linux/net/ieee802154/6lowpan.h
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   1/*
   2 * Copyright 2011, Siemens AG
   3 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   4 */
   5
   6/*
   7 * Based on patches from Jon Smirl <jonsmirl@gmail.com>
   8 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2
  12 * as published by the Free Software Foundation.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License along
  20 * with this program; if not, write to the Free Software Foundation, Inc.,
  21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22 */
  23
  24/* Jon's code is based on 6lowpan implementation for Contiki which is:
  25 * Copyright (c) 2008, Swedish Institute of Computer Science.
  26 * All rights reserved.
  27 *
  28 * Redistribution and use in source and binary forms, with or without
  29 * modification, are permitted provided that the following conditions
  30 * are met:
  31 * 1. Redistributions of source code must retain the above copyright
  32 *    notice, this list of conditions and the following disclaimer.
  33 * 2. Redistributions in binary form must reproduce the above copyright
  34 *    notice, this list of conditions and the following disclaimer in the
  35 *    documentation and/or other materials provided with the distribution.
  36 * 3. Neither the name of the Institute nor the names of its contributors
  37 *    may be used to endorse or promote products derived from this software
  38 *    without specific prior written permission.
  39 *
  40 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50 * SUCH DAMAGE.
  51 */
  52
  53#ifndef __6LOWPAN_H__
  54#define __6LOWPAN_H__
  55
  56#define UIP_802154_SHORTADDR_LEN        2  /* compressed ipv6 address length */
  57#define UIP_IPH_LEN                     40 /* ipv6 fixed header size */
  58#define UIP_PROTO_UDP                   17 /* ipv6 next header value for UDP */
  59#define UIP_FRAGH_LEN                   8  /* ipv6 fragment header size */
  60
  61/*
  62 * ipv6 address based on mac
  63 * second bit-flip (Universe/Local) is done according RFC2464
  64 */
  65#define is_addr_mac_addr_based(a, m) \
  66        ((((a)->s6_addr[8])  == (((m)[0]) ^ 0x02)) &&   \
  67         (((a)->s6_addr[9])  == (m)[1]) &&              \
  68         (((a)->s6_addr[10]) == (m)[2]) &&              \
  69         (((a)->s6_addr[11]) == (m)[3]) &&              \
  70         (((a)->s6_addr[12]) == (m)[4]) &&              \
  71         (((a)->s6_addr[13]) == (m)[5]) &&              \
  72         (((a)->s6_addr[14]) == (m)[6]) &&              \
  73         (((a)->s6_addr[15]) == (m)[7]))
  74
  75/* ipv6 address is unspecified */
  76#define is_addr_unspecified(a)          \
  77        ((((a)->s6_addr32[0]) == 0) &&  \
  78         (((a)->s6_addr32[1]) == 0) &&  \
  79         (((a)->s6_addr32[2]) == 0) &&  \
  80         (((a)->s6_addr32[3]) == 0))
  81
  82/* compare ipv6 addresses prefixes */
  83#define ipaddr_prefixcmp(addr1, addr2, length) \
  84        (memcmp(addr1, addr2, length >> 3) == 0)
  85
  86/* local link, i.e. FE80::/10 */
  87#define is_addr_link_local(a) (((a)->s6_addr16[0]) == htons(0xFE80))
  88
  89/*
  90 * check whether we can compress the IID to 16 bits,
  91 * it's possible for unicast adresses with first 49 bits are zero only.
  92 */
  93#define lowpan_is_iid_16_bit_compressable(a)    \
  94        ((((a)->s6_addr16[4]) == 0) &&          \
  95         (((a)->s6_addr16[5]) == 0) &&          \
  96         (((a)->s6_addr16[6]) == 0) &&          \
  97         ((((a)->s6_addr[14]) & 0x80) == 0))
  98
  99/* multicast address */
 100#define is_addr_mcast(a) (((a)->s6_addr[0]) == 0xFF)
 101
 102/* check whether the 112-bit gid of the multicast address is mappable to: */
 103
 104/* 9 bits, for FF02::1 (all nodes) and FF02::2 (all routers) addresses only. */
 105#define lowpan_is_mcast_addr_compressable(a)    \
 106        ((((a)->s6_addr16[1]) == 0) &&          \
 107         (((a)->s6_addr16[2]) == 0) &&          \
 108         (((a)->s6_addr16[3]) == 0) &&          \
 109         (((a)->s6_addr16[4]) == 0) &&          \
 110         (((a)->s6_addr16[5]) == 0) &&          \
 111         (((a)->s6_addr16[6]) == 0) &&          \
 112         (((a)->s6_addr[14])  == 0) &&          \
 113         ((((a)->s6_addr[15]) == 1) || (((a)->s6_addr[15]) == 2)))
 114
 115/* 48 bits, FFXX::00XX:XXXX:XXXX */
 116#define lowpan_is_mcast_addr_compressable48(a)  \
 117        ((((a)->s6_addr16[1]) == 0) &&          \
 118         (((a)->s6_addr16[2]) == 0) &&          \
 119         (((a)->s6_addr16[3]) == 0) &&          \
 120         (((a)->s6_addr16[4]) == 0) &&          \
 121         (((a)->s6_addr[10]) == 0))
 122
 123/* 32 bits, FFXX::00XX:XXXX */
 124#define lowpan_is_mcast_addr_compressable32(a)  \
 125        ((((a)->s6_addr16[1]) == 0) &&          \
 126         (((a)->s6_addr16[2]) == 0) &&          \
 127         (((a)->s6_addr16[3]) == 0) &&          \
 128         (((a)->s6_addr16[4]) == 0) &&          \
 129         (((a)->s6_addr16[5]) == 0) &&          \
 130         (((a)->s6_addr[12]) == 0))
 131
 132/* 8 bits, FF02::00XX */
 133#define lowpan_is_mcast_addr_compressable8(a)   \
 134        ((((a)->s6_addr[1])  == 2) &&           \
 135         (((a)->s6_addr16[1]) == 0) &&          \
 136         (((a)->s6_addr16[2]) == 0) &&          \
 137         (((a)->s6_addr16[3]) == 0) &&          \
 138         (((a)->s6_addr16[4]) == 0) &&          \
 139         (((a)->s6_addr16[5]) == 0) &&          \
 140         (((a)->s6_addr16[6]) == 0) &&          \
 141         (((a)->s6_addr[14]) == 0))
 142
 143#define lowpan_is_addr_broadcast(a)     \
 144        ((((a)[0]) == 0xFF) &&  \
 145         (((a)[1]) == 0xFF) &&  \
 146         (((a)[2]) == 0xFF) &&  \
 147         (((a)[3]) == 0xFF) &&  \
 148         (((a)[4]) == 0xFF) &&  \
 149         (((a)[5]) == 0xFF) &&  \
 150         (((a)[6]) == 0xFF) &&  \
 151         (((a)[7]) == 0xFF))
 152
 153#define LOWPAN_DISPATCH_IPV6    0x41 /* 01000001 = 65 */
 154#define LOWPAN_DISPATCH_HC1     0x42 /* 01000010 = 66 */
 155#define LOWPAN_DISPATCH_IPHC    0x60 /* 011xxxxx = ... */
 156#define LOWPAN_DISPATCH_FRAG1   0xc0 /* 11000xxx */
 157#define LOWPAN_DISPATCH_FRAGN   0xe0 /* 11100xxx */
 158
 159#define LOWPAN_DISPATCH_MASK    0xf8 /* 11111000 */
 160
 161#define LOWPAN_FRAG_TIMEOUT     (HZ * 60)       /* time-out 60 sec */
 162
 163#define LOWPAN_FRAG1_HEAD_SIZE  0x4
 164#define LOWPAN_FRAGN_HEAD_SIZE  0x5
 165
 166/*
 167 * According IEEE802.15.4 standard:
 168 *   - MTU is 127 octets
 169 *   - maximum MHR size is 37 octets
 170 *   - MFR size is 2 octets
 171 *
 172 * so minimal payload size that we may guarantee is:
 173 *   MTU - MHR - MFR = 88 octets
 174 */
 175#define LOWPAN_FRAG_SIZE        88
 176
 177/*
 178 * Values of fields within the IPHC encoding first byte
 179 * (C stands for compressed and I for inline)
 180 */
 181#define LOWPAN_IPHC_TF          0x18
 182
 183#define LOWPAN_IPHC_FL_C        0x10
 184#define LOWPAN_IPHC_TC_C        0x08
 185#define LOWPAN_IPHC_NH_C        0x04
 186#define LOWPAN_IPHC_TTL_1       0x01
 187#define LOWPAN_IPHC_TTL_64      0x02
 188#define LOWPAN_IPHC_TTL_255     0x03
 189#define LOWPAN_IPHC_TTL_I       0x00
 190
 191
 192/* Values of fields within the IPHC encoding second byte */
 193#define LOWPAN_IPHC_CID         0x80
 194
 195#define LOWPAN_IPHC_SAC         0x40
 196#define LOWPAN_IPHC_SAM_00      0x00
 197#define LOWPAN_IPHC_SAM_01      0x10
 198#define LOWPAN_IPHC_SAM_10      0x20
 199#define LOWPAN_IPHC_SAM         0x30
 200
 201#define LOWPAN_IPHC_SAM_BIT     4
 202
 203#define LOWPAN_IPHC_M           0x08
 204#define LOWPAN_IPHC_DAC         0x04
 205#define LOWPAN_IPHC_DAM_00      0x00
 206#define LOWPAN_IPHC_DAM_01      0x01
 207#define LOWPAN_IPHC_DAM_10      0x02
 208#define LOWPAN_IPHC_DAM_11      0x03
 209
 210#define LOWPAN_IPHC_DAM_BIT     0
 211/*
 212 * LOWPAN_UDP encoding (works together with IPHC)
 213 */
 214#define LOWPAN_NHC_UDP_MASK             0xF8
 215#define LOWPAN_NHC_UDP_ID               0xF0
 216#define LOWPAN_NHC_UDP_CHECKSUMC        0x04
 217#define LOWPAN_NHC_UDP_CHECKSUMI        0x00
 218
 219#define LOWPAN_NHC_UDP_4BIT_PORT        0xF0B0
 220#define LOWPAN_NHC_UDP_4BIT_MASK        0xFFF0
 221#define LOWPAN_NHC_UDP_8BIT_PORT        0xF000
 222#define LOWPAN_NHC_UDP_8BIT_MASK        0xFF00
 223
 224/* values for port compression, _with checksum_ ie bit 5 set to 0 */
 225#define LOWPAN_NHC_UDP_CS_P_00  0xF0 /* all inline */
 226#define LOWPAN_NHC_UDP_CS_P_01  0xF1 /* source 16bit inline,
 227                                        dest = 0xF0 + 8 bit inline */
 228#define LOWPAN_NHC_UDP_CS_P_10  0xF2 /* source = 0xF0 + 8bit inline,
 229                                        dest = 16 bit inline */
 230#define LOWPAN_NHC_UDP_CS_P_11  0xF3 /* source & dest = 0xF0B + 4bit inline */
 231
 232#endif /* __6LOWPAN_H__ */
 233
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