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1418 lines
50 KiB
C
1418 lines
50 KiB
C
/**
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* \addtogroup sicslowpan
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* @{
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*/
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/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: sicslowpan.c,v 1.4 2008/11/06 20:45:06 nvt-se Exp $
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*/
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/**
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* \file
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* 6lowpan implementation (RFC4944 and draft-hui-6lowpan-hc-01)
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*
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* \author Adam Dunkels <adam@sics.se>
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* \author Nicolas Tsiftes <nvt@sics.se>
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* \author Niclas Finne <nfi@sics.se>
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* \author Mathilde Durvy <mdurvy@cisco.com>
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* \author Julien Abeille <jabeille@cisco.com>
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*/
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#include <string.h>
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#include "net/tcpip.h"
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#include "net/uip.h"
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#include "net/uip-netif.h"
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#include "net/rime.h"
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#include "net/sicslowpan.h"
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#define DEBUG 0
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#if DEBUG
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u8_t p;
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#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])
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#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])
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#define PRINTRIMEBUF() PRINTF("RIME buffer: "); for(p = 0; p < rimebuf_datalen(); p++){PRINTF("%.2X", *(rime_ptr + p));} PRINTF("\n")
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#define PRINTUIPBUF() PRINTF("UIP buffer: "); for(p = 0; p < uip_len; p++){PRINTF("%.2X", uip_buf[p]);}PRINTF("\n")
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#define PRINTSICSLOWPANBUF() PRINTF("SICSLOWPAN buffer: "); for(p = 0; p < sicslowpan_len; p++){PRINTF("%.2X", sicslowpan_buf[p]);}PRINTF("\n")
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(lladdr)
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#define PRINTRIMEBUF()
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#define PRINTUIPBUF()
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#define PRINTSICSLOWPANBUF()
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#endif /* DEBUG == 1*/
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#if UIP_LOGGING
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#include <stdio.h>
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void uip_log(char *msg);
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#define UIP_LOG(m) uip_log(m)
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#else
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#define UIP_LOG(m)
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#endif /* UIP_LOGGING == 1 */
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/** \name Pointers in the rime buffer
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* @{
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*/
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#define RIME_FRAG_BUF ((struct sicslowpan_frag_hdr *)rime_ptr)
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#define RIME_HC1_BUF ((struct sicslowpan_hc1_hdr *)(rime_ptr + rime_hdr_len))
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#define RIME_HC1_HC_UDP_BUF ((struct sicslowpan_hc1_hc_udp_hdr *)(rime_ptr + rime_hdr_len))
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#define RIME_IP_BUF ((struct uip_ip_hdr *)(rime_ptr + rime_hdr_len))
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#define RIME_IPHC_BUF ((struct sicslowpan_iphc_hdr *)(rime_ptr + rime_hdr_len))
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/** @} */
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/** \name Pointers in the sicslowpan and uip buffer
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* @{
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*/
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#define SICSLOWPAN_IP_BUF ((struct uip_ip_hdr *)&sicslowpan_buf[UIP_LLH_LEN])
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#define SICSLOWPAN_UDP_BUF ((struct uip_udp_hdr *)&sicslowpan_buf[UIP_LLIPH_LEN])
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[UIP_LLIPH_LEN])
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/** @} */
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/** \brief Size of the 802.15.4 payload (127byte - 25 for MAC header) */
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#define MAC_MAX_PAYLOAD 102
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/** \name General variables
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* @{
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*/
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/** A pointer to the mac driver */
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static const struct mac_driver *mac;
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/**
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* A pointer to the rime buffer.
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* We initialize it to the beginning of the rime buffer, then
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* access different fields by updating the offset rime_hdr_len.
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*/
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static u8_t *rime_ptr;
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/**
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* rime_hdr_len is the total length of (the processed) 6lowpan headers
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* (fragment headers, IPV6 or HC1, HC2, and HC1 and HC2 non compressed
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* fields).
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*/
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static u8_t rime_hdr_len;
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/**
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* The length of the payload in the Rime buffer.
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* The payload is what comes after the compressed or uncompressed
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* headers (can be the IP payload if the IP header only is compressed
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* or the UDP payload if the UDP header is also compressed)
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*/
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static u8_t rime_payload_len;
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/**
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* uncomp_hdr_len is the length of the headers before compression (if HC2
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* is used this includes the UDP header in addition to the IP header).
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*/
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static u8_t uncomp_hdr_len;
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/** @} */
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#if SICSLOWPAN_CONF_FRAG
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/** \name Fragmentation related variables
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* @{
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*/
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/**
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* The buffer used for the 6lowpan reassembly.
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* This buffer contains only the IPv6 packet (no MAC header, 6lowpan, etc).
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* It has a fix size as we do not use dynamic memory allocation.
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*/
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static u8_t sicslowpan_buf[UIP_BUFSIZE];
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/** The total length of the IPv6 packet in the sicslowpan_buf. */
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static u16_t sicslowpan_len;
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/**
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* length of the ip packet already sent / received.
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* It includes IP and transport headers.
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*/
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static u16_t processed_ip_len;
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/** Datagram tag to be put in the fragments I send. */
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static u16_t my_tag;
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/** When reassembling, the tag in the fragments being merged. */
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static u16_t reass_tag;
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/** When reassembling, the source address of the fragments being merged */
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rimeaddr_t frag_sender;
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/** Reassembly %process %timer. */
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static struct timer reass_timer;
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/** @} */
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#else /* SICSLOWPAN_CONF_FRAG */
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/** The buffer used for the 6lowpan processing is uip_buf.
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We do not use any additional buffer.*/
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#define sicslowpan_buf uip_buf
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#define sicslowpan_len uip_len
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#endif /* SICSLOWPAN_CONF_FRAG */
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#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01
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/** \name HC01 specific variables
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* @{
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*/
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/** Addresses contexts for IPHC. */
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static struct sicslowpan_addr_context
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addr_contexts[SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS];
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/** pointer to an address context. */
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static struct sicslowpan_addr_context *context;
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/** pointer to the byte where to write next inline field. */
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static u8_t *hc01_ptr;
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/** Index for loops. */
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static u8_t i;
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/** @} */
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/*--------------------------------------------------------------------*/
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/** \name HC01 related functions
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* @{ */
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/*--------------------------------------------------------------------*/
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/** \brief find the context corresponding to prefix ipaddr */
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static struct sicslowpan_addr_context*
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addr_context_lookup_by_prefix(uip_ipaddr_t *ipaddr) {
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for(i = 0; i < SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS; i++) {
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if((addr_contexts[i].used == 1) &&
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uip_ipaddr_prefixcmp(&addr_contexts[i].prefix, ipaddr, 64)) {
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return &addr_contexts[i];
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}
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}
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return NULL;
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}
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/*--------------------------------------------------------------------*/
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/** \brief find the context with the given number */
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static struct sicslowpan_addr_context*
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addr_context_lookup_by_number(u8_t number) {
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for(i = 0; i < SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS; i++) {
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if((addr_contexts[i].used == 1) &&
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addr_contexts[i].number == number) {
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return &addr_contexts[i];
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}
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}
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return NULL;
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}
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/*--------------------------------------------------------------------*/
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/**
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* \brief Compress IP/UDP header
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*
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* This function is called by the 6lowpan code to create a compressed
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* 6lowpan packet in the rimebuf buffer from a full IPv6 packet in the
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* uip_buf buffer.
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*
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*
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* HC01 (draft-hui-6lowpan-hc, version 1)\n
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*
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* \note We do not support ISA100_UDP header compression
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*
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* For LOWPAN_UDP compression, we either compress both ports or none.
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* General format with LOWPAN_UDP compression is
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* \verbatim
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* 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | HC01 Dsp | HC01 encoding | non |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | compressed IPv6 fields ..... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | LOWPAN_UDP | non compressed UDP fields ... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | L4 data ... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* \endverbatim
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* \note The context number 00 is reserved for the link local prefix.
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* For unicast addresses, if we cannot compress the prefix, we neither
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* compress the IID.
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* \param rime_destaddr L2 destination address, needed to compress IP
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* dest
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*/
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/*
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* Address compression logic (multicast only applies to dest):
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* If multicast:
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* If flags (see RFC4291 section 2.7) are all 0 AND
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* the 112-bit group id is mapable to a 9-bit group
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* (for now all nodes and all routers groups are
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* mapable),
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* we compress to 16 bits
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* Else unicast:
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* If we have a context for the prefix,
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* we elide 64 bits prefix.
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* If the IID can be inferred from lower layers,
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* we elide 64 bits IID
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* else
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* if first 49 bits of IID are 0,
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* we compress IID to 16 bits (with first = 0
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* to differentiate from multicast)
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*
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*/
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static void
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compress_hdr_hc01(rimeaddr_t *rime_destaddr)
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{
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hc01_ptr = rime_ptr + 3;
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/*
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* As we copy some bit-length fields, in the IPHC encoding bytes,
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* we sometimes use |=
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* If the field is 0, and the current bit value in memory is 1,
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* this does not work. We therefore reset the IPHC encoding here
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*/
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memset(RIME_IPHC_BUF->encoding, 0, 2);
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RIME_IPHC_BUF->dispatch = SICSLOWPAN_DISPATCH_IPHC;
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/*
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* Version, traffic class, flow label
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* If flow label is 0, compress it. If traffic class is 0, compress it
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* We have to process both in the same time as the offset of traffic class
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* depends on the presence of version and flow label
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*/
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if(((UIP_IP_BUF->tcflow & 0x0F) == 0) &&
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(UIP_IP_BUF->flow == 0)) {
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/* version and flow label can be compressed */
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_VF_C;
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if(((UIP_IP_BUF->vtc & 0x0F) == 0) &&
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((UIP_IP_BUF->tcflow & 0xF0) == 0)) {
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/* compress (elide) all */
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TC_C;
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} else {
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/* compress only version and flow label */
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*hc01_ptr = (UIP_IP_BUF->vtc << 4) |
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(UIP_IP_BUF->tcflow >> 4);
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hc01_ptr += 1;
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}
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} else {
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/* version and flow label cannot be compressed */
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if(((UIP_IP_BUF->vtc & 0x0F) == 0) &&
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((UIP_IP_BUF->tcflow & 0xF0) == 0)) {
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/* compress only traffic class */
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TC_C;
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*hc01_ptr = (UIP_IP_BUF->vtc & 0xF0) |
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(UIP_IP_BUF->tcflow & 0x0F);
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memcpy(hc01_ptr + 1, &UIP_IP_BUF->flow, 2);
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hc01_ptr += 3;
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} else {
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/* compress nothing */
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memcpy(hc01_ptr, &UIP_IP_BUF->vtc, 4);
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hc01_ptr += 4;
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}
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}
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/* Note that the payload length is always compressed */
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/* Next header. We compress it if UDP */
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#if UIP_CONF_UDP
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if(UIP_IP_BUF->proto == UIP_PROTO_UDP) {
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_NH_C;
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} else {
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#endif /*UIP_CONF_UDP*/
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*hc01_ptr = UIP_IP_BUF->proto;
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hc01_ptr += 1;
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#if UIP_CONF_UDP
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}
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#endif /*UIP_CONF_UDP*/
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/*
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* Hop limit
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* if 1: compress, encoding is 01
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* if 64: compress, encoding is 10
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* if 255: compress, encoding is 11
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* else do not compress
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*/
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switch(UIP_IP_BUF->ttl) {
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case 1:
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TTL_1;
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break;
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case 64:
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TTL_64;
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break;
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case 255:
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RIME_IPHC_BUF->encoding[0] |= SICSLOWPAN_IPHC_TTL_255;
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break;
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default:
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*hc01_ptr = UIP_IP_BUF->ttl;
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hc01_ptr += 1;
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break;
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}
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/* source address - cannot be multicast */
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if((context = addr_context_lookup_by_prefix(&UIP_IP_BUF->srcipaddr))
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!= NULL) {
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/* elide the prefix */
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RIME_IPHC_BUF->encoding[1] |= context->number << 4;
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if(uip_is_addr_mac_addr_based(&UIP_IP_BUF->srcipaddr, &uip_lladdr)){
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/* elide the IID */
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RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_0;
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} else {
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if(sicslowpan_is_iid_16_bit_compressable(&UIP_IP_BUF->srcipaddr)){
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/* compress IID to 16 bits */
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RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_16;
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memcpy(hc01_ptr, &UIP_IP_BUF->srcipaddr.u16[7], 2);
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hc01_ptr += 2;
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} else {
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/* do not compress IID */
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RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_64;
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memcpy(hc01_ptr, &UIP_IP_BUF->srcipaddr.u16[4], 8);
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hc01_ptr += 8;
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}
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}
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} else {
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/* send the full address */
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RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_SAM_I;
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memcpy(hc01_ptr, &UIP_IP_BUF->srcipaddr.u16[0], 16);
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hc01_ptr += 16;
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}
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/* dest address*/
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if(uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) {
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/* Address is multicast, try to compress */
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if(sicslowpan_is_mcast_addr_compressable(&UIP_IP_BUF->destipaddr)) {
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RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_16;
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/* 3 first bits = 101 */
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*hc01_ptr = SICSLOWPAN_IPHC_MCAST_RANGE;
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/* bits 3-6 = scope = bits 8-11 in 128 bits address */
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*hc01_ptr |= (UIP_IP_BUF->destipaddr.u8[1] & 0x0F) << 1;
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/*
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* bits 7 - 15 = 9-bit group
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* We just copy the last byte because it works
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* with currently supported groups
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*/
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*(hc01_ptr + 1) = UIP_IP_BUF->destipaddr.u8[15];
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hc01_ptr += 2;
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} else {
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/* send the full address */
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RIME_IPHC_BUF->encoding[1] |= SICSLOWPAN_IPHC_DAM_I;
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memcpy(hc01_ptr, &UIP_IP_BUF->destipaddr.u16[0], 16);
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hc01_ptr += 16;
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}
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} else {
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/* Address is unicast, try to compress */
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if((context = addr_context_lookup_by_prefix(&UIP_IP_BUF->destipaddr)) != NULL) {
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/* elide the prefix */
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RIME_IPHC_BUF->encoding[1] |= context->number;
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if(uip_is_addr_mac_addr_based(&UIP_IP_BUF->destipaddr, (uip_lladdr_t *)rime_destaddr)) {
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/* elide the IID */
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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 *)rimebuf_addr(RIMEBUF_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 *)rimebuf_addr(RIMEBUF_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] = rimebuf_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 rimebuf 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;
|
|
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_BUF->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_BUF->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;
|
|
|
|
/* HC_UDP encoding, ttl, src and dest ports, checksum */
|
|
RIME_HC1_HC_UDP_BUF->hc_udp_encoding = 0xE0;
|
|
RIME_HC1_HC_UDP_BUF->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_BUF->udpchksum = UIP_UDP_BUF->udpchksum;
|
|
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_BUF->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 *)rimebuf_addr(RIMEBUF_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 *)rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
|
|
|
|
uncomp_hdr_len += UIP_IPH_LEN;
|
|
|
|
/* Next header field */
|
|
switch(RIME_HC1_BUF->encoding & 0x06) {
|
|
case SICSLOWPAN_HC1_NH_ICMP6:
|
|
SICSLOWPAN_IP_BUF->proto = UIP_PROTO_ICMP6;
|
|
SICSLOWPAN_IP_BUF->ttl = RIME_HC1_BUF->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;
|
|
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) {
|
|
/* UDP header is compressed with HC_UDP */
|
|
if(RIME_HC1_HC_UDP_BUF->hc_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;
|
|
/* UDP ports, len, checksum */
|
|
SICSLOWPAN_UDP_BUF->srcport = HTONS(SICSLOWPAN_UDP_PORT_MIN +
|
|
(RIME_HC1_HC_UDP_BUF->ports >> 4));
|
|
SICSLOWPAN_UDP_BUF->destport = HTONS(SICSLOWPAN_UDP_PORT_MIN +
|
|
(RIME_HC1_HC_UDP_BUF->ports & 0x0F));
|
|
SICSLOWPAN_UDP_BUF->udpchksum = RIME_HC1_HC_UDP_BUF->udpchksum;
|
|
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] = rimebuf_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
|
|
* rimebuf attribute. The MAC layer can access the destination
|
|
* address with the function "rimebuf_addr(RIMEBUF_ADDR_RECEIVER);
|
|
*/
|
|
rimebuf_set_addr(RIMEBUF_ADDR_RECEIVER, dest);
|
|
|
|
if(mac != NULL) {
|
|
/** \todo: Fix sending delays so they aren't blocking, or even better would
|
|
* be to figure out how to get rid of delays entirely */
|
|
mac->send();
|
|
}
|
|
}
|
|
|
|
/** \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 rimebuf 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 */
|
|
rimebuf_clear();
|
|
rime_ptr = rimebuf_dataptr();
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
PRINTF("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*/
|
|
PRINTF("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
|
|
/*
|
|
* 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 */
|
|
PRINTF("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);
|
|
RIME_FRAG_BUF->tag = htons(my_tag);
|
|
|
|
/* Copy payload and send */
|
|
rime_hdr_len += SICSLOWPAN_FRAG1_HDR_LEN;
|
|
rime_payload_len = (MAC_MAX_PAYLOAD - rime_hdr_len) & 0xf8;
|
|
PRINTF("(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);
|
|
rimebuf_set_datalen(rime_payload_len + rime_hdr_len);
|
|
send_packet(&dest);
|
|
|
|
/* 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);
|
|
rime_payload_len = (MAC_MAX_PAYLOAD - rime_hdr_len) & 0xf8;
|
|
while(processed_ip_len < uip_len){
|
|
PRINTF("sicslowpan output: fragment ");
|
|
RIME_FRAG_BUF->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;
|
|
}
|
|
PRINTF("(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);
|
|
rimebuf_set_datalen(rime_payload_len + rime_hdr_len);
|
|
send_packet(&dest);
|
|
processed_ip_len += rime_payload_len;
|
|
}
|
|
|
|
/* end: reset global variables */
|
|
my_tag++;
|
|
processed_ip_len = 0;
|
|
#else /* SICSLOWPAN_CONF_FRAG */
|
|
PRINTF("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);
|
|
rimebuf_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 rimebuf 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(const struct mac_driver *r)
|
|
{
|
|
/* 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*/
|
|
|
|
#ifdef SICSLOWPAN_CONF_CONVENTIONAL_MAC
|
|
if(r->read() <= 0) {
|
|
return;
|
|
}
|
|
#endif /* SICSLOWPAN_CONF_CONVENTIONAL_MAC */
|
|
|
|
/* init */
|
|
uncomp_hdr_len = 0;
|
|
rime_hdr_len = 0;
|
|
|
|
/* The MAC puts the 15.4 payload inside the RIME data buffer */
|
|
rime_ptr = rimebuf_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) {
|
|
case SICSLOWPAN_DISPATCH_FRAG1:
|
|
PRINTF("sicslowpan input: FRAG1 ");
|
|
frag_offset = 0;
|
|
frag_size = (ntohs(RIME_FRAG_BUF->dispatch_size) & 0x07ff);
|
|
frag_tag = ntohs(RIME_FRAG_BUF->tag);
|
|
PRINTF("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
|
|
*/
|
|
PRINTF("sicslowpan input: FRAGN ");
|
|
frag_offset = RIME_FRAG_BUF->offset;
|
|
frag_tag = ntohs(RIME_FRAG_BUF->tag);
|
|
frag_size = (ntohs(RIME_FRAG_BUF->dispatch_size) & 0x07ff);
|
|
PRINTF("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, rimebuf_addr(RIMEBUF_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.
|
|
*/
|
|
PRINTF("sicslowpan input: Dropping 6lowpan packet\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);
|
|
PRINTF("sicslowpan input: INIT FRAGMENTATION (len %d, tag %d)\n",
|
|
sicslowpan_len, reass_tag);
|
|
rimeaddr_copy(&frag_sender, rimebuf_addr(RIMEBUF_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) {
|
|
#if SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC1
|
|
case SICSLOWPAN_DISPATCH_HC1:
|
|
PRINTF("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:
|
|
PRINTF("sicslowpan input: IPHC\n");
|
|
uncompress_hdr_hc01(frag_size);
|
|
break;
|
|
#endif /*SICSLOWPAN_CONF_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01*/
|
|
case SICSLOWPAN_DISPATCH_IPV6:
|
|
PRINTF("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");
|
|
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 = rimebuf_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)){
|
|
PRINTF("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 */
|
|
return;
|
|
}
|
|
/** @} */
|
|
|
|
/*--------------------------------------------------------------------*/
|
|
/* \brief 6lowpan init function (called by the MAC layer) */
|
|
/*--------------------------------------------------------------------*/
|
|
void
|
|
sicslowpan_init(const struct mac_driver *m)
|
|
{
|
|
/* remember the mac driver */
|
|
mac = m;
|
|
|
|
/* Set our input function as the receive function of the MAC. */
|
|
mac->set_receive_function(input);
|
|
|
|
/*
|
|
* 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
|
|
/*
|
|
* 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;
|
|
|
|
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_COMPRESSION == SICSLOWPAN_CONF_COMPRESSION_HC01*/
|
|
}
|
|
/*--------------------------------------------------------------------*/
|
|
/** @} */
|