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 EUI64_ADDR_LEN 8
61 #define LOWPAN_NHC_MAX_ID_LEN 1
62 /* Maximum next header compression length which we currently support inclusive
63 * possible inline data.
65 #define LOWPAN_NHC_MAX_HDR_LEN (sizeof(struct udphdr))
66 /* Max IPHC Header len without IPv6 hdr specific inline data.
67 * Useful for getting the "extra" bytes we need at worst case compression.
69 * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN
71 #define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN)
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)
77 #define lowpan_is_addr_broadcast(a) \
78 ((((a)[0]) == 0xFF) && \
79 (((a)[1]) == 0xFF) && \
80 (((a)[2]) == 0xFF) && \
81 (((a)[3]) == 0xFF) && \
82 (((a)[4]) == 0xFF) && \
83 (((a)[5]) == 0xFF) && \
84 (((a)[6]) == 0xFF) && \
87 #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
88 #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
89 #define LOWPAN_DISPATCH_IPHC_MASK 0xe0
91 static inline bool lowpan_is_ipv6(u8 dispatch)
93 return dispatch == LOWPAN_DISPATCH_IPV6;
96 static inline bool lowpan_is_iphc(u8 dispatch)
98 return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC;
101 #define LOWPAN_PRIV_SIZE(llpriv_size) \
102 (sizeof(struct lowpan_priv) + llpriv_size)
104 enum lowpan_lltypes {
106 LOWPAN_LLTYPE_IEEE802154,
110 enum lowpan_lltypes lltype;
113 u8 priv[0] __aligned(sizeof(void *));
117 struct lowpan_priv *lowpan_priv(const struct net_device *dev)
119 return netdev_priv(dev);
122 struct lowpan_802154_cb {
129 struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb)
131 BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb));
132 return (struct lowpan_802154_cb *)skb->cb;
136 /* print data in line */
137 static inline void raw_dump_inline(const char *caller, char *msg,
138 const unsigned char *buf, int len)
141 pr_debug("%s():%s: ", caller, msg);
143 print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
146 /* print data in a table format:
148 * addr: xx xx xx xx xx xx
149 * addr: xx xx xx xx xx xx
152 static inline void raw_dump_table(const char *caller, char *msg,
153 const unsigned char *buf, int len)
156 pr_debug("%s():%s:\n", caller, msg);
158 print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
161 static inline void raw_dump_table(const char *caller, char *msg,
162 const unsigned char *buf, int len) { }
163 static inline void raw_dump_inline(const char *caller, char *msg,
164 const unsigned char *buf, int len) { }
168 * lowpan_fetch_skb - getting inline data from 6LoWPAN header
170 * This function will pull data from sk buffer and put it into data to
171 * remove the 6LoWPAN inline data. This function returns true if the
172 * sk buffer is too small to pull the amount of data which is specified
175 * @skb: the buffer where the inline data should be pulled from.
176 * @data: destination buffer for the inline data.
177 * @len: amount of data which should be pulled in bytes.
179 static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data,
182 if (unlikely(!pskb_may_pull(skb, len)))
185 skb_copy_from_linear_data(skb, data, len);
191 static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
194 memcpy(*hc_ptr, data, len);
198 void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype);
201 * lowpan_header_decompress - replace 6LoWPAN header with IPv6 header
203 * This function replaces the IPHC 6LoWPAN header which should be pointed at
204 * skb->data and skb_network_header, with the IPv6 header.
205 * It would be nice that the caller have the necessary headroom of IPv6 header
206 * and greatest Transport layer header, this would reduce the overhead for
207 * reallocate headroom.
209 * @skb: the buffer which should be manipulate.
210 * @dev: the lowpan net device pointer.
211 * @daddr: destination lladdr of mac header which is used for compression
213 * @saddr: source lladdr of mac header which is used for compression
216 int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev,
217 const void *daddr, const void *saddr);
220 * lowpan_header_compress - replace IPv6 header with 6LoWPAN header
222 * This function replaces the IPv6 header which should be pointed at
223 * skb->data and skb_network_header, with the IPHC 6LoWPAN header.
224 * The caller need to be sure that the sk buffer is not shared and at have
225 * at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN,
226 * which is the IPHC "more bytes than IPv6 header" at worst case.
228 * @skb: the buffer which should be manipulate.
229 * @dev: the lowpan net device pointer.
230 * @daddr: destination lladdr of mac header which is used for compression
232 * @saddr: source lladdr of mac header which is used for compression
235 int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
236 const void *daddr, const void *saddr);
238 #endif /* __6LOWPAN_H__ */