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#ifndef _LINUXKPI_NET_IPV6_H_
30#define	_LINUXKPI_NET_IPV6_H_
31
32#include <sys/types.h>
33#include <netinet/in.h>
34#include <linux/types.h>
35#include <linux/bitops.h>
36
37#define	IPV6_DEFAULT_HOPLIMIT 64
38
39#define	NEXTHDR_HOP		IPPROTO_HOPOPTS
40#define	NEXTHDR_ROUTING		IPPROTO_ROUTING
41#define	NEXTHDR_NONE		IPPROTO_NONE
42#define	NEXTHDR_DEST		IPPROTO_DSTOPTS
43
44#define	ipv6_addr_loopback(addr) IN6_IS_ADDR_LOOPBACK(addr)
45#define	ipv6_addr_any(addr) IN6_IS_ADDR_UNSPECIFIED(addr)
46
47#define	ipv6_addr_copy(dst, src)			\
48	memcpy((dst), (src), sizeof(struct in6_addr))
49
50static inline void
51ipv6_ib_mc_map(const struct in6_addr *addr, const unsigned char *broadcast,
52    char *buf)
53{
54	unsigned char scope;
55
56	scope = broadcast[5] & 0xF;
57	buf[0]  = 0;
58	buf[1]  = 0xff;
59	buf[2]  = 0xff;
60	buf[3]  = 0xff;
61	buf[4]  = 0xff;
62	buf[5]  = 0x10 | scope;
63	buf[6]  = 0x60;
64	buf[7]  = 0x1b;
65	buf[8]  = broadcast[8];
66	buf[9]  = broadcast[9];
67	memcpy(&buf[10], &addr->s6_addr[6], 10);
68}
69
70static inline void __ipv6_addr_set_half(__be32 *addr, __be32 wh, __be32 wl)
71{
72#if BITS_PER_LONG == 64
73#if defined(__BIG_ENDIAN)
74	if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
75		*(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
76		return;
77	}
78#elif defined(__LITTLE_ENDIAN)
79	if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
80		*(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
81		return;
82	}
83#endif
84#endif
85	addr[0] = wh;
86	addr[1] = wl;
87}
88
89static inline void ipv6_addr_set(struct in6_addr *addr,
90				     __be32 w1, __be32 w2,
91				     __be32 w3, __be32 w4)
92{
93	__ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
94	__ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
95}
96
97static inline void ipv6_addr_set_v4mapped(const __be32 addr,
98					  struct in6_addr *v4mapped)
99{
100	ipv6_addr_set(v4mapped,
101			0, 0,
102			htonl(0x0000FFFF),
103			addr);
104}
105
106static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
107{
108	return ((a->s6_addr32[0] | a->s6_addr32[1] |
109		(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
110}
111
112static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
113{
114	return memcmp(a1, a2, sizeof(struct in6_addr));
115}
116
117#endif	/* _LINUXKPI_NET_IPV6_H_ */
118