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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_addr[10]) == 0) && \ |
| 96 | (((a)->s6_addr[11]) == 0xff) && \ |
| 97 | (((a)->s6_addr[12]) == 0xfe) && \ |
| 98 | (((a)->s6_addr[13]) == 0)) |
| 99 | |
| 100 | /* multicast address */ |
| 101 | #define is_addr_mcast(a) (((a)->s6_addr[0]) == 0xFF) |
| 102 | |
| 103 | /* check whether the 112-bit gid of the multicast address is mappable to: */ |
| 104 | |
| 105 | /* 9 bits, for FF02::1 (all nodes) and FF02::2 (all routers) addresses only. */ |
| 106 | #define lowpan_is_mcast_addr_compressable(a) \ |
| 107 | ((((a)->s6_addr16[1]) == 0) && \ |
| 108 | (((a)->s6_addr16[2]) == 0) && \ |
| 109 | (((a)->s6_addr16[3]) == 0) && \ |
| 110 | (((a)->s6_addr16[4]) == 0) && \ |
| 111 | (((a)->s6_addr16[5]) == 0) && \ |
| 112 | (((a)->s6_addr16[6]) == 0) && \ |
| 113 | (((a)->s6_addr[14]) == 0) && \ |
| 114 | ((((a)->s6_addr[15]) == 1) || (((a)->s6_addr[15]) == 2))) |
| 115 | |
| 116 | /* 48 bits, FFXX::00XX:XXXX:XXXX */ |
| 117 | #define lowpan_is_mcast_addr_compressable48(a) \ |
| 118 | ((((a)->s6_addr16[1]) == 0) && \ |
| 119 | (((a)->s6_addr16[2]) == 0) && \ |
| 120 | (((a)->s6_addr16[3]) == 0) && \ |
| 121 | (((a)->s6_addr16[4]) == 0) && \ |
| 122 | (((a)->s6_addr[10]) == 0)) |
| 123 | |
| 124 | /* 32 bits, FFXX::00XX:XXXX */ |
| 125 | #define lowpan_is_mcast_addr_compressable32(a) \ |
| 126 | ((((a)->s6_addr16[1]) == 0) && \ |
| 127 | (((a)->s6_addr16[2]) == 0) && \ |
| 128 | (((a)->s6_addr16[3]) == 0) && \ |
| 129 | (((a)->s6_addr16[4]) == 0) && \ |
| 130 | (((a)->s6_addr16[5]) == 0) && \ |
| 131 | (((a)->s6_addr[12]) == 0)) |
| 132 | |
| 133 | /* 8 bits, FF02::00XX */ |
| 134 | #define lowpan_is_mcast_addr_compressable8(a) \ |
| 135 | ((((a)->s6_addr[1]) == 2) && \ |
| 136 | (((a)->s6_addr16[1]) == 0) && \ |
| 137 | (((a)->s6_addr16[2]) == 0) && \ |
| 138 | (((a)->s6_addr16[3]) == 0) && \ |
| 139 | (((a)->s6_addr16[4]) == 0) && \ |
| 140 | (((a)->s6_addr16[5]) == 0) && \ |
| 141 | (((a)->s6_addr16[6]) == 0) && \ |
| 142 | (((a)->s6_addr[14]) == 0)) |
| 143 | |
| 144 | #define lowpan_is_addr_broadcast(a) \ |
| 145 | ((((a)[0]) == 0xFF) && \ |
| 146 | (((a)[1]) == 0xFF) && \ |
| 147 | (((a)[2]) == 0xFF) && \ |
| 148 | (((a)[3]) == 0xFF) && \ |
| 149 | (((a)[4]) == 0xFF) && \ |
| 150 | (((a)[5]) == 0xFF) && \ |
| 151 | (((a)[6]) == 0xFF) && \ |
| 152 | (((a)[7]) == 0xFF)) |
| 153 | |
| 154 | #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ |
| 155 | #define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */ |
| 156 | #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ |
| 157 | #define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */ |
| 158 | #define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */ |
| 159 | |
| 160 | #define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */ |
| 161 | |
| 162 | #define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */ |
| 163 | |
| 164 | #define LOWPAN_FRAG1_HEAD_SIZE 0x4 |
| 165 | #define LOWPAN_FRAGN_HEAD_SIZE 0x5 |
| 166 | |
| 167 | /* |
| 168 | * According IEEE802.15.4 standard: |
| 169 | * - MTU is 127 octets |
| 170 | * - maximum MHR size is 37 octets |
| 171 | * - MFR size is 2 octets |
| 172 | * |
| 173 | * so minimal payload size that we may guarantee is: |
| 174 | * MTU - MHR - MFR = 88 octets |
| 175 | */ |
| 176 | #define LOWPAN_FRAG_SIZE 88 |
| 177 | |
| 178 | /* |
| 179 | * Values of fields within the IPHC encoding first byte |
| 180 | * (C stands for compressed and I for inline) |
| 181 | */ |
| 182 | #define LOWPAN_IPHC_TF 0x18 |
| 183 | |
| 184 | #define LOWPAN_IPHC_FL_C 0x10 |
| 185 | #define LOWPAN_IPHC_TC_C 0x08 |
| 186 | #define LOWPAN_IPHC_NH_C 0x04 |
| 187 | #define LOWPAN_IPHC_TTL_1 0x01 |
| 188 | #define LOWPAN_IPHC_TTL_64 0x02 |
| 189 | #define LOWPAN_IPHC_TTL_255 0x03 |
| 190 | #define LOWPAN_IPHC_TTL_I 0x00 |
| 191 | |
| 192 | |
| 193 | /* Values of fields within the IPHC encoding second byte */ |
| 194 | #define LOWPAN_IPHC_CID 0x80 |
| 195 | |
| 196 | #define LOWPAN_IPHC_ADDR_00 0x00 |
| 197 | #define LOWPAN_IPHC_ADDR_01 0x01 |
| 198 | #define LOWPAN_IPHC_ADDR_02 0x02 |
| 199 | #define LOWPAN_IPHC_ADDR_03 0x03 |
| 200 | |
| 201 | #define LOWPAN_IPHC_SAC 0x40 |
| 202 | #define LOWPAN_IPHC_SAM 0x30 |
| 203 | |
| 204 | #define LOWPAN_IPHC_SAM_BIT 4 |
| 205 | |
| 206 | #define LOWPAN_IPHC_M 0x08 |
| 207 | #define LOWPAN_IPHC_DAC 0x04 |
| 208 | #define LOWPAN_IPHC_DAM_00 0x00 |
| 209 | #define LOWPAN_IPHC_DAM_01 0x01 |
| 210 | #define LOWPAN_IPHC_DAM_10 0x02 |
| 211 | #define LOWPAN_IPHC_DAM_11 0x03 |
| 212 | |
| 213 | #define LOWPAN_IPHC_DAM_BIT 0 |
| 214 | /* |
| 215 | * LOWPAN_UDP encoding (works together with IPHC) |
| 216 | */ |
| 217 | #define LOWPAN_NHC_UDP_MASK 0xF8 |
| 218 | #define LOWPAN_NHC_UDP_ID 0xF0 |
| 219 | #define LOWPAN_NHC_UDP_CHECKSUMC 0x04 |
| 220 | #define LOWPAN_NHC_UDP_CHECKSUMI 0x00 |
| 221 | |
| 222 | #define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0 |
| 223 | #define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0 |
| 224 | #define LOWPAN_NHC_UDP_8BIT_PORT 0xF000 |
| 225 | #define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00 |
| 226 | |
| 227 | /* values for port compression, _with checksum_ ie bit 5 set to 0 */ |
| 228 | #define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */ |
| 229 | #define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline, |
| 230 | dest = 0xF0 + 8 bit inline */ |
| 231 | #define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline, |
| 232 | dest = 16 bit inline */ |
| 233 | #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */ |
| 234 | |
| 235 | static inline bool lowpan_fetch_skb(struct sk_buff *skb, |
| 236 | void *data, const unsigned int len) |
| 237 | { |
| 238 | if (unlikely(!pskb_may_pull(skb, len))) |
| 239 | return true; |
| 240 | |
| 241 | skb_copy_from_linear_data(skb, data, len); |
| 242 | skb_pull(skb, len); |
| 243 | |
| 244 | return false; |
| 245 | } |
| 246 | |
| 247 | #endif /* __6LOWPAN_H__ */ |
| 248 |
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Tags:
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v2.6.34-rc5
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