316 lines
11 KiB
C
316 lines
11 KiB
C
/**
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* \addtogroup uip6
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* @{
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*/
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/*
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* Copyright (c) 2009, 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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/**
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* \file
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* Management of extension headers for ContikiRPL.
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*
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* \author Vincent Brillault <vincent.brillault@imag.fr>,
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* Joakim Eriksson <joakime@sics.se>,
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* Niclas Finne <nfi@sics.se>,
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* Nicolas Tsiftes <nvt@sics.se>.
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*/
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#include "net/uip.h"
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#include "net/tcpip.h"
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#include "net/uip-ds6.h"
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#include "net/rpl/rpl-private.h"
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#define DEBUG DEBUG_NONE
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#include "net/uip-debug.h"
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#include <limits.h>
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define UIP_EXT_BUF ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define UIP_HBHO_BUF ((struct uip_hbho_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define UIP_HBHO_NEXT_BUF ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len + RPL_HOP_BY_HOP_LEN])
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#define UIP_EXT_HDR_OPT_BUF ((struct uip_ext_hdr_opt *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
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#define UIP_EXT_HDR_OPT_PADN_BUF ((struct uip_ext_hdr_opt_padn *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
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#define UIP_EXT_HDR_OPT_RPL_BUF ((struct uip_ext_hdr_opt_rpl *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
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/*---------------------------------------------------------------------------*/
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int
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rpl_verify_header(int uip_ext_opt_offset)
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{
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rpl_instance_t *instance;
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int down;
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uint8_t sender_closer;
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if(UIP_EXT_HDR_OPT_RPL_BUF->opt_len != RPL_HDR_OPT_LEN) {
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PRINTF("RPL: Bad header option! (wrong length)\n");
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return 1;
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}
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if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_FWD_ERR) {
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PRINTF("RPL: Forward error!\n");
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/* We should try to repair it, not implemented for the moment */
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return 2;
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}
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instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
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if(instance == NULL) {
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PRINTF("RPL: Unknown instance: %u\n",
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UIP_EXT_HDR_OPT_RPL_BUF->instance);
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return 1;
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}
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if(!instance->current_dag->joined) {
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PRINTF("RPL: No DAG in the instance\n");
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return 1;
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}
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down = 0;
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if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_DOWN) {
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down = 1;
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}
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sender_closer = UIP_EXT_HDR_OPT_RPL_BUF->senderrank < instance->current_dag->rank;
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PRINTF("RPL: Packet going %s, sender closer %d (%d < %d)\n", down == 1 ? "down" : "up",
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sender_closer,
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UIP_EXT_HDR_OPT_RPL_BUF->senderrank,
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instance->current_dag->rank
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);
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if((down && !sender_closer) || (!down && sender_closer)) {
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PRINTF("RPL: Loop detected - senderrank: %d my-rank: %d sender_closer: %d\n",
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UIP_EXT_HDR_OPT_RPL_BUF->senderrank, instance->current_dag->rank,
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sender_closer);
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if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_RANK_ERR) {
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PRINTF("RPL: Rank error signalled in RPL option!\n");
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/* We should try to repair it, not implemented for the moment */
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return 3;
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}
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PRINTF("RPL: Single error tolerated\n");
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UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_RANK_ERR;
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return 0;
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}
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PRINTF("RPL: Rank OK\n");
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_rpl_opt(unsigned uip_ext_opt_offset)
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{
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uint8_t temp_len;
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memmove(UIP_HBHO_NEXT_BUF, UIP_EXT_BUF, uip_len - UIP_IPH_LEN);
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memset(UIP_HBHO_BUF, 0, RPL_HOP_BY_HOP_LEN);
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UIP_HBHO_BUF->next = UIP_IP_BUF->proto;
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UIP_IP_BUF->proto = UIP_PROTO_HBHO;
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UIP_HBHO_BUF->len = RPL_HOP_BY_HOP_LEN - 8;
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UIP_EXT_HDR_OPT_RPL_BUF->opt_type = UIP_EXT_HDR_OPT_RPL;
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UIP_EXT_HDR_OPT_RPL_BUF->opt_len = RPL_HDR_OPT_LEN;
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UIP_EXT_HDR_OPT_RPL_BUF->flags = 0;
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UIP_EXT_HDR_OPT_RPL_BUF->instance = 0;
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UIP_EXT_HDR_OPT_RPL_BUF->senderrank = 0;
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uip_len += RPL_HOP_BY_HOP_LEN;
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temp_len = UIP_IP_BUF->len[1];
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UIP_IP_BUF->len[1] += UIP_HBHO_BUF->len + 8;
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if(UIP_IP_BUF->len[1] < temp_len) {
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UIP_IP_BUF->len[0]++;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_update_header_empty(void)
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{
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rpl_instance_t *instance;
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int uip_ext_opt_offset;
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int last_uip_ext_len;
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last_uip_ext_len = uip_ext_len;
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uip_ext_len = 0;
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uip_ext_opt_offset = 2;
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PRINTF("RPL: Verifying the presence of the RPL header option\n");
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switch(UIP_IP_BUF->proto) {
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case UIP_PROTO_HBHO:
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if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
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PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
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uip_ext_len = last_uip_ext_len;
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return;
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}
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instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
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if(instance == NULL || !instance->used || !instance->current_dag->joined) {
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PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect instance\n");
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return;
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}
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break;
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default:
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PRINTF("RPL: No hop-by-hop option found, creating it\n");
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if(uip_len + RPL_HOP_BY_HOP_LEN > UIP_BUFSIZE) {
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PRINTF("RPL: Packet too long: impossible to add hop-by-hop option\n");
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uip_ext_len = last_uip_ext_len;
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return;
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}
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set_rpl_opt(uip_ext_opt_offset);
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uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN;
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return;
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}
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switch(UIP_EXT_HDR_OPT_BUF->type) {
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case UIP_EXT_HDR_OPT_RPL:
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PRINTF("RPL: Updating RPL option\n");
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UIP_EXT_HDR_OPT_RPL_BUF->senderrank = instance->current_dag->rank;
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/* Set the down extension flag correctly as described in Section
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11.2 of RFC6550. If the packet progresses along a DAO route,
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the down flag should be set. */
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if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
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/* No route was found, so this packet will go towards the RPL
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root. If so, we should not set the down flag. */
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UIP_EXT_HDR_OPT_RPL_BUF->flags &= ~RPL_HDR_OPT_DOWN;
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} else {
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/* A DAO route was found so we set the down flag. */
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UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_DOWN;
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}
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uip_ext_len = last_uip_ext_len;
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return;
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default:
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PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
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uip_ext_len = last_uip_ext_len;
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return;
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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rpl_update_header_final(uip_ipaddr_t *addr)
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{
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rpl_parent_t *parent;
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int uip_ext_opt_offset;
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int last_uip_ext_len;
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last_uip_ext_len = uip_ext_len;
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uip_ext_len = 0;
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uip_ext_opt_offset = 2;
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if(UIP_IP_BUF->proto == UIP_PROTO_HBHO) {
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if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
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PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
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uip_ext_len = last_uip_ext_len;
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return 0;
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}
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if(UIP_EXT_HDR_OPT_BUF->type == UIP_EXT_HDR_OPT_RPL) {
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if(UIP_EXT_HDR_OPT_RPL_BUF->senderrank == 0) {
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PRINTF("RPL: Updating RPL option\n");
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if(default_instance == NULL || !default_instance->used || !default_instance->current_dag->joined) {
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PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect default instance\n");
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return 1;
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}
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parent = rpl_find_parent(default_instance->current_dag, addr);
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if(parent == NULL || parent != parent->dag->preferred_parent) {
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UIP_EXT_HDR_OPT_RPL_BUF->flags = RPL_HDR_OPT_DOWN;
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}
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UIP_EXT_HDR_OPT_RPL_BUF->instance = default_instance->instance_id;
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UIP_EXT_HDR_OPT_RPL_BUF->senderrank = default_instance->current_dag->rank;
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uip_ext_len = last_uip_ext_len;
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}
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_remove_header(void)
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{
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int last_uip_ext_len;
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uint8_t temp_len;
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last_uip_ext_len = uip_ext_len;
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uip_ext_len = 0;
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PRINTF("RPL: Verifying the presence of the RPL header option\n");
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switch(UIP_IP_BUF->proto){
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case UIP_PROTO_HBHO:
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PRINTF("RPL: Removing the RPL header option\n");
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UIP_IP_BUF->proto = UIP_HBHO_BUF->next;
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temp_len = UIP_IP_BUF->len[1];
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uip_len -= UIP_HBHO_BUF->len + 8;
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UIP_IP_BUF->len[1] -= UIP_HBHO_BUF->len + 8;
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if(UIP_IP_BUF->len[1] > temp_len) {
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UIP_IP_BUF->len[0]--;
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}
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memmove(UIP_EXT_BUF, UIP_HBHO_NEXT_BUF, uip_len - UIP_IPH_LEN);
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break;
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default:
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PRINTF("RPL: No hop-by-hop Option found\n");
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}
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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rpl_invert_header(void)
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{
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uint8_t uip_ext_opt_offset;
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uint8_t last_uip_ext_len;
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last_uip_ext_len = uip_ext_len;
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uip_ext_len = 0;
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uip_ext_opt_offset = 2;
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PRINTF("RPL: Verifying the presence of the RPL header option\n");
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switch(UIP_IP_BUF->proto) {
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case UIP_PROTO_HBHO:
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break;
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default:
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PRINTF("RPL: No hop-by-hop Option found\n");
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uip_ext_len = last_uip_ext_len;
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return 0;
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}
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switch (UIP_EXT_HDR_OPT_BUF->type) {
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case UIP_EXT_HDR_OPT_RPL:
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PRINTF("RPL: Updating RPL option (switching direction)\n");
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UIP_EXT_HDR_OPT_RPL_BUF->flags &= RPL_HDR_OPT_DOWN;
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UIP_EXT_HDR_OPT_RPL_BUF->flags ^= RPL_HDR_OPT_DOWN;
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UIP_EXT_HDR_OPT_RPL_BUF->senderrank = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance)->current_dag->rank;
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uip_ext_len = last_uip_ext_len;
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return RPL_HOP_BY_HOP_LEN;
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default:
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PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
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uip_ext_len = last_uip_ext_len;
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return 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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