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Added a RFC7668 netif.

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Works as expected, but some features are not implemented yet.

(See patch #9364: RFC7668 - 6lowpan over Bluetooth Low Energy -- a new netif)
(I've change the file names only; sg)

Signed-off-by: goldsimon <goldsimon@gmx.de>
This commit is contained in:
Benjamin Aigner 2017-05-29 18:26:36 +02:00 committed by goldsimon
parent f595445ec0
commit 10209ee788
4 changed files with 1134 additions and 0 deletions
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69
src/include/netif/lowpan6_ble.h Normal file
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@ -0,0 +1,69 @@
/**
* @file
* 6LowPAN over BLE for IPv6 (RFC7668).
*/
/*
* Copyright (c) 2017 Benjamin Aigner
* Copyright (c) 2015 Inico Technologies Ltd. , Author: Ivan Delamer <delamer@inicotech.com>
*
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* Author: Benjamin Aigner <aignerb@technikum-wien.at>
*
* Based on the original 6lowpan implementation of lwIP ( @see 6lowpan.c)
*/
#ifndef LWIP_HDR_RFC7668_H
#define LWIP_HDR_RFC7668_H
#include "netif/lowpan6_ble_opts.h"
#if LWIP_IPV6 && LWIP_RFC7668 /* don't build if not configured for use in lwipopts.h */
#include "lwip/pbuf.h"
#include "lwip/ip.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#ifdef __cplusplus
extern "C" {
#endif
err_t rfc7668_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr);
err_t rfc7668_input(struct pbuf * p, struct netif *netif, const ip6_addr_t *src);
err_t rfc7668_if_init(struct netif *netif);
void ble_addr_to_eui64(uint8_t *dst, uint8_t *src, uint8_t public_addr);
void eui64_to_ble_addr(uint8_t *dst, uint8_t *src);
#ifdef __cplusplus
}
#endif
#endif /* LWIP_IPV6 && LWIP_RFC7668 */
#endif /* LWIP_HDR_RFC7668_H */

85
src/include/netif/lowpan6_ble_opts.h Normal file
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@ -0,0 +1,85 @@
/**
* @file
* 6LowPAN over BLE for IPv6 (RFC7668). Config file
*/
/*
* Copyright (c) 2017 Benjamin Aigner
* Copyright (c) 2015 Inico Technologies Ltd. , Author: Ivan Delamer <delamer@inicotech.com>
*
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* Author: Benjamin Aigner <aignerb@technikum-wien.at>
*
* Based on the original 6lowpan implementation of lwIP ( @see 6lowpan.c)
*/
#ifndef LWIP_HDR_RFC7668_OPTS_H
#define LWIP_HDR_RFC7668_OPTS_H
#include "lwip/opt.h"
/** LWIP_RFC7668==1: Enable the RFC7668 netif.*/
#ifndef LWIP_RFC7668
#define LWIP_RFC7668 1
#endif
/** LWIP_RFC7668_NUM_CONTEXTS: define the number of compression
* contexts.
* CURRENTLY NOT SUPPORTED. */
#ifndef LWIP_RFC7668_NUM_CONTEXTS
#define LWIP_RFC7668_NUM_CONTEXTS 10
#endif
/** LWIP_RFC7668_DEBUG: Enable generic debugging in rfc7668.c. */
#ifndef LWIP_RFC7668_DEBUG
#define LWIP_RFC7668_DEBUG LWIP_DBG_ON
#endif
/** LWIP_RFC7668_IP_COMPRESSED_DEBUG: enable compressed IP frame
* output debugging */
#ifndef LWIP_RFC7668_IP_COMPRESSED_DEBUG
#define LWIP_RFC7668_IP_COMPRESSED_DEBUG LWIP_DBG_OFF
#endif
/** LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG: enable decompressed IP frame
* output debugging */
#ifndef LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG
#define LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG LWIP_DBG_OFF
#endif
/** LWIP_RFC7668_DECOMPRESSION_DEBUG: enable decompression debug output*/
#ifndef LWIP_RFC7668_DECOMPRESSION_DEBUG
#define LWIP_RFC7668_DECOMPRESSION_DEBUG LWIP_DBG_OFF
#endif
/** LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS:
* Currently, the linux kernel driver for 6lowpan sets/clears a bit in
* the address, depending on the BD address (either public or not).
* Might not be RFC7668 conform, so you may select to do that (=1) or
* not (=0) */
#define LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS 1
#endif /* LWIP_HDR_RFC7668_OPTS_H */

4
src/netif/FILES
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@ -8,6 +8,10 @@ ethernet.c
lowpan6.c
A 6LoWPAN implementation as a netif.
lowpan6_ble.c
A 6LoWPAN over Bluetooth Low Energy (BLE) implementation as netif,
according to RFC-7668.
slipif.c
A generic implementation of the SLIP (Serial Line IP)
protocol. It requires a sio (serial I/O) module to work.

976
src/netif/lowpan6_ble.c Normal file
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@ -0,0 +1,976 @@
/**
* @file
* 6LowPAN over BLE output for IPv6 (RFC7668).
*/
/*
* Copyright (c) 2017 Benjamin Aigner
* Copyright (c) 2015 Inico Technologies Ltd. , Author: Ivan Delamer <delamer@inicotech.com>
*
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* Author: Benjamin Aigner <aignerb@technikum-wien.at>
*
* Based on the original 6lowpan implementation of lwIP ( @see 6lowpan.c)
*/
/**
* @defgroup rfc7668if RFC7668 - 6LoWPAN over BLE netif
* @ingroup netifs
* This file implements a RFC7668 implementation for 6LoWPAN over
* Bluetooth Low Energy. The specification is very similar to 6LoWPAN,
* so most of the code is re-used.
* Compared to 6LoWPAN, much functionality is already implemented in
* lower BLE layers (fragmenting, session management,...).
*
* Usage:
* - add this netif
* - don't add IPv4 addresses (no IPv4 support in RFC7668), pass 'NULL','NULL','NULL'
* - use the BLE to EUI64 conversation util to create an IPv6 link-local address from the BLE MAC ( @see ble_addr_to_eui64)
* - input function: @see rfc7668_input
* - set the link output function, which transmits output data to an established L2CAP channel
* - If data arrives (HCI event "L2CAP_DATA_PACKET"):
* - allocate a @see PBUF_RAW buffer
* - let the pbuf struct point to the incoming data or copy it to the buffer
* - call netif->input
*
* @todo:
* - further testing
* - support compression contexts
* - support multiple addresses
* - support multicast
* - support neighbor discovery
*/
#include "netif/lowpan6_ble.h"
#if LWIP_IPV6 && LWIP_RFC7668
#include "lwip/ip.h"
#include "lwip/pbuf.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/nd6.h"
#include "lwip/mem.h"
#include "lwip/udp.h"
#include "lwip/tcpip.h"
#include "lwip/snmp.h"
#include <string.h>
#if LWIP_RFC7668_NUM_CONTEXTS > 0
/** context memory, containing IPv6 addresses */
static ip6_addr_t rfc7668_context[LWIP_RFC7668_NUM_CONTEXTS];
#endif
err_t tcpip_rfc7668_input(struct pbuf *p, struct netif *inp);
err_t rfc7668_set_context(u8_t index, const ip6_addr_t * context);
/** convert BT address to EUI64 addr
*
* This method converts a Bluetooth MAC address to an EUI64 address,
* which is used within IPv6 communication
*
* @param dst IPv6 destination space
* @param src BLE MAC address source
* @param public_addr If the LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS
* option is set, bit 0x02 will be set if param=0 (no public addr); cleared otherwise
*
* @see LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS
*/
void ble_addr_to_eui64(uint8_t *dst, uint8_t *src, uint8_t public_addr)
{
/* according to RFC7668 ch 3.2.2. */
memcpy(dst, src, 3);
dst[3] = 0xFF;
dst[4] = 0xFE;
memcpy(&dst[5], &src[3], 3);
#if LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS
if(public_addr) dst[0] &= ~0x02;
else dst[0] |= 0x02;
#endif
}
/** convert EUI64 address to Bluetooth MAC addr
*
* This method converts an EUI64 address to a Bluetooth MAC address,
*
* @param src IPv6 source
* @param dst BLE MAC address destination
*
*/
void eui64_to_ble_addr(uint8_t *dst, uint8_t *src)
{
/* according to RFC7668 ch 3.2.2. */
memcpy(dst,src,3);
memcpy(&dst[3],&src[5],3);
}
/** context lookup; find context ID for IPv6 address
*
* @param Pointer to IPv6 address struct
*
* @return The context id, if one found; -1 if no context id found
*/
static s8_t
rfc7668_context_lookup(const ip6_addr_t *ip6addr)
{
#if LWIP_RFC7668_NUM_CONTEXTS > 0
s8_t i;
/* iterate over all possible context addresses */
for (i = 0; i < LWIP_RFC7668_NUM_CONTEXTS; i++) {
/* if a match is found, return id */
if (ip6_addr_netcmp(&rfc7668_context[i], ip6addr)) {
return i;
}
}
#endif
/* no address found, return -1 */
return -1;
}
/** Determine unicast address compression mode
*
* NOT IMPLEMENTED. This method will determine if an address should
* be compressed either context-based or stateless.
*
* @see rfc7668_get_address_mode_mc
*
* @param Pointer to IPv6 address struct
*
* @return Currently not defined...
*/
static s8_t
rfc7668_get_address_mode(const ip6_addr_t *ip6addr)
{
/* @todo implement the compression mode determination */
/* just return 1, means stateless compression */
return 1;
}
/** Determine multicast address compression mode
*
* NOT IMPLEMENTED. This method will determine if an address should
* be compressed either context-based or stateless.
*
* @see rfc7668_get_address_mode_mc
*
* @param Pointer to IPv6 address struct
*
* @return Currently not defined...
*/
static s8_t
rfc7668_get_address_mode_mc(const ip6_addr_t *ip6addr)
{
/* @todo implement the compression mode determination */
/* just return 0, no multicast compression */
return 0;
}
/** Encapsulate IPv6 frames for BLE transmission
*
* This method implements the IPv6 header compression:
* *) According to RFC6282
* *) See Figure 2, contains base format of bit positions
* *) Fragmentation not necessary (done at L2CAP layer of BLE)
* @note Currently the pbuf allocation uses 256 bytes. If longer packets are used (possible due to MTU=1480Bytes), increase it here!
*
* @param dst Pointer to IPv6 address struct (destination)
* @param src Pointer to IPv6 address struct (source)
* @param p Pbuf struct, containing the payload data
* @param netif Output network interface. Should be of RFC7668 type
*
* @return Same as netif->output.
*/
static err_t
rfc7668_frag(struct netif *netif, struct pbuf *p, const ip6_addr_t * src, const ip6_addr_t *dst)
{
struct pbuf * p_frag;
u16_t frag_len, remaining_len;
u8_t * buffer;
u8_t lowpan6_header_len;
s8_t i;
static u8_t frame_seq_num;
static u16_t datagram_tag;
u16_t datagram_offset;
err_t err = ERR_IF;
/* We'll use a dedicated pbuf for building BLE fragments. */
p_frag = pbuf_alloc(PBUF_RAW, 256, PBUF_RAM);
if (p_frag == NULL) {
MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
return ERR_MEM;
}
/* Write IP6 header (with IPHC). */
buffer = (u8_t*)p_frag->payload;
/* Perform IPv6 header compression according to RFC 6282 NECESSARY!*/
{
struct ip6_hdr *ip6hdr;
/* Point to ip6 header and align copies of src/dest addresses. */
ip6hdr = (struct ip6_hdr *)p->payload;
ip_addr_copy_from_ip6(ip_data.current_iphdr_dest, ip6hdr->dest);
ip_addr_copy_from_ip6(ip_data.current_iphdr_src, ip6hdr->src);
/* Basic length of 6LowPAN header, set dispatch and clear fields. */
lowpan6_header_len = 2;
buffer[0] = 0x60;
buffer[1] = 0;
/* Determine whether there will be a Context Identifier Extension byte or not.
* If so, set it already. */
#if LWIP_RFC7668_NUM_CONTEXTS > 0
buffer[2] = 0;
i = rfc7668_context_lookup(ip_2_ip6(&ip_data.current_iphdr_src));
if (i >= 0) {
/* Stateful source address compression. */
buffer[1] |= 0x40;
buffer[2] |= (i & 0x0f) << 4;
}
i = rfc7668_context_lookup(ip_2_ip6(&ip_data.current_iphdr_dest));
if (i >= 0) {
/* Stateful destination address compression. */
buffer[1] |= 0x04;
buffer[2] |= i & 0x0f;
}
if (buffer[2] != 0x00) {
/* Context identifier extension byte is appended. */
buffer[1] |= 0x80;
lowpan6_header_len++;
}
#endif /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
/* Determine TF field: Traffic Class, Flow Label */
if (IP6H_FL(ip6hdr) == 0) {
/* Flow label is elided. */
buffer[0] |= 0x10;
if (IP6H_TC(ip6hdr) == 0) {
/* Traffic class (ECN+DSCP) elided too. */
buffer[0] |= 0x08;
} else {
/* Traffic class (ECN+DSCP) appended. */
buffer[lowpan6_header_len++] = IP6H_TC(ip6hdr);
}
} else {
if (((IP6H_TC(ip6hdr) & 0x3f) == 0)) {
/* DSCP portion of Traffic Class is elided, ECN and FL are appended (3 bytes) */
buffer[0] |= 0x08;
buffer[lowpan6_header_len] = IP6H_TC(ip6hdr) & 0xc0;
buffer[lowpan6_header_len++] |= (IP6H_FL(ip6hdr) >> 16) & 0x0f;
buffer[lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
buffer[lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
} else {
/* Traffic class and flow label are appended (4 bytes) */
buffer[lowpan6_header_len++] = IP6H_TC(ip6hdr);
buffer[lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 16) & 0x0f;
buffer[lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
buffer[lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
}
}
/* Compress NH?
* Only if UDP for now. @todo support other NH compression. */
if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
buffer[0] |= 0x04;
} else {
/* append nexth. */
buffer[lowpan6_header_len++] = IP6H_NEXTH(ip6hdr);
}
/* Compress hop limit? */
if (IP6H_HOPLIM(ip6hdr) == 255) {
buffer[0] |= 0x03;
} else if (IP6H_HOPLIM(ip6hdr) == 64) {
buffer[0] |= 0x02;
} else if (IP6H_HOPLIM(ip6hdr) == 1) {
buffer[0] |= 0x01;
} else {
/* append hop limit */
buffer[lowpan6_header_len++] = IP6H_HOPLIM(ip6hdr);
}
/* Compress source address */
if (((buffer[1] & 0x40) != 0) ||
(ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_src)))) {
/* Context-based or link-local source address compression. */
i = rfc7668_get_address_mode(src);
buffer[1] |= (i & 0x03) << 4;
if (i == 1) {
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 16, 8);
lowpan6_header_len += 8;
} else if (i == 2) {
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 22, 2);
lowpan6_header_len += 2;
}
} else if (ip6_addr_isany(ip_2_ip6(&ip_data.current_iphdr_src))) {
/* Special case: mark SAC and leave SAM=0 */
buffer[1] |= 0x40;
} else {
/* Append full address. */
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 8, 16);
lowpan6_header_len += 16;
}
/* Compress destination address */
if (ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_dest))) {
/* @todo support stateful multicast address compression */
buffer[1] |= 0x08;
i = rfc7668_get_address_mode_mc(ip_2_ip6(&ip_data.current_iphdr_dest));
buffer[1] |= i & 0x03;
if (i == 0) {
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 24, 16);
lowpan6_header_len += 16;
} else if (i == 1) {
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[25];
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 35, 5);
lowpan6_header_len += 5;
} else if (i == 2) {
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[25];
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 37, 3);
lowpan6_header_len += 3;
} else if (i == 3) {
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[39];
}
} else if (((buffer[1] & 0x04) != 0) ||
(ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_dest)))) {
/* Context-based or link-local destination address compression. */
i = rfc7668_get_address_mode(dst);
buffer[1] |= i & 0x03;
if (i == 1) {
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 32, 8);
lowpan6_header_len += 8;
} else if (i == 2) {
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 38, 2);
lowpan6_header_len += 2;
}
} else {
/* Append full address. */
MEMCPY(buffer + lowpan6_header_len, (u8_t*)p->payload + 24, 16);
lowpan6_header_len += 16;
}
/* Move to payload. */
pbuf_header(p, -IP6_HLEN);
/* Compress UDP header? */
if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
/* @todo support optional checksum compression */
buffer[lowpan6_header_len] = 0xf0;
/* determine port compression mode. */
if ((((u8_t *)p->payload)[0] == 0xf0) && ((((u8_t *)p->payload)[1] & 0xf0) == 0xb0) &&
(((u8_t *)p->payload)[2] == 0xf0) && ((((u8_t *)p->payload)[3] & 0xf0) == 0xb0)) {
/* Compress source and dest ports. */
buffer[lowpan6_header_len++] |= 0x03;
buffer[lowpan6_header_len++] = ((((u8_t *)p->payload)[1] & 0x0f) << 4) | (((u8_t *)p->payload)[3] & 0x0f);
} else if (((u8_t *)p->payload)[0] == 0xf0) {
/* Compress source port. */
buffer[lowpan6_header_len++] |= 0x02;
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[1];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[2];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[3];
} else if (((u8_t *)p->payload)[2] == 0xf0) {
/* Compress dest port. */
buffer[lowpan6_header_len++] |= 0x01;
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[0];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[1];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[3];
} else {
/* append full ports. */
lowpan6_header_len++;
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[0];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[1];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[2];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[3];
}
/* elide length and copy checksum */
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[6];
buffer[lowpan6_header_len++] = ((u8_t *)p->payload)[7];
pbuf_header(p, -UDP_HLEN);
}
}
/* Calculate remaining packet length */
remaining_len = p->tot_len;
/* It fits in one frame. */
frag_len = remaining_len;
/* Copy IPv6 packet */
pbuf_copy_partial(p, buffer + lowpan6_header_len, frag_len, 0);
remaining_len = 0;
/* Calculate frame length */
p_frag->len = p_frag->tot_len = frag_len + lowpan6_header_len;
/* send the packet */
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_DBG_TRACE, ("rfc7668_send: sending packet %p\n", (void *)p));
err = netif->linkoutput(netif, p_frag);
pbuf_free(p_frag);
return err;
}
/**
* Set context id IPv6 address
*
* Store one IPv6 address to a given context id.
*
* @param idx Context id
* @param context IPv6 addr for this context
*
* @return ERR_OK (if everything is fine), ERR_ARG (if the context id is out of range), ERR_VAL (if contexts disabled)
*/
err_t
rfc7668_set_context(u8_t idx, const ip6_addr_t * context)
{
#if LWIP_RFC7668_NUM_CONTEXTS > 0
/* check if the ID is possible */
if (idx >= LWIP_RFC7668_NUM_CONTEXTS) {
return ERR_ARG;
}
/* copy IPv6 address to context storage */
ip6_addr_set(&rfc7668_context[idx], context);
return ERR_OK;
#else
return ERR_VAL;
#endif
}
/**
* Resolve and fill-in IEEE 802.15.4 address header for outgoing IPv6 packet.
*
* Perform Header Compression and fragment if necessary.
*
* @param netif The lwIP network interface which the IP packet will be sent on.
* @param q The pbuf(s) containing the IP packet to be sent.
* @param ip6addr The IP address of the packet destination.
*
* @return See rfc7668_frag
*/
err_t
rfc7668_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
{
return rfc7668_frag(netif, q, (ip6_addr_t *)netif->ip6_addr, ip6addr);
}
/**
* Resolve the IPv6 address & metrics (NH, hops,...) from the compressed header
*
* Perform Header Deompression.
*
* @param p The pbuf containing the IP packet to be decompressed.
* @param dest The IP address of the packet destination.
* @param src The IP address of the packet source.
*
* @return pbuf pointer of the processed packet
*/
static struct pbuf *
rfc7668_decompress(struct pbuf * p, const ip6_addr_t * src, const ip6_addr_t * dest)
{
struct pbuf * q;
u16_t j;
/* temp variable, ease up debug output/processing */
u32_t header_temp;
u8_t * lowpan6_buffer;
s8_t lowpan6_offset;
struct ip6_hdr *ip6hdr;
s8_t ip6_offset = IP6_HLEN;
/* allocate a new pbuf for the decompressed IPv6 packet */
q = pbuf_alloc(PBUF_IP, p->len + IP6_HLEN + UDP_HLEN, PBUF_POOL);
if (q == NULL) {
LWIP_DEBUGF(LWIP_DBG_ON,("Out of memory, discarding!!!\n"));
pbuf_free(p);
return NULL;
}
/* set buffer pointer to payload */
lowpan6_buffer = (u8_t *)p->payload;
/* set pointer for new ip6 header */
ip6hdr = (struct ip6_hdr *)q->payload;
/* output the full compressed packet, if set in @see rfc7668_opt.h */
#if LWIP_RFC7668_IP_COMPRESSED_DEBUG
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_IP_COMPRESSED_DEBUG,("IP6 payload(compressed): \n"));
for(j = 0; j<p->len;j++)
{
if((j%4)==0) LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_IP_COMPRESSED_DEBUG,("\n"));
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_IP_COMPRESSED_DEBUG,("%2X ",*((uint8_t *)p->payload+j)));
}
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_IP_COMPRESSED_DEBUG,("\np->len: %d",p->len));
printf("\np->len: %d\n",p->len);
#endif
/* offset for inline IP headers (RFC 6282 ch3)*/
lowpan6_offset = 2;
/* if CID is set (context identifier), the context byte
* follows immediately after the header, so other IPHC fields are @+3 */
if (lowpan6_buffer[1] & 0x80) {
lowpan6_offset++;
}
/* Set IPv6 version, traffic class and flow label. (RFC6282, ch 3.1.1.)*/
if ((lowpan6_buffer[0] & 0x18) == 0x00) {
header_temp = ((lowpan6_buffer[lowpan6_offset+1] & 0x0f) << 16) | \
(lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset+3];
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("TF: 00, ECN: 0x%2x, Flowlabel+DSCP: 0x%8X\n", \
lowpan6_buffer[lowpan6_offset],header_temp));
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], header_temp);
/* increase offset, processed 4 bytes here:
* TF=00: ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)*/
lowpan6_offset += 4;
} else if ((lowpan6_buffer[0] & 0x18) == 0x08) {
header_temp = ((lowpan6_buffer[lowpan6_offset] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset+2];
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("TF: 01, ECN: 0x%2x, Flowlabel: 0x%2X, DSCP ignored\n", \
lowpan6_buffer[lowpan6_offset] & 0xc0,header_temp));
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset] & 0xc0, header_temp);
/* increase offset, processed 3 bytes here:
* TF=01: ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided.*/
lowpan6_offset += 3;
} else if ((lowpan6_buffer[0] & 0x18) == 0x10) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("TF: 10, DCSP+ECN: 0x%2x, Flowlabel ignored\n",lowpan6_buffer[lowpan6_offset]));
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset],0);
/* increase offset, processed 1 byte here:
* ECN + DSCP (1 byte), Flow Label is elided.*/
lowpan6_offset += 1;
} else if ((lowpan6_buffer[0] & 0x18) == 0x18) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("TF: 11, DCSP/ECN & Flowlabel ignored\n"));
/* don't increase offset, no bytes processed here */
IP6H_VTCFL_SET(ip6hdr, 6, 0, 0);
}
/* Set Next Header (NH)
* 0: full next header byte carried inline (increase offset)*/
if ((lowpan6_buffer[0] & 0x04) == 0x00) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("NH: 0x%2X\n",lowpan6_buffer[lowpan6_offset+1]));
IP6H_NEXTH_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
/* 1: NH compression, LOWPAN_NHC (RFC6282, ch 4.1) */
} else {
/* We should fill this later with NHC decoding */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("NH: skipped, later done with NHC\n"));
IP6H_NEXTH_SET(ip6hdr, 0);
}
/* Set Hop Limit, either carried inline or 3 different hops (1,64,255) */
if ((lowpan6_buffer[0] & 0x03) == 0x00) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("Hops: full value: %d\n",lowpan6_buffer[lowpan6_offset+1]));
IP6H_HOPLIM_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
} else if ((lowpan6_buffer[0] & 0x03) == 0x01) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("Hops: compressed: 1\n"));
IP6H_HOPLIM_SET(ip6hdr, 1);
} else if ((lowpan6_buffer[0] & 0x03) == 0x02) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("Hops: compressed: 64\n"));
IP6H_HOPLIM_SET(ip6hdr, 64);
} else if ((lowpan6_buffer[0] & 0x03) == 0x03) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("Hops: compressed: 255\n"));
IP6H_HOPLIM_SET(ip6hdr, 255);
}
/* Source address decoding. */
/* Source address compression (SAC) = 0 -> stateless compression */
if ((lowpan6_buffer[1] & 0x40) == 0x00) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAC == 0, no context byte\n"));
/* Stateless compression */
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 00, no src compression, fetching 128bits inline\n"));
/* copy full address, increase offset by 16 Bytes */
MEMCPY(&ip6hdr->src.addr[0], lowpan6_buffer + lowpan6_offset, 16);
lowpan6_offset += 16;
} else if ((lowpan6_buffer[1] & 0x30) == 0x10) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 01, src compression, 64bits inline\n"));
/* set 64 bits to link local */
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
ip6hdr->src.addr[1] = 0;
/* copy 8 Bytes, increase offset */
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
lowpan6_offset += 8;
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 10, src compression, 16bits inline\n"));
/* set 96 bits to link local */
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
ip6hdr->src.addr[1] = 0;
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
/* extract remaining 16bits from inline bytes, increase offset */
ip6hdr->src.addr[3] = htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) |
lowpan6_buffer[lowpan6_offset+1]);
lowpan6_offset += 2;
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 11, src compression, 0bits inline, using other headers\n"));
/* no information avalaible, using other layers, see RFC6282 ch 3.2.2 */
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
ip6hdr->src.addr[1] = 0;
MEMCPY(&ip6hdr->src.addr[2], (uint8_t *)src->addr, 8);
}
/* Source address compression (SAC) = 1 -> stateful/context-based compression */
} else {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAC == 1, additional context byte\n"));
/* Stateful compression */
/* SAM=00, address=> :: (ANY) */
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
/* ANY address */
ip6hdr->src.addr[0] = 0;
ip6hdr->src.addr[1] = 0;
ip6hdr->src.addr[2] = 0;
ip6hdr->src.addr[3] = 0;
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 00, context compression, ANY (::)\n"));
} else {
/* Set prefix from context info */
if (lowpan6_buffer[1] & 0x80) {
j = (lowpan6_buffer[2] >> 4) & 0x0f;
} else {
j = 0;
}
if (j >= LWIP_RFC7668_NUM_CONTEXTS) {
/* Error, not possible (context id too high) */
pbuf_free(p);
pbuf_free(q);
return NULL;
}
/* load prefix from context storage */
ip6hdr->src.addr[0] = rfc7668_context[j].addr[0];
ip6hdr->src.addr[1] = rfc7668_context[j].addr[1];
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == xx, context compression found @%d: %8X, %8X\n", j, ip6hdr->src.addr[0], ip6hdr->src.addr[1]));
}
/* determine further address bits */
/* SAM=01, load additional 64bits */
if ((lowpan6_buffer[1] & 0x30) == 0x10) {
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 01, context compression, 64bits inline\n"));
lowpan6_offset += 8;
/* SAM=01, load additional 16bits */
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
ip6hdr->src.addr[3] = htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset+1]);
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 10, context compression, 16bits inline\n"));
lowpan6_offset += 2;
/* SAM=11, address is fully elided, load from other layers */
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("SAM == 11, context compression, 0bits inline, using other headers\n"));
/* no information avalaible, using other layers, see RFC6282 ch 3.2.2 */
}
}
/* Destination address + Multicast decoding. */
if (lowpan6_buffer[1] & 0x08) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("M=1: multicast\n"));
/* Multicast destination */
if (lowpan6_buffer[1] & 0x04) {
LWIP_DEBUGF(LWIP_DBG_ON,("DAC == 1, context multicast: unsupported!!!\n"));
/* @todo support stateful multicast addressing */
pbuf_free(p);
pbuf_free(q);
return NULL;
} else {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAC == 0, stateless multicast\n"));
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
/* DAM = 00, copy full address (128bits) */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 00, no dst compression, fetching 128bits inline"));
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
lowpan6_offset += 16;
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
/* DAM = 01, copy 4 bytes (32bits) */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 01, dst address form (48bits): ffXX::00XX:XXXX:XXXX\n"));
ip6hdr->dest.addr[0] = htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16));
ip6hdr->dest.addr[1] = 0;
ip6hdr->dest.addr[2] = htonl(lowpan6_buffer[lowpan6_offset++]);
ip6hdr->dest.addr[3] = htonl((lowpan6_buffer[lowpan6_offset] << 24) | (lowpan6_buffer[lowpan6_offset + 1] << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset + 3]);
lowpan6_offset += 4;
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
/* DAM = 10, copy 3 bytes (24bits) */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 10, dst address form (32bits): ffXX::00XX:XXXX\n"));
ip6hdr->dest.addr[0] = htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++]<<16));
ip6hdr->dest.addr[1] = 0;
ip6hdr->dest.addr[2] = 0;
ip6hdr->dest.addr[3] = htonl((lowpan6_buffer[lowpan6_offset] << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset + 2]);
lowpan6_offset += 3;
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
/* DAM = 11, copy 1 byte (8bits) */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 11, dst address form (8bits): ff02::00XX\n"));
ip6hdr->dest.addr[0] = PP_HTONL(0xff020000UL);
ip6hdr->dest.addr[1] = 0;
ip6hdr->dest.addr[2] = 0;
ip6hdr->dest.addr[3] = htonl(lowpan6_buffer[lowpan6_offset++]);
}
}
} else {
/* no Multicast (M=0) */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("M=0: no multicast\n"));
if (lowpan6_buffer[1] & 0x04) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAC == 1, stateful compression\n"));
/* Stateful destination compression */
/* Set prefix from context info */
if (lowpan6_buffer[1] & 0x80) {
j = lowpan6_buffer[2] & 0x0f;
} else {
j = 0;
}
if (j >= LWIP_RFC7668_NUM_CONTEXTS) {
/* Error, context id not found */
pbuf_free(p);
pbuf_free(q);
return NULL;
}
ip6hdr->dest.addr[0] = rfc7668_context[j].addr[0];
ip6hdr->dest.addr[1] = rfc7668_context[j].addr[1];
} else {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAC == 0, stateless compression, setting link local prefix\n"));
/* Link local address compression */
ip6hdr->dest.addr[0] = PP_HTONL(0xfe800000UL);
ip6hdr->dest.addr[1] = 0;
}
/* M=0, DAC=0, determining destination address length via DAM=xx */
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 00, no dst compression, fetching 128bits inline"));
/* DAM=00, copy full address */
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
lowpan6_offset += 16;
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 01, dst compression, 64bits inline\n"));
/* DAM=01, copy 64 inline bits, increase offset */
MEMCPY(&ip6hdr->dest.addr[2], lowpan6_buffer + lowpan6_offset, 8);
lowpan6_offset += 8;
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 01, dst compression, 16bits inline\n"));
/* DAM=10, copy 16 inline bits, increase offset */
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
ip6hdr->dest.addr[3] = htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset + 1]);
lowpan6_offset += 2;
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
/* DAM=11, no bits available, use other headers (not done here) */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("DAM == 01, dst compression, 0bits inline, using other headers\n"));
}
}
/* Next Header Compression (NHC) decoding? */
if (lowpan6_buffer[0] & 0x04) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("NHC decoding\n"));
/* NHC: UDP */
if ((lowpan6_buffer[lowpan6_offset] & 0xf8) == 0xf0) {
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("NHC: UDP\n"));
struct udp_hdr *udphdr;
/* UDP compression */
IP6H_NEXTH_SET(ip6hdr, IP6_NEXTH_UDP);
udphdr = (struct udp_hdr *)((u8_t *)q->payload + ip6_offset);
/* Checksum decompression */
if (lowpan6_buffer[lowpan6_offset] & 0x04) {
/* @todo support checksum decompress */
LWIP_DEBUGF(LWIP_DBG_ON,("NHC: UDP chechsum decompression UNSUPPORTED\n"));
pbuf_free(p);
pbuf_free(q);
return NULL;
}
/* Decompress ports, according to RFC4944 */
j = lowpan6_buffer[lowpan6_offset++] & 0x03;
if (j == 0) {
udphdr->src = htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
udphdr->dest = htons(lowpan6_buffer[lowpan6_offset + 2] << 8 | lowpan6_buffer[lowpan6_offset + 3]);
lowpan6_offset += 4;
} else if (j == 0x01) {
udphdr->src = htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
udphdr->dest = htons(0xf000 | lowpan6_buffer[lowpan6_offset + 2]);
lowpan6_offset += 3;
} else if (j == 0x02) {
udphdr->src = htons(0xf000 | lowpan6_buffer[lowpan6_offset]);
udphdr->dest = htons(lowpan6_buffer[lowpan6_offset + 1] << 8 | lowpan6_buffer[lowpan6_offset + 2]);
lowpan6_offset += 3;
} else if (j == 0x03) {
udphdr->src = htons(0xf0b0 | ((lowpan6_buffer[lowpan6_offset] >> 4) & 0x0f));
udphdr->dest = htons(0xf0b0 | (lowpan6_buffer[lowpan6_offset] & 0x0f));
lowpan6_offset += 1;
}
udphdr->chksum = htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
lowpan6_offset += 2;
udphdr->len = htons(p->tot_len - lowpan6_offset + UDP_HLEN);
ip6_offset += UDP_HLEN;
} else {
LWIP_DEBUGF(LWIP_DBG_ON,("NHC: unsupported protocol!\n"));
/* @todo support NHC other than UDP */
pbuf_free(p);
pbuf_free(q);
return NULL;
}
}
/* Now we copy leftover contents from p to q, so we have all L2 and L3 headers (and L4?) in a single PBUF.
* Replace p with q, and free p */
LWIP_DEBUGF(LWIP_RFC7668_DEBUG|LWIP_RFC7668_DECOMPRESSION_DEBUG,("IPHC decompression completed, copying remains (%d bytes)\n",p->len-lowpan6_offset));
MEMCPY((u8_t*)q->payload + ip6_offset, p->payload+lowpan6_offset, p->len-lowpan6_offset);
q->len = q->tot_len = ip6_offset + p->len - lowpan6_offset;
if (p->next != NULL) {
pbuf_cat(q, p->next);
}
p->next = NULL;
pbuf_free(p);
/* Infer IPv6 payload length for header */
IP6H_PLEN_SET(ip6hdr, q->tot_len - IP6_HLEN);
/* all done */
return q;
}
/**
* Process a received raw payload from an L2CAP channel
*
* @param p the received packet, p->payload pointing to the
* IPv6 header (maybe compressed)
* @param netif the network interface on which the packet was received
*
* @param src Source address of this packet
*
* @return ERR_OK if everything was fine
*/
err_t
rfc7668_input(struct pbuf * p, struct netif *netif, const ip6_addr_t *src)
{
u8_t * puc;
u16_t i;
ip6_addr_t dest;
MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len);
/* Load first header byte */
puc = (u8_t*)p->payload;
/* no IP header compression */
if (*puc == 0x41) {
LWIP_DEBUGF(LWIP_RFC7668_DECOMPRESSION_DEBUG | LWIP_RFC7668_DEBUG, ("Completed packet, removing dispatch: 0x%2x \n", *puc));
/* This is a complete IPv6 packet, just skip header byte. */
pbuf_header(p, -1);
/* IPHC header compression */
} else if ((*puc & 0xe0 )== 0x60) {
LWIP_DEBUGF(LWIP_RFC7668_DECOMPRESSION_DEBUG | LWIP_RFC7668_DEBUG, ("Completed packet, decompress dispatch: 0x%2x \n", *puc));
/* IPv6 headers are compressed using IPHC. */
p = rfc7668_decompress(p, src, &dest);
/* if no pbuf is returned, handle as discarded packet */
if (p == NULL) {
MIB2_STATS_NETIF_INC(netif, ifindiscards);
return ERR_OK;
}
/* invalid header byte, discard */
} else {
LWIP_DEBUGF(LWIP_RFC7668_DECOMPRESSION_DEBUG | LWIP_RFC7668_DEBUG, ("Completed packet, discarding: 0x%2x \n", *puc));
MIB2_STATS_NETIF_INC(netif, ifindiscards);
pbuf_free(p);
return ERR_OK;
}
/* @todo: distinguish unicast/multicast */
MIB2_STATS_NETIF_INC(netif, ifinucastpkts);
#if LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG==LWIP_DBG_ON
LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG | LWIP_RFC7668_DEBUG, ("IPv6 payload:\n"));
for(i = 0; i<p->len;i++)
{
if((i%4)==0) LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG | LWIP_RFC7668_DEBUG, ("\n"));
LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG | LWIP_RFC7668_DEBUG, ("%2X ", *((uint8_t *)p->payload+i)));
}
LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG | LWIP_RFC7668_DEBUG, ("\np->len: %d\n", p->len));
#endif
/* pass data to ip6_input */
return ip6_input(p, netif);
}
/**
* Initialize the netif
*
* No flags are used (broadcast not possible, not ethernet, ...)
* The shortname for this netif is "BT"
*
* @param netif the network interface to be initialized as RFC7668 netif
*
* @return ERR_OK if everything went fine
*/
err_t
rfc7668_if_init(struct netif *netif)
{
netif->name[0] = 'B';
netif->name[1] = 'T';
/* if compiled with LWIP_IPV4 -> set IPv4 output to NULL */
#if LWIP_IPV4
netif->output = NULL;
#endif
/* local function as IPv6 output */
netif->output_ip6 = rfc7668_output;
MIB2_INIT_NETIF(netif, snmp_ifType_other, 0);
/* maximum transfer unit, set according to RFC7668 ch2.4 */
netif->mtu = 1280;
/* no flags set (no broadcast, ethernet,...)*/
netif->flags = 0;
/* everything fine */
return ERR_OK;
}
/**
* Pass a received packet to tcpip_thread for input processing
*
* @param p the received packet, p->payload pointing to the
* IEEE 802.15.4 header.
* @param inp the network interface on which the packet was received
*
* @return @see tcpip_inpkt , same return values
*/
err_t
tcpip_rfc7668_input(struct pbuf *p, struct netif *inp)
{
/* send data to upper layer, return the result */
return tcpip_inpkt(p, inp, rfc7668_input);
}
#endif /* LWIP_IPV6 && LWIP_6LOWPAN */