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 void ipv6_print_tuple(struct seq_file
*s
,
64 const struct nf_conntrack_tuple
*tuple
)
66 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(void *priv
,
100 const struct nf_hook_state
*state
)
103 const struct nf_conn_help
*help
;
104 const struct nf_conntrack_helper
*helper
;
105 enum ip_conntrack_info ctinfo
;
110 /* This is where we call the helper: as the packet goes out. */
111 ct
= nf_ct_get(skb
, &ctinfo
);
112 if (!ct
|| ctinfo
== IP_CT_RELATED_REPLY
)
115 help
= nfct_help(ct
);
118 /* rcu_read_lock()ed by nf_hook_thresh */
119 helper
= rcu_dereference(help
->helper
);
123 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
124 protoff
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
), &nexthdr
,
126 if (protoff
< 0 || (frag_off
& htons(~0x7)) != 0) {
127 pr_debug("proto header not found\n");
131 return helper
->help(skb
, protoff
, ct
, ctinfo
);
134 static unsigned int ipv6_confirm(void *priv
,
136 const struct nf_hook_state
*state
)
139 enum ip_conntrack_info ctinfo
;
140 unsigned char pnum
= ipv6_hdr(skb
)->nexthdr
;
144 ct
= nf_ct_get(skb
, &ctinfo
);
145 if (!ct
|| ctinfo
== IP_CT_RELATED_REPLY
)
148 protoff
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
), &pnum
,
150 if (protoff
< 0 || (frag_off
& htons(~0x7)) != 0) {
151 pr_debug("proto header not found\n");
155 /* adjust seqs for loopback traffic only in outgoing direction */
156 if (test_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
) &&
157 !nf_is_loopback_packet(skb
)) {
158 if (!nf_ct_seq_adjust(skb
, ct
, ctinfo
, protoff
)) {
159 NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct
), drop
);
164 /* We've seen it coming out the other side: confirm it */
165 return nf_conntrack_confirm(skb
);
168 static unsigned int ipv6_conntrack_in(void *priv
,
170 const struct nf_hook_state
*state
)
172 return nf_conntrack_in(state
->net
, PF_INET6
, state
->hook
, skb
);
175 static unsigned int ipv6_conntrack_local(void *priv
,
177 const struct nf_hook_state
*state
)
179 /* root is playing with raw sockets. */
180 if (skb
->len
< sizeof(struct ipv6hdr
)) {
181 net_notice_ratelimited("ipv6_conntrack_local: packet too short\n");
184 return nf_conntrack_in(state
->net
, PF_INET6
, state
->hook
, skb
);
187 static struct nf_hook_ops ipv6_conntrack_ops
[] __read_mostly
= {
189 .hook
= ipv6_conntrack_in
,
191 .hooknum
= NF_INET_PRE_ROUTING
,
192 .priority
= NF_IP6_PRI_CONNTRACK
,
195 .hook
= ipv6_conntrack_local
,
197 .hooknum
= NF_INET_LOCAL_OUT
,
198 .priority
= NF_IP6_PRI_CONNTRACK
,
203 .hooknum
= NF_INET_POST_ROUTING
,
204 .priority
= NF_IP6_PRI_CONNTRACK_HELPER
,
207 .hook
= ipv6_confirm
,
209 .hooknum
= NF_INET_POST_ROUTING
,
210 .priority
= NF_IP6_PRI_LAST
,
215 .hooknum
= NF_INET_LOCAL_IN
,
216 .priority
= NF_IP6_PRI_CONNTRACK_HELPER
,
219 .hook
= ipv6_confirm
,
221 .hooknum
= NF_INET_LOCAL_IN
,
222 .priority
= NF_IP6_PRI_LAST
-1,
227 ipv6_getorigdst(struct sock
*sk
, int optval
, void __user
*user
, int *len
)
229 const struct inet_sock
*inet
= inet_sk(sk
);
230 const struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
231 const struct nf_conntrack_tuple_hash
*h
;
232 struct sockaddr_in6 sin6
;
233 struct nf_conntrack_tuple tuple
= { .src
.l3num
= NFPROTO_IPV6
};
236 tuple
.src
.u3
.in6
= sk
->sk_v6_rcv_saddr
;
237 tuple
.src
.u
.tcp
.port
= inet
->inet_sport
;
238 tuple
.dst
.u3
.in6
= sk
->sk_v6_daddr
;
239 tuple
.dst
.u
.tcp
.port
= inet
->inet_dport
;
240 tuple
.dst
.protonum
= sk
->sk_protocol
;
242 if (sk
->sk_protocol
!= IPPROTO_TCP
&& sk
->sk_protocol
!= IPPROTO_SCTP
)
245 if (*len
< 0 || (unsigned int) *len
< sizeof(sin6
))
248 h
= nf_conntrack_find_get(sock_net(sk
), &nf_ct_zone_dflt
, &tuple
);
250 pr_debug("IP6T_SO_ORIGINAL_DST: Can't find %pI6c/%u-%pI6c/%u.\n",
251 &tuple
.src
.u3
.ip6
, ntohs(tuple
.src
.u
.tcp
.port
),
252 &tuple
.dst
.u3
.ip6
, ntohs(tuple
.dst
.u
.tcp
.port
));
256 ct
= nf_ct_tuplehash_to_ctrack(h
);
258 sin6
.sin6_family
= AF_INET6
;
259 sin6
.sin6_port
= ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.u
.tcp
.port
;
260 sin6
.sin6_flowinfo
= inet6
->flow_label
& IPV6_FLOWINFO_MASK
;
261 memcpy(&sin6
.sin6_addr
,
262 &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.u3
.in6
,
263 sizeof(sin6
.sin6_addr
));
266 sin6
.sin6_scope_id
= ipv6_iface_scope_id(&sin6
.sin6_addr
,
267 sk
->sk_bound_dev_if
);
268 return copy_to_user(user
, &sin6
, sizeof(sin6
)) ? -EFAULT
: 0;
271 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
273 #include <linux/netfilter/nfnetlink.h>
274 #include <linux/netfilter/nfnetlink_conntrack.h>
276 static int ipv6_tuple_to_nlattr(struct sk_buff
*skb
,
277 const struct nf_conntrack_tuple
*tuple
)
279 if (nla_put_in6_addr(skb
, CTA_IP_V6_SRC
, &tuple
->src
.u3
.in6
) ||
280 nla_put_in6_addr(skb
, CTA_IP_V6_DST
, &tuple
->dst
.u3
.in6
))
281 goto nla_put_failure
;
288 static const struct nla_policy ipv6_nla_policy
[CTA_IP_MAX
+1] = {
289 [CTA_IP_V6_SRC
] = { .len
= sizeof(u_int32_t
)*4 },
290 [CTA_IP_V6_DST
] = { .len
= sizeof(u_int32_t
)*4 },
293 static int ipv6_nlattr_to_tuple(struct nlattr
*tb
[],
294 struct nf_conntrack_tuple
*t
)
296 if (!tb
[CTA_IP_V6_SRC
] || !tb
[CTA_IP_V6_DST
])
299 t
->src
.u3
.in6
= nla_get_in6_addr(tb
[CTA_IP_V6_SRC
]);
300 t
->dst
.u3
.in6
= nla_get_in6_addr(tb
[CTA_IP_V6_DST
]);
305 static int ipv6_nlattr_tuple_size(void)
307 return nla_policy_len(ipv6_nla_policy
, CTA_IP_MAX
+ 1);
311 struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 __read_mostly
= {
314 .pkt_to_tuple
= ipv6_pkt_to_tuple
,
315 .invert_tuple
= ipv6_invert_tuple
,
316 .print_tuple
= ipv6_print_tuple
,
317 .get_l4proto
= ipv6_get_l4proto
,
318 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
319 .tuple_to_nlattr
= ipv6_tuple_to_nlattr
,
320 .nlattr_tuple_size
= ipv6_nlattr_tuple_size
,
321 .nlattr_to_tuple
= ipv6_nlattr_to_tuple
,
322 .nla_policy
= ipv6_nla_policy
,
327 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6
));
328 MODULE_LICENSE("GPL");
329 MODULE_AUTHOR("Yasuyuki KOZAKAI @USAGI <yasuyuki.kozakai@toshiba.co.jp>");
331 static struct nf_sockopt_ops so_getorigdst6
= {
333 .get_optmin
= IP6T_SO_ORIGINAL_DST
,
334 .get_optmax
= IP6T_SO_ORIGINAL_DST
+ 1,
335 .get
= ipv6_getorigdst
,
336 .owner
= THIS_MODULE
,
339 static int ipv6_net_init(struct net
*net
)
343 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_tcp6
);
345 pr_err("nf_conntrack_tcp6: pernet registration failed\n");
348 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_udp6
);
350 pr_err("nf_conntrack_udp6: pernet registration failed\n");
353 ret
= nf_ct_l4proto_pernet_register(net
, &nf_conntrack_l4proto_icmpv6
);
355 pr_err("nf_conntrack_icmp6: pernet registration failed\n");
358 ret
= nf_ct_l3proto_pernet_register(net
, &nf_conntrack_l3proto_ipv6
);
360 pr_err("nf_conntrack_ipv6: pernet registration failed.\n");
365 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_icmpv6
);
367 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_udp6
);
369 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_tcp6
);
374 static void ipv6_net_exit(struct net
*net
)
376 nf_ct_l3proto_pernet_unregister(net
, &nf_conntrack_l3proto_ipv6
);
377 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_icmpv6
);
378 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_udp6
);
379 nf_ct_l4proto_pernet_unregister(net
, &nf_conntrack_l4proto_tcp6
);
382 static struct pernet_operations ipv6_net_ops
= {
383 .init
= ipv6_net_init
,
384 .exit
= ipv6_net_exit
,
387 static int __init
nf_conntrack_l3proto_ipv6_init(void)
392 nf_defrag_ipv6_enable();
394 ret
= nf_register_sockopt(&so_getorigdst6
);
396 pr_err("Unable to register netfilter socket option\n");
400 ret
= register_pernet_subsys(&ipv6_net_ops
);
402 goto cleanup_sockopt
;
404 ret
= nf_register_hooks(ipv6_conntrack_ops
,
405 ARRAY_SIZE(ipv6_conntrack_ops
));
407 pr_err("nf_conntrack_ipv6: can't register pre-routing defrag "
412 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp6
);
414 pr_err("nf_conntrack_ipv6: can't register tcp6 proto.\n");
418 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_udp6
);
420 pr_err("nf_conntrack_ipv6: can't register udp6 proto.\n");
424 ret
= nf_ct_l4proto_register(&nf_conntrack_l4proto_icmpv6
);
426 pr_err("nf_conntrack_ipv6: can't register icmpv6 proto.\n");
430 ret
= nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv6
);
432 pr_err("nf_conntrack_ipv6: can't register ipv6 proto.\n");
438 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmpv6
);
440 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp6
);
442 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp6
);
444 nf_unregister_hooks(ipv6_conntrack_ops
, ARRAY_SIZE(ipv6_conntrack_ops
));
446 unregister_pernet_subsys(&ipv6_net_ops
);
448 nf_unregister_sockopt(&so_getorigdst6
);
452 static void __exit
nf_conntrack_l3proto_ipv6_fini(void)
455 nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv6
);
456 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp6
);
457 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp6
);
458 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmpv6
);
459 nf_unregister_hooks(ipv6_conntrack_ops
, ARRAY_SIZE(ipv6_conntrack_ops
));
460 unregister_pernet_subsys(&ipv6_net_ops
);
461 nf_unregister_sockopt(&so_getorigdst6
);
464 module_init(nf_conntrack_l3proto_ipv6_init
);
465 module_exit(nf_conntrack_l3proto_ipv6_fini
);