/*-
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef _LINUXKPI_NET_IPV6_H_
#define _LINUXKPI_NET_IPV6_H_

#include <sys/types.h>
#include <netinet/in.h>
#include <linux/types.h>
#include <linux/bitops.h>

#define IPV6_DEFAULT_HOPLIMIT 64

#define NEXTHDR_HOP             IPPROTO_HOPOPTS
#define NEXTHDR_ROUTING         IPPROTO_ROUTING
#define NEXTHDR_NONE            IPPROTO_NONE
#define NEXTHDR_DEST            IPPROTO_DSTOPTS

#define ipv6_addr_loopback(addr) IN6_IS_ADDR_LOOPBACK(addr)
#define ipv6_addr_any(addr) IN6_IS_ADDR_UNSPECIFIED(addr)

#define ipv6_addr_copy(dst, src)                        \
        memcpy((dst), (src), sizeof(struct in6_addr))

static inline void
ipv6_ib_mc_map(const struct in6_addr *addr, const unsigned char *broadcast,
    char *buf)
{
        unsigned char scope;

        scope = broadcast[5] & 0xF;
        buf[0]  = 0;
        buf[1]  = 0xff;
        buf[2]  = 0xff;
        buf[3]  = 0xff;
        buf[4]  = 0xff;
        buf[5]  = 0x10 | scope;
        buf[6]  = 0x60;
        buf[7]  = 0x1b;
        buf[8]  = broadcast[8];
        buf[9]  = broadcast[9];
        memcpy(&buf[10], &addr->s6_addr[6], 10);
}

static inline void __ipv6_addr_set_half(__be32 *addr, __be32 wh, __be32 wl)
{
#if BITS_PER_LONG == 64
#if defined(__BIG_ENDIAN)
        if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
                *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
                return;
        }
#elif defined(__LITTLE_ENDIAN)
        if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
                *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
                return;
        }
#endif
#endif
        addr[0] = wh;
        addr[1] = wl;
}

static inline void ipv6_addr_set(struct in6_addr *addr,
                                     __be32 w1, __be32 w2,
                                     __be32 w3, __be32 w4)
{
        __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
        __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
}

static inline void ipv6_addr_set_v4mapped(const __be32 addr,
                                          struct in6_addr *v4mapped)
{
        ipv6_addr_set(v4mapped,
                        0, 0,
                        htonl(0x0000FFFF),
                        addr);
}

static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
{
        return ((a->s6_addr32[0] | a->s6_addr32[1] |
                (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
}

static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
{
        return memcmp(a1, a2, sizeof(struct in6_addr));
}

#endif  /* _LINUXKPI_NET_IPV6_H_ */