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nullframer.c
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1 /*
2  * Copyright (c) 2009, Swedish Institute of Computer Science.
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  */
30 
31 /**
32  * \file
33  * MAC framer that does nothing...
34  * \author
35  * Niclas Finne <nfi@sics.se>
36  * Joakim Eriksson <joakime@sics.se>
37  */
38 #include "net/mac/framer/framer.h"
39 #include "net/packetbuf.h"
40 
41 #ifdef NULLFRAMER_CONF_PARSE_802154
42 #define NULLFRAMER_PARSE_802154 NULLFRAMER_CONF_PARSE_802154
43 #else
44 /* defaults to parsing of the 802154 header as that is used for Slip-Radio */
45 #define NULLFRAMER_PARSE_802154 1
46 #endif
47 
48 /*---------------------------------------------------------------------------*/
49 static int
50 is_broadcast_addr(uint8_t mode, uint8_t *addr)
51 {
52  int i = mode == FRAME802154_SHORTADDRMODE ? 2 : 8;
53  while(i-- > 0) {
54  if(addr[i] != 0xff) {
55  return 0;
56  }
57  }
58  return 1;
59 }
60 /*---------------------------------------------------------------------------*/
61 static int
62 hdr_length(void)
63 {
64  /* never adds any header */
65  return 0;
66 }
67 /*---------------------------------------------------------------------------*/
68 static int
69 create(void)
70 {
71  /* nothing extra... */
72  return 0;
73 }
74 /*---------------------------------------------------------------------------*/
75 static int
76 parse(void)
77 {
78 #if NULLFRAMER_PARSE_802154
79  frame802154_t frame;
80  int len;
81  len = packetbuf_datalen();
82  if(frame802154_parse(packetbuf_dataptr(), len, &frame)) {
83  if(frame.fcf.dest_addr_mode) {
84  if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr)) {
85  packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, (linkaddr_t *)&frame.dest_addr);
86  }
87  }
88  packetbuf_set_addr(PACKETBUF_ADDR_SENDER, (linkaddr_t *)&frame.src_addr);
89  packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, frame.seq);
90  packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, frame.fcf.ack_required);
91  return 0;
92  }
93 #endif
94  return 0;
95 }
96 /*---------------------------------------------------------------------------*/
97 const struct framer no_framer = {
98  hdr_length,
99  create,
100  parse
101 };
void * packetbuf_dataptr(void)
Get a pointer to the data in the packetbuf.
Definition: packetbuf.c:143
uint8_t dest_addr_mode
2 bit.
Definition: frame802154.h:161
frame802154_fcf_t fcf
Frame control field.
Definition: frame802154.h:204
static uip_ds6_addr_t * addr
Pointer to a nbr cache entry.
Definition: uip-nd6.c:107
int frame802154_parse(uint8_t *data, int len, frame802154_t *pf)
Parses an input frame.
Definition: frame802154.c:500
uint8_t src_addr[8]
Source address.
Definition: frame802154.h:203
uint16_t packetbuf_datalen(void)
Get the length of the data in the packetbuf.
Definition: packetbuf.c:155
Parameters used by the frame802154_create() function.
Definition: frame802154.h:198
uint8_t seq
Sequence number.
Definition: frame802154.h:205
A MAC framer is responsible for constructing and parsing the header in MAC frames...
Header file for the Packet buffer (packetbuf) management
uint8_t dest_addr[8]
Destination address.
Definition: frame802154.h:202
uint8_t ack_required
1 bit.
Definition: frame802154.h:156