2 * Copyright 2011, Siemens AG
3 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
7 * Based on patches from Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
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.
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.
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.
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.
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
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.
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
57 #include <net/net_namespace.h>
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 */
64 #define EUI64_ADDR_LEN 8
66 #define LOWPAN_NHC_MAX_ID_LEN 1
67 /* Max IPHC Header len without IPv6 hdr specific inline data.
68 * Useful for getting the "extra" bytes we need at worst case compression.
70 * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN
72 #define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN)
75 * ipv6 address based on mac
76 * second bit-flip (Universe/Local) is done according RFC2464
78 #define is_addr_mac_addr_based(a, m) \
79 ((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \
80 (((a)->s6_addr[9]) == (m)[1]) && \
81 (((a)->s6_addr[10]) == (m)[2]) && \
82 (((a)->s6_addr[11]) == (m)[3]) && \
83 (((a)->s6_addr[12]) == (m)[4]) && \
84 (((a)->s6_addr[13]) == (m)[5]) && \
85 (((a)->s6_addr[14]) == (m)[6]) && \
86 (((a)->s6_addr[15]) == (m)[7]))
89 * check whether we can compress the IID to 16 bits,
90 * it's possible for unicast adresses with first 49 bits are zero only.
92 #define lowpan_is_iid_16_bit_compressable(a) \
93 ((((a)->s6_addr16[4]) == 0) && \
94 (((a)->s6_addr[10]) == 0) && \
95 (((a)->s6_addr[11]) == 0xff) && \
96 (((a)->s6_addr[12]) == 0xfe) && \
97 (((a)->s6_addr[13]) == 0))
99 /* check whether the 112-bit gid of the multicast address is mappable to: */
101 /* 48 bits, FFXX::00XX:XXXX:XXXX */
102 #define lowpan_is_mcast_addr_compressable48(a) \
103 ((((a)->s6_addr16[1]) == 0) && \
104 (((a)->s6_addr16[2]) == 0) && \
105 (((a)->s6_addr16[3]) == 0) && \
106 (((a)->s6_addr16[4]) == 0) && \
107 (((a)->s6_addr[10]) == 0))
109 /* 32 bits, FFXX::00XX:XXXX */
110 #define lowpan_is_mcast_addr_compressable32(a) \
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_addr[12]) == 0))
118 /* 8 bits, FF02::00XX */
119 #define lowpan_is_mcast_addr_compressable8(a) \
120 ((((a)->s6_addr[1]) == 2) && \
121 (((a)->s6_addr16[1]) == 0) && \
122 (((a)->s6_addr16[2]) == 0) && \
123 (((a)->s6_addr16[3]) == 0) && \
124 (((a)->s6_addr16[4]) == 0) && \
125 (((a)->s6_addr16[5]) == 0) && \
126 (((a)->s6_addr16[6]) == 0) && \
127 (((a)->s6_addr[14]) == 0))
129 #define lowpan_is_addr_broadcast(a) \
130 ((((a)[0]) == 0xFF) && \
131 (((a)[1]) == 0xFF) && \
132 (((a)[2]) == 0xFF) && \
133 (((a)[3]) == 0xFF) && \
134 (((a)[4]) == 0xFF) && \
135 (((a)[5]) == 0xFF) && \
136 (((a)[6]) == 0xFF) && \
139 #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
140 #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
141 #define LOWPAN_DISPATCH_IPHC_MASK 0xe0
143 static inline bool lowpan_is_ipv6(u8 dispatch
)
145 return dispatch
== LOWPAN_DISPATCH_IPV6
;
148 static inline bool lowpan_is_iphc(u8 dispatch
)
150 return (dispatch
& LOWPAN_DISPATCH_IPHC_MASK
) == LOWPAN_DISPATCH_IPHC
;
153 #define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */
155 #define LOWPAN_FRAG1_HEAD_SIZE 0x4
156 #define LOWPAN_FRAGN_HEAD_SIZE 0x5
159 * Values of fields within the IPHC encoding first byte
160 * (C stands for compressed and I for inline)
162 #define LOWPAN_IPHC_TF 0x18
164 #define LOWPAN_IPHC_FL_C 0x10
165 #define LOWPAN_IPHC_TC_C 0x08
166 #define LOWPAN_IPHC_NH_C 0x04
167 #define LOWPAN_IPHC_TTL_1 0x01
168 #define LOWPAN_IPHC_TTL_64 0x02
169 #define LOWPAN_IPHC_TTL_255 0x03
170 #define LOWPAN_IPHC_TTL_I 0x00
173 /* Values of fields within the IPHC encoding second byte */
174 #define LOWPAN_IPHC_CID 0x80
176 #define LOWPAN_IPHC_ADDR_00 0x00
177 #define LOWPAN_IPHC_ADDR_01 0x01
178 #define LOWPAN_IPHC_ADDR_02 0x02
179 #define LOWPAN_IPHC_ADDR_03 0x03
181 #define LOWPAN_IPHC_SAC 0x40
182 #define LOWPAN_IPHC_SAM 0x30
184 #define LOWPAN_IPHC_SAM_BIT 4
186 #define LOWPAN_IPHC_M 0x08
187 #define LOWPAN_IPHC_DAC 0x04
188 #define LOWPAN_IPHC_DAM_00 0x00
189 #define LOWPAN_IPHC_DAM_01 0x01
190 #define LOWPAN_IPHC_DAM_10 0x02
191 #define LOWPAN_IPHC_DAM_11 0x03
193 #define LOWPAN_IPHC_DAM_BIT 0
195 * LOWPAN_UDP encoding (works together with IPHC)
197 #define LOWPAN_NHC_UDP_MASK 0xF8
198 #define LOWPAN_NHC_UDP_ID 0xF0
199 #define LOWPAN_NHC_UDP_CHECKSUMC 0x04
200 #define LOWPAN_NHC_UDP_CHECKSUMI 0x00
202 #define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0
203 #define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0
204 #define LOWPAN_NHC_UDP_8BIT_PORT 0xF000
205 #define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00
207 /* values for port compression, _with checksum_ ie bit 5 set to 0 */
208 #define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */
209 #define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline,
210 dest = 0xF0 + 8 bit inline */
211 #define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline,
212 dest = 16 bit inline */
213 #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
214 #define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */
216 #define LOWPAN_PRIV_SIZE(llpriv_size) \
217 (sizeof(struct lowpan_priv) + llpriv_size)
219 enum lowpan_lltypes
{
221 LOWPAN_LLTYPE_IEEE802154
,
225 enum lowpan_lltypes lltype
;
228 u8 priv
[0] __aligned(sizeof(void *));
232 struct lowpan_priv
*lowpan_priv(const struct net_device
*dev
)
234 return netdev_priv(dev
);
237 struct lowpan_802154_cb
{
244 struct lowpan_802154_cb
*lowpan_802154_cb(const struct sk_buff
*skb
)
246 BUILD_BUG_ON(sizeof(struct lowpan_802154_cb
) > sizeof(skb
->cb
));
247 return (struct lowpan_802154_cb
*)skb
->cb
;
251 /* print data in line */
252 static inline void raw_dump_inline(const char *caller
, char *msg
,
253 unsigned char *buf
, int len
)
256 pr_debug("%s():%s: ", caller
, msg
);
258 print_hex_dump_debug("", DUMP_PREFIX_NONE
, 16, 1, buf
, len
, false);
261 /* print data in a table format:
263 * addr: xx xx xx xx xx xx
264 * addr: xx xx xx xx xx xx
267 static inline void raw_dump_table(const char *caller
, char *msg
,
268 unsigned char *buf
, int len
)
271 pr_debug("%s():%s:\n", caller
, msg
);
273 print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET
, 16, 1, buf
, len
, false);
276 static inline void raw_dump_table(const char *caller
, char *msg
,
277 unsigned char *buf
, int len
) { }
278 static inline void raw_dump_inline(const char *caller
, char *msg
,
279 unsigned char *buf
, int len
) { }
282 static inline int lowpan_fetch_skb_u8(struct sk_buff
*skb
, u8
*val
)
284 if (unlikely(!pskb_may_pull(skb
, 1)))
293 static inline bool lowpan_fetch_skb(struct sk_buff
*skb
,
294 void *data
, const unsigned int len
)
296 if (unlikely(!pskb_may_pull(skb
, len
)))
299 skb_copy_from_linear_data(skb
, data
, len
);
305 static inline void lowpan_push_hc_data(u8
**hc_ptr
, const void *data
,
308 memcpy(*hc_ptr
, data
, len
);
312 void lowpan_netdev_setup(struct net_device
*dev
, enum lowpan_lltypes lltype
);
315 lowpan_header_decompress(struct sk_buff
*skb
, struct net_device
*dev
,
316 const u8
*saddr
, const u8 saddr_type
,
317 const u8 saddr_len
, const u8
*daddr
,
318 const u8 daddr_type
, const u8 daddr_len
,
320 int lowpan_header_compress(struct sk_buff
*skb
, struct net_device
*dev
,
321 unsigned short type
, const void *_daddr
,
322 const void *_saddr
, unsigned int len
);
324 #endif /* __6LOWPAN_H__ */