(&ipv4_conntrack_helper_in_ops); | |
477 | if (ret < 0) { | |
478 | printk("nf_conntrack_ipv4: can't register local helper hook.\n"); | |
479 | goto cleanup_inandlocalops; | |
480 | } | |
481 | ||
482 | ret = nf_register_hook(&ipv4_conntrack_helper_out_ops); | |
483 | if (ret < 0) { | |
484 | printk("nf_conntrack_ipv4: can't register postrouting helper hook.\n"); | |
485 | goto cleanup_helperinops; | |
486 | } | |
487 | ||
488 | ret = nf_register_hook(&ipv4_conntrack_out_ops); | |
489 | if (ret < 0) { | |
490 | printk("nf_conntrack_ipv4: can't register post-routing hook.\n"); | |
491 | goto cleanup_helperoutops; | |
492 | } | |
493 | ||
494 | ret = nf_register_hook(&ipv4_conntrack_local_in_ops); | |
495 | if (ret < 0) { | |
496 | printk("nf_conntrack_ipv4: can't register local in hook.\n"); | |
497 | goto cleanup_inoutandlocalops; | |
498 | } | |
499 | ||
500 | #ifdef CONFIG_SYSCTL | |
501 | nf_ct_ipv4_sysctl_header = register_sysctl_table(nf_ct_net_table, 0); | |
502 | if (nf_ct_ipv4_sysctl_header == NULL) { | |
503 | printk("nf_conntrack: can't register to sysctl.\n"); | |
504 | ret = -ENOMEM; | |
505 | goto cleanup_localinops; | |
506 | } | |
507 | #endif | |
508 | ||
509 | /* For use by REJECT target */ | |
510 | ip_ct_attach = __nf_conntrack_attach; | |
511 | ||
512 | return ret; | |
513 | ||
514 | cleanup: | |
515 | synchronize_net(); | |
516 | ip_ct_attach = NULL; | |
517 | #ifdef CONFIG_SYSCTL | |
518 | unregister_sysctl_table(nf_ct_ipv4_sysctl_header); | |
519 | cleanup_localinops: | |
520 | #endif | |
521 | nf_unregister_hook(&ipv4_conntrack_local_in_ops); | |
522 | cleanup_inoutandlocalops: | |
523 | nf_unregister_hook(&ipv4_conntrack_out_ops); | |
524 | cleanup_helperoutops: | |
525 | nf_unregister_hook(&ipv4_conntrack_helper_out_ops); | |
526 | cleanup_helperinops: | |
527 | nf_unregister_hook(&ipv4_conntrack_helper_in_ops); | |
528 | cleanup_inandlocalops: | |
529 | nf_unregister_hook(&ipv4_conntrack_local_out_ops); | |
530 | cleanup_inops: | |
531 | nf_unregister_hook(&ipv4_conntrack_in_ops); | |
532 | cleanup_defraglocalops: | |
533 | nf_unregister_hook(&ipv4_conntrack_defrag_local_out_ops); | |
534 | cleanup_defragops: | |
535 | nf_unregister_hook(&ipv4_conntrack_defrag_ops); | |
536 | cleanup_ipv4: | |
537 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4); | |
538 | cleanup_icmp: | |
539 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_icmp); | |
540 | cleanup_udp: | |
541 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_udp4); | |
542 | cleanup_tcp: | |
543 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_tcp4); | |
544 | cleanup_sockopt: | |
545 | nf_unregister_sockopt(&so_getorigdst); | |
546 | cleanup_nothing: | |
547 | return ret; | |
548 | } | |
549 | ||
550 | MODULE_LICENSE("GPL"); | |
551 | ||
552 | static int __init init(void) | |
553 | { | |
554 | need_nf_conntrack(); | |
555 | return init_or_cleanup(1); | |
556 | } | |
557 | ||
558 | static void __exit fini(void) | |
559 | { | |
560 | init_or_cleanup(0); | |
561 | } | |
562 | ||
563 | module_init(init); | |
564 | module_exit(fini); | |
565 | ||
566 | void need_ip_conntrack(void) | |
567 | { | |
568 | } | |
569 | ||
570 | EXPORT_SYMBOL(need_ip_conntrack); | |
571 | EXPORT_SYMBOL(nf_ct_ipv4_gather_frags); |