nat64_translate.h revision 332766 
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: stable/11/sys/netpfil/ipfw/nat64/nat64_translate.h 332766 2018-04-19 10:13:28Z ae $
28 */
29
30#ifndef	_IP_FW_NAT64_TRANSLATE_H_
31#define	_IP_FW_NAT64_TRANSLATE_H_
32
33static inline int
34nat64_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
44extern int nat64_allow_private;
45static inline int
46nat64_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
77static inline int
78nat64_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
96int nat64_getlasthdr(struct mbuf *m, int *offset);
97int 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);
100int nat64_do_handle_ip6(struct mbuf *m, uint32_t aaddr, uint16_t aport,
101    nat64_stats_block *stats, void *logdata);
102int 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