/**
 * @file
 *
 * IPv6 addresses.
 */

/*
 * Copyright (c) 2010 Inico 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,
 *    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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission. 
 *
 * 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.
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author: Ivan Delamer <delamer@inicotech.com>
 *
 * Structs and macros for handling IPv6 addresses.
 *
 * Please coordinate changes and requests with Ivan Delamer
 * <delamer@inicotech.com>
 */
#ifndef LWIP_HDR_IP6_ADDR_H
#define LWIP_HDR_IP6_ADDR_H

#include "lwip/opt.h"

#if LWIP_IPV6  /* don't build if not configured for use in lwipopts.h */


#ifdef __cplusplus
extern "C" {
#endif


/* This is the aligned version of ip6_addr_t,
   used as local variable, on the stack, etc. */
struct ip6_addr {
  u32_t addr[4];
};

/* This is the packed version of ip6_addr_t,
   used in network headers that are itself packed */
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct ip6_addr_packed {
  PACK_STRUCT_FIELD(u32_t addr[4]);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/epstruct.h"
#endif

/** ip6_addr_t uses a struct for convenience only, so that the same defines can
 * operate both on ip6_addr_t as well as on ip6_addr_p_t. */
typedef struct ip6_addr ip6_addr_t;
typedef struct ip6_addr_packed ip6_addr_p_t;


/** IP6_ADDR_ANY can be used as a fixed IPv6 address
 *  for the wildcard
 */
extern const ip6_addr_t ip6_addr_any;
#define IP6_ADDR_ANY         ((ip6_addr_t *)&ip6_addr_any)


#if BYTE_ORDER == BIG_ENDIAN
/** Set an IPv6 partial address given by byte-parts. */
#define IP6_ADDR(ip6addr, index, a,b,c,d) \
  (ip6addr)->addr[index] = ((u32_t)((a) & 0xff) << 24) | \
                           ((u32_t)((b) & 0xff) << 16) | \
                           ((u32_t)((c) & 0xff) << 8)  | \
                            (u32_t)((d) & 0xff)
#else
/** Set an IPv6 partial address given by byte-parts.
Little-endian version, stored in network order (no htonl). */
#define IP6_ADDR(ip6addr, index, a,b,c,d) \
  (ip6addr)->addr[index] = ((u32_t)((d) & 0xff) << 24) | \
                           ((u32_t)((c) & 0xff) << 16) | \
                           ((u32_t)((b) & 0xff) << 8)  | \
                            (u32_t)((a) & 0xff)
#endif

/** Access address in 16-bit block */
#define IP6_ADDR_BLOCK1(ip6addr) ((u16_t)(htonl((ip6addr)->addr[0]) >> 16) & 0xffff)
#define IP6_ADDR_BLOCK2(ip6addr) ((u16_t)(htonl((ip6addr)->addr[0])) & 0xffff)
#define IP6_ADDR_BLOCK3(ip6addr) ((u16_t)(htonl((ip6addr)->addr[1]) >> 16) & 0xffff)
#define IP6_ADDR_BLOCK4(ip6addr) ((u16_t)(htonl((ip6addr)->addr[1])) & 0xffff)
#define IP6_ADDR_BLOCK5(ip6addr) ((u16_t)(htonl((ip6addr)->addr[2]) >> 16) & 0xffff)
#define IP6_ADDR_BLOCK6(ip6addr) ((u16_t)(htonl((ip6addr)->addr[2])) & 0xffff)
#define IP6_ADDR_BLOCK7(ip6addr) ((u16_t)(htonl((ip6addr)->addr[3]) >> 16) & 0xffff)
#define IP6_ADDR_BLOCK8(ip6addr) ((u16_t)(htonl((ip6addr)->addr[3])) & 0xffff)

/** Copy IPv6 address - faster than ip6_addr_set: no NULL check */
#define ip6_addr_copy(dest, src) do{(dest).addr[0] = (src).addr[0]; \
                                    (dest).addr[1] = (src).addr[1]; \
                                    (dest).addr[2] = (src).addr[2]; \
                                    (dest).addr[3] = (src).addr[3];}while(0)
/** Safely copy one IPv6 address to another (src may be NULL) */
#define ip6_addr_set(dest, src) do{(dest)->addr[0] = (src) == NULL ? 0 : (src)->addr[0]; \
                                   (dest)->addr[1] = (src) == NULL ? 0 : (src)->addr[1]; \
                                   (dest)->addr[2] = (src) == NULL ? 0 : (src)->addr[2]; \
                                   (dest)->addr[3] = (src) == NULL ? 0 : (src)->addr[3];}while(0)

/** Set complete address to zero */
#define ip6_addr_set_zero(ip6addr)    do{(ip6addr)->addr[0] = 0; \
                                         (ip6addr)->addr[1] = 0; \
                                         (ip6addr)->addr[2] = 0; \
                                         (ip6addr)->addr[3] = 0;}while(0)

/** Set address to ipv6 'any' (no need for htonl()) */
#define ip6_addr_set_any(ip6addr)       ip6_addr_set_zero(ip6addr)
/** Set address to ipv6 loopback address */
#define ip6_addr_set_loopback(ip6addr) do{(ip6addr)->addr[0] = 0; \
                                          (ip6addr)->addr[1] = 0; \
                                          (ip6addr)->addr[2] = 0; \
                                          (ip6addr)->addr[3] = PP_HTONL(0x00000001UL);}while(0)
/** Safely copy one IPv6 address to another and change byte order
 * from host- to network-order. */
#define ip6_addr_set_hton(dest, src) do{(dest)->addr[0] = (src) == NULL ? 0 : htonl((src)->addr[0]); \
                                        (dest)->addr[1] = (src) == NULL ? 0 : htonl((src)->addr[1]); \
                                        (dest)->addr[2] = (src) == NULL ? 0 : htonl((src)->addr[2]); \
                                        (dest)->addr[3] = (src) == NULL ? 0 : htonl((src)->addr[3]);}while(0)


/**
 * Determine if two IPv6 address are on the same network.
 *
 * @arg addr1 IPv6 address 1
 * @arg addr2 IPv6 address 2
 * @return !0 if the network identifiers of both address match
 */
#define ip6_addr_netcmp(addr1, addr2) (((addr1)->addr[0] == (addr2)->addr[0]) && \
                                       ((addr1)->addr[1] == (addr2)->addr[1]))

#define ip6_addr_cmp(addr1, addr2) (((addr1)->addr[0] == (addr2)->addr[0]) && \
                                    ((addr1)->addr[1] == (addr2)->addr[1]) && \
                                    ((addr1)->addr[2] == (addr2)->addr[2]) && \
                                    ((addr1)->addr[3] == (addr2)->addr[3]))

#define ip6_get_subnet_id(ip6addr)   (htonl((ip6addr)->addr[2]) & 0x0000ffffUL)

#define ip6_addr_isany(ip6addr) (((ip6addr) == NULL) || \
                             (((ip6addr)->addr[0] == 0) && \
                             ((ip6addr)->addr[1] == 0) && \
                             ((ip6addr)->addr[2] == 0) && \
                             ((ip6addr)->addr[3] == 0)))

#define ip6_addr_isloopback(ip6addr) (((ip6addr)->addr[0] == 0UL) && \
                                      ((ip6addr)->addr[1] == 0UL) && \
                                      ((ip6addr)->addr[2] == 0UL) && \
                                      ((ip6addr)->addr[3] == PP_HTONL(0x00000001UL)))

#define ip6_addr_isglobal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xe0000000UL)) == PP_HTONL(0x20000000UL))

#define ip6_addr_islinklocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffc00000UL)) == PP_HTONL(0xfe800000UL))

#define ip6_addr_issitelocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffc00000UL)) == PP_HTONL(0xfec00000UL))

#define ip6_addr_isuniquelocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xfe000000UL)) == PP_HTONL(0xfc000000UL))

#define ip6_addr_ismulticast(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xff000000UL)) == PP_HTONL(0xff000000UL))
#define ip6_addr_multicast_transient_flag(ip6addr)  ((ip6addr)->addr[0] & PP_HTONL(0x00100000UL))
#define ip6_addr_multicast_prefix_flag(ip6addr)     ((ip6addr)->addr[0] & PP_HTONL(0x00200000UL))
#define ip6_addr_multicast_rendezvous_flag(ip6addr) ((ip6addr)->addr[0] & PP_HTONL(0x00400000UL))
#define ip6_addr_multicast_scope(ip6addr) ((htonl((ip6addr)->addr[0]) >> 16) & 0xf)
#define IP6_MULTICAST_SCOPE_RESERVED            0x0
#define IP6_MULTICAST_SCOPE_RESERVED0           0x0
#define IP6_MULTICAST_SCOPE_INTERFACE_LOCAL     0x1
#define IP6_MULTICAST_SCOPE_LINK_LOCAL          0x2
#define IP6_MULTICAST_SCOPE_RESERVED3           0x3
#define IP6_MULTICAST_SCOPE_ADMIN_LOCAL         0x4
#define IP6_MULTICAST_SCOPE_SITE_LOCAL          0x5
#define IP6_MULTICAST_SCOPE_ORGANIZATION_LOCAL  0x8
#define IP6_MULTICAST_SCOPE_GLOBAL              0xe
#define IP6_MULTICAST_SCOPE_RESERVEDF           0xf
#define ip6_addr_ismulticast_iflocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xff010000UL))
#define ip6_addr_ismulticast_linklocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xff020000UL))
#define ip6_addr_ismulticast_adminlocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xff040000UL))
#define ip6_addr_ismulticast_sitelocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xff050000UL))
#define ip6_addr_ismulticast_orglocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xff080000UL))
#define ip6_addr_ismulticast_global(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xff0e0000UL))

/* TODO define get/set for well-know multicast addresses, e.g. ff02::1 */
#define ip6_addr_isallnodes_iflocal(ip6addr) (((ip6addr)->addr[0] == PP_HTONL(0xff010000UL)) && \
    ((ip6addr)->addr[1] == 0UL) && \
    ((ip6addr)->addr[2] == 0UL) && \
    ((ip6addr)->addr[3] == PP_HTONL(0x00000001UL)))

#define ip6_addr_isallnodes_linklocal(ip6addr) (((ip6addr)->addr[0] == PP_HTONL(0xff020000UL)) && \
    ((ip6addr)->addr[1] == 0UL) && \
    ((ip6addr)->addr[2] == 0UL) && \
    ((ip6addr)->addr[3] == PP_HTONL(0x00000001UL)))
#define ip6_addr_set_allnodes_linklocal(ip6addr) do{(ip6addr)->addr[0] = PP_HTONL(0xff020000UL); \
                (ip6addr)->addr[1] = 0; \
                (ip6addr)->addr[2] = 0; \
                (ip6addr)->addr[3] = PP_HTONL(0x00000001UL);}while(0)

#define ip6_addr_isallrouters_linklocal(ip6addr) (((ip6addr)->addr[0] == PP_HTONL(0xff020000UL)) && \
    ((ip6addr)->addr[1] == 0UL) && \
    ((ip6addr)->addr[2] == 0UL) && \
    ((ip6addr)->addr[3] == PP_HTONL(0x00000002UL)))
#define ip6_addr_set_allrouters_linklocal(ip6addr) do{(ip6addr)->addr[0] = PP_HTONL(0xff020000UL); \
                (ip6addr)->addr[1] = 0; \
                (ip6addr)->addr[2] = 0; \
                (ip6addr)->addr[3] = PP_HTONL(0x00000002UL);}while(0)

#define ip6_addr_issolicitednode(ip6addr) ( ((ip6addr)->addr[0] == PP_HTONL(0xff020000UL)) && \
        ((ip6addr)->addr[2] == PP_HTONL(0x00000001UL)) && \
        (((ip6addr)->addr[3] & PP_HTONL(0xff000000UL)) == PP_HTONL(0xff000000UL)) )

#define ip6_addr_set_solicitednode(ip6addr, if_id) do{(ip6addr)->addr[0] = PP_HTONL(0xff020000UL); \
                (ip6addr)->addr[1] = 0; \
                (ip6addr)->addr[2] = PP_HTONL(0x00000001UL); \
                (ip6addr)->addr[3] = (PP_HTONL(0xff000000UL) | (if_id));}while(0)

#define ip6_addr_cmp_solicitednode(ip6addr, sn_addr) (((ip6addr)->addr[0] == PP_HTONL(0xff020000UL)) && \
                                    ((ip6addr)->addr[1] == 0) && \
                                    ((ip6addr)->addr[2] == PP_HTONL(0x00000001UL)) && \
                                    ((ip6addr)->addr[3] == (PP_HTONL(0xff000000UL) | (sn_addr)->addr[3])))

/* IPv6 address states. */
#define IP6_ADDR_INVALID      0x00
#define IP6_ADDR_TENTATIVE    0x08
#define IP6_ADDR_TENTATIVE_1  0x09 /* 1 probe sent */
#define IP6_ADDR_TENTATIVE_2  0x0a /* 2 probes sent */
#define IP6_ADDR_TENTATIVE_3  0x0b /* 3 probes sent */
#define IP6_ADDR_TENTATIVE_4  0x0c /* 4 probes sent */
#define IP6_ADDR_TENTATIVE_5  0x0d /* 5 probes sent */
#define IP6_ADDR_TENTATIVE_6  0x0e /* 6 probes sent */
#define IP6_ADDR_TENTATIVE_7  0x0f /* 7 probes sent */
#define IP6_ADDR_VALID        0x10
#define IP6_ADDR_PREFERRED    0x30
#define IP6_ADDR_DEPRECATED   0x50

#define ip6_addr_isinvalid(addr_state) (addr_state == IP6_ADDR_INVALID)
#define ip6_addr_istentative(addr_state) (addr_state & IP6_ADDR_TENTATIVE)
#define ip6_addr_isvalid(addr_state) (addr_state & IP6_ADDR_VALID) /* Include valid, preferred, and deprecated. */
#define ip6_addr_ispreferred(addr_state) (addr_state == IP6_ADDR_PREFERRED)
#define ip6_addr_isdeprecated(addr_state) (addr_state == IP6_ADDR_DEPRECATED)

#define ip6_addr_debug_print(debug, ipaddr) \
  LWIP_DEBUGF(debug, ("%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F ":%" X16_F, \
                      ipaddr != NULL ? IP6_ADDR_BLOCK1(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK2(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK3(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK4(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK5(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK6(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK7(ipaddr) : 0,    \
                      ipaddr != NULL ? IP6_ADDR_BLOCK8(ipaddr) : 0))

#define IP6ADDR_STRLEN_MAX    46

int ip6addr_aton(const char *cp, ip6_addr_t *addr);
/** returns ptr to static buffer; not reentrant! */
char *ip6addr_ntoa(const ip6_addr_t *addr);
char *ip6addr_ntoa_r(const ip6_addr_t *addr, char *buf, int buflen);



#ifdef __cplusplus
}
#endif

#endif /* LWIP_IPV6 */

#endif /* LWIP_HDR_IP6_ADDR_H */
