tjh.dev
Linux kernel mirror (for testing)
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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
235static 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__ */