ipv6.h revision 271127 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#ifndef _LINUX_NET_IPV6_H_
31#define	_LINUX_NET_IPV6_H_
32
33#include "opt_inet6.h"
34
35#define	ipv6_addr_loopback IN6_IS_ADDR_LOOPBACK
36#define	ipv6_addr_copy(dst, src)					\
37	memcpy((dst), (src), sizeof(struct in6_addr))
38
39#ifdef INET6
40static inline void
41ipv6_ib_mc_map(const struct in6_addr *addr, const unsigned char *broadcast,
42    char *buf)
43{
44	unsigned char scope;
45
46	scope = broadcast[5] & 0xF;
47	buf[0]  = 0;
48	buf[1]  = 0xff;
49	buf[2]  = 0xff;
50	buf[3]  = 0xff;
51	buf[4]  = 0xff;
52	buf[5]  = 0x10 | scope;
53	buf[6]  = 0x60;
54	buf[7]  = 0x1b;
55	buf[8]  = broadcast[8];
56	buf[9]  = broadcast[9];
57	memcpy(&buf[10], &addr->s6_addr[6], 10);
58}
59#endif
60
61static inline void __ipv6_addr_set_half(__be32 *addr,
62                                        __be32 wh, __be32 wl)
63{
64#if BITS_PER_LONG == 64
65#if defined(__BIG_ENDIAN)
66        if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
67                *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
68                return;
69        }
70#elif defined(__LITTLE_ENDIAN)
71        if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
72                *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
73                return;
74        }
75#endif
76#endif
77        addr[0] = wh;
78        addr[1] = wl;
79}
80
81static inline void ipv6_addr_set(struct in6_addr *addr,
82                                     __be32 w1, __be32 w2,
83                                     __be32 w3, __be32 w4)
84{
85        __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
86        __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
87}
88
89static inline void ipv6_addr_set_v4mapped(const __be32 addr,
90					  struct in6_addr *v4mapped)
91{
92	ipv6_addr_set(v4mapped,
93			0, 0,
94			htonl(0x0000FFFF),
95			addr);
96}
97
98static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
99{
100	return ((a->s6_addr32[0] | a->s6_addr32[1] |
101		(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
102}
103
104static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
105{
106        return memcmp(a1, a2, sizeof(struct in6_addr));
107}
108
109
110#endif	/* _LINUX_NET_IPV6_H_ */
111