]>
Commit | Line | Data |
---|---|---|
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> | |
9fb9cbb1 YK |
10 | */ |
11 | ||
9fb9cbb1 YK |
12 | #include <linux/types.h> |
13 | #include <linux/ipv6.h> | |
14 | #include <linux/in6.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/icmp.h> | |
9fb9cbb1 | 19 | #include <net/ipv6.h> |
04128f23 | 20 | #include <net/inet_frag.h> |
9fb9cbb1 | 21 | |
8fa9ff68 | 22 | #include <linux/netfilter_bridge.h> |
9fb9cbb1 YK |
23 | #include <linux/netfilter_ipv6.h> |
24 | #include <net/netfilter/nf_conntrack.h> | |
25 | #include <net/netfilter/nf_conntrack_helper.h> | |
605dcad6 | 26 | #include <net/netfilter/nf_conntrack_l4proto.h> |
9fb9cbb1 YK |
27 | #include <net/netfilter/nf_conntrack_l3proto.h> |
28 | #include <net/netfilter/nf_conntrack_core.h> | |
5d0aa2cc | 29 | #include <net/netfilter/nf_conntrack_zones.h> |
9d2493f8 | 30 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
e97c3e27 | 31 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
74f7a655 | 32 | #include <net/netfilter/nf_log.h> |
9fb9cbb1 | 33 | |
8ce8439a JE |
34 | static bool ipv6_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, |
35 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 36 | { |
32948588 JE |
37 | const u_int32_t *ap; |
38 | u_int32_t _addrs[8]; | |
9fb9cbb1 YK |
39 | |
40 | ap = skb_header_pointer(skb, nhoff + offsetof(struct ipv6hdr, saddr), | |
41 | sizeof(_addrs), _addrs); | |
42 | if (ap == NULL) | |
8ce8439a | 43 | return false; |
9fb9cbb1 YK |
44 | |
45 | memcpy(tuple->src.u3.ip6, ap, sizeof(tuple->src.u3.ip6)); | |
46 | memcpy(tuple->dst.u3.ip6, ap + 4, sizeof(tuple->dst.u3.ip6)); | |
47 | ||
8ce8439a | 48 | return true; |
9fb9cbb1 YK |
49 | } |
50 | ||
8ce8439a JE |
51 | static bool ipv6_invert_tuple(struct nf_conntrack_tuple *tuple, |
52 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 YK |
53 | { |
54 | memcpy(tuple->src.u3.ip6, orig->dst.u3.ip6, sizeof(tuple->src.u3.ip6)); | |
55 | memcpy(tuple->dst.u3.ip6, orig->src.u3.ip6, sizeof(tuple->dst.u3.ip6)); | |
56 | ||
8ce8439a | 57 | return true; |
9fb9cbb1 YK |
58 | } |
59 | ||
60 | static int ipv6_print_tuple(struct seq_file *s, | |
61 | const struct nf_conntrack_tuple *tuple) | |
62 | { | |
5b095d98 | 63 | return seq_printf(s, "src=%pI6 dst=%pI6 ", |
0c6ce78a | 64 | tuple->src.u3.ip6, tuple->dst.u3.ip6); |
9fb9cbb1 YK |
65 | } |
66 | ||
9fb9cbb1 YK |
67 | /* |
68 | * Based on ipv6_skip_exthdr() in net/ipv6/exthdr.c | |
69 | * | |
70 | * This function parses (probably truncated) exthdr set "hdr" | |
71 | * of length "len". "nexthdrp" initially points to some place, | |
72 | * where type of the first header can be found. | |
73 | * | |
74 | * It skips all well-known exthdrs, and returns pointer to the start | |
75 | * of unparsable area i.e. the first header with unknown type. | |
76 | * if success, *nexthdr is updated by type/protocol of this header. | |
77 | * | |
78 | * NOTES: - it may return pointer pointing beyond end of packet, | |
79 | * if the last recognized header is truncated in the middle. | |
80 | * - if packet is truncated, so that all parsed headers are skipped, | |
81 | * it returns -1. | |
82 | * - if packet is fragmented, return pointer of the fragment header. | |
83 | * - ESP is unparsable for now and considered like | |
84 | * normal payload protocol. | |
85 | * - Note also special handling of AUTH header. Thanks to IPsec wizards. | |
86 | */ | |
87 | ||
1a3a206f AB |
88 | static int nf_ct_ipv6_skip_exthdr(const struct sk_buff *skb, int start, |
89 | u8 *nexthdrp, int len) | |
9fb9cbb1 YK |
90 | { |
91 | u8 nexthdr = *nexthdrp; | |
92 | ||
93 | while (ipv6_ext_hdr(nexthdr)) { | |
94 | struct ipv6_opt_hdr hdr; | |
95 | int hdrlen; | |
96 | ||
97 | if (len < (int)sizeof(struct ipv6_opt_hdr)) | |
98 | return -1; | |
99 | if (nexthdr == NEXTHDR_NONE) | |
100 | break; | |
101 | if (nexthdr == NEXTHDR_FRAGMENT) | |
102 | break; | |
103 | if (skb_copy_bits(skb, start, &hdr, sizeof(hdr))) | |
104 | BUG(); | |
105 | if (nexthdr == NEXTHDR_AUTH) | |
106 | hdrlen = (hdr.hdrlen+2)<<2; | |
107 | else | |
108 | hdrlen = ipv6_optlen(&hdr); | |
109 | ||
110 | nexthdr = hdr.nexthdr; | |
111 | len -= hdrlen; | |
112 | start += hdrlen; | |
113 | } | |
114 | ||
115 | *nexthdrp = nexthdr; | |
116 | return start; | |
117 | } | |
118 | ||
ffc30690 YK |
119 | static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, |
120 | unsigned int *dataoff, u_int8_t *protonum) | |
9fb9cbb1 | 121 | { |
ffc30690 YK |
122 | unsigned int extoff = nhoff + sizeof(struct ipv6hdr); |
123 | unsigned char pnum; | |
124 | int protoff; | |
125 | ||
126 | if (skb_copy_bits(skb, nhoff + offsetof(struct ipv6hdr, nexthdr), | |
127 | &pnum, sizeof(pnum)) != 0) { | |
128 | pr_debug("ip6_conntrack_core: can't get nexthdr\n"); | |
129 | return -NF_ACCEPT; | |
130 | } | |
131 | protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum, skb->len - extoff); | |
9fb9cbb1 | 132 | /* |
ffc30690 | 133 | * (protoff == skb->len) mean that the packet doesn't have no data |
9fb9cbb1 YK |
134 | * except of IPv6 & ext headers. but it's tracked anyway. - YK |
135 | */ | |
ffc30690 | 136 | if ((protoff < 0) || (protoff > skb->len)) { |
0d53778e | 137 | pr_debug("ip6_conntrack_core: can't find proto in pkt\n"); |
9fb9cbb1 YK |
138 | return -NF_ACCEPT; |
139 | } | |
140 | ||
141 | *dataoff = protoff; | |
142 | *protonum = pnum; | |
143 | return NF_ACCEPT; | |
144 | } | |
145 | ||
9fb9cbb1 | 146 | static unsigned int ipv6_confirm(unsigned int hooknum, |
3db05fea | 147 | struct sk_buff *skb, |
9fb9cbb1 YK |
148 | const struct net_device *in, |
149 | const struct net_device *out, | |
150 | int (*okfn)(struct sk_buff *)) | |
151 | { | |
152 | struct nf_conn *ct; | |
32948588 JE |
153 | const struct nf_conn_help *help; |
154 | const struct nf_conntrack_helper *helper; | |
9fb9cbb1 | 155 | enum ip_conntrack_info ctinfo; |
dc808fe2 | 156 | unsigned int ret, protoff; |
3db05fea HX |
157 | unsigned int extoff = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
158 | unsigned char pnum = ipv6_hdr(skb)->nexthdr; | |
dc808fe2 | 159 | |
9fb9cbb1 YK |
160 | |
161 | /* This is where we call the helper: as the packet goes out. */ | |
3db05fea | 162 | ct = nf_ct_get(skb, &ctinfo); |
6442f1cf | 163 | if (!ct || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY) |
dc808fe2 HW |
164 | goto out; |
165 | ||
166 | help = nfct_help(ct); | |
3c158f7f PM |
167 | if (!help) |
168 | goto out; | |
169 | /* rcu_read_lock()ed by nf_hook_slow */ | |
170 | helper = rcu_dereference(help->helper); | |
171 | if (!helper) | |
dc808fe2 HW |
172 | goto out; |
173 | ||
3db05fea HX |
174 | protoff = nf_ct_ipv6_skip_exthdr(skb, extoff, &pnum, |
175 | skb->len - extoff); | |
176 | if (protoff > skb->len || pnum == NEXTHDR_FRAGMENT) { | |
0d53778e | 177 | pr_debug("proto header not found\n"); |
dc808fe2 | 178 | return NF_ACCEPT; |
9fb9cbb1 YK |
179 | } |
180 | ||
3db05fea | 181 | ret = helper->help(skb, protoff, ct, ctinfo); |
74f7a655 PM |
182 | if (ret != NF_ACCEPT) { |
183 | nf_log_packet(NFPROTO_IPV6, hooknum, skb, in, out, NULL, | |
184 | "nf_ct_%s: dropping packet", helper->name); | |
dc808fe2 | 185 | return ret; |
74f7a655 | 186 | } |
dc808fe2 | 187 | out: |
9fb9cbb1 | 188 | /* We've seen it coming out the other side: confirm it */ |
3db05fea | 189 | return nf_conntrack_confirm(skb); |
9fb9cbb1 YK |
190 | } |
191 | ||
a702a65f AD |
192 | static unsigned int __ipv6_conntrack_in(struct net *net, |
193 | unsigned int hooknum, | |
194 | struct sk_buff *skb, | |
195 | int (*okfn)(struct sk_buff *)) | |
9fb9cbb1 | 196 | { |
3db05fea | 197 | struct sk_buff *reasm = skb->nfct_reasm; |
9fb9cbb1 YK |
198 | |
199 | /* This packet is fragmented and has reassembled packet. */ | |
200 | if (reasm) { | |
201 | /* Reassembled packet isn't parsed yet ? */ | |
202 | if (!reasm->nfct) { | |
203 | unsigned int ret; | |
204 | ||
a702a65f | 205 | ret = nf_conntrack_in(net, PF_INET6, hooknum, reasm); |
9fb9cbb1 YK |
206 | if (ret != NF_ACCEPT) |
207 | return ret; | |
208 | } | |
209 | nf_conntrack_get(reasm->nfct); | |
3db05fea HX |
210 | skb->nfct = reasm->nfct; |
211 | skb->nfctinfo = reasm->nfctinfo; | |
9fb9cbb1 YK |
212 | return NF_ACCEPT; |
213 | } | |
214 | ||
a702a65f AD |
215 | return nf_conntrack_in(net, PF_INET6, hooknum, skb); |
216 | } | |
217 | ||
218 | static unsigned int ipv6_conntrack_in(unsigned int hooknum, | |
219 | struct sk_buff *skb, | |
220 | const struct net_device *in, | |
221 | const struct net_device *out, | |
222 | int (*okfn)(struct sk_buff *)) | |
223 | { | |
224 | return __ipv6_conntrack_in(dev_net(in), hooknum, skb, okfn); | |
9fb9cbb1 YK |
225 | } |
226 | ||
227 | static unsigned int ipv6_conntrack_local(unsigned int hooknum, | |
3db05fea | 228 | struct sk_buff *skb, |
9fb9cbb1 YK |
229 | const struct net_device *in, |
230 | const struct net_device *out, | |
231 | int (*okfn)(struct sk_buff *)) | |
232 | { | |
233 | /* root is playing with raw sockets. */ | |
3db05fea | 234 | if (skb->len < sizeof(struct ipv6hdr)) { |
9fb9cbb1 | 235 | if (net_ratelimit()) |
654d0fbd | 236 | pr_notice("ipv6_conntrack_local: packet too short\n"); |
9fb9cbb1 YK |
237 | return NF_ACCEPT; |
238 | } | |
a702a65f | 239 | return __ipv6_conntrack_in(dev_net(out), hooknum, skb, okfn); |
9fb9cbb1 YK |
240 | } |
241 | ||
1999414a | 242 | static struct nf_hook_ops ipv6_conntrack_ops[] __read_mostly = { |
964ddaa1 PM |
243 | { |
244 | .hook = ipv6_conntrack_in, | |
245 | .owner = THIS_MODULE, | |
57750a22 | 246 | .pf = NFPROTO_IPV6, |
6e23ae2a | 247 | .hooknum = NF_INET_PRE_ROUTING, |
964ddaa1 PM |
248 | .priority = NF_IP6_PRI_CONNTRACK, |
249 | }, | |
250 | { | |
251 | .hook = ipv6_conntrack_local, | |
252 | .owner = THIS_MODULE, | |
57750a22 | 253 | .pf = NFPROTO_IPV6, |
6e23ae2a | 254 | .hooknum = NF_INET_LOCAL_OUT, |
964ddaa1 PM |
255 | .priority = NF_IP6_PRI_CONNTRACK, |
256 | }, | |
964ddaa1 PM |
257 | { |
258 | .hook = ipv6_confirm, | |
259 | .owner = THIS_MODULE, | |
57750a22 | 260 | .pf = NFPROTO_IPV6, |
6e23ae2a | 261 | .hooknum = NF_INET_POST_ROUTING, |
964ddaa1 PM |
262 | .priority = NF_IP6_PRI_LAST, |
263 | }, | |
264 | { | |
265 | .hook = ipv6_confirm, | |
266 | .owner = THIS_MODULE, | |
57750a22 | 267 | .pf = NFPROTO_IPV6, |
6e23ae2a | 268 | .hooknum = NF_INET_LOCAL_IN, |
964ddaa1 PM |
269 | .priority = NF_IP6_PRI_LAST-1, |
270 | }, | |
9fb9cbb1 YK |
271 | }; |
272 | ||
e281db5c | 273 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
c1d10adb PNA |
274 | |
275 | #include <linux/netfilter/nfnetlink.h> | |
276 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
277 | ||
fdf70832 | 278 | static int ipv6_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb PNA |
279 | const struct nf_conntrack_tuple *tuple) |
280 | { | |
df6fb868 | 281 | NLA_PUT(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4, |
c1d10adb | 282 | &tuple->src.u3.ip6); |
df6fb868 | 283 | NLA_PUT(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4, |
c1d10adb PNA |
284 | &tuple->dst.u3.ip6); |
285 | return 0; | |
286 | ||
df6fb868 | 287 | nla_put_failure: |
c1d10adb PNA |
288 | return -1; |
289 | } | |
290 | ||
f73e924c PM |
291 | static const struct nla_policy ipv6_nla_policy[CTA_IP_MAX+1] = { |
292 | [CTA_IP_V6_SRC] = { .len = sizeof(u_int32_t)*4 }, | |
293 | [CTA_IP_V6_DST] = { .len = sizeof(u_int32_t)*4 }, | |
c1d10adb PNA |
294 | }; |
295 | ||
fdf70832 | 296 | static int ipv6_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb PNA |
297 | struct nf_conntrack_tuple *t) |
298 | { | |
df6fb868 | 299 | if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST]) |
c1d10adb PNA |
300 | return -EINVAL; |
301 | ||
df6fb868 | 302 | memcpy(&t->src.u3.ip6, nla_data(tb[CTA_IP_V6_SRC]), |
c1d10adb | 303 | sizeof(u_int32_t) * 4); |
df6fb868 | 304 | memcpy(&t->dst.u3.ip6, nla_data(tb[CTA_IP_V6_DST]), |
c1d10adb PNA |
305 | sizeof(u_int32_t) * 4); |
306 | ||
307 | return 0; | |
308 | } | |
a400c30e HE |
309 | |
310 | static int ipv6_nlattr_tuple_size(void) | |
311 | { | |
312 | return nla_policy_len(ipv6_nla_policy, CTA_IP_MAX + 1); | |
313 | } | |
c1d10adb PNA |
314 | #endif |
315 | ||
61075af5 | 316 | struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 __read_mostly = { |
9fb9cbb1 YK |
317 | .l3proto = PF_INET6, |
318 | .name = "ipv6", | |
319 | .pkt_to_tuple = ipv6_pkt_to_tuple, | |
320 | .invert_tuple = ipv6_invert_tuple, | |
321 | .print_tuple = ipv6_print_tuple, | |
ffc30690 | 322 | .get_l4proto = ipv6_get_l4proto, |
e281db5c | 323 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
fdf70832 | 324 | .tuple_to_nlattr = ipv6_tuple_to_nlattr, |
a400c30e | 325 | .nlattr_tuple_size = ipv6_nlattr_tuple_size, |
fdf70832 | 326 | .nlattr_to_tuple = ipv6_nlattr_to_tuple, |
f73e924c | 327 | .nla_policy = ipv6_nla_policy, |
c1d10adb | 328 | #endif |
9fb9cbb1 YK |
329 | .me = THIS_MODULE, |
330 | }; | |
331 | ||
32292a7f PM |
332 | MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6)); |
333 | MODULE_LICENSE("GPL"); | |
334 | MODULE_AUTHOR("Yasuyuki KOZAKAI @USAGI <yasuyuki.kozakai@toshiba.co.jp>"); | |
335 | ||
336 | static int __init nf_conntrack_l3proto_ipv6_init(void) | |
9fb9cbb1 YK |
337 | { |
338 | int ret = 0; | |
339 | ||
32292a7f | 340 | need_conntrack(); |
e97c3e27 | 341 | nf_defrag_ipv6_enable(); |
9fb9cbb1 | 342 | |
605dcad6 | 343 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp6); |
9fb9cbb1 | 344 | if (ret < 0) { |
654d0fbd | 345 | pr_err("nf_conntrack_ipv6: can't register tcp.\n"); |
e97c3e27 | 346 | return ret; |
9fb9cbb1 YK |
347 | } |
348 | ||
605dcad6 | 349 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp6); |
9fb9cbb1 | 350 | if (ret < 0) { |
654d0fbd | 351 | pr_err("nf_conntrack_ipv6: can't register udp.\n"); |
9fb9cbb1 YK |
352 | goto cleanup_tcp; |
353 | } | |
354 | ||
605dcad6 | 355 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmpv6); |
9fb9cbb1 | 356 | if (ret < 0) { |
654d0fbd | 357 | pr_err("nf_conntrack_ipv6: can't register icmpv6.\n"); |
9fb9cbb1 YK |
358 | goto cleanup_udp; |
359 | } | |
360 | ||
361 | ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6); | |
362 | if (ret < 0) { | |
654d0fbd | 363 | pr_err("nf_conntrack_ipv6: can't register ipv6\n"); |
9fb9cbb1 YK |
364 | goto cleanup_icmpv6; |
365 | } | |
366 | ||
964ddaa1 PM |
367 | ret = nf_register_hooks(ipv6_conntrack_ops, |
368 | ARRAY_SIZE(ipv6_conntrack_ops)); | |
9fb9cbb1 | 369 | if (ret < 0) { |
654d0fbd | 370 | pr_err("nf_conntrack_ipv6: can't register pre-routing defrag " |
9fb9cbb1 YK |
371 | "hook.\n"); |
372 | goto cleanup_ipv6; | |
373 | } | |
9fb9cbb1 YK |
374 | return ret; |
375 | ||
9fb9cbb1 YK |
376 | cleanup_ipv6: |
377 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6); | |
378 | cleanup_icmpv6: | |
605dcad6 | 379 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmpv6); |
9fb9cbb1 | 380 | cleanup_udp: |
605dcad6 | 381 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp6); |
9fb9cbb1 | 382 | cleanup_tcp: |
605dcad6 | 383 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp6); |
9fb9cbb1 YK |
384 | return ret; |
385 | } | |
386 | ||
65b4b4e8 | 387 | static void __exit nf_conntrack_l3proto_ipv6_fini(void) |
9fb9cbb1 | 388 | { |
32292a7f | 389 | synchronize_net(); |
32292a7f PM |
390 | nf_unregister_hooks(ipv6_conntrack_ops, ARRAY_SIZE(ipv6_conntrack_ops)); |
391 | nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6); | |
605dcad6 MJ |
392 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmpv6); |
393 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp6); | |
394 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp6); | |
9fb9cbb1 YK |
395 | } |
396 | ||
65b4b4e8 AM |
397 | module_init(nf_conntrack_l3proto_ipv6_init); |
398 | module_exit(nf_conntrack_l3proto_ipv6_fini); |