Contiki-NG
ccm-star-packetbuf.c
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1 /*
2  * Copyright (c) 2013, Hasso-Plattner-Institut.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the Institute nor the names of its contributors
14  * may be used to endorse or promote products derived from this software
15  * without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * This file is part of the Contiki operating system.
30  *
31  */
32 
33 /**
34  * \file
35  * CCM* convenience functions for LLSEC use
36  * \author
37  * Justin King-Lacroix <justin.kinglacroix@gmail.com>
38  * Konrad Krentz <konrad.krentz@gmail.com>
39  */
40 
41 #include "net/linkaddr.h"
42 #include "net/packetbuf.h"
43 #include "net/mac/llsec802154.h"
44 #include <string.h>
45 
46 #if LLSEC802154_USES_AUX_HEADER && LLSEC802154_USES_FRAME_COUNTER
47 
48 /*---------------------------------------------------------------------------*/
49 static const uint8_t *
50 get_extended_address(const linkaddr_t *addr)
51 #if LINKADDR_SIZE == 2
52 {
53  /* workaround for short addresses: derive EUI64 as in RFC 6282 */
54  static linkaddr_extended_t template = { { 0x00 , 0x00 , 0x00 ,
55  0xFF , 0xFE , 0x00 , 0x00 , 0x00 } };
56  template.u16[3] = LLSEC802154_HTONS(addr->u16);
57 
58  return template.u8;
59 }
60 #else /* LINKADDR_SIZE == 2 */
61 {
62  return addr->u8;
63 }
64 #endif /* LINKADDR_SIZE == 2 */
65 /*---------------------------------------------------------------------------*/
66 void
67 ccm_star_packetbuf_set_nonce(uint8_t *nonce, int forward)
68 {
69  const linkaddr_t *source_addr;
70 
71  source_addr = forward ? &linkaddr_node_addr : packetbuf_addr(PACKETBUF_ADDR_SENDER);
72  memcpy(nonce, get_extended_address(source_addr), 8);
73  nonce[8] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) >> 8;
74  nonce[9] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3) & 0xff;
75  nonce[10] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) >> 8;
76  nonce[11] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1) & 0xff;
77  nonce[12] = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
78 }
79 /*---------------------------------------------------------------------------*/
80 #endif /* LLSEC802154_USES_AUX_HEADER && LLSEC802154_USES_FRAME_COUNTER */
static uip_ds6_addr_t * addr
Pointer to a nbr cache entry.
Definition: uip-nd6.c:107
Header file for the link-layer address representation
Common functionality of 802.15.4-compliant llsec_drivers.
linkaddr_t linkaddr_node_addr
The link-layer address of the node.
Definition: linkaddr.c:48
Header file for the Packet buffer (packetbuf) management