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Linux/include/net/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 #include <net/ipv6.h>
 57 #include <net/net_namespace.h>
 58 
 59 #define UIP_802154_SHORTADDR_LEN        2  /* compressed ipv6 address length */
 60 #define UIP_IPH_LEN                     40 /* ipv6 fixed header size */
 61 #define UIP_PROTO_UDP                   17 /* ipv6 next header value for UDP */
 62 #define UIP_FRAGH_LEN                   8  /* ipv6 fragment header size */
 63 
 64 /*
 65  * ipv6 address based on mac
 66  * second bit-flip (Universe/Local) is done according RFC2464
 67  */
 68 #define is_addr_mac_addr_based(a, m) \
 69         ((((a)->s6_addr[8])  == (((m)[0]) ^ 0x02)) &&   \
 70          (((a)->s6_addr[9])  == (m)[1]) &&              \
 71          (((a)->s6_addr[10]) == (m)[2]) &&              \
 72          (((a)->s6_addr[11]) == (m)[3]) &&              \
 73          (((a)->s6_addr[12]) == (m)[4]) &&              \
 74          (((a)->s6_addr[13]) == (m)[5]) &&              \
 75          (((a)->s6_addr[14]) == (m)[6]) &&              \
 76          (((a)->s6_addr[15]) == (m)[7]))
 77 
 78 /*
 79  * check whether we can compress the IID to 16 bits,
 80  * it's possible for unicast adresses with first 49 bits are zero only.
 81  */
 82 #define lowpan_is_iid_16_bit_compressable(a)    \
 83         ((((a)->s6_addr16[4]) == 0) &&          \
 84          (((a)->s6_addr[10]) == 0) &&           \
 85          (((a)->s6_addr[11]) == 0xff) &&        \
 86          (((a)->s6_addr[12]) == 0xfe) &&        \
 87          (((a)->s6_addr[13]) == 0))
 88 
 89 /* check whether the 112-bit gid of the multicast address is mappable to: */
 90 
 91 /* 48 bits, FFXX::00XX:XXXX:XXXX */
 92 #define lowpan_is_mcast_addr_compressable48(a)  \
 93         ((((a)->s6_addr16[1]) == 0) &&          \
 94          (((a)->s6_addr16[2]) == 0) &&          \
 95          (((a)->s6_addr16[3]) == 0) &&          \
 96          (((a)->s6_addr16[4]) == 0) &&          \
 97          (((a)->s6_addr[10]) == 0))
 98 
 99 /* 32 bits, FFXX::00XX:XXXX */
100 #define lowpan_is_mcast_addr_compressable32(a)  \
101         ((((a)->s6_addr16[1]) == 0) &&          \
102          (((a)->s6_addr16[2]) == 0) &&          \
103          (((a)->s6_addr16[3]) == 0) &&          \
104          (((a)->s6_addr16[4]) == 0) &&          \
105          (((a)->s6_addr16[5]) == 0) &&          \
106          (((a)->s6_addr[12]) == 0))
107 
108 /* 8 bits, FF02::00XX */
109 #define lowpan_is_mcast_addr_compressable8(a)   \
110         ((((a)->s6_addr[1])  == 2) &&           \
111          (((a)->s6_addr16[1]) == 0) &&          \
112          (((a)->s6_addr16[2]) == 0) &&          \
113          (((a)->s6_addr16[3]) == 0) &&          \
114          (((a)->s6_addr16[4]) == 0) &&          \
115          (((a)->s6_addr16[5]) == 0) &&          \
116          (((a)->s6_addr16[6]) == 0) &&          \
117          (((a)->s6_addr[14]) == 0))
118 
119 #define lowpan_is_addr_broadcast(a)     \
120         ((((a)[0]) == 0xFF) &&  \
121          (((a)[1]) == 0xFF) &&  \
122          (((a)[2]) == 0xFF) &&  \
123          (((a)[3]) == 0xFF) &&  \
124          (((a)[4]) == 0xFF) &&  \
125          (((a)[5]) == 0xFF) &&  \
126          (((a)[6]) == 0xFF) &&  \
127          (((a)[7]) == 0xFF))
128 
129 #define LOWPAN_DISPATCH_IPV6    0x41 /* 01000001 = 65 */
130 #define LOWPAN_DISPATCH_HC1     0x42 /* 01000010 = 66 */
131 #define LOWPAN_DISPATCH_IPHC    0x60 /* 011xxxxx = ... */
132 #define LOWPAN_DISPATCH_FRAG1   0xc0 /* 11000xxx */
133 #define LOWPAN_DISPATCH_FRAGN   0xe0 /* 11100xxx */
134 
135 #define LOWPAN_DISPATCH_MASK    0xf8 /* 11111000 */
136 
137 #define LOWPAN_FRAG_TIMEOUT     (HZ * 60)       /* time-out 60 sec */
138 
139 #define LOWPAN_FRAG1_HEAD_SIZE  0x4
140 #define LOWPAN_FRAGN_HEAD_SIZE  0x5
141 
142 /*
143  * Values of fields within the IPHC encoding first byte
144  * (C stands for compressed and I for inline)
145  */
146 #define LOWPAN_IPHC_TF          0x18
147 
148 #define LOWPAN_IPHC_FL_C        0x10
149 #define LOWPAN_IPHC_TC_C        0x08
150 #define LOWPAN_IPHC_NH_C        0x04
151 #define LOWPAN_IPHC_TTL_1       0x01
152 #define LOWPAN_IPHC_TTL_64      0x02
153 #define LOWPAN_IPHC_TTL_255     0x03
154 #define LOWPAN_IPHC_TTL_I       0x00
155 
156 
157 /* Values of fields within the IPHC encoding second byte */
158 #define LOWPAN_IPHC_CID         0x80
159 
160 #define LOWPAN_IPHC_ADDR_00     0x00
161 #define LOWPAN_IPHC_ADDR_01     0x01
162 #define LOWPAN_IPHC_ADDR_02     0x02
163 #define LOWPAN_IPHC_ADDR_03     0x03
164 
165 #define LOWPAN_IPHC_SAC         0x40
166 #define LOWPAN_IPHC_SAM         0x30
167 
168 #define LOWPAN_IPHC_SAM_BIT     4
169 
170 #define LOWPAN_IPHC_M           0x08
171 #define LOWPAN_IPHC_DAC         0x04
172 #define LOWPAN_IPHC_DAM_00      0x00
173 #define LOWPAN_IPHC_DAM_01      0x01
174 #define LOWPAN_IPHC_DAM_10      0x02
175 #define LOWPAN_IPHC_DAM_11      0x03
176 
177 #define LOWPAN_IPHC_DAM_BIT     0
178 /*
179  * LOWPAN_UDP encoding (works together with IPHC)
180  */
181 #define LOWPAN_NHC_UDP_MASK             0xF8
182 #define LOWPAN_NHC_UDP_ID               0xF0
183 #define LOWPAN_NHC_UDP_CHECKSUMC        0x04
184 #define LOWPAN_NHC_UDP_CHECKSUMI        0x00
185 
186 #define LOWPAN_NHC_UDP_4BIT_PORT        0xF0B0
187 #define LOWPAN_NHC_UDP_4BIT_MASK        0xFFF0
188 #define LOWPAN_NHC_UDP_8BIT_PORT        0xF000
189 #define LOWPAN_NHC_UDP_8BIT_MASK        0xFF00
190 
191 /* values for port compression, _with checksum_ ie bit 5 set to 0 */
192 #define LOWPAN_NHC_UDP_CS_P_00  0xF0 /* all inline */
193 #define LOWPAN_NHC_UDP_CS_P_01  0xF1 /* source 16bit inline,
194                                         dest = 0xF0 + 8 bit inline */
195 #define LOWPAN_NHC_UDP_CS_P_10  0xF2 /* source = 0xF0 + 8bit inline,
196                                         dest = 16 bit inline */
197 #define LOWPAN_NHC_UDP_CS_P_11  0xF3 /* source & dest = 0xF0B + 4bit inline */
198 #define LOWPAN_NHC_UDP_CS_C     0x04 /* checksum elided */
199 
200 #ifdef DEBUG
201 /* print data in line */
202 static inline void raw_dump_inline(const char *caller, char *msg,
203                                    unsigned char *buf, int len)
204 {
205         if (msg)
206                 pr_debug("%s():%s: ", caller, msg);
207 
208         print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
209 }
210 
211 /* print data in a table format:
212  *
213  * addr: xx xx xx xx xx xx
214  * addr: xx xx xx xx xx xx
215  * ...
216  */
217 static inline void raw_dump_table(const char *caller, char *msg,
218                                   unsigned char *buf, int len)
219 {
220         if (msg)
221                 pr_debug("%s():%s:\n", caller, msg);
222 
223         print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
224 }
225 #else
226 static inline void raw_dump_table(const char *caller, char *msg,
227                                   unsigned char *buf, int len) { }
228 static inline void raw_dump_inline(const char *caller, char *msg,
229                                    unsigned char *buf, int len) { }
230 #endif
231 
232 static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
233 {
234         if (unlikely(!pskb_may_pull(skb, 1)))
235                 return -EINVAL;
236 
237         *val = skb->data[0];
238         skb_pull(skb, 1);
239 
240         return 0;
241 }
242 
243 static inline bool lowpan_fetch_skb(struct sk_buff *skb,
244                 void *data, const unsigned int len)
245 {
246         if (unlikely(!pskb_may_pull(skb, len)))
247                 return true;
248 
249         skb_copy_from_linear_data(skb, data, len);
250         skb_pull(skb, len);
251 
252         return false;
253 }
254 
255 static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
256                                        const size_t len)
257 {
258         memcpy(*hc_ptr, data, len);
259         *hc_ptr += len;
260 }
261 
262 static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
263 {
264         static const u8 addr_sizes[] = {
265                 [LOWPAN_IPHC_ADDR_00] = 16,
266                 [LOWPAN_IPHC_ADDR_01] = 8,
267                 [LOWPAN_IPHC_ADDR_02] = 2,
268                 [LOWPAN_IPHC_ADDR_03] = 0,
269         };
270         return addr_sizes[addr_mode];
271 }
272 
273 static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header)
274 {
275         u8 ret = 1;
276 
277         if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
278                 *uncomp_header += sizeof(struct udphdr);
279 
280                 switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
281                 case LOWPAN_NHC_UDP_CS_P_00:
282                         ret += 4;
283                         break;
284                 case LOWPAN_NHC_UDP_CS_P_01:
285                 case LOWPAN_NHC_UDP_CS_P_10:
286                         ret += 3;
287                         break;
288                 case LOWPAN_NHC_UDP_CS_P_11:
289                         ret++;
290                         break;
291                 default:
292                         break;
293                 }
294 
295                 if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
296                         ret += 2;
297         }
298 
299         return ret;
300 }
301 
302 /**
303  *      lowpan_uncompress_size - returns skb->len size with uncompressed header
304  *      @skb: sk_buff with 6lowpan header inside
305  *      @datagram_offset: optional to get the datagram_offset value
306  *
307  *      Returns the skb->len with uncompressed header
308  */
309 static inline u16
310 lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
311 {
312         u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
313         u8 iphc0, iphc1, h_enc;
314 
315         iphc0 = skb_network_header(skb)[0];
316         iphc1 = skb_network_header(skb)[1];
317 
318         switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
319         case 0:
320                 ret += 4;
321                 break;
322         case 1:
323                 ret += 3;
324                 break;
325         case 2:
326                 ret++;
327                 break;
328         default:
329                 break;
330         }
331 
332         if (!(iphc0 & LOWPAN_IPHC_NH_C))
333                 ret++;
334 
335         if (!(iphc0 & 0x03))
336                 ret++;
337 
338         ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
339                                      LOWPAN_IPHC_SAM_BIT);
340 
341         if (iphc1 & LOWPAN_IPHC_M) {
342                 switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
343                         LOWPAN_IPHC_DAM_BIT) {
344                 case LOWPAN_IPHC_DAM_00:
345                         ret += 16;
346                         break;
347                 case LOWPAN_IPHC_DAM_01:
348                         ret += 6;
349                         break;
350                 case LOWPAN_IPHC_DAM_10:
351                         ret += 4;
352                         break;
353                 case LOWPAN_IPHC_DAM_11:
354                         ret++;
355                         break;
356                 default:
357                         break;
358                 }
359         } else {
360                 ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
361                                              LOWPAN_IPHC_DAM_BIT);
362         }
363 
364         if (iphc0 & LOWPAN_IPHC_NH_C) {
365                 h_enc = skb_network_header(skb)[ret];
366                 ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
367         }
368 
369         if (dgram_offset)
370                 *dgram_offset = uncomp_header;
371 
372         return skb->len + uncomp_header - ret;
373 }
374 
375 int
376 lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev,
377                          const u8 *saddr, const u8 saddr_type,
378                          const u8 saddr_len, const u8 *daddr,
379                          const u8 daddr_type, const u8 daddr_len,
380                          u8 iphc0, u8 iphc1);
381 int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
382                         unsigned short type, const void *_daddr,
383                         const void *_saddr, unsigned int len);
384 
385 #endif /* __6LOWPAN_H__ */
386 

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