xref: /freebsd/sys/netpfil/ipfw/nat64/nat64_translate.h (revision 4f52dfbb8d6c4d446500c5b097e3806ec219fbd4)
1 /*-
2  * Copyright (c) 2015-2016 Yandex LLC
3  * Copyright (c) 2015-2016 Andrey V. Elsukov <ae@FreeBSD.org>
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29 
30 #ifndef	_IP_FW_NAT64_TRANSLATE_H_
31 #define	_IP_FW_NAT64_TRANSLATE_H_
32 
33 static inline int
34 nat64_check_ip6(struct in6_addr *addr)
35 {
36 
37 	/* XXX: We should really check /8 */
38 	if (addr->s6_addr16[0] == 0 || /* 0000::/8 Reserved by IETF */
39 	    IN6_IS_ADDR_MULTICAST(addr) || IN6_IS_ADDR_LINKLOCAL(addr))
40 		return (1);
41 	return (0);
42 }
43 
44 extern int nat64_allow_private;
45 static inline int
46 nat64_check_private_ip4(in_addr_t ia)
47 {
48 
49 	if (nat64_allow_private)
50 		return (0);
51 	/* WKPFX must not be used to represent non-global IPv4 addresses */
52 //	if (cfg->flags & NAT64_WKPFX) {
53 		/* IN_PRIVATE */
54 		if ((ia & htonl(0xff000000)) == htonl(0x0a000000) ||
55 		    (ia & htonl(0xfff00000)) == htonl(0xac100000) ||
56 		    (ia & htonl(0xffff0000)) == htonl(0xc0a80000))
57 			return (1);
58 		/*
59 		 * RFC 5735:
60 		 *  192.0.0.0/24 - reserved for IETF protocol assignments
61 		 *  192.88.99.0/24 - for use as 6to4 relay anycast addresses
62 		 *  198.18.0.0/15 - for use in benchmark tests
63 		 *  192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24 - for use
64 		 *   in documentation and example code
65 		 */
66 		if ((ia & htonl(0xffffff00)) == htonl(0xc0000000) ||
67 		    (ia & htonl(0xffffff00)) == htonl(0xc0586300) ||
68 		    (ia & htonl(0xfffffe00)) == htonl(0xc6120000) ||
69 		    (ia & htonl(0xffffff00)) == htonl(0xc0000200) ||
70 		    (ia & htonl(0xfffffe00)) == htonl(0xc6336400) ||
71 		    (ia & htonl(0xffffff00)) == htonl(0xcb007100))
72 			return (1);
73 //	}
74 	return (0);
75 }
76 
77 static inline int
78 nat64_check_ip4(in_addr_t ia)
79 {
80 
81 	/* IN_LOOPBACK */
82 	if ((ia & htonl(0xff000000)) == htonl(0x7f000000))
83 		return (1);
84 	/* IN_LINKLOCAL */
85 	if ((ia & htonl(0xffff0000)) == htonl(0xa9fe0000))
86 		return (1);
87 	/* IN_MULTICAST & IN_EXPERIMENTAL */
88 	if ((ia & htonl(0xe0000000)) == htonl(0xe0000000))
89 		return (1);
90 	return (0);
91 }
92 
93 #define	nat64_get_ip4(_ip6)		((_ip6)->s6_addr32[3])
94 #define	nat64_set_ip4(_ip6, _ip4)	(_ip6)->s6_addr32[3] = (_ip4)
95 
96 int nat64_getlasthdr(struct mbuf *m, int *offset);
97 int nat64_do_handle_ip4(struct mbuf *m, struct in6_addr *saddr,
98     struct in6_addr *daddr, uint16_t lport, nat64_stats_block *stats,
99     void *logdata);
100 int nat64_do_handle_ip6(struct mbuf *m, uint32_t aaddr, uint16_t aport,
101     nat64_stats_block *stats, void *logdata);
102 int nat64_handle_icmp6(struct mbuf *m, int hlen, uint32_t aaddr, uint16_t aport,
103     nat64_stats_block *stats, void *logdata);
104 
105 #endif
106 
107