2 * Copyright (C)2004 USAGI/WIDE Project
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.
9 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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>
20 #include <net/inet_frag.h>
22 #include <linux/netfilter_bridge.h>
23 #include <linux/netfilter_ipv6.h>
24 #include <linux/netfilter_ipv6/ip6_tables.h>
25 #include <net/netfilter/nf_conntrack.h>
26 #include <net/netfilter/nf_conntrack_helper.h>
27 #include <net/netfilter/nf_conntrack_l4proto.h>
28 #include <net/netfilter/nf_conntrack_l3proto.h>
29 #include <net/netfilter/nf_conntrack_core.h>
30 #include <net/netfilter/nf_conntrack_zones.h>
31 #include <net/netfilter/nf_conntrack_seqadj.h>
32 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
33 #include <net/netfilter/nf_nat_helper.h>
34 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
35 #include <net/netfilter/nf_log.h>
37 static bool ipv6_pkt_to_tuple(const struct sk_buff
*skb
, unsigned int nhoff
,
38 struct nf_conntrack_tuple
*tuple
)
43 ap
= skb_header_pointer(skb
, nhoff
+ offsetof(struct ipv6hdr
, saddr
),
44 sizeof(_addrs
), _addrs
);
48 memcpy(tuple
->src
.u3
.ip6
, ap
, sizeof(tuple
->src
.u3
.ip6
));
49 memcpy(tuple
->dst
.u3
.ip6
, ap
+ 4, sizeof(tuple
->dst
.u3
.ip6
));
54 static bool ipv6_invert_tuple(struct nf_conntrack_tuple
*tuple
,
55 const struct nf_conntrack_tuple
*orig
)
57 memcpy(tuple
->src
.u3
.ip6
, orig
->dst
.u3
.ip6
, sizeof(tuple
->src
.u3
.ip6
));
58 memcpy(tuple
->dst
.u3
.ip6
, orig
->src
.u3
.ip6
, sizeof(tuple
->dst
.u3
.ip6
));
63 static int ipv6_print_tuple(struct seq_file
*s
,
64 const struct nf_conntrack_tuple
*tuple
)
66 return seq_printf(s
, "src=%pI6 dst=%pI6 ",
67 tuple
->src
.u3
.ip6
, tuple
->dst
.u3
.ip6
);
70 static int ipv6_get_l4proto(const struct sk_buff
*skb
, unsigned int nhoff
,
71 unsigned int *dataoff
, u_int8_t
*protonum
)
73 unsigned int extoff
= nhoff
+ sizeof(struct ipv6hdr
);
78 if (skb_copy_bits(skb
, nhoff
+ offsetof(struct ipv6hdr
, nexthdr
),
79 &nexthdr
, sizeof(nexthdr
)) != 0) {
80 pr_debug("ip6_conntrack_core: can't get nexthdr\n");
83 protoff
= ipv6_skip_exthdr(skb
, extoff
, &nexthdr
, &frag_off
);
85 * (protoff == skb->len) means the packet has not data, just
86 * IPv6 and possibly extensions headers, but it is tracked anyway
88 if (protoff
< 0 || (frag_off
& htons(~0x7)) != 0) {
89 pr_debug("ip6_conntrack_core: can't find proto in pkt\n");
98 static unsigned int ipv6_helper(unsigned int hooknum
,
100 const struct net_device
*in
,
101 const struct net_device
*out
,
102 int (*okfn
)(struct sk_buff
*))
105 const struct nf_conn_help
*help
;
106 const struct nf_conntrack_helper
*helper
;
107 enum ip_conntrack_info ctinfo
;
112 /* This is where we call the helper: as the packet goes out. */
113 ct
= nf_ct_get(skb
, &ctinfo
);
114 if (!ct
|| ctinfo
== IP_CT_RELATED_REPLY
)
117 help
= nfct_help(ct
);
120 /* rcu_read_lock()ed by nf_hook_slow */
121 helper
= rcu_dereference(help
->helper
);
125 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
126 protoff
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
), &nexthdr
,
128 if (protoff
< 0 || (frag_off
& htons(~0x7)) != 0) {
129 pr_debug("proto header not found\n");
133 return helper
->help(skb
, protoff
, ct
, ctinfo
);
136 static unsigned int ipv6_confirm(unsigned int hooknum
,
138 const struct net_device
*in
,
139 const struct net_device
*out
,
140 int (*okfn
)(struct sk_buff
*))
143 enum ip_conntrack_info ctinfo
;
144 unsigned char pnum
= ipv6_hdr(skb
)->nexthdr
;
148 ct
= nf_ct_get(skb
, &ctinfo
);
149 if (!ct
|| ctinfo
== IP_CT_RELATED_REPLY
)
152 protoff
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
), &pnum
,
154 if (protoff
< 0 || (frag_off
& htons(~0x7)) != 0) {
155 pr_debug("proto header not found\n");
159 /* adjust seqs for loopback traffic only in outgoing direction */
160 if (test_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
) &&
161 !nf_is_loopback_packet(skb
)) {
162 if (!nf_ct_seq_adjust(skb
, ct
, ctinfo
, protoff
)) {
163 NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct
), drop
);
168 /* We've seen it coming out the other side: confirm it */
169 return nf_conntrack_confirm(skb
);
172 static unsigned int __ipv6_conntrack_in(struct net
*net
,
173 unsigned int hooknum
,
175 const struct net_device
*in
,
176 const struct net_device
*out
,
177 int (*okfn
)(struct sk_buff
*))
179 struct sk_buff
*reasm
= skb
->nfct_reasm
;
180 const struct nf_conn_help
*help
;
182 enum ip_conntrack_info ctinfo
;
184 /* This packet is fragmented and has reassembled packet. */
186 /* Reassembled packet isn't parsed yet ? */
190 ret
= nf_conntrack_in(net
, PF_INET6
, hooknum
, reasm
);
191 if (ret
!= NF_ACCEPT
)
195 /* Conntrack helpers need the entire reassembled packet in the
196 * POST_ROUTING hook. In case of unconfirmed connections NAT
197 * might reassign a helper, so the entire packet is also
200 ct
= nf_ct_get(reasm
, &ctinfo
);
201 if (ct
!= NULL
&& !nf_ct_is_untracked(ct
)) {
202 help
= nfct_help(ct
);
203 if ((help
&& help
->helper
) || !nf_ct_is_confirmed(ct
)) {
204 nf_conntrack_get_reasm(reasm
);
205 NF_HOOK_THRESH(NFPROTO_IPV6
, hooknum
, reasm
,
206 (struct net_device
*)in
,
207 (struct net_device
*)out
,
208 okfn
, NF_IP6_PRI_CONNTRACK
+ 1);
209 return NF_DROP_ERR(-ECANCELED
);
213 nf_conntrack_get(reasm
->nfct
);
214 skb
->nfct
= reasm
->nfct
;
215 skb
->nfctinfo
= reasm
->nfctinfo
;
219 return nf_conntrack_in(net
, PF_INET6
, hooknum
, skb
);
222 static unsigned int ipv6_conntrack_in(unsigned int hooknum
,
224 const struct net_device
*in
,
225 const struct net_device
*out
,
226 int (*okfn
)(struct sk_buff
*))
228 return __ipv6_conntrack_in(dev_net(in
), hooknum
, skb
, in
, out
, okfn
);
231 static unsigned int ipv6_conntrack_local(unsigned int hooknum
,
233 const struct net_device
*in
,
234 const struct net_device
*out
,
235 int (*okfn
)(struct sk_buff
*))
237 /* root is playing with raw sockets. */
238 if (skb
->len
< sizeof(struct ipv6hdr
)) {
239 net_notice_ratelimited("ipv6_conntrack_local: packet too short\n");
242 return __ipv6_conntrack_in(dev_net(out
), hooknum
, skb
, in
, out
, okfn
);
245 static struct nf_hook_ops ipv6_conntrack_ops
[] __read_mostly
= {
247 .hook
= ipv6_conntrack_in
,
248 .owner
= THIS_MODULE
,
250 .hooknum
= NF_INET_PRE_ROUTING
,
251 .priority
= NF_IP6_PRI_CONNTRACK
,
254 .hook
= ipv6_conntrack_local
,
255 .owner
= THIS_MODULE
,
257 .hooknum
= NF_INET_LOCAL_OUT
,
258 .priority
= NF_IP6_PRI_CONNTRACK
,
262 .owner
= THIS_MODULE
,
264 .hooknum
= NF_INET_POST_ROUTING
,
265 .priority
= NF_IP6_PRI_CONNTRACK_HELPER
,
268 .hook
= ipv6_confirm
,
269 .owner
= THIS_MODULE
,
271 .hooknum
= NF_INET_POST_ROUTING
,
272 .priority
= NF_IP6_PRI_LAST
,
276 .owner
= THIS_MODULE
,
278 .hooknum
= NF_INET_LOCAL_IN
,
279 .priority
= NF_IP6_PRI_CONNTRACK_HELPER
,
282 .hook
= ipv6_confirm
,
283 .owner
= THIS_MODULE
,
285 .hooknum
= NF_INET_LOCAL_IN
,
286 .priority
= NF_IP6_PRI_LAST
-1,
291 ipv6_getorigdst(struct sock
*sk
, int optval
, void __user
*user
, int *len
)
293 const struct inet_sock
*inet
= inet_sk(sk
);
294 const struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
295 const struct nf_conntrack_tuple_hash
*h
;
296 struct sockaddr_in6 sin6
;
297 struct nf_conntrack_tuple tuple
= { .src
.l3num
= NFPROTO_IPV6
};
300 tuple
.src
.u3
.in6
= sk
->sk_v6_rcv_saddr
;
301 tuple
.src
.u
.tcp
.port
= inet
->inet_sport
;
302 tuple
.dst
.u3
.in6
= sk
->sk_v6_daddr
;
303 tuple
.dst
.u
.tcp
.port
= inet
->inet_dport
;
304 tuple
.dst
.protonum
= sk
->sk_protocol
;
306 if (sk
->sk_protocol
!= IPPROTO_TCP
&& sk
->sk_protocol
!= IPPROTO_SCTP
)
309 if (*len
< 0 || (unsigned int) *len
< sizeof(sin6
))
312 h
= nf_conntrack_find_get(sock_net(sk
), NF_CT_DEFAULT_ZONE
, &tuple
);
314 pr_debug("IP6T_SO_ORIGINAL_DST: Can't find %pI6c/%u-%pI6c/%u.\n",
315 &tuple
.src
.u3
.ip6
, ntohs(tuple
.src
.u
.tcp
.port
),
316 &tuple
.dst
.u3
.ip6
, ntohs(tuple
.dst
.u
.tcp
.port
));
320 ct
= nf_ct_tuplehash_to_ctrack(h
);
322 sin6
.sin6_family
= AF_INET6
;
323 sin6
.sin6_port
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.u
.tcp
.port
;
324 sin6
.sin6_flowinfo
= inet6
->flow_label
& IPV6_FLOWINFO_MASK
;
325 memcpy(&sin6
.sin6_addr
,
326 &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.u3
.in6
,
327 sizeof(sin6
.sin6_addr
));
330 sin6
.sin6_scope_id
= ipv6_iface_scope_id(&sin6
.sin6_addr
,
331 sk
->sk_bound_dev_if
);
332 return copy_to_user(user
, &sin6
, sizeof(sin6
)) ? -EFAULT
: 0;
335 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
337 #include <linux/netfilter/nfnetlink.h>
338 #include <linux/netfilter/nfnetlink_conntrack.h>
340 static int ipv6_tuple_to_nlattr(struct sk_buff
*skb
,
341 const struct nf_conntrack_tuple
*tuple
)
343 if (nla_put(skb
, CTA_IP_V6_SRC
, sizeof(u_int32_t
) * 4,
344 &tuple
->src
.u3
.ip6
) ||
345 nla_put(skb
, CTA_IP_V6_DST
, sizeof(u_int32_t
) * 4,
347 goto nla_put_failure
;
354 static const struct nla_policy ipv6_nla_policy
[CTA_IP_MAX
+1] = {
355 [CTA_IP_V6_SRC
] = { .len
= sizeof(u_int32_t
)*4 },
356 [CTA_IP_V6_DST
] = { .len
= sizeof(u_int32_t
)*4 },
359 static int ipv6_nlattr_to_tuple(struct nlattr
*tb
[],
360 struct nf_conntrack_tuple
*t
)
362 if (!tb
[CTA_IP_V6_SRC
] || !tb
[CTA_IP_V6_DST
])
365 memcpy(&t
->src
.u3
.ip6
, nla_data(tb
[CTA_IP_V6_SRC
]),
366 sizeof(u_int32_t
) * 4);
367 memcpy(&t
->dst
.u3
.ip6
, nla_data(tb
[CTA_IP_V6_DST
]),
368 sizeof(u_int32_t
) * 4);
373 static int ipv6_nlattr_tuple_size(void)
375 return nla_policy_len(ipv6_nla_policy
, CTA_IP_MAX
+ 1);
379 struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 __read_mostly
= {
382 .pkt_to_tuple
= ipv6_pkt_to_tuple
,
383 .invert_tuple
= ipv6_invert_tuple
,
384 .print_tuple
= ipv6_print_tuple
,
385 .get_l4proto
= ipv6_get_l4proto
,
386 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
387 .tuple_to_nlattr
= ipv6_tuple_to_nlattr
,
388 .nlattr_tuple_size
= ipv6_nlattr_tuple_size
,
389 .nlattr_to_tuple
= ipv6_nlattr_to_tuple
,
390 .nla_policy
= ipv6_nla_policy
,
395 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6
));
396 MODULE_LICENSE("GPL");
397 MODULE_AUTHOR("Yasuyuki KOZAKAI @USAGI <yasuyuki.kozakai@toshiba.co.jp>");
399 static struct nf_sockopt_ops so_getorigdst6
= {
401 .get_optmin
= IP6T_SO_ORIGINAL_DST
,
402 .get_optmax
= IP6T_SO_ORIGINAL_DST
+ 1,
403 .get
= ipv6_getorigdst
,
404 .owner
= THIS_MODULE
,
407 static int ipv6_net_init(struct net
*net
)
411 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_tcp6
);
413 pr_err("nf_conntrack_tcp6: pernet registration failed\n");
416 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_udp6
);
418 pr_err("nf_conntrack_udp6: pernet registration failed\n");
421 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_icmpv6
);
423 pr_err("nf_conntrack_icmp6: pernet registration failed\n");
426 ret
= nf_ct_l3proto_pernet_register(net
, &nf_conntrack_l3proto_ipv6
);
428 pr_err("nf_conntrack_ipv6: pernet registration failed.\n");
433 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_icmpv6
);
435 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_udp6
);
437 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_tcp6
);
442 static void ipv6_net_exit(struct net
*net
)
444 nf_ct_l3proto_pernet_unregister(net
, &nf_conntrack_l3proto_ipv6
);
445 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_icmpv6
);
446 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_udp6
);
447 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_tcp6
);
450 static struct pernet_operations ipv6_net_ops
= {
451 .init
= ipv6_net_init
,
452 .exit
= ipv6_net_exit
,
455 static int __init
nf_conntrack_l3proto_ipv6_init(void)
460 nf_defrag_ipv6_enable();
462 ret
= nf_register_sockopt(&so_getorigdst6
);
464 pr_err("Unable to register netfilter socket option\n");
468 ret
= register_pernet_subsys(&ipv6_net_ops
);
470 goto cleanup_sockopt
;
472 ret
= nf_register_hooks(ipv6_conntrack_ops
,
473 ARRAY_SIZE(ipv6_conntrack_ops
));
475 pr_err("nf_conntrack_ipv6: can't register pre-routing defrag "
480 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp6
);
482 pr_err("nf_conntrack_ipv6: can't register tcp6 proto.\n");
486 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_udp6
);
488 pr_err("nf_conntrack_ipv6: can't register udp6 proto.\n");
492 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_icmpv6
);
494 pr_err("nf_conntrack_ipv6: can't register icmpv6 proto.\n");
498 ret
= nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv6
);
500 pr_err("nf_conntrack_ipv6: can't register ipv6 proto.\n");
506 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmpv6
);
508 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp6
);
510 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp6
);
512 nf_unregister_hooks(ipv6_conntrack_ops
, ARRAY_SIZE(ipv6_conntrack_ops
));
514 unregister_pernet_subsys(&ipv6_net_ops
);
516 nf_unregister_sockopt(&so_getorigdst6
);
520 static void __exit
nf_conntrack_l3proto_ipv6_fini(void)
523 nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv6
);
524 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp6
);
525 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp6
);
526 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmpv6
);
527 nf_unregister_hooks(ipv6_conntrack_ops
, ARRAY_SIZE(ipv6_conntrack_ops
));
528 unregister_pernet_subsys(&ipv6_net_ops
);
529 nf_unregister_sockopt(&so_getorigdst6
);
532 module_init(nf_conntrack_l3proto_ipv6_init
);
533 module_exit(nf_conntrack_l3proto_ipv6_fini
);