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osd-contiki/core/net/sicslowpan.c
adamdunkels e34eb54960 A work-in-progress rework of the Contiki MAC and radio layers. The 
main ideas are:

* Separates the Contiki low-layer network stack into four layers:
  network (e.g. sicslowpan / rime), Medium Access Control MAC
  (e.g. CSMA), Radio Duty Cycling RDC (e.g. ContikiMAC, X-MAC), and
  radio (e.g. cc2420).
* Introduces a new way to configure the network stack. Four #defines
  that specify what mechanism/protocol/driver to use at the four
  layers: NETSTACK_CONF_NETWORK, NETSTACK_CONF_MAC, NETSTACK_CONF_RDC,
  NETSTACK_CONF_RADIO.
* Adds a callback mechanism to inform the MAC and network layers about
  the fate of a transmitted packet: if the packet was not possible to
  transmit, the cause of the failure is reported, and if the packets
  was successfully transmitted, the number of tries before it was
  finally transmitted is reported.
* NULL-protocols at both the MAC and RDC layers: nullmac and nullrdc,
  which can be used when MAC and RDC functionality is not needed.
* Extends the radio API with three new functions that enable more
  efficient radio duty cycling protocols: channel check, pending
  packet, and receiving packet.
* New initialization mechanism, which takes advantage of the NETSTACK
  #defines.
2010-02-18 21:48:39 +00:00

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/**
* \addtogroup sicslowpan
* @{
*/
/*
* Copyright (c) 2008, Swedish Institute of Computer Science.
* 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. 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.
*
* This file is part of the Contiki operating system.
*
* $Id: sicslowpan.c,v 1.18 2010/02/18 21:48:39 adamdunkels Exp $
*/
/**
* \file
* 6lowpan implementation (RFC4944 and draft-hui-6lowpan-hc-01)
*
* \author Adam Dunkels <adam@sics.se>
* \author Nicolas Tsiftes <nvt@sics.se>
* \author Niclas Finne <nfi@sics.se>
* \author Mathilde Durvy <mdurvy@cisco.com>
* \author Julien Abeille <jabeille@cisco.com>
*/
#include <string.h>
#include "contiki.h"
#include "dev/watchdog.h"
#include "net/tcpip.h"
#include "net/uip.h"
#include "net/uip-netif.h"
#include "net/rime.h"
#include "net/sicslowpan.h"
#include "net/netstack.h"
#define DEBUG 0
#if DEBUG
/* PRINTFI and PRINTFO are defined for input and output to debug one without changing the timing of the other */
u8_t p;
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINTFI(...) printf(__VA_ARGS__)
#define PRINTFO(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x ",lladdr->addr[0], lladdr->addr[1], lladdr->addr[2], lladdr->addr[3],lladdr->addr[4], lladdr->addr[5],lladdr->addr[6], lladdr->addr[7])
#define PRINTPACKETBUF() PRINTF("RIME buffer: "); for(p = 0; p < packetbuf_datalen(); p++){PRINTF("%.2X", *(rime_ptr + p));} PRINTF("\n")
#define PRINTUIPBUF() PRINTF("UIP buffer: "); for(p = 0; p < uip_len; p++){PRINTF("%.2X", uip_buf[p]);}PRINTF("\n")
#define PRINTSICSLOWPANBUF() PRINTF("SICSLOWPAN buffer: "); for(p = 0; p < sicslowpan_len; p++){PRINTF("%.2X", sicslowpan_buf[p]);}PRINTF("\n")
#else
#define PRINTF(...)
#define PRINTFI(...)
#define PRINTFO(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(lladdr)
#define PRINTPACKETBUF()
#define PRINTUIPBUF()
#define PRINTSICSLOWPANBUF()
#endif /* DEBUG == 1*/
#if UIP_LOGGING
#include <stdio.h>
void uip_log(char *msg);
#define UIP_LOG(m) uip_log(m)
#else
#define UIP_LOG(m)
#endif /* UIP_LOGGING == 1 */
#define GET16(ptr,index) (((uint16_t)((ptr)[index] << 8)) | ((ptr)[(index) + 1]))
#define SET16(ptr,index,value) do { \
(ptr)[index] = ((value) >> 8) & 0xff; \
(ptr)[index + 1] = (value) & 0xff; \
} while(0)
/** \name Pointers in the rime buffer
* @{
*/
/* #define RIME_FRAG_BUF ((struct sicslowpan_frag_hdr *)rime_ptr) */
#define RIME_FRAG_PTR (rime_ptr)
#define RIME_FRAG_DISPATCH_SIZE 0 /* 16 bit */
#define RIME_FRAG_TAG 2 /* 16 bit */
#define RIME_FRAG_OFFSET 4 /* 8 bit */
/* #define RIME_HC1_BUF ((struct sicslowpan_hc1_hdr *)(rime_ptr + rime_hdr_len)) */
#define RIME_HC1_PTR (rime_ptr + rime_hdr_len)
#define RIME_HC1_DISPATCH 0 /* 8 bit */
#define RIME_HC1_ENCODING 1 /* 8 bit */
#define RIME_HC1_TTL 2 /* 8 bit */
/* #define RIME_HC1_HC_UDP_BUF ((struct sicslowpan_hc1_hc_udp_hdr *)(rime_ptr + rime_hdr_len)) */
#define RIME_HC1_HC_UDP_PTR (rime_ptr + rime_hdr_len)
#define RIME_HC1_HC_UDP_DISPATCH 0 /* 8 bit */
#define RIME_HC1_HC_UDP_HC1_ENCODING 1 /* 8 bit */
#define RIME_HC1_HC_UDP_UDP_ENCODING 2 /* 8 bit */
#define RIME_HC1_HC_UDP_TTL 3 /* 8 bit */
#define RIME_HC1_HC_UDP_PORTS 4 /* 8 bit */
#define RIME_HC1_HC_UDP_CHKSUM 5 /* 16 bit */
#define RIME_IPHC_BUF ((struct sicslowpan_iphc_hdr *)(rime_ptr + rime_hdr_len))
/* #define RIME_IPHC_DISPATCH 0 /\* 8 bit *\/ */
/* #define RIME_IPHC_ENCODING1 1 /\* 8 bit *\/ */
/* #define RIME_IPHC_ENCODING2 2 /\* 8 bit *\/ */
/* #define RIME_IP_BUF ((struct uip_ip_hdr *)(rime_ptr + rime_hdr_len)) */
/** @} */
/** \name Pointers in the sicslowpan and uip buffer
* @{
*/
#define SICSLOWPAN_IP_BUF ((struct uip_ip_hdr *)&sicslowpan_buf[UIP_LLH_LEN])
#define SICSLOWPAN_UDP_BUF ((struct uip_udp_hdr *)&sicslowpan_buf[UIP_LLIPH_LEN])
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[UIP_LLIPH_LEN])
/** @} */
/** \brief Size of the 802.15.4 payload (127byte - 25 for MAC header) */
#define MAC_MAX_PAYLOAD 102
/** \name General variables
* @{
*/
/** A pointer to the mac driver */
const struct mac_driver *sicslowpan_mac;
/**
* A pointer to the rime buffer.
* We initialize it to the beginning of the rime buffer, then
* access different fields by updating the offset rime_hdr_len.
*/
static u8_t *rime_ptr;
/**
* rime_hdr_len is the total length of (the processed) 6lowpan headers
* (fragment headers, IPV6 or HC1, HC2, and HC1 and HC2 non compressed
* fields).
*/
static u8_t rime_hdr_len;
/**
* The length of the payload in the Rime buffer.
* The payload is what comes after the compressed or uncompressed
* headers (can be the IP payload if the IP header only is compressed
* or the UDP payload if the UDP header is also compressed)
*/
static u8_t rime_payload_len;
/**
* uncomp_hdr_len is the length of the headers before compression (if HC2
* is used this includes the UDP header in addition to the IP header).
*/
static u8_t uncomp_hdr_len;
/** @} */
#if SICSLOWPAN_CONF_FRAG
/** \name Fragmentation related variables
* @{
*/
/**
* The buffer used for the 6lowpan reassembly.
* This buffer contains only the IPv6 packet (no MAC header, 6lowpan, etc).
* It has a fix size as we do not use dynamic memory allocation.
*/
static u8_t sicslowpan_buf[UIP_BUFSIZE];
/** The total length of the IPv6 packet in the sicslowpan_buf. */
static u16_t sicslowpan_len;
/**
* length of the ip packet already sent / received.
* It includes IP and transport headers.
*/
static u16_t processed_ip_len;
/** Datagram tag to be put in the fragments I send. */
static u16_t my_tag;
/** When reassembling, the tag in the fragments being merged. */
static u16_t reass_tag;
/** When reassembling, the source address of the fragments being merged */
rimeaddr_t frag_sender;
/** Reassembly %process %timer. */
static struct timer reass_timer;
/** @} */
#else /* SICSLOWPAN_CONF_FRAG */
/** The buffer used for the 6lowpan processing is uip_buf.
We do not use any additional buffer.*/
#define sicslowpan_buf uip_buf
#define sicslowpan_len uip_len
#endif /* SICSLOWPAN_CONF_FRAG */
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01
/** \name HC01 specific variables
* @{
*/
/** Addresses contexts for IPHC. */
static struct sicslowpan_addr_context
addr_contexts[SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS];
/** pointer to an address context. */
static struct sicslowpan_addr_context *context;
/** pointer to the byte where to write next inline field. */
static u8_t *hc01_ptr;
/** Index for loops. */
static u8_t i;
/** @} */
/*--------------------------------------------------------------------*/
/** \name HC01 related functions
* @{ */
/*--------------------------------------------------------------------*/
/** \brief find the context corresponding to prefix ipaddr */
static struct sicslowpan_addr_context*
addr_context_lookup_by_prefix(uip_ipaddr_t *ipaddr) {
for(i = 0; i < SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS; i++) {
if((addr_contexts[i].used == 1) &&
uip_ipaddr_prefixcmp(&addr_contexts[i].prefix, ipaddr, 64)) {
return &addr_contexts[i];
}
}
return NULL;
}
/*--------------------------------------------------------------------*/
/** \brief find the context with the given number */
static struct sicslowpan_addr_context*
addr_context_lookup_by_number(u8_t number) {
for(i = 0; i < SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS; i++) {
if((addr_contexts[i].used == 1) &&
addr_contexts[i].number == number) {
return &addr_contexts[i];
}
}
return NULL;
}
/*--------------------------------------------------------------------*/
/**
* \brief 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.
*
*
* HC01 (draft-hui-6lowpan-hc, version 1)\n
*
* \note We do not support ISA100_UDP header compression
*
* For LOWPAN_UDP compression, we either compress both ports or none.
* General format with LOWPAN_UDP compression is
* \verbatim
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | HC01 Dsp | HC01 encoding | non |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | compressed IPv6 fields ..... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | LOWPAN_UDP | non compressed UDP fields ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | L4 data ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* \endverbatim
* \note The context number 00 is reserved for the link local prefix.
* For unicast addresses, if we cannot compress the prefix, we neither
* compress the IID.
* \param rime_destaddr L2 destination address, needed to compress IP
* dest
*/
/*
* Address compression logic (multicast only applies to dest):
* If multicast:
* If flags (see RFC4291 section 2.7) are all 0 AND
* the 112-bit group id is mappable to a 9-bit group
* (for now all nodes and all routers groups are
* mappable),
* we compress to 16 bits
* Else unicast:
* If we have a context for the prefix,
* we elide 64 bits prefix.
* If the IID can be inferred from lower layers,
* we elide 64 bits IID
* else
* if first 49 bits of IID are 0,
* we compress IID to 16 bits (with first = 0
* to differentiate from multicast)
*
*/
static void
compress_hdr_hc01(rimeaddr_t *rime_destaddr)
{
hc01_ptr = rime_ptr + 3;
/*
* As we copy some bit-length fields, in the IPHC encoding bytes,
* we sometimes use |=
* If the field is 0, and the current bit value in memory is 1,
* this does not work. We therefore reset the IPHC encoding here
*/
memset(RIME_IPHC_BUF->encoding, 0, 2);
/* RIME_IPHC_BUF->encoding[0] = 0; */
/* RIME_IPHC_BUF->encoding[1] = 0; */
RIME_IPHC_BUF->dispatch = SICSLOWPAN_DISPATCH_IPHC;
/*
* Version, traffic class, flow label
* If flow label is 0, compress it. If traffic class is 0, compress it
* We have to process both in the same time as the offset of traffic class
* depends on the presence of version and flow label
*/
if(((UIP_IP_BUF->tcflow & 0x0F) == 0) &&
(UIP_IP_BUF->flow == 0)) {
/* version and flow label can be compressed */
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_VF_C;
if(((UIP_IP_BUF->vtc & 0x0F) == 0) &&
((UIP_IP_BUF->tcflow & 0xF0) == 0)) {
/* compress (elide) all */
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TC_C;
} else {
/* compress only version and flow label */
*hc01_ptr = (UIP_IP_BUF->vtc << 4) |
(UIP_IP_BUF->tcflow >> 4);
hc01_ptr += 1;
}
} else {
/* version and flow label cannot be compressed */
if(((UIP_IP_BUF->vtc & 0x0F) == 0) &&
((UIP_IP_BUF->tcflow & 0xF0) == 0)) {
/* compress only traffic class */
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TC_C;
*hc01_ptr = (UIP_IP_BUF->vtc & 0xF0) |
(UIP_IP_BUF->tcflow & 0x0F);
memcpy(hc01_ptr + 1, &UIP_IP_BUF->flow, 2);
hc01_ptr += 3;
} else {
/* compress nothing */
memcpy(hc01_ptr, &UIP_IP_BUF->vtc, 4);
hc01_ptr += 4;
}
}
/* Note that the payload length is always compressed */
/* Next header. We compress it if UDP */
#if UIP_CONF_UDP
if(UIP_IP_BUF->proto == UIP_PROTO_UDP) {
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_NH_C;
} else {
#endif /*UIP_CONF_UDP*/
*hc01_ptr = UIP_IP_BUF->proto;
hc01_ptr += 1;
#if UIP_CONF_UDP
}
#endif /*UIP_CONF_UDP*/
/*
* Hop limit
* if 1: compress, encoding is 01
* if 64: compress, encoding is 10
* if 255: compress, encoding is 11
* else do not compress
*/
switch(UIP_IP_BUF->ttl) {
case 1:
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TTL_1;
break;
case 64:
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TTL_64;
break;
case 255:
RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TTL_255;
break;
default:
*hc01_ptr = UIP_IP_BUF->ttl;
hc01_ptr += 1;
break;
}
/* source address - cannot be multicast */
if((context = addr_context_lookup_by_prefix(&UIP_IP_BUF->srcipaddr))
!= NULL) {
/* elide the prefix */
RIME_IPHC_BUF->encoding[1] |= context->number << 4;
if(uip_is_addr_mac_addr_based(&UIP_IP_BUF->srcipaddr, &uip_lladdr)){
/* elide the IID */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_0;
} else {
if(sicslowpan_is_iid_16_bit_compressable(&UIP_IP_BUF->srcipaddr)){
/* compress IID to 16 bits */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_16;
memcpy(hc01_ptr, &UIP_IP_BUF->srcipaddr.u16[7], 2);
hc01_ptr += 2;
} else {
/* do not compress IID */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_64;
memcpy(hc01_ptr, &UIP_IP_BUF->srcipaddr.u16[4], 8);
hc01_ptr += 8;
}
}
} else {
/* send the full address */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_I;
memcpy(hc01_ptr, &UIP_IP_BUF->srcipaddr.u16[0], 16);
hc01_ptr += 16;
}
/* dest address*/
if(uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) {
/* Address is multicast, try to compress */
if(sicslowpan_is_mcast_addr_compressable(&UIP_IP_BUF->destipaddr)) {
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_16;
/* 3 first bits = 101 */
*hc01_ptr = SICSLOWPAN_IPHC_MCAST_RANGE;
/* bits 3-6 = scope = bits 8-11 in 128 bits address */
*hc01_ptr |= (UIP_IP_BUF->destipaddr.u8[1] & 0x0F) << 1;
/*
* bits 7 - 15 = 9-bit group
* We just copy the last byte because it works
* with currently supported groups
*/
*(hc01_ptr + 1) = UIP_IP_BUF->destipaddr.u8[15];
hc01_ptr += 2;
} else {
/* send the full address */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_I;
memcpy(hc01_ptr, &UIP_IP_BUF->destipaddr.u16[0], 16);
hc01_ptr += 16;
}
} else {
/* Address is unicast, try to compress */
if((context = addr_context_lookup_by_prefix(&UIP_IP_BUF->destipaddr)) != NULL) {
/* elide the prefix */
RIME_IPHC_BUF->encoding[1] |= context->number;
if(uip_is_addr_mac_addr_based(&UIP_IP_BUF->destipaddr, (uip_lladdr_t *)rime_destaddr)) {
/* elide the IID */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_0;
} else {
if(sicslowpan_is_iid_16_bit_compressable(&UIP_IP_BUF->destipaddr)) {
/* compress IID to 16 bits */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_16;
memcpy(hc01_ptr, &UIP_IP_BUF->destipaddr.u16[7], 2);
hc01_ptr += 2;
} else {
/* do not compress IID */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_64;
memcpy(hc01_ptr, &UIP_IP_BUF->destipaddr.u16[4], 8);
hc01_ptr += 8;
}
}
} else {
/* send the full address */
RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_I;
memcpy(hc01_ptr, &UIP_IP_BUF->destipaddr.u16[0], 16);
hc01_ptr += 16;
}
}
uncomp_hdr_len = UIP_IPH_LEN;
#if UIP_CONF_UDP
/* UDP header compression */
if(UIP_IP_BUF->proto == UIP_PROTO_UDP) {
if(HTONS(UIP_UDP_BUF->srcport) >= SICSLOWPAN_UDP_PORT_MIN &&
HTONS(UIP_UDP_BUF->srcport) < SICSLOWPAN_UDP_PORT_MAX &&
HTONS(UIP_UDP_BUF->destport) >= SICSLOWPAN_UDP_PORT_MIN &&
HTONS(UIP_UDP_BUF->destport) < SICSLOWPAN_UDP_PORT_MAX) {
/* we can compress. Copy compressed ports, full chcksum */
*hc01_ptr = SICSLOWPAN_NHC_UDP_C;
*(hc01_ptr + 1) =
(u8_t)((HTONS(UIP_UDP_BUF->srcport) -
SICSLOWPAN_UDP_PORT_MIN) << 4) +
(u8_t)((HTONS(UIP_UDP_BUF->destport) -
SICSLOWPAN_UDP_PORT_MIN));
memcpy(hc01_ptr + 2, &UIP_UDP_BUF->udpchksum, 2);
hc01_ptr += 4;
} else {
/* we cannot compress. Copy uncompressed ports, full chcksum */
*hc01_ptr = SICSLOWPAN_NHC_UDP_I;
memcpy(hc01_ptr + 1, &UIP_UDP_BUF->srcport, 4);
memcpy(hc01_ptr + 5, &UIP_UDP_BUF->udpchksum, 2);
hc01_ptr += 7;
}
uncomp_hdr_len += UIP_UDPH_LEN;
}
#endif /*UIP_CONF_UDP*/
rime_hdr_len = hc01_ptr - rime_ptr;
return;
}
/*--------------------------------------------------------------------*/
/**
* \brief Uncompress HC01 (i.e., IPHC and LOWPAN_UDP) headers and put
* them in sicslowpan_buf
*
* This function is called by the input function when the dispatch is
* HC01.
* We %process the packet in the rime buffer, uncompress the header
* fields, and copy the result in the sicslowpan buffer.
* At the end of the decompression, rime_hdr_len and uncompressed_hdr_len
* are set to the appropriate values
*
* \param ip_len 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.
*/
/* Processing Details
* - IP header
* We process the fields in their order of appearance in the normal
* IP header, with two exceptions:
* - next header: field when it is compressed: we need to reach the
* NHC encoding to know which is the next header
* - length: we need to know the length of headers in rime buffer
* (i.e. the final value of rime_hdr_len)
* - Addresses processing
* We do the same for src and dest, even though a multicast source
* address is wrong. IP layer will handle this. The logic is:
*
* Switch(compression)
* case no compression: copy full address
* case 64bit compressed address:
* find the context, copy prefix from context,
* copy IID from packet
* case all 128 bit of the address are ellided:
* find the context, copy prefix from context,
* infer IID from L2 address
* case 16 bit compressed address:
* if 1st bit = 0 (unicast case)
* copy prefix from context, then 48 zeros
* then 16 last bits from packet
* else (multicast case)
* first byte = FF, flags = 0, copy scope
* from packet, infer 112 bits group ID from
* 9 bit group id
*
* - UDP header, for LOWPAN_UDP compression
* The only trick is that we fill the length field at the end of
* the function.
*/
static void
uncompress_hdr_hc01(u16_t ip_len) {
hc01_ptr = rime_ptr + rime_hdr_len + 3;
/* Version and flow label */
if((RIME_IPHC_BUF->encoding[0] & 0x40) == 0) {
/* Version and flow label are carried inline */
if((RIME_IPHC_BUF->encoding[0] & 0x80) == 0) {
/* Traffic class is carried inline */
memcpy(&SICSLOWPAN_IP_BUF->vtc, hc01_ptr, 4);
hc01_ptr += 4;
} else {
/* Traffic class is compressed */
SICSLOWPAN_IP_BUF->vtc = 0x60;
SICSLOWPAN_IP_BUF->tcflow = *hc01_ptr & 0x0F;
memcpy(&SICSLOWPAN_IP_BUF->flow, hc01_ptr + 1, 2);
hc01_ptr += 3;
}
} else {
/* Version and flow label are compressed */
if((RIME_IPHC_BUF->encoding[0] & 0x80) == 0) {
/* Traffic class is inline */
SICSLOWPAN_IP_BUF->vtc = 0x60 | (*hc01_ptr >> 4);
SICSLOWPAN_IP_BUF->tcflow = *hc01_ptr << 4;
hc01_ptr += 1;
} else {
/* Traffic class is compressed */
SICSLOWPAN_IP_BUF->vtc = 0x60;
SICSLOWPAN_IP_BUF->tcflow = 0;
}
SICSLOWPAN_IP_BUF->flow = 0;
}
/* Next Header */
if((RIME_IPHC_BUF->encoding[0] & 0x20) == 0) {
/* Next header is carried inline */
SICSLOWPAN_IP_BUF->proto = *hc01_ptr;
hc01_ptr += 1;
}
/* Hop limit */
switch(RIME_IPHC_BUF->encoding[0] & 0x18) {
case SICSLOWPAN_IPHC_TTL_1:
SICSLOWPAN_IP_BUF->ttl = 1;
break;
case SICSLOWPAN_IPHC_TTL_64:
SICSLOWPAN_IP_BUF->ttl = 64;
break;
case SICSLOWPAN_IPHC_TTL_255:
SICSLOWPAN_IP_BUF->ttl = 255;
break;
case SICSLOWPAN_IPHC_TTL_I:
SICSLOWPAN_IP_BUF->ttl = *hc01_ptr;
hc01_ptr += 1;
break;
}
/* Source address */
context =
addr_context_lookup_by_number((RIME_IPHC_BUF->encoding[1] & 0x30) >> 4);
switch(RIME_IPHC_BUF->encoding[1] & 0xC0) {
case SICSLOWPAN_IPHC_SAM_0:
if(context == NULL) {
PRINTF("sicslowpan uncompress_hdr: error context not found\n");
return;
}
/* copy prefix from context */
memcpy(&SICSLOWPAN_IP_BUF->srcipaddr, context->prefix, 8);
/* infer IID from L2 address */
uip_netif_addr_autoconf_set(&SICSLOWPAN_IP_BUF->srcipaddr,
(uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_SENDER));
break;
case SICSLOWPAN_IPHC_SAM_16:
if((*hc01_ptr & 0x80) == 0) {
/* unicast address */
if(context == NULL) {
PRINTF("sicslowpan uncompress_hdr: error context not found\n");
return;
}
memcpy(&SICSLOWPAN_IP_BUF->srcipaddr, context->prefix, 8);
/* copy 6 NULL bytes then 2 last bytes of IID */
memset(&SICSLOWPAN_IP_BUF->srcipaddr.u8[8], 0, 6);
memcpy(&SICSLOWPAN_IP_BUF->srcipaddr.u8[14], hc01_ptr, 2);
hc01_ptr += 2;
} else {
/* multicast address check the 9-bit group-id is known */
if(sicslowpan_is_mcast_addr_decompressable(hc01_ptr)) {
SICSLOWPAN_IP_BUF->srcipaddr.u8[0] = 0xFF;
SICSLOWPAN_IP_BUF->srcipaddr.u8[1] = (*hc01_ptr >> 1) & 0x0F;
memset(&SICSLOWPAN_IP_BUF->srcipaddr.u8[2], 0, 13);
SICSLOWPAN_IP_BUF->srcipaddr.u8[15] = *(hc01_ptr + 1);
hc01_ptr += 2;
} else {
PRINTF("sicslowpan uncompress_hdr: error unknown compressed mcast address\n");
return;
}
}
break;
case SICSLOWPAN_IPHC_SAM_64:
if(context == NULL) {
PRINTF("sicslowpan uncompress_hdr: error context not found\n");
return;
}
/* copy prefix from context */
memcpy(&SICSLOWPAN_IP_BUF->srcipaddr, context->prefix, 8);
/* copy IID from packet */
memcpy(&SICSLOWPAN_IP_BUF->srcipaddr.u8[8], hc01_ptr, 8);
hc01_ptr += 8;
break;
case SICSLOWPAN_IPHC_SAM_I:
/* copy whole address from packet */
memcpy(&SICSLOWPAN_IP_BUF->srcipaddr.u8[0], hc01_ptr, 16);
hc01_ptr += 16;
break;
}
/* Destination address */
context = addr_context_lookup_by_number(RIME_IPHC_BUF->encoding[1] & 0x03);
switch(RIME_IPHC_BUF->encoding[1] & 0x0C) {
case SICSLOWPAN_IPHC_DAM_0:
if(context == NULL) {
PRINTF("sicslowpan uncompress_hdr: error context not found\n");
return;
}
/* copy prefix from context */
memcpy(&SICSLOWPAN_IP_BUF->destipaddr, context->prefix, 8);
/* infer IID from L2 address */
uip_netif_addr_autoconf_set(&SICSLOWPAN_IP_BUF->destipaddr,
(uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
break;
case SICSLOWPAN_IPHC_DAM_16:
if((*hc01_ptr & 0x80) == 0) {
/* unicast address */
if(context == NULL) {
PRINTF("sicslowpan uncompress_hdr: error context not found\n");
return;
}
memcpy(&SICSLOWPAN_IP_BUF->destipaddr, context->prefix, 8);
/* copy 6 NULL bytes then 2 last bytes of IID */
memset(&SICSLOWPAN_IP_BUF->destipaddr.u8[8], 0, 6);
memcpy(&SICSLOWPAN_IP_BUF->destipaddr.u8[14], hc01_ptr, 2);
hc01_ptr += 2;
} else {
/* multicast address check the 9-bit group-id is known */
if(sicslowpan_is_mcast_addr_decompressable(hc01_ptr)) {
SICSLOWPAN_IP_BUF->destipaddr.u8[0] = 0xFF;
SICSLOWPAN_IP_BUF->destipaddr.u8[1] = (*hc01_ptr >> 1) & 0x0F;
memset(&SICSLOWPAN_IP_BUF->destipaddr.u8[2], 0, 13);
SICSLOWPAN_IP_BUF->destipaddr.u8[15] = *(hc01_ptr + 1);
hc01_ptr += 2;
} else {
PRINTF("sicslowpan uncompress_hdr: error unknown compressed mcast address\n");
return;
}
}
break;
case SICSLOWPAN_IPHC_DAM_64:
if(context == NULL) {
PRINTF("sicslowpan uncompress_hdr: error context not found\n");
return;
}
memcpy(&SICSLOWPAN_IP_BUF->destipaddr, context->prefix, 8);
memcpy(&SICSLOWPAN_IP_BUF->destipaddr.u8[8], hc01_ptr, 8);
hc01_ptr += 8;
break;
case SICSLOWPAN_IPHC_DAM_I:
/* copy whole address from packet */
memcpy(&SICSLOWPAN_IP_BUF->destipaddr.u8[0], hc01_ptr, 16);
hc01_ptr += 16;
break;
}
uncomp_hdr_len += UIP_IPH_LEN;
/* Next header processing - continued */
if((RIME_IPHC_BUF->encoding[0] & 0x20) != 0) {
/* The next header is compressed, NHC is following */
if((*hc01_ptr & 0xFC) == SICSLOWPAN_NHC_UDP_ID) {
SICSLOWPAN_IP_BUF->proto = UIP_PROTO_UDP;
switch(*hc01_ptr) {
case SICSLOWPAN_NHC_UDP_C:
/* 1 byte for NHC, 1 byte for ports, 2 bytes chksum */
SICSLOWPAN_UDP_BUF->srcport = HTONS(SICSLOWPAN_UDP_PORT_MIN +
(*(hc01_ptr + 1) >> 4));
SICSLOWPAN_UDP_BUF->destport = HTONS(SICSLOWPAN_UDP_PORT_MIN +
((*(hc01_ptr + 1)) & 0x0F));
memcpy(&SICSLOWPAN_UDP_BUF->udpchksum, hc01_ptr + 2, 2);
hc01_ptr += 4;
break;
case SICSLOWPAN_NHC_UDP_I:
/* 1 byte for NHC, 4 byte for ports, 2 bytes chksum */
memcpy(&SICSLOWPAN_UDP_BUF->srcport, hc01_ptr + 1, 2);
memcpy(&SICSLOWPAN_UDP_BUF->destport, hc01_ptr + 3, 2);
memcpy(&SICSLOWPAN_UDP_BUF->udpchksum, hc01_ptr + 5, 2);
hc01_ptr += 7;
break;
default:
PRINTF("sicslowpan uncompress_hdr: error unsupported UDP compression\n");
return;
}
uncomp_hdr_len += UIP_UDPH_LEN;
}
}
rime_hdr_len = hc01_ptr - rime_ptr;
/* IP length field. */
if(ip_len == 0) {
/* This is not a fragmented packet */
SICSLOWPAN_IP_BUF->len[0] = 0;
SICSLOWPAN_IP_BUF->len[1] = packetbuf_datalen() - rime_hdr_len + uncomp_hdr_len - UIP_IPH_LEN;
} else {
/* This is a 1st fragment */
SICSLOWPAN_IP_BUF->len[0] = (ip_len - UIP_IPH_LEN) >> 8;
SICSLOWPAN_IP_BUF->len[1] = (ip_len - UIP_IPH_LEN) & 0x00FF;
}
/* length field in UDP header */
if(SICSLOWPAN_IP_BUF->proto == UIP_PROTO_UDP) {
memcpy(&SICSLOWPAN_UDP_BUF->udplen, &SICSLOWPAN_IP_BUF->len[0], 2);
}
return;
}
/** @} */
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01*/
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1
/*--------------------------------------------------------------------*/
/** \name HC1 compression and uncompression functions
* @{ */
/*--------------------------------------------------------------------*/
/**
* \brief 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.\n
* 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
* \verbatim
* 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|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* \endverbatim
*
* - For compressed UDP
* HC1 encoding = 11111011, HC_UDP encoding = 11100000\n
* \verbatim
* 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...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* \endverbatim
*
* \param rime_destaddr L2 destination address, needed to compress the
* IP destination field
*/
static void
compress_hdr_hc1(rimeaddr_t *rime_destaddr)
{
/*
* Check if all the assumptions for full compression
* are valid :
*/
if(UIP_IP_BUF->vtc != 0x60 ||
UIP_IP_BUF->tcflow != 0 ||
UIP_IP_BUF->flow != 0 ||
!uip_is_addr_link_local(&UIP_IP_BUF->srcipaddr) ||
!uip_is_addr_mac_addr_based(&UIP_IP_BUF->srcipaddr, &uip_lladdr) ||
!uip_is_addr_link_local(&UIP_IP_BUF->destipaddr) ||
!uip_is_addr_mac_addr_based(&UIP_IP_BUF->destipaddr,
(uip_lladdr_t *)rime_destaddr) ||
(UIP_IP_BUF->proto != UIP_PROTO_ICMP6 &&
UIP_IP_BUF->proto != UIP_PROTO_UDP &&
UIP_IP_BUF->proto != UIP_PROTO_TCP))
{
/*
* IPV6 DISPATCH
* Something cannot be compressed, use IPV6 DISPATCH,
* compress nothing, copy IPv6 header in rime buffer
*/
*rime_ptr = SICSLOWPAN_DISPATCH_IPV6;
rime_hdr_len += SICSLOWPAN_IPV6_HDR_LEN;
memcpy(rime_ptr + rime_hdr_len, UIP_IP_BUF, UIP_IPH_LEN);
rime_hdr_len += UIP_IPH_LEN;
uncomp_hdr_len += UIP_IPH_LEN;
} else {
/*
* HC1 DISPATCH
* maximum compresssion:
* All fields in the IP header but Hop Limit are elided
* If next header is UDP, we compress UDP header using HC2
*/
/* RIME_HC1_BUF->dispatch = SICSLOWPAN_DISPATCH_HC1; */
RIME_HC1_PTR[RIME_HC1_DISPATCH] = SICSLOWPAN_DISPATCH_HC1;
uncomp_hdr_len += UIP_IPH_LEN;
switch(UIP_IP_BUF->proto) {
case UIP_PROTO_ICMP6:
/* HC1 encoding and ttl */
/* RIME_HC1_BUF->encoding = 0xFC; */
RIME_HC1_PTR[RIME_HC1_ENCODING] = 0xFC;
/* RIME_HC1_BUF->ttl = UIP_IP_BUF->ttl; */
RIME_HC1_PTR[RIME_HC1_TTL] = UIP_IP_BUF->ttl;
rime_hdr_len += SICSLOWPAN_HC1_HDR_LEN;
break;
#if UIP_CONF_TCP
case UIP_PROTO_TCP:
/* HC1 encoding and ttl */
/* RIME_HC1_BUF->encoding = 0xFE; */
RIME_HC1_PTR[RIME_HC1_ENCODING] = 0xFE;
/* RIME_HC1_BUF->ttl = UIP_IP_BUF->ttl; */
RIME_HC1_PTR[RIME_HC1_TTL] = UIP_IP_BUF->ttl;
rime_hdr_len += SICSLOWPAN_HC1_HDR_LEN;
break;
#endif /* UIP_CONF_TCP */
#if UIP_CONF_UDP
case UIP_PROTO_UDP:
/*
* try to compress UDP header (we do only full compression).
* This is feasible if both src and dest ports are between
* SICSLOWPAN_UDP_PORT_MIN and SICSLOWPAN_UDP_PORT_MIN + 15
*/
PRINTF("local/remote port %u/%u\n",UIP_UDP_BUF->srcport,UIP_UDP_BUF->destport);
if(HTONS(UIP_UDP_BUF->srcport) >= SICSLOWPAN_UDP_PORT_MIN &&
HTONS(UIP_UDP_BUF->srcport) < SICSLOWPAN_UDP_PORT_MAX &&
HTONS(UIP_UDP_BUF->destport) >= SICSLOWPAN_UDP_PORT_MIN &&
HTONS(UIP_UDP_BUF->destport) < SICSLOWPAN_UDP_PORT_MAX) {
/* HC1 encoding */
/* RIME_HC1_HC_UDP_BUF->hc1_encoding = 0xFB; */
RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_HC1_ENCODING] = 0xFB;
/* HC_UDP encoding, ttl, src and dest ports, checksum */
/* RIME_HC1_HC_UDP_BUF->hc_udp_encoding = 0xE0; */
RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_UDP_ENCODING] = 0xE0;
/* RIME_HC1_HC_UDP_BUF->ttl = UIP_IP_BUF->ttl; */
RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_TTL] = UIP_IP_BUF->ttl;
/* RIME_HC1_HC_UDP_BUF->ports = (u8_t)((HTONS(UIP_UDP_BUF->srcport) - */
/* SICSLOWPAN_UDP_PORT_MIN) << 4) + */
/* (u8_t)((HTONS(UIP_UDP_BUF->destport) - SICSLOWPAN_UDP_PORT_MIN)); */
RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_PORTS] =
(u8_t)((HTONS(UIP_UDP_BUF->srcport) -
SICSLOWPAN_UDP_PORT_MIN) << 4) +
(u8_t)((HTONS(UIP_UDP_BUF->destport) - SICSLOWPAN_UDP_PORT_MIN));
/* RIME_HC1_HC_UDP_BUF->udpchksum = UIP_UDP_BUF->udpchksum; */
memcpy(&RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_CHKSUM], &UIP_UDP_BUF->udpchksum, 2);
rime_hdr_len += SICSLOWPAN_HC1_HC_UDP_HDR_LEN;
uncomp_hdr_len += UIP_UDPH_LEN;
} else {
/* HC1 encoding and ttl */
/* RIME_HC1_BUF->encoding = 0xFA; */
RIME_HC1_PTR[RIME_HC1_ENCODING] = 0xFA;
/* RIME_HC1_BUF->ttl = UIP_IP_BUF->ttl; */
RIME_HC1_PTR[RIME_HC1_TTL] = UIP_IP_BUF->ttl;
rime_hdr_len += SICSLOWPAN_HC1_HDR_LEN;
}
break;
#endif /*UIP_CONF_UDP*/
}
}
return;
}
/*--------------------------------------------------------------------*/
/**
* \brief Uncompress HC1 (and HC_UDP) headers and put them in
* sicslowpan_buf
*
* This function is called by the input function when the dispatch is
* HC1.
* We %process the packet in the rime buffer, uncompress the header
* fields, and copy the result in the sicslowpan buffer.
* At the end of the decompression, rime_hdr_len and uncompressed_hdr_len
* are set to the appropriate values
*
* \param ip_len 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.
*/
static void
uncompress_hdr_hc1(u16_t ip_len) {
/* version, traffic class, flow label */
SICSLOWPAN_IP_BUF->vtc = 0x60;
SICSLOWPAN_IP_BUF->tcflow = 0;
SICSLOWPAN_IP_BUF->flow = 0;
/* src and dest ip addresses */
uip_ip6addr(&SICSLOWPAN_IP_BUF->srcipaddr, 0xfe80, 0, 0, 0, 0, 0, 0, 0);
uip_netif_addr_autoconf_set(&SICSLOWPAN_IP_BUF->srcipaddr,
(uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_SENDER));
uip_ip6addr(&SICSLOWPAN_IP_BUF->destipaddr, 0xfe80, 0, 0, 0, 0, 0, 0, 0);
uip_netif_addr_autoconf_set(&SICSLOWPAN_IP_BUF->destipaddr,
(uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
uncomp_hdr_len += UIP_IPH_LEN;
/* Next header field */
/* switch(RIME_HC1_BUF->encoding & 0x06) { */
switch(RIME_HC1_PTR[RIME_HC1_ENCODING] & 0x06) {
case SICSLOWPAN_HC1_NH_ICMP6:
SICSLOWPAN_IP_BUF->proto = UIP_PROTO_ICMP6;
/* SICSLOWPAN_IP_BUF->ttl = RIME_HC1_BUF->ttl; */
SICSLOWPAN_IP_BUF->ttl = RIME_HC1_PTR[RIME_HC1_TTL];
rime_hdr_len += SICSLOWPAN_HC1_HDR_LEN;
break;
#if UIP_CONF_TCP
case SICSLOWPAN_HC1_NH_TCP:
SICSLOWPAN_IP_BUF->proto = UIP_PROTO_TCP;
/* SICSLOWPAN_IP_BUF->ttl = RIME_HC1_BUF->ttl; */
SICSLOWPAN_IP_BUF->ttl = RIME_HC1_PTR[RIME_HC1_TTL];
rime_hdr_len += SICSLOWPAN_HC1_HDR_LEN;
break;
#endif/* UIP_CONF_TCP */
#if UIP_CONF_UDP
case SICSLOWPAN_HC1_NH_UDP:
SICSLOWPAN_IP_BUF->proto = UIP_PROTO_UDP;
/* if(RIME_HC1_HC_UDP_BUF->hc1_encoding & 0x01) { */
if(RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_HC1_ENCODING] & 0x01) {
/* UDP header is compressed with HC_UDP */
/* if(RIME_HC1_HC_UDP_BUF->hc_udp_encoding != */
if(RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_UDP_ENCODING] !=
SICSLOWPAN_HC_UDP_ALL_C) {
PRINTF("sicslowpan (uncompress_hdr), packet not supported");
return;
}
/* IP TTL */
/* SICSLOWPAN_IP_BUF->ttl = RIME_HC1_HC_UDP_BUF->ttl; */
SICSLOWPAN_IP_BUF->ttl = RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_TTL];
/* UDP ports, len, checksum */
/* SICSLOWPAN_UDP_BUF->srcport = HTONS(SICSLOWPAN_UDP_PORT_MIN + */
/* (RIME_HC1_HC_UDP_BUF->ports >> 4)); */
SICSLOWPAN_UDP_BUF->srcport =
HTONS(SICSLOWPAN_UDP_PORT_MIN +
(RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_PORTS] >> 4));
/* SICSLOWPAN_UDP_BUF->destport = HTONS(SICSLOWPAN_UDP_PORT_MIN + */
/* (RIME_HC1_HC_UDP_BUF->ports & 0x0F)); */
SICSLOWPAN_UDP_BUF->destport =
HTONS(SICSLOWPAN_UDP_PORT_MIN +
(RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_PORTS] & 0x0F));
/* SICSLOWPAN_UDP_BUF->udpchksum = RIME_HC1_HC_UDP_BUF->udpchksum; */
memcpy(&SICSLOWPAN_UDP_BUF->udpchksum, &RIME_HC1_HC_UDP_PTR[RIME_HC1_HC_UDP_CHKSUM], 2);
uncomp_hdr_len += UIP_UDPH_LEN;
rime_hdr_len += SICSLOWPAN_HC1_HC_UDP_HDR_LEN;
} else {
rime_hdr_len += SICSLOWPAN_HC1_HDR_LEN;
}
break;
#endif/* UIP_CONF_UDP */
default:
/* this shouldn't happen, drop */
return;
}
/* IP length field. */
if(ip_len == 0) {
/* This is not a fragmented packet */
SICSLOWPAN_IP_BUF->len[0] = 0;
SICSLOWPAN_IP_BUF->len[1] = packetbuf_datalen() - rime_hdr_len + uncomp_hdr_len - UIP_IPH_LEN;
} else {
/* This is a 1st fragment */
SICSLOWPAN_IP_BUF->len[0] = (ip_len - UIP_IPH_LEN) >> 8;
SICSLOWPAN_IP_BUF->len[1] = (ip_len - UIP_IPH_LEN) & 0x00FF;
}
/* length field in UDP header */
if(SICSLOWPAN_IP_BUF->proto == UIP_PROTO_UDP) {
memcpy(&SICSLOWPAN_UDP_BUF->udplen, &SICSLOWPAN_IP_BUF->len[0], 2);
}
return;
}
/** @} */
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1*/
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_IPV6
/*--------------------------------------------------------------------*/
/** \name IPv6 dispatch "compression" function
* @{ */
/*--------------------------------------------------------------------*/
/* \brief Packets "Compression" when only IPv6 dispatch is used
*
* There is no compression in this case, all fields are sent
* inline. We just add the IPv6 dispatch byte before the packet.
* \verbatim
* 0 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | IPv6 Dsp | IPv6 header and payload ...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* \endverbatim
*/
static void
compress_hdr_ipv6(rimeaddr_t *rime_destaddr) {
*rime_ptr = SICSLOWPAN_DISPATCH_IPV6;
rime_hdr_len += SICSLOWPAN_IPV6_HDR_LEN;
memcpy(rime_ptr + rime_hdr_len, UIP_IP_BUF, UIP_IPH_LEN);
rime_hdr_len += UIP_IPH_LEN;
uncomp_hdr_len += UIP_IPH_LEN;
return;
}
/** @} */
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_IPV6*/
/*--------------------------------------------------------------------*/
/** \name Input/output functions common to all compression schemes
* @{ */
/*--------------------------------------------------------------------*/
/**
* \brief This function is called by the 6lowpan code to send out a
* packet.
* \param dest the link layer destination address of the packet
*/
static void
send_packet(rimeaddr_t *dest)
{
/* Set the link layer destination address for the packet as a
* packetbuf attribute. The MAC layer can access the destination
* address with the function packetbuf_addr(PACKETBUF_ADDR_RECEIVER).
*/
packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, dest);
/* XXX we should provide a callback function that is called when the
packet is sent. For now, we just supply a NULL pointer. */
NETSTACK_MAC.send(NULL, NULL);
/* If we are sending multiple packets in a row, we need to let the
watchdog know that we are still alive. */
watchdog_periodic();
}
/** \brief Take an IP packet and format it to be sent on an 802.15.4
* network using 6lowpan.
* \param localdest The MAC address of the destination
*
* The IP packet is initially in uip_buf. Its header is compressed
* and if necessary it is fragmented. The resulting
* packet/fragments are put in packetbuf and delivered to the 802.15.4
* MAC.
*/
static u8_t
output(uip_lladdr_t *localdest)
{
/* The MAC address of the destination of the packet */
rimeaddr_t dest;
/* init */
uncomp_hdr_len = 0;
rime_hdr_len = 0;
/* reset rime buffer */
packetbuf_clear();
rime_ptr = packetbuf_dataptr();
if(UIP_IP_BUF->proto == UIP_PROTO_TCP) {
/* packetbuf_set_attr(PACKETBUF_ATTR_PACKET_TYPE,
PACKETBUF_ATTR_PACKET_TYPE_STREAM);*/
}
/*
* The destination address will be tagged to each outbound
* packet. If the argument localdest is NULL, we are sending a
* broadcast packet.
*/
if(localdest == NULL) {
rimeaddr_copy(&dest, &rimeaddr_null);
} else {
rimeaddr_copy(&dest, (const rimeaddr_t *)localdest);
}
PRINTFO("sicslowpan output: sending packet len %d\n", uip_len);
/* Try to compress the headers */
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1
compress_hdr_hc1(&dest);
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1*/
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_IPV6
compress_hdr_ipv6(&dest);
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_IPV6*/
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01
compress_hdr_hc01(&dest);
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01*/
PRINTFO("sicslowpan output: header of len %d\n", rime_hdr_len);
if(uip_len - uncomp_hdr_len > MAC_MAX_PAYLOAD - rime_hdr_len) {
#if SICSLOWPAN_CONF_FRAG
struct queuebuf *q;
/*
* The outbound IPv6 packet is too large to fit into a single 15.4
* packet, so we fragment it into multiple packets and send them.
* The first fragment contains frag1 dispatch, then
* IPv6/HC1/HC01/HC_UDP dispatchs/headers.
* The following fragments contain only the fragn dispatch.
*/
/* Create 1st Fragment */
PRINTFO("sicslowpan output: 1rst fragment ");
/* move HC1/HC01/IPv6 header */
memmove(rime_ptr + SICSLOWPAN_FRAG1_HDR_LEN, rime_ptr, rime_hdr_len);
/*
* FRAG1 dispatch + header
* Note that the length is in units of 8 bytes
*/
/* RIME_FRAG_BUF->dispatch_size = */
/* htons((SICSLOWPAN_DISPATCH_FRAG1 << 8) | uip_len); */
SET16(RIME_FRAG_PTR, RIME_FRAG_DISPATCH_SIZE,
((SICSLOWPAN_DISPATCH_FRAG1 << 8) | uip_len));
/* RIME_FRAG_BUF->tag = htons(my_tag); */
SET16(RIME_FRAG_PTR, RIME_FRAG_TAG, my_tag);
/* Copy payload and send */
rime_hdr_len += SICSLOWPAN_FRAG1_HDR_LEN;
rime_payload_len = (MAC_MAX_PAYLOAD - rime_hdr_len) & 0xf8;
PRINTFO("(len %d, tag %d)\n", rime_payload_len, my_tag);
memcpy(rime_ptr + rime_hdr_len,
(void *)UIP_IP_BUF + uncomp_hdr_len, rime_payload_len);
packetbuf_set_datalen(rime_payload_len + rime_hdr_len);
q = queuebuf_new_from_packetbuf();
if(q == NULL) {
PRINTFO("could not allocate queuebuf for first fragment, dropping packet\n");
return 0;
}
send_packet(&dest);
queuebuf_to_packetbuf(q);
queuebuf_free(q);
q = NULL;
/* set processed_ip_len to what we already sent from the IP payload*/
processed_ip_len = rime_payload_len + uncomp_hdr_len;
/*
* Create following fragments
* Datagram tag is already in the buffer, we need to set the
* FRAGN dispatch and for each fragment, the offset
*/
rime_hdr_len = SICSLOWPAN_FRAGN_HDR_LEN;
/* RIME_FRAG_BUF->dispatch_size = */
/* htons((SICSLOWPAN_DISPATCH_FRAGN << 8) | uip_len); */
SET16(RIME_FRAG_PTR, RIME_FRAG_DISPATCH_SIZE,
((SICSLOWPAN_DISPATCH_FRAGN << 8) | uip_len));
rime_payload_len = (MAC_MAX_PAYLOAD - rime_hdr_len) & 0xf8;
while(processed_ip_len < uip_len){
PRINTFO("sicslowpan output: fragment ");
/* RIME_FRAG_BUF->offset = processed_ip_len >> 3; */
RIME_FRAG_PTR[RIME_FRAG_OFFSET] = processed_ip_len >> 3;
/* Copy payload and send */
if(uip_len - processed_ip_len < rime_payload_len){
/* last fragment */
rime_payload_len = uip_len - processed_ip_len;
}
PRINTFO("(offset %d, len %d, tag %d)\n",
processed_ip_len >> 3, rime_payload_len, my_tag);
memcpy(rime_ptr + rime_hdr_len,
(void *)UIP_IP_BUF + processed_ip_len, rime_payload_len);
packetbuf_set_datalen(rime_payload_len + rime_hdr_len);
q = queuebuf_new_from_packetbuf();
if(q == NULL) {
PRINTFO("could not allocate queuebuf, dropping fragment\n");
return 0;
}
send_packet(&dest);
queuebuf_to_packetbuf(q);
queuebuf_free(q);
q = NULL;
processed_ip_len += rime_payload_len;
}
/* end: reset global variables */
my_tag++;
processed_ip_len = 0;
#else /* SICSLOWPAN_CONF_FRAG */
PRINTFO("sicslowpan output: Packet too large to be sent without fragmentation support; dropping packet\n");
return 0;
#endif /* SICSLOWPAN_CONF_FRAG */
} else {
/*
* The packet does not need to be fragmented
* copy "payload" and send
*/
memcpy(rime_ptr + rime_hdr_len, (void *)UIP_IP_BUF + uncomp_hdr_len,
uip_len - uncomp_hdr_len);
packetbuf_set_datalen(uip_len - uncomp_hdr_len + rime_hdr_len);
send_packet(&dest);
}
return 1;
}
/*--------------------------------------------------------------------*/
/** \brief Process a received 6lowpan packet.
* \param r The MAC layer
*
* The 6lowpan packet is put in packetbuf by the MAC. If its a frag1 or
* a non-fragmented packet we first uncompress the IP header. The
* 6lowpan payload and possibly the uncompressed IP header are then
* copied in siclowpan_buf. If the IP packet is complete it is copied
* to uip_buf and the IP layer is called.
*
* \note We do not check for overlapping sicslowpan fragments
* (it is a SHALL in the RFC 4944 and should never happen)
*/
static void
input(void)
{
/* size of the IP packet (read from fragment) */
u16_t frag_size = 0;
/* offset of the fragment in the IP packet */
u8_t frag_offset = 0;
#if SICSLOWPAN_CONF_FRAG
/* tag of the fragment */
u16_t frag_tag = 0;
#endif /*SICSLOWPAN_CONF_FRAG*/
/* init */
uncomp_hdr_len = 0;
rime_hdr_len = 0;
/* The MAC puts the 15.4 payload inside the RIME data buffer */
rime_ptr = packetbuf_dataptr();
#if SICSLOWPAN_CONF_FRAG
/* if reassembly timed out, cancel it */
if(timer_expired(&reass_timer)){
sicslowpan_len = 0;
processed_ip_len = 0;
}
/*
* Since we don't support the mesh and broadcast header, the first header
* we look for is the fragmentation header
*/
/* switch((ntohs(RIME_FRAG_BUF->dispatch_size) & 0xf800) >> 8) { */
switch((GET16(RIME_FRAG_PTR, RIME_FRAG_DISPATCH_SIZE) & 0xf800) >> 8) {
case SICSLOWPAN_DISPATCH_FRAG1:
PRINTFI("sicslowpan input: FRAG1 ");
frag_offset = 0;
/* frag_size = (ntohs(RIME_FRAG_BUF->dispatch_size) & 0x07ff); */
frag_size = GET16(RIME_FRAG_PTR, RIME_FRAG_DISPATCH_SIZE) & 0x07ff;
/* frag_tag = ntohs(RIME_FRAG_BUF->tag); */
frag_tag = GET16(RIME_FRAG_PTR, RIME_FRAG_TAG);
PRINTFI("size %d, tag %d, offset %d)\n",
frag_size, frag_tag, frag_offset);
rime_hdr_len += SICSLOWPAN_FRAG1_HDR_LEN;
break;
case SICSLOWPAN_DISPATCH_FRAGN:
/*
* set offset, tag, size
* Offset is in units of 8 bytes
*/
PRINTFI("sicslowpan input: FRAGN ");
/* frag_offset = RIME_FRAG_BUF->offset; */
frag_offset = RIME_FRAG_PTR[RIME_FRAG_OFFSET];
/* frag_tag = ntohs(RIME_FRAG_BUF->tag); */
frag_tag = GET16(RIME_FRAG_PTR, RIME_FRAG_TAG);
/* frag_size = (ntohs(RIME_FRAG_BUF->dispatch_size) & 0x07ff); */
frag_size = GET16(RIME_FRAG_PTR, RIME_FRAG_DISPATCH_SIZE) & 0x07ff;
PRINTFI("size %d, tag %d, offset %d)\n",
frag_size, frag_tag, frag_offset);
rime_hdr_len += SICSLOWPAN_FRAGN_HDR_LEN;
break;
default:
break;
}
if(processed_ip_len > 0) {
/* reassembly is ongoing */
if((frag_size > 0 &&
(frag_size != sicslowpan_len ||
reass_tag != frag_tag ||
!rimeaddr_cmp(&frag_sender, packetbuf_addr(PACKETBUF_ADDR_SENDER)))) ||
frag_size == 0) {
/*
* the packet is a fragment that does not belong to the packet
* being reassembled or the packet is not a fragment.
*/
PRINTFI("sicslowpan input: Dropping 6lowpan packet that is not a fragment of the packet currently being reassembled\n");
return;
}
} else {
/*
* reassembly is off
* start it if we received a fragment
*/
if(frag_size > 0){
sicslowpan_len = frag_size;
reass_tag = frag_tag;
timer_set(&reass_timer, SICSLOWPAN_REASS_MAXAGE*CLOCK_SECOND);
PRINTFI("sicslowpan input: INIT FRAGMENTATION (len %d, tag %d)\n",
sicslowpan_len, reass_tag);
rimeaddr_copy(&frag_sender, packetbuf_addr(PACKETBUF_ADDR_SENDER));
}
}
if(rime_hdr_len == SICSLOWPAN_FRAGN_HDR_LEN) {
/* this is a FRAGN, skip the header compression dispatch section */
goto copypayload;
}
#endif /* SICSLOWPAN_CONF_FRAG */
/* Process next dispatch and headers */
/* switch(RIME_HC1_BUF->dispatch) { */
switch(RIME_HC1_PTR[RIME_HC1_DISPATCH]) {
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1
case SICSLOWPAN_DISPATCH_HC1:
PRINTFI("sicslowpan input: HC1\n");
uncompress_hdr_hc1(frag_size);
break;
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1*/
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01
case SICSLOWPAN_DISPATCH_IPHC:
PRINTFI("sicslowpan input: IPHC\n");
uncompress_hdr_hc01(frag_size);
break;
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01*/
case SICSLOWPAN_DISPATCH_IPV6:
PRINTFI("sicslowpan input: IPV6\n");
rime_hdr_len += SICSLOWPAN_IPV6_HDR_LEN;
/* Put uncompressed IP header in sicslowpan_buf. */
memcpy(SICSLOWPAN_IP_BUF, rime_ptr + rime_hdr_len, UIP_IPH_LEN);
/* Update uncomp_hdr_len and rime_hdr_len. */
rime_hdr_len += UIP_IPH_LEN;
uncomp_hdr_len += UIP_IPH_LEN;
break;
default:
/* unknown header */
/* PRINTF("sicslowpan input: unknown dispatch\n"); */
PRINTFI("sicslowpan input: unknown dispatch: %u\n",
RIME_HC1_PTR[RIME_HC1_DISPATCH]);
return;
}
#if SICSLOWPAN_CONF_FRAG
copypayload:
#endif /*SICSLOWPAN_CONF_FRAG*/
/*
* copy "payload" from the rime buffer to the sicslowpan_buf
* if this is a first fragment or not fragmented packet,
* we have already copied the compressed headers, uncomp_hdr_len
* and rime_hdr_len are non 0, frag_offset is.
* If this is a subsequent fragment, this is the contrary.
*/
rime_payload_len = packetbuf_datalen() - rime_hdr_len;
memcpy((void *)SICSLOWPAN_IP_BUF + uncomp_hdr_len + (u16_t)(frag_offset << 3), rime_ptr + rime_hdr_len, rime_payload_len);
/* update processed_ip_len if fragment, sicslowpan_len otherwise */
#if SICSLOWPAN_CONF_FRAG
if(frag_size > 0){
if(processed_ip_len == 0) {
processed_ip_len += uncomp_hdr_len;
}
processed_ip_len += rime_payload_len;
} else {
#endif /* SICSLOWPAN_CONF_FRAG */
sicslowpan_len = rime_payload_len + uncomp_hdr_len;
#if SICSLOWPAN_CONF_FRAG
}
/*
* If we have a full IP packet in sicslowpan_buf, deliver it to
* the IP stack
*/
if(processed_ip_len == 0 || (processed_ip_len == sicslowpan_len)){
PRINTFI("sicslowpan input: IP packet ready (length %d)\n",
sicslowpan_len);
memcpy((void *)UIP_IP_BUF, (void *)SICSLOWPAN_IP_BUF, sicslowpan_len);
uip_len = sicslowpan_len;
sicslowpan_len = 0;
processed_ip_len = 0;
#endif /* SICSLOWPAN_CONF_FRAG */
tcpip_input();
#if SICSLOWPAN_CONF_FRAG
}
#endif /* SICSLOWPAN_CONF_FRAG */
}
/** @} */
/*--------------------------------------------------------------------*/
/* \brief 6lowpan init function (called by the MAC layer) */
/*--------------------------------------------------------------------*/
void
sicslowpan_init(void)
{
/* remember the mac driver */
sicslowpan_mac = &NETSTACK_MAC;
/*
* Set out output function as the function to be called from uIP to
* send a packet.
*/
tcpip_set_outputfunc(output);
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01
#if SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS < 1
#error sicslowpan compression HC01 requires at least one address context.
#error Change SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS in contiki-conf.h.
#endif
/*
* Initialize the address contexts
* Context 00 is link local context
* Other contexts are NULL at init
*/
addr_contexts[0].used = 1;
addr_contexts[0].number = SICSLOWPAN_IPHC_ADDR_CONTEXT_LL;
addr_contexts[0].prefix[0] = 0xfe;
addr_contexts[0].prefix[1] = 0x80;
#if SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS > 1
addr_contexts[1].used = 1;
addr_contexts[1].number = 1;
addr_contexts[1].prefix[0] = 0xaa;
addr_contexts[1].prefix[1] = 0xaa;
for(i = 2; i < SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS; i++) {
addr_contexts[i].used = 0;
}
#endif /* SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS > 1 */
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01*/
}
/*--------------------------------------------------------------------*/
const struct mac_driver sicslowpan_driver = {
"Rime",
sicslowpan_init,
NULL,
input,
NULL,
NULL,
NULL,
};
/*--------------------------------------------------------------------*/
/** @} */
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