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9fb9cbb1 YK |
1 | /* |
2 | * Copyright (C)2004 USAGI/WIDE Project | |
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 | * Author: | |
9 | * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
10 | * | |
11 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
12 | * - support Layer 3 protocol independent connection tracking. | |
13 | * Based on the original ip_conntrack code which had the following | |
14 | * copyright information: | |
15 | * (C) 1999-2001 Paul `Rusty' Russell | |
16 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
17 | * | |
18 | * 23 Mar 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
19 | * - add get_features() to support various size of conntrack | |
20 | * structures. | |
21 | */ | |
22 | ||
23 | #include <linux/config.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/ipv6.h> | |
26 | #include <linux/in6.h> | |
27 | #include <linux/netfilter.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/icmp.h> | |
31 | #include <linux/sysctl.h> | |
32 | #include <net/ipv6.h> | |
33 | ||
34 | #include <linux/netfilter_ipv6.h> | |
35 | #include <net/netfilter/nf_conntrack.h> | |
36 | #include <net/netfilter/nf_conntrack_helper.h> | |
37 | #include <net/netfilter/nf_conntrack_protocol.h> | |
38 | #include <net/netfilter/nf_conntrack_l3proto.h> | |
39 | #include <net/netfilter/nf_conntrack_core.h> | |
40 | ||
41 | #if 0 | |
42 | #define DEBUGP printk | |
43 | #else | |
44 | #define DEBUGP(format, args...) | |
45 | #endif | |
46 | ||
47 | DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); | |
48 | ||
49 | static int ipv6_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, | |
50 | struct nf_conntrack_tuple *tuple) | |
51 | { | |
52 | u_int32_t _addrs[8], *ap; | |
53 | ||
54 | ap = skb_header_pointer(skb, nhoff + offsetof(struct ipv6hdr, saddr), | |
55 | sizeof(_addrs), _addrs); | |
56 | if (ap == NULL) | |
57 | return 0; | |
58 | ||
59 | memcpy(tuple->src.u3.ip6, ap, sizeof(tuple->src.u3.ip6)); | |
60 | memcpy(tuple->dst.u3.ip6, ap + 4, sizeof(tuple->dst.u3.ip6)); | |
61 | ||
62 | return 1; | |
63 | } | |
64 | ||
65 | static int ipv6_invert_tuple(struct nf_conntrack_tuple *tuple, | |
66 | const struct nf_conntrack_tuple *orig) | |
67 | { | |
68 | memcpy(tuple->src.u3.ip6, orig->dst.u3.ip6, sizeof(tuple->src.u3.ip6)); | |
69 | memcpy(tuple->dst.u3.ip6, orig->src.u3.ip6, sizeof(tuple->dst.u3.ip6)); | |
70 | ||
71 | return 1; | |
72 | } | |
73 | ||
74 | static int ipv6_print_tuple(struct seq_file *s, | |
75 | const struct nf_conntrack_tuple *tuple) | |
76 | { | |
77 | return seq_printf(s, "src=%x:%x:%x:%x:%x:%x:%x:%x dst=%x:%x:%x:%x:%x:%x:%x:%x ", | |
78 | NIP6(*((struct in6_addr *)tuple->src.u3.ip6)), | |
79 | NIP6(*((struct in6_addr *)tuple->dst.u3.ip6))); | |
80 | } | |
81 | ||
82 | static int ipv6_print_conntrack(struct seq_file *s, | |
83 | const struct nf_conn *conntrack) | |
84 | { | |
85 | return 0; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Based on ipv6_skip_exthdr() in net/ipv6/exthdr.c | |
90 | * | |
91 | * This function parses (probably truncated) exthdr set "hdr" | |
92 | * of length "len". "nexthdrp" initially points to some place, | |
93 | * where type of the first header can be found. | |
94 | * | |
95 | * It skips all well-known exthdrs, and returns pointer to the start | |
96 | * of unparsable area i.e. the first header with unknown type. | |
97 | * if success, *nexthdr is updated by type/protocol of this header. | |
98 | * | |
99 | * NOTES: - it may return pointer pointing beyond end of packet, | |
100 | * if the last recognized header is truncated in the middle. | |
101 | * - if packet is truncated, so that all parsed headers are skipped, | |
102 | * it returns -1. | |
103 | * - if packet is fragmented, return pointer of the fragment header. | |
104 | * - ESP is unparsable for now and considered like | |
105 | * normal payload protocol. | |
106 | * - Note also special handling of AUTH header. Thanks to IPsec wizards. | |
107 | */ | |
108 | ||
109 | int nf_ct_ipv6_skip_exthdr(struct sk_buff *skb, int start, u8 *nexthdrp, | |
110 | int len) | |
111 | { | |
112 | u8 nexthdr = *nexthdrp; | |
113 | ||
114 | while (ipv6_ext_hdr(nexthdr)) { | |
115 | struct ipv6_opt_hdr hdr; | |
116 | int hdrlen; | |
117 | ||
118 | if (len < (int)sizeof(struct ipv6_opt_hdr)) | |
119 | return -1; | |
120 | if (nexthdr == NEXTHDR_NONE) | |
121 | break; | |
122 | if (nexthdr == NEXTHDR_FRAGMENT) | |
123 | break; | |
124 | if (skb_copy_bits(skb, start, &hdr, sizeof(hdr))) | |
125 | BUG(); | |
126 | if (nexthdr == NEXTHDR_AUTH) | |
127 | hdrlen = (hdr.hdrlen+2)<<2; | |
128 | else | |
129 | hdrlen = ipv6_optlen(&hdr); | |
130 | ||
131 | nexthdr = hdr.nexthdr; | |
132 | len -= hdrlen; | |
133 | start += hdrlen; | |
134 | } | |
135 | ||
136 | *nexthdrp = nexthdr; | |
137 | return start; | |
138 | } | |
139 | ||
140 | static int | |
141 | ipv6_prepare(struct sk_buff **pskb, unsigned int hooknum, unsigned int *dataoff, | |
142 | u_int8_t *protonum) | |
143 | { | |
144 | unsigned int extoff; | |
145 | unsigned char pnum; | |
146 | int protoff; | |
147 | ||
148 | extoff = (u8*)((*pskb)->nh.ipv6h + 1) - (*pskb)->data; | |
149 | pnum = (*pskb)->nh.ipv6h->nexthdr; | |
150 | ||
151 | protoff = nf_ct_ipv6_skip_exthdr(*pskb, extoff, &pnum, | |
152 | (*pskb)->len - extoff); | |
153 | ||
154 | /* | |
155 | * (protoff == (*pskb)->len) mean that the packet doesn't have no data | |
156 | * except of IPv6 & ext headers. but it's tracked anyway. - YK | |
157 | */ | |
158 | if ((protoff < 0) || (protoff > (*pskb)->len)) { | |
159 | DEBUGP("ip6_conntrack_core: can't find proto in pkt\n"); | |
160 | NF_CT_STAT_INC(error); | |
161 | NF_CT_STAT_INC(invalid); | |
162 | return -NF_ACCEPT; | |
163 | } | |
164 | ||
165 | *dataoff = protoff; | |
166 | *protonum = pnum; | |
167 | return NF_ACCEPT; | |
168 | } | |
169 | ||
170 | static u_int32_t ipv6_get_features(const struct nf_conntrack_tuple *tuple) | |
171 | { | |
172 | return NF_CT_F_BASIC; | |
173 | } | |
174 | ||
175 | static unsigned int ipv6_confirm(unsigned int hooknum, | |
176 | struct sk_buff **pskb, | |
177 | const struct net_device *in, | |
178 | const struct net_device *out, | |
179 | int (*okfn)(struct sk_buff *)) | |
180 | { | |
181 | struct nf_conn *ct; | |
182 | enum ip_conntrack_info ctinfo; | |
183 | ||
184 | /* This is where we call the helper: as the packet goes out. */ | |
185 | ct = nf_ct_get(*pskb, &ctinfo); | |
186 | if (ct && ct->helper) { | |
187 | unsigned int ret, protoff; | |
188 | unsigned int extoff = (u8*)((*pskb)->nh.ipv6h + 1) | |
189 | - (*pskb)->data; | |
190 | unsigned char pnum = (*pskb)->nh.ipv6h->nexthdr; | |
191 | ||
192 | protoff = nf_ct_ipv6_skip_exthdr(*pskb, extoff, &pnum, | |
193 | (*pskb)->len - extoff); | |
194 | if (protoff < 0 || protoff > (*pskb)->len || | |
195 | pnum == NEXTHDR_FRAGMENT) { | |
196 | DEBUGP("proto header not found\n"); | |
197 | return NF_ACCEPT; | |
198 | } | |
199 | ||
200 | ret = ct->helper->help(pskb, protoff, ct, ctinfo); | |
201 | if (ret != NF_ACCEPT) | |
202 | return ret; | |
203 | } | |
204 | ||
205 | /* We've seen it coming out the other side: confirm it */ | |
206 | ||
207 | return nf_conntrack_confirm(pskb); | |
208 | } | |
209 | ||
210 | extern struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb); | |
211 | extern void nf_ct_frag6_output(unsigned int hooknum, struct sk_buff *skb, | |
212 | struct net_device *in, | |
213 | struct net_device *out, | |
214 | int (*okfn)(struct sk_buff *)); | |
215 | static unsigned int ipv6_defrag(unsigned int hooknum, | |
216 | struct sk_buff **pskb, | |
217 | const struct net_device *in, | |
218 | const struct net_device *out, | |
219 | int (*okfn)(struct sk_buff *)) | |
220 | { | |
221 | struct sk_buff *reasm; | |
222 | ||
223 | /* Previously seen (loopback)? */ | |
224 | if ((*pskb)->nfct) | |
225 | return NF_ACCEPT; | |
226 | ||
227 | reasm = nf_ct_frag6_gather(*pskb); | |
228 | ||
229 | /* queued */ | |
230 | if (reasm == NULL) | |
231 | return NF_STOLEN; | |
232 | ||
233 | /* error occured or not fragmented */ | |
234 | if (reasm == *pskb) | |
235 | return NF_ACCEPT; | |
236 | ||
237 | nf_ct_frag6_output(hooknum, reasm, (struct net_device *)in, | |
238 | (struct net_device *)out, okfn); | |
239 | ||
240 | return NF_STOLEN; | |
241 | } | |
242 | ||
243 | static unsigned int ipv6_conntrack_in(unsigned int hooknum, | |
244 | struct sk_buff **pskb, | |
245 | const struct net_device *in, | |
246 | const struct net_device *out, | |
247 | int (*okfn)(struct sk_buff *)) | |
248 | { | |
249 | struct sk_buff *reasm = (*pskb)->nfct_reasm; | |
250 | ||
251 | /* This packet is fragmented and has reassembled packet. */ | |
252 | if (reasm) { | |
253 | /* Reassembled packet isn't parsed yet ? */ | |
254 | if (!reasm->nfct) { | |
255 | unsigned int ret; | |
256 | ||
257 | ret = nf_conntrack_in(PF_INET6, hooknum, &reasm); | |
258 | if (ret != NF_ACCEPT) | |
259 | return ret; | |
260 | } | |
261 | nf_conntrack_get(reasm->nfct); | |
262 | (*pskb)->nfct = reasm->nfct; | |
263 | return NF_ACCEPT; | |
264 | } | |
265 | ||
266 | return nf_conntrack_in(PF_INET6, hooknum, pskb); | |
267 | } | |
268 | ||
269 | static unsigned int ipv6_conntrack_local(unsigned int hooknum, | |
270 | struct sk_buff **pskb, | |
271 | const struct net_device *in, | |
272 | const struct net_device *out, | |
273 | int (*okfn)(struct sk_buff *)) | |
274 | { | |
275 | /* root is playing with raw sockets. */ | |
276 | if ((*pskb)->len < sizeof(struct ipv6hdr)) { | |
277 | if (net_ratelimit()) | |
278 | printk("ipv6_conntrack_local: packet too short\n"); | |
279 | return NF_ACCEPT; | |
280 | } | |
281 | return ipv6_conntrack_in(hooknum, pskb, in, out, okfn); | |
282 | } | |
283 | ||
284 | /* Connection tracking may drop packets, but never alters them, so | |
285 | make it the first hook. */ | |
286 | static struct nf_hook_ops ipv6_conntrack_defrag_ops = { | |
287 | .hook = ipv6_defrag, | |
288 | .owner = THIS_MODULE, | |
289 | .pf = PF_INET6, | |
290 | .hooknum = NF_IP6_PRE_ROUTING, | |
291 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
292 | }; | |
293 | ||
294 | static struct nf_hook_ops ipv6_conntrack_in_ops = { | |
295 | .hook = ipv6_conntrack_in, | |
296 | .owner = THIS_MODULE, | |
297 | .pf = PF_INET6, | |
298 | .hooknum = NF_IP6_PRE_ROUTING, | |
299 | .priority = NF_IP6_PRI_CONNTRACK, | |
300 | }; | |
301 | ||
302 | static struct nf_hook_ops ipv6_conntrack_local_out_ops = { | |
303 | .hook = ipv6_conntrack_local, | |
304 | .owner = THIS_MODULE, | |
305 | .pf = PF_INET6, | |
306 | .hooknum = NF_IP6_LOCAL_OUT, | |
307 | .priority = NF_IP6_PRI_CONNTRACK, | |
308 | }; | |
309 | ||
310 | static struct nf_hook_ops ipv6_conntrack_defrag_local_out_ops = { | |
311 | .hook = ipv6_defrag, | |
312 | .owner = THIS_MODULE, | |
313 | .pf = PF_INET6, | |
314 | .hooknum = NF_IP6_LOCAL_OUT, | |
315 | .priority = NF_IP6_PRI_CONNTRACK_DEFRAG, | |
316 | }; | |
317 | ||
318 | /* Refragmenter; last chance. */ | |
319 | static struct nf_hook_ops ipv6_conntrack_out_ops = { | |
320 | .hook = ipv6_confirm, | |
321 | .owner = THIS_MODULE, | |
322 | .pf = PF_INET6, | |
323 | .hooknum = NF_IP6_POST_ROUTING, | |
324 | .priority = NF_IP6_PRI_LAST, | |
325 | }; | |
326 | ||
327 | static struct nf_hook_ops ipv6_conntrack_local_in_ops = { | |
328 | .hook = ipv6_confirm, | |
329 | .owner = THIS_MODULE, | |
330 | .pf = PF_INET6, | |
331 | .hooknum = NF_IP6_LOCAL_IN, | |
332 | .priority = NF_IP6_PRI_LAST-1, | |
333 | }; | |
334 | ||
335 | #ifdef CONFIG_SYSCTL | |
336 | ||
337 | /* From nf_conntrack_proto_icmpv6.c */ | |
babbdb1a | 338 | extern unsigned int nf_ct_icmpv6_timeout; |
9fb9cbb1 YK |
339 | |
340 | /* From nf_conntrack_frag6.c */ | |
babbdb1a | 341 | extern unsigned int nf_ct_frag6_timeout; |
7686a02c YK |
342 | extern unsigned int nf_ct_frag6_low_thresh; |
343 | extern unsigned int nf_ct_frag6_high_thresh; | |
9fb9cbb1 YK |
344 | |
345 | static struct ctl_table_header *nf_ct_ipv6_sysctl_header; | |
346 | ||
347 | static ctl_table nf_ct_sysctl_table[] = { | |
348 | { | |
349 | .ctl_name = NET_NF_CONNTRACK_ICMPV6_TIMEOUT, | |
350 | .procname = "nf_conntrack_icmpv6_timeout", | |
351 | .data = &nf_ct_icmpv6_timeout, | |
352 | .maxlen = sizeof(unsigned int), | |
353 | .mode = 0644, | |
354 | .proc_handler = &proc_dointvec_jiffies, | |
355 | }, | |
356 | { | |
357 | .ctl_name = NET_NF_CONNTRACK_FRAG6_TIMEOUT, | |
358 | .procname = "nf_conntrack_frag6_timeout", | |
359 | .data = &nf_ct_frag6_timeout, | |
360 | .maxlen = sizeof(unsigned int), | |
361 | .mode = 0644, | |
362 | .proc_handler = &proc_dointvec_jiffies, | |
363 | }, | |
364 | { | |
365 | .ctl_name = NET_NF_CONNTRACK_FRAG6_LOW_THRESH, | |
366 | .procname = "nf_conntrack_frag6_low_thresh", | |
367 | .data = &nf_ct_frag6_low_thresh, | |
368 | .maxlen = sizeof(unsigned int), | |
369 | .mode = 0644, | |
7686a02c | 370 | .proc_handler = &proc_dointvec, |
9fb9cbb1 YK |
371 | }, |
372 | { | |
373 | .ctl_name = NET_NF_CONNTRACK_FRAG6_HIGH_THRESH, | |
374 | .procname = "nf_conntrack_frag6_high_thresh", | |
375 | .data = &nf_ct_frag6_high_thresh, | |
376 | .maxlen = sizeof(unsigned int), | |
377 | .mode = 0644, | |
7686a02c | 378 | .proc_handler = &proc_dointvec, |
9fb9cbb1 YK |
379 | }, |
380 | { .ctl_name = 0 } | |
381 | }; | |
382 | ||
383 | static ctl_table nf_ct_netfilter_table[] = { | |
384 | { | |
385 | .ctl_name = NET_NETFILTER, | |
386 | .procname = "netfilter", | |
387 | .mode = 0555, | |
388 | .child = nf_ct_sysctl_table, | |
389 | }, | |
390 | { .ctl_name = 0 } | |
391 | }; | |
392 | ||
393 | static ctl_table nf_ct_net_table[] = { | |
394 | { | |
395 | .ctl_name = CTL_NET, | |
396 | .procname = "net", | |
397 | .mode = 0555, | |
398 | .child = nf_ct_netfilter_table, | |
399 | }, | |
400 | { .ctl_name = 0 } | |
401 | }; | |
402 | #endif | |
403 | ||
c1d10adb PNA |
404 | #if defined(CONFIG_NF_CT_NETLINK) || \ |
405 | defined(CONFIG_NF_CT_NETLINK_MODULE) | |
406 | ||
407 | #include <linux/netfilter/nfnetlink.h> | |
408 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
409 | ||
410 | static int ipv6_tuple_to_nfattr(struct sk_buff *skb, | |
411 | const struct nf_conntrack_tuple *tuple) | |
412 | { | |
413 | NFA_PUT(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4, | |
414 | &tuple->src.u3.ip6); | |
415 | NFA_PUT(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4, | |
416 | &tuple->dst.u3.ip6); | |
417 | return 0; | |
418 | ||
419 | nfattr_failure: | |
420 | return -1; | |
421 | } | |
422 | ||
423 | static const size_t cta_min_ip[CTA_IP_MAX] = { | |
424 | [CTA_IP_V6_SRC-1] = sizeof(u_int32_t)*4, | |
425 | [CTA_IP_V6_DST-1] = sizeof(u_int32_t)*4, | |
426 | }; | |
427 | ||
428 | static int ipv6_nfattr_to_tuple(struct nfattr *tb[], | |
429 | struct nf_conntrack_tuple *t) | |
430 | { | |
431 | if (!tb[CTA_IP_V6_SRC-1] || !tb[CTA_IP_V6_DST-1]) | |
432 | return -EINVAL; | |
433 | ||
434 | if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip)) | |
435 | return -EINVAL; | |
436 | ||
437 | memcpy(&t->src.u3.ip6, NFA_DATA(tb[CTA_IP_V6_SRC-1]), | |
438 | sizeof(u_int32_t) * 4); | |
439 | memcpy(&t->dst.u3.ip6, NFA_DATA(tb[CTA_IP_V6_DST-1]), | |
440 | sizeof(u_int32_t) * 4); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | #endif | |
445 | ||
9fb9cbb1 YK |
446 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 = { |
447 | .l3proto = PF_INET6, | |
448 | .name = "ipv6", | |
449 | .pkt_to_tuple = ipv6_pkt_to_tuple, | |
450 | .invert_tuple = ipv6_invert_tuple, | |
451 | .print_tuple = ipv6_print_tuple, | |
452 | .print_conntrack = ipv6_print_conntrack, | |
453 | .prepare = ipv6_prepare, | |
c1d10adb PNA |
454 | #if defined(CONFIG_NF_CT_NETLINK) || \ |
455 | defined(CONFIG_NF_CT_NETLINK_MODULE) | |
456 | .tuple_to_nfattr = ipv6_tuple_to_nfattr, | |
457 | .nfattr_to_tuple = ipv6_nfattr_to_tuple, | |
458 | #endif | |
9fb9cbb1 YK |
459 | .get_features = ipv6_get_features, |
460 | .me = THIS_MODULE, | |
461 | }; | |
462 | ||
463 | extern struct nf_conntrack_protocol nf_conntrack_protocol_tcp6; | |
464 | extern struct nf_conntrack_protocol nf_conntrack_protocol_udp6; | |
465 | extern struct nf_conntrack_protocol nf_conntrack_protocol_icmpv6; | |
466 | extern int nf_ct_frag6_init(void); | |
467 | extern void nf_ct_frag6_cleanup(void); | |
468 | static int init_or_cleanup(int init) | |
469 | { | |
470 | int ret = 0; | |
471 | ||
472 | if (!init) goto cleanup; | |
473 | ||
474 | ret = nf_ct_frag6_init(); | |
475 | if (ret < 0) { | |
476 | printk("nf_conntrack_ipv6: can't initialize frag6.\n"); | |
477 | goto cleanup_nothing; | |
478 | } | |
479 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_tcp6); | |
480 | if (ret < 0) { | |
481 | printk("nf_conntrack_ipv6: can't register tcp.\n"); | |
482 | goto cleanup_frag6; | |
483 | } | |
484 | ||
485 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_udp6); | |
486 | if (ret < 0) { | |
487 | printk("nf_conntrack_ipv6: can't register udp.\n"); | |
488 | goto cleanup_tcp; | |
489 | } | |
490 | ||
491 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_icmpv6); | |
492 | if (ret < 0) { | |
493 | printk("nf_conntrack_ipv6: can't register icmpv6.\n"); | |
494 | goto cleanup_udp; | |
495 | } | |
496 | ||
497 | ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6); | |
498 | if (ret < 0) { | |
499 | printk("nf_conntrack_ipv6: can't register ipv6\n"); | |
500 | goto cleanup_icmpv6; | |
501 | } | |
502 | ||
503 | ret = nf_register_hook(&ipv6_conntrack_defrag_ops); | |
504 | if (ret < 0) { | |
505 | printk("nf_conntrack_ipv6: can't register pre-routing defrag " | |
506 | "hook.\n"); | |
507 | goto cleanup_ipv6; | |
508 | } | |
509 | ||
510 | ret = nf_register_hook(&ipv6_conntrack_defrag_local_out_ops); | |
511 | if (ret < 0) { | |
512 | printk("nf_conntrack_ipv6: can't register local_out defrag " | |
513 | "hook.\n"); | |
514 | goto cleanup_defragops; | |
515 | } | |
516 | ||
517 | ret = nf_register_hook(&ipv6_conntrack_in_ops); | |
518 | if (ret < 0) { | |
519 | printk("nf_conntrack_ipv6: can't register pre-routing hook.\n"); | |
520 | goto cleanup_defraglocalops; | |
521 | } | |
522 | ||
523 | ret = nf_register_hook(&ipv6_conntrack_local_out_ops); | |
524 | if (ret < 0) { | |
525 | printk("nf_conntrack_ipv6: can't register local out hook.\n"); | |
526 | goto cleanup_inops; | |
527 | } | |
528 | ||
529 | ret = nf_register_hook(&ipv6_conntrack_out_ops); | |
530 | if (ret < 0) { | |
531 | printk("nf_conntrack_ipv6: can't register post-routing hook.\n"); | |
532 | goto cleanup_inandlocalops; | |
533 | } | |
534 | ||
535 | ret = nf_register_hook(&ipv6_conntrack_local_in_ops); | |
536 | if (ret < 0) { | |
537 | printk("nf_conntrack_ipv6: can't register local in hook.\n"); | |
538 | goto cleanup_inoutandlocalops; | |
539 | } | |
540 | ||
541 | #ifdef CONFIG_SYSCTL | |
542 | nf_ct_ipv6_sysctl_header = register_sysctl_table(nf_ct_net_table, 0); | |
543 | if (nf_ct_ipv6_sysctl_header == NULL) { | |
544 | printk("nf_conntrack: can't register to sysctl.\n"); | |
545 | ret = -ENOMEM; | |
546 | goto cleanup_localinops; | |
547 | } | |
548 | #endif | |
549 | return ret; | |
550 | ||
551 | cleanup: | |
552 | synchronize_net(); | |
553 | #ifdef CONFIG_SYSCTL | |
554 | unregister_sysctl_table(nf_ct_ipv6_sysctl_header); | |
555 | cleanup_localinops: | |
556 | #endif | |
557 | nf_unregister_hook(&ipv6_conntrack_local_in_ops); | |
558 | cleanup_inoutandlocalops: | |
559 | nf_unregister_hook(&ipv6_conntrack_out_ops); | |
560 | cleanup_inandlocalops: | |
561 | nf_unregister_hook(&ipv6_conntrack_local_out_ops); | |
562 | cleanup_inops: | |
563 | nf_unregister_hook(&ipv6_conntrack_in_ops); | |
564 | cleanup_defraglocalops: | |
565 | nf_unregister_hook(&ipv6_conntrack_defrag_local_out_ops); | |
566 | cleanup_defragops: | |
567 | nf_unregister_hook(&ipv6_conntrack_defrag_ops); | |
568 | cleanup_ipv6: | |
569 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6); | |
570 | cleanup_icmpv6: | |
571 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_icmpv6); | |
572 | cleanup_udp: | |
573 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_udp6); | |
574 | cleanup_tcp: | |
575 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_tcp6); | |
576 | cleanup_frag6: | |
577 | nf_ct_frag6_cleanup(); | |
578 | cleanup_nothing: | |
579 | return ret; | |
580 | } | |
581 | ||
582 | MODULE_LICENSE("GPL"); | |
583 | MODULE_AUTHOR("Yasuyuki KOZAKAI @USAGI <yasuyuki.kozakai@toshiba.co.jp>"); | |
584 | ||
585 | static int __init init(void) | |
586 | { | |
2e4e6a17 | 587 | need_conntrack(); |
9fb9cbb1 YK |
588 | return init_or_cleanup(1); |
589 | } | |
590 | ||
591 | static void __exit fini(void) | |
592 | { | |
593 | init_or_cleanup(0); | |
594 | } | |
595 | ||
596 | module_init(init); | |
597 | module_exit(fini); |