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44331fe2 AS |
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 | ||
91c69227 | 56 | #include <net/ipv6.h> |
17d8ecb8 | 57 | #include <net/net_namespace.h> |
91c69227 | 58 | |
4d6a6aed AA |
59 | #define EUI64_ADDR_LEN 8 |
60 | ||
87a93e4e | 61 | #define LOWPAN_NHC_MAX_ID_LEN 1 |
bf513fd6 AA |
62 | /* Maximum next header compression length which we currently support inclusive |
63 | * possible inline data. | |
64 | */ | |
65 | #define LOWPAN_NHC_MAX_HDR_LEN (sizeof(struct udphdr)) | |
87a93e4e AA |
66 | /* Max IPHC Header len without IPv6 hdr specific inline data. |
67 | * Useful for getting the "extra" bytes we need at worst case compression. | |
68 | * | |
69 | * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN | |
70 | */ | |
71 | #define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN) | |
bf513fd6 AA |
72 | /* Maximum worst case IPHC header buffer size */ |
73 | #define LOWPAN_IPHC_MAX_HC_BUF_LEN (sizeof(struct ipv6hdr) + \ | |
74 | LOWPAN_IPHC_MAX_HEADER_LEN + \ | |
75 | LOWPAN_NHC_MAX_HDR_LEN) | |
87a93e4e | 76 | |
72a5e6bb AA |
77 | #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ |
78 | #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ | |
79 | #define LOWPAN_DISPATCH_IPHC_MASK 0xe0 | |
44331fe2 | 80 | |
72a5e6bb AA |
81 | static inline bool lowpan_is_ipv6(u8 dispatch) |
82 | { | |
83 | return dispatch == LOWPAN_DISPATCH_IPV6; | |
84 | } | |
85 | ||
86 | static inline bool lowpan_is_iphc(u8 dispatch) | |
87 | { | |
88 | return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC; | |
89 | } | |
719269af | 90 | |
b72f6f51 AA |
91 | #define LOWPAN_PRIV_SIZE(llpriv_size) \ |
92 | (sizeof(struct lowpan_priv) + llpriv_size) | |
93 | ||
94 | enum lowpan_lltypes { | |
95 | LOWPAN_LLTYPE_BTLE, | |
96 | LOWPAN_LLTYPE_IEEE802154, | |
97 | }; | |
98 | ||
99 | struct lowpan_priv { | |
100 | enum lowpan_lltypes lltype; | |
101 | ||
102 | /* must be last */ | |
103 | u8 priv[0] __aligned(sizeof(void *)); | |
104 | }; | |
105 | ||
106 | static inline | |
107 | struct lowpan_priv *lowpan_priv(const struct net_device *dev) | |
108 | { | |
109 | return netdev_priv(dev); | |
110 | } | |
111 | ||
72a5e6bb AA |
112 | struct lowpan_802154_cb { |
113 | u16 d_tag; | |
114 | unsigned int d_size; | |
115 | u8 d_offset; | |
116 | }; | |
117 | ||
118 | static inline | |
119 | struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb) | |
120 | { | |
121 | BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb)); | |
122 | return (struct lowpan_802154_cb *)skb->cb; | |
123 | } | |
124 | ||
841a5ec7 AA |
125 | #ifdef DEBUG |
126 | /* print data in line */ | |
127 | static inline void raw_dump_inline(const char *caller, char *msg, | |
a6f77389 | 128 | const unsigned char *buf, int len) |
841a5ec7 AA |
129 | { |
130 | if (msg) | |
131 | pr_debug("%s():%s: ", caller, msg); | |
132 | ||
133 | print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false); | |
134 | } | |
135 | ||
136 | /* print data in a table format: | |
137 | * | |
138 | * addr: xx xx xx xx xx xx | |
139 | * addr: xx xx xx xx xx xx | |
140 | * ... | |
141 | */ | |
142 | static inline void raw_dump_table(const char *caller, char *msg, | |
a6f77389 | 143 | const unsigned char *buf, int len) |
841a5ec7 AA |
144 | { |
145 | if (msg) | |
146 | pr_debug("%s():%s:\n", caller, msg); | |
147 | ||
148 | print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false); | |
149 | } | |
150 | #else | |
151 | static inline void raw_dump_table(const char *caller, char *msg, | |
a6f77389 | 152 | const unsigned char *buf, int len) { } |
841a5ec7 | 153 | static inline void raw_dump_inline(const char *caller, char *msg, |
a6f77389 | 154 | const unsigned char *buf, int len) { } |
841a5ec7 AA |
155 | #endif |
156 | ||
478208e3 AA |
157 | /** |
158 | * lowpan_fetch_skb - getting inline data from 6LoWPAN header | |
159 | * | |
160 | * This function will pull data from sk buffer and put it into data to | |
161 | * remove the 6LoWPAN inline data. This function returns true if the | |
162 | * sk buffer is too small to pull the amount of data which is specified | |
163 | * by len. | |
164 | * | |
165 | * @skb: the buffer where the inline data should be pulled from. | |
166 | * @data: destination buffer for the inline data. | |
167 | * @len: amount of data which should be pulled in bytes. | |
168 | */ | |
169 | static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data, | |
170 | unsigned int len) | |
4666669f AA |
171 | { |
172 | if (unlikely(!pskb_may_pull(skb, len))) | |
173 | return true; | |
174 | ||
175 | skb_copy_from_linear_data(skb, data, len); | |
176 | skb_pull(skb, len); | |
177 | ||
178 | return false; | |
179 | } | |
180 | ||
3109f2e2 AA |
181 | static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data, |
182 | const size_t len) | |
183 | { | |
184 | memcpy(*hc_ptr, data, len); | |
185 | *hc_ptr += len; | |
186 | } | |
187 | ||
b72f6f51 AA |
188 | void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype); |
189 | ||
8911d774 AA |
190 | /** |
191 | * lowpan_header_decompress - replace 6LoWPAN header with IPv6 header | |
192 | * | |
193 | * This function replaces the IPHC 6LoWPAN header which should be pointed at | |
194 | * skb->data and skb_network_header, with the IPv6 header. | |
195 | * It would be nice that the caller have the necessary headroom of IPv6 header | |
196 | * and greatest Transport layer header, this would reduce the overhead for | |
197 | * reallocate headroom. | |
198 | * | |
199 | * @skb: the buffer which should be manipulate. | |
200 | * @dev: the lowpan net device pointer. | |
201 | * @daddr: destination lladdr of mac header which is used for compression | |
202 | * methods. | |
203 | * @saddr: source lladdr of mac header which is used for compression | |
204 | * methods. | |
205 | */ | |
206 | int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev, | |
207 | const void *daddr, const void *saddr); | |
a6f77389 AA |
208 | |
209 | /** | |
210 | * lowpan_header_compress - replace IPv6 header with 6LoWPAN header | |
211 | * | |
212 | * This function replaces the IPv6 header which should be pointed at | |
213 | * skb->data and skb_network_header, with the IPHC 6LoWPAN header. | |
214 | * The caller need to be sure that the sk buffer is not shared and at have | |
215 | * at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN, | |
216 | * which is the IPHC "more bytes than IPv6 header" at worst case. | |
217 | * | |
218 | * @skb: the buffer which should be manipulate. | |
219 | * @dev: the lowpan net device pointer. | |
220 | * @daddr: destination lladdr of mac header which is used for compression | |
221 | * methods. | |
222 | * @saddr: source lladdr of mac header which is used for compression | |
223 | * methods. | |
224 | */ | |
225 | int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev, | |
226 | const void *daddr, const void *saddr); | |
8df8c56a | 227 | |
44331fe2 | 228 | #endif /* __6LOWPAN_H__ */ |