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6loWPAN: Framework to support commpress/uncompress operations.

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This commit is contained in:
Gregory Nutt 2017-03-28 12:23:19 -06:00
parent 25496936cc
commit 75a8ad636c
7 changed files with 383 additions and 2 deletions
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4
net/sixlowpan/Kconfig
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@ -121,6 +121,10 @@ config NET_6LOWPAN_MAXADDRCONTEXT_PREFIX_2_1
endif # NET_6LOWPAN_MAXADDRCONTEXT_PREINIT_0
endif # NET_6LOWPAN_COMPRESSION_HC06
config NET_6LOWPAN_RIMEADDR_SIZE
int "Rime address size"
default 2
config NET_SIXLOWPAN_MAXAGE
int "Packet reassembly timeout"
default 20

4
net/sixlowpan/Make.defs
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@ -43,6 +43,10 @@ NET_CSRCS += sixlowpan_initialize.c sixlowpan_globals.c
NET_CSRCS += sixlowpan_input.c sixlowpan_output.c
NET_CSRCS += sixlowpan_compressor.c sixlowpan_sniffer.c
ifeq ($(CONFIG_NET_6LOWPAN_COMPRESSION_HC1),y)
NET_CSRCS += sixlowpan_hc1.c
endif
ifeq ($(CONFIG_NET_6LOWPAN_COMPRESSION_HC06),y)
NET_CSRCS += sixlowpan_hc06.c
endif

143
net/sixlowpan/sixlowpan.h
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@ -45,6 +45,15 @@
#ifdef CONFIG_NET_6LOWPAN
/****************************************************************************
* Public Types
****************************************************************************/
struct rimeaddr_s
{
uint8_t u8[CONFIG_NET_6LOWPAN_RIMEADDR_SIZE];
};
/****************************************************************************
* Public Data
****************************************************************************/
@ -67,6 +76,8 @@ extern FAR struct sixlowpan_rime_sniffer_s *g_sixlowpan_sniffer;
* Public Function Prototypes
****************************************************************************/
struct net_driver_s; /* Forward reference */
/****************************************************************************
* Name: sixlowpan_initialize
*
@ -88,6 +99,26 @@ extern FAR struct sixlowpan_rime_sniffer_s *g_sixlowpan_sniffer;
void sixlowpan_initialize(void);
/****************************************************************************
* Name: sixlowpan_output
*
* Description:
* Process an outgoing UDP or TCP packet. Called from UDP/TCP logic to
* determine if the the packet should be formatted for 6loWPAN output.
*
* Input Parameters:
* dev - The IEEE802.15.4 MAC network driver interface.
*
* Returned Value:
* Ok is returned on success; Othewise a negated errno value is returned.
* This function is expected to fail if the driver is not an IEEE802.15.4
* MAC network driver. In that case, the UDP/TCP will fall back to normal
* IPv4/IPv6 formatting.
*
****************************************************************************/
int sixlowpan_output(FAR struct net_driver_s *dev);
/****************************************************************************
* Name: sixlowpan_hc06_initialize
*
@ -111,5 +142,117 @@ void sixlowpan_initialize(void);
void sixlowpan_hc06_initialize(void);
#endif
/****************************************************************************
* Name: sixlowpan_hc06_initialize
*
* Description:
* Compress IP/UDP header
*
* This function is called by the 6lowpan code to create a compressed
* 6lowpan packet in the packetbuf buffer from a full IPv6 packet in the
* uip_buf buffer.
*
* HC-06 (draft-ietf-6lowpan-hc, version 6)
* http://tools.ietf.org/html/draft-ietf-6lowpan-hc-06
*
* NOTE: sixlowpan_compresshdr_hc06() does not support ISA100_UDP header
* compression
*
* Input Parameters:
* dev - A reference to the IEE802.15.4 network device state
* destaddr - L2 destination address, needed to compress IP dest
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC06
void sixlowpan_compresshdr_hc06(FAR struct net_driver_s *dev,
FAR struct rimeaddr_s *destaddr);
#endif
/****************************************************************************
* Name: sixlowpan_hc06_initialize
*
* Description:
* Uncompress HC06 (i.e., IPHC and LOWPAN_UDP) headers and put them in
* sixlowpan_buf
*
* This function is called by the input function when the dispatch is HC06.
* We process the packet in the rime buffer, uncompress the header fields,
* and copy the result in the sixlowpan buffer. At the end of the
* decompression, g_rime_hdrlen and g_uncompressed_hdrlen are set to the
* appropriate values
*
* Input Parmeters:
* dev - A reference to the IEE802.15.4 network device state
* iplen - Equal to 0 if the packet is not a fragment (IP length is then
* inferred from the L2 length), non 0 if the packet is a 1st
* fragment.
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC06
void sixlowpan_uncompresshdr_hc06(FAR struct net_driver_s *dev,
uint16_t iplen);
#endif
/****************************************************************************
* Name: sixlowpan_compresshdr_hc1
*
* Description:
* Compress IP/UDP header using HC1 and HC_UDP
*
* This function is called by the 6lowpan code to create a compressed
* 6lowpan packet in the packetbuf buffer from a full IPv6 packet in the
* uip_buf buffer.
*
* Input Parmeters:
* dev - A reference to the IEE802.15.4 network device state
* destaddr - L2 destination address, needed to compress the IP
* destination field
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC1
void sixlowpan_compresshdr_hc1(FAR struct net_driver_s *dev,
FAR struct rimeaddr_s *destaddr);
#endif
/****************************************************************************
* Name: sixlowpan_uncompresshdr_hc1
*
* Description:
* Uncompress HC1 (and HC_UDP) headers and put them in sixlowpan_buf
*
* This function is called by the input function when the dispatch is
* HC1. It processes the packet in the rime buffer, uncompresses the
* header fields, and copies the result in the sixlowpan buffer. At the
* end of the decompression, g_rime_hdrlen and uncompressed_hdr_len
* are set to the appropriate values
*
* Input Parameters:
* dev - A reference to the IEE802.15.4 network device state
* iplen - Equal to 0 if the packet is not a fragment (IP length is then
* inferred from the L2 length), non 0 if the packet is a 1st
* fragment.
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC1
void sixlowpan_uncompresshdr_hc1(FAR struct net_driver_s *dev,
uint16_t ip_len);
#endif
#endif /* CONFIG_NET_6LOWPAN */
#endif /* _NET_SIXLOWPAN_SIXLOWPAN_H */

2
net/sixlowpan/sixlowpan_globals.c
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@ -1,5 +1,5 @@
/****************************************************************************
* net/sixlowpan/sixlowpan_sniffer.c
* net/sixlowpan/sixlowpan_globals.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>

81
net/sixlowpan/sixlowpan_hc06.c
View File

@ -57,6 +57,7 @@
#include <nuttx/config.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/sixlowpan.h>
#include "sixlowpan/sixlowpan.h"
@ -166,4 +167,84 @@ void sixlowpan_hc06_initialize(void)
#endif /* CONFIG_NET_6LOWPAN_MAXADDRCONTEXT > 0 */
}
/****************************************************************************
* Name: sixlowpan_hc06_initialize
*
* Description:
* Compress IP/UDP header
*
* This function is called by the 6lowpan code to create a compressed
* 6lowpan packet in the packetbuf buffer from a full IPv6 packet in the
* uip_buf buffer.
*
* HC-06 (draft-ietf-6lowpan-hc, version 6)
* http://tools.ietf.org/html/draft-ietf-6lowpan-hc-06
*
* NOTE: sixlowpan_compresshdr_hc06() does not support ISA100_UDP header
* compression
*
* For LOWPAN_UDP compression, we either compress both ports or none.
* General format with LOWPAN_UDP compression is
* 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |0|1|1|TF |N|HLI|C|S|SAM|M|D|DAM| SCI | DCI | comp. IPv6 hdr|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | compressed IPv6 fields ..... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | LOWPAN_UDP | non compressed UDP fields ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | L4 data ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* NOTE: The g_addr_context number 00 is reserved for the link local prefix.
* For unicast addresses, if we cannot compress the prefix, we neither
* compress the IID.
*
* Input Parameters:
* dev - A reference to the IEE802.15.4 network device state
* destaddr - L2 destination address, needed to compress IP dest
*
* Returned Value:
* None
*
****************************************************************************/
void sixlowpan_compresshdr_hc06(FAR struct net_driver_s *dev,
FAR struct rimeaddr_s *destaddr)
{
/* REVISIT: To be provided */
}
/****************************************************************************
* Name: sixlowpan_hc06_initialize
*
* Description:
* Uncompress HC06 (i.e., IPHC and LOWPAN_UDP) headers and put them in
* sixlowpan_buf
*
* This function is called by the input function when the dispatch is HC06.
* We process the packet in the rime buffer, uncompress the header fields,
* and copy the result in the sixlowpan buffer. At the end of the
* decompression, g_rime_hdrlen and g_uncompressed_hdrlen are set to the
* appropriate values
*
* Input Parmeters:
* dev - A reference to the IEE802.15.4 network device state
* iplen - Equal to 0 if the packet is not a fragment (IP length is then
* inferred from the L2 length), non 0 if the packet is a 1st
* fragment.
*
* Returned Value:
* None
*
****************************************************************************/
void sixlowpan_uncompresshdr_hc06(FAR struct net_driver_s *dev,
uint16_t iplen)
{
/* REVISIT: To be provided */
}
#endif /* CONFIG_NET_6LOWPAN_COMPRESSION_HC06 */

149
net/sixlowpan/sixlowpan_hc1.c Normal file
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@ -0,0 +1,149 @@
/****************************************************************************
* net/sixlowpan/sixlowpan_hc1.c
*
* Copyright (C) 2017, Gregory Nutt, all rights reserved
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Derives from Contiki:
*
* Copyright (c) 2008, Swedish Institute of Computer Science.
* All rights reserved.
* Authors: Adam Dunkels <adam@sics.se>
* Nicolas Tsiftes <nvt@sics.se>
* Niclas Finne <nfi@sics.se>
* Mathilde Durvy <mdurvy@cisco.com>
* Julien Abeille <jabeille@cisco.com>
* Joakim Eriksson <joakime@sics.se>
* Joel Hoglund <joel@sics.se>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/net/netdev.h>
#include "sixlowpan/sixlowpan.h"
#ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC1
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sixlowpan_compresshdr_hc1
*
* Description:
* Compress IP/UDP header using HC1 and HC_UDP
*
* This function is called by the 6lowpan code to create a compressed
* 6lowpan packet in the packetbuf buffer from a full IPv6 packet in the
* uip_buf buffer.
*
* If we can compress everything, we use HC1 dispatch, if not we use
* IPv6 dispatch. We can compress everything if:
*
* - IP version is
* - Flow label and traffic class are 0
* - Both src and dest ip addresses are link local
* - Both src and dest interface ID are recoverable from lower layer
* header
* - Next header is either ICMP, UDP or TCP
*
* Moreover, if next header is UDP, we try to compress it using HC_UDP.
* This is feasible is both ports are between F0B0 and F0B0 + 15\n\n
*
* Resulting header structure:
* - For ICMP, TCP, non compressed UDP\n
* HC1 encoding = 11111010 (UDP) 11111110 (TCP) 11111100 (ICMP)\n
* 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | LoWPAN HC1 Dsp | HC1 encoding | IPv6 Hop limit| L4 hdr + data|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* - For compressed UDP
* HC1 encoding = 11111011, HC_UDP encoding = 11100000\n
* 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | LoWPAN HC1 Dsp| HC1 encoding | HC_UDP encod.| IPv6 Hop limit|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | src p.| dst p.| UDP checksum | L4 data...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* Input Parmeters:
* dev - A reference to the IEE802.15.4 network device state
* destaddr - L2 destination address, needed to compress the IP
* destination field
*
* Returned Value:
* None
*
****************************************************************************/
void sixlowpan_compresshdr_hc1(FAR struct net_driver_s *dev,
FAR struct rimeaddr_s *destaddr)
{
/* REVISIT: To be provided */
}
/****************************************************************************
* Name: sixlowpan_uncompresshdr_hc1
*
* Description:
* Uncompress HC1 (and HC_UDP) headers and put them in sixlowpan_buf
*
* This function is called by the input function when the dispatch is
* HC1. It processes the packet in the rime buffer, uncompresses the
* header fields, and copies the result in the sixlowpan buffer. At the
* end of the decompression, g_rime_hdrlen and uncompressed_hdr_len
* are set to the appropriate values
*
* Input Parameters:
* dev - A reference to the IEE802.15.4 network device state
* iplen - Equal to 0 if the packet is not a fragment (IP length is then
* inferred from the L2 length), non 0 if the packet is a 1st
* fragment.
*
* Returned Value:
* None
*
****************************************************************************/
void sixlowpan_uncompresshdr_hc1(FAR struct net_driver_s *dev,
uint16_t iplen)
{
/* REVISIT: To be provided */
}
#endif /* CONFIG_NET_6LOWPAN_COMPRESSION_HC1 */

2
net/sixlowpan/sixlowpan_input.c
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@ -1,5 +1,5 @@
/****************************************************************************
* net/sixlowpan/sixlowpan_initialize.c
* net/sixlowpan/sixlowpan_input.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>