734 lines
24 KiB
C
734 lines
24 KiB
C
/*
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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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/**
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* \addtogroup uip6
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* @{
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*/
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#include "net/ip/uip.h"
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#include "net/ip/tcpip.h"
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#include "net/ipv6/uip-ds6.h"
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#include "net/rpl/rpl-private.h"
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#include "net/rpl/rpl-ns.h"
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#include "net/packetbuf.h"
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#define DEBUG DEBUG_NONE
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#include "net/ip/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_RH_BUF ((struct uip_routing_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define UIP_RPL_SRH_BUF ((struct uip_rpl_srh_hdr *)&uip_buf[uip_l2_l3_hdr_len + RPL_RH_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_hbh_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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uint16_t sender_rank;
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uint8_t sender_closer;
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uip_ds6_route_t *route;
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rpl_parent_t *sender = NULL;
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if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
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PRINTF("RPL: Hop-by-hop extension header has wrong size\n");
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return 1;
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}
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if(UIP_EXT_HDR_OPT_RPL_BUF->opt_type != UIP_EXT_HDR_OPT_RPL) {
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PRINTF("RPL: Non RPL Hop-by-hop option\n");
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return 1;
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}
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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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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(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 by removing the neighbor that caused
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the packet to be forwareded in the first place. We drop any
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routes that go through the neighbor that sent the packet to
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us. */
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if(RPL_IS_STORING(instance)) {
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route = uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr);
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if(route != NULL) {
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uip_ds6_route_rm(route);
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}
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}
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RPL_STAT(rpl_stats.forward_errors++);
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/* Trigger DAO retransmission */
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rpl_reset_dio_timer(instance);
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/* drop the packet as it is not routable */
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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_rank = UIP_HTONS(UIP_EXT_HDR_OPT_RPL_BUF->senderrank);
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sender = nbr_table_get_from_lladdr(rpl_parents, packetbuf_addr(PACKETBUF_ADDR_SENDER));
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if(sender != NULL && (UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_RANK_ERR)) {
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/* A rank error was signalled, attempt to repair it by updating
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* the sender's rank from ext header */
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sender->rank = sender_rank;
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rpl_select_dag(instance, sender);
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}
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sender_closer = sender_rank < 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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sender_rank,
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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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sender_rank, instance->current_dag->rank,
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sender_closer);
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/* Attempt to repair the loop by sending a unicast DIO back to the sender
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* so that it gets a fresh update of our rank. */
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if(sender != NULL) {
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instance->unicast_dio_target = sender;
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rpl_schedule_unicast_dio_immediately(instance);
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}
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if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_RANK_ERR) {
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RPL_STAT(rpl_stats.loop_errors++);
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PRINTF("RPL: Rank error signalled in RPL option!\n");
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/* Packet must be dropped and dio trickle timer reset, see RFC6550 - 11.2.2.2 */
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rpl_reset_dio_timer(instance);
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return 1;
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}
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PRINTF("RPL: Single error tolerated\n");
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RPL_STAT(rpl_stats.loop_warnings++);
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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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#if RPL_WITH_NON_STORING
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int
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rpl_srh_get_next_hop(uip_ipaddr_t *ipaddr)
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{
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uint8_t *uip_next_hdr;
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int last_uip_ext_len = uip_ext_len;
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uip_ext_len = 0;
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uip_next_hdr = &UIP_IP_BUF->proto;
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/* Look for routing header */
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while(uip_next_hdr != NULL && *uip_next_hdr != UIP_PROTO_ROUTING) {
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switch(*uip_next_hdr) {
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case UIP_PROTO_TCP:
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case UIP_PROTO_UDP:
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case UIP_PROTO_ICMP6:
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case UIP_PROTO_NONE:
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uip_next_hdr = NULL;
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break;
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case UIP_PROTO_HBHO:
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case UIP_PROTO_DESTO:
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case UIP_PROTO_FRAG:
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/* Move to next header */
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if(uip_next_hdr != &UIP_IP_BUF->proto) {
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uip_ext_len += (UIP_EXT_BUF->len << 3) + 8;
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}
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uip_next_hdr = &UIP_EXT_BUF->next;
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break;
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default:
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break;
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}
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}
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if(uip_next_hdr != NULL && *uip_next_hdr == UIP_PROTO_ROUTING
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&& UIP_RH_BUF->routing_type == RPL_RH_TYPE_SRH) {
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/* Routing header found. The next hop should be already copied as the IPv6 destination
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* address, via rpl_process_srh_header. We turn this address into a link-local to enable
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* forwarding to next hop */
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uip_ipaddr_copy(ipaddr, &UIP_IP_BUF->destipaddr);
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uip_create_linklocal_prefix(ipaddr);
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uip_ext_len = last_uip_ext_len;
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return 1;
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}
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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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int
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rpl_process_srh_header(void)
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{
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uint8_t *uip_next_hdr;
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int last_uip_ext_len = uip_ext_len;
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uip_ext_len = 0;
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uip_next_hdr = &UIP_IP_BUF->proto;
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/* Look for routing header */
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while(uip_next_hdr != NULL && *uip_next_hdr != UIP_PROTO_ROUTING) {
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switch(*uip_next_hdr) {
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case UIP_PROTO_TCP:
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case UIP_PROTO_UDP:
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case UIP_PROTO_ICMP6:
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case UIP_PROTO_NONE:
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uip_next_hdr = NULL;
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break;
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case UIP_PROTO_HBHO:
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case UIP_PROTO_DESTO:
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case UIP_PROTO_FRAG:
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/* Move to next header */
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if(uip_next_hdr != &UIP_IP_BUF->proto) {
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uip_ext_len += (UIP_EXT_BUF->len << 3) + 8;
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}
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uip_next_hdr = &UIP_EXT_BUF->next;
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break;
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default:
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break;
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}
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}
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if(uip_next_hdr != NULL && *uip_next_hdr == UIP_PROTO_ROUTING
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&& UIP_RH_BUF->routing_type == RPL_RH_TYPE_SRH) {
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/* SRH found, now look for next hop */
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uint8_t cmpri, cmpre;
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uint8_t ext_len;
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uint8_t padding;
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uint8_t path_len;
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uint8_t segments_left;
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uip_ipaddr_t current_dest_addr;
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segments_left = UIP_RH_BUF->seg_left;
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ext_len = (UIP_RH_BUF->len * 8) + 8;
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cmpri = UIP_RPL_SRH_BUF->cmpr >> 4;
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cmpre = UIP_RPL_SRH_BUF->cmpr & 0x0f;
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padding = UIP_RPL_SRH_BUF->pad >> 4;
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path_len = ((ext_len - padding - RPL_RH_LEN - RPL_SRH_LEN - (16 - cmpre)) / (16 - cmpri)) + 1;
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(void)path_len;
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PRINTF("RPL: read SRH, path len %u, segments left %u, Cmpri %u, Cmpre %u, ext len %u (padding %u)\n",
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path_len, segments_left, cmpri, cmpre, ext_len, padding);
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if(segments_left == 0) {
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/* We are the final destination, do nothing */
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} else {
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uint8_t i = path_len - segments_left; /* The index of the next address to be visited */
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uint8_t *addr_ptr = ((uint8_t *)UIP_RH_BUF) + RPL_RH_LEN + RPL_SRH_LEN + (i * (16 - cmpri));
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uint8_t cmpr = segments_left == 1 ? cmpre : cmpri;
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/* As per RFC6554: swap the IPv6 destination address and address[i] */
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/* First, copy the current IPv6 destination address */
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uip_ipaddr_copy(¤t_dest_addr, &UIP_IP_BUF->destipaddr);
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/* Second, update the IPv6 destination address with addresses[i] */
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memcpy(((uint8_t *)&UIP_IP_BUF->destipaddr) + cmpr, addr_ptr, 16 - cmpr);
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/* Third, write current_dest_addr to addresses[i] */
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memcpy(addr_ptr, ((uint8_t *)¤t_dest_addr) + cmpr, 16 - cmpr);
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/* Update segments left field */
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UIP_RH_BUF->seg_left--;
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PRINTF("RPL: SRH next hop ");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("\n");
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}
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uip_ext_len = last_uip_ext_len;
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return 1;
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}
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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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static int
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count_matching_bytes(const void *p1, const void *p2, size_t n)
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{
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int i = 0;
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for(i = 0; i < n; i++) {
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if(((uint8_t *)p1)[i] != ((uint8_t *)p2)[i]) {
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return i;
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}
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}
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return n;
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}
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/*---------------------------------------------------------------------------*/
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static int
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insert_srh_header(void)
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{
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/* Implementation of RFC6554 */
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uint8_t temp_len;
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uint8_t path_len;
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uint8_t ext_len;
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uint8_t cmpri, cmpre; /* ComprI and ComprE fields of the RPL Source Routing Header */
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uint8_t *hop_ptr;
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uint8_t padding;
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rpl_ns_node_t *dest_node;
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rpl_ns_node_t *root_node;
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rpl_ns_node_t *node;
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rpl_dag_t *dag;
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uip_ipaddr_t node_addr;
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PRINTF("RPL: SRH creating source routing header with destination ");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF(" \n");
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/* Construct source route. We do not do this recursively to keep the runtime stack usage constant. */
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/* Get link of the destination and root */
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dag = rpl_get_dag(&UIP_IP_BUF->destipaddr);
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if(dag == NULL) {
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PRINTF("RPL: SRH DAG not found\n");
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return 0;
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}
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dest_node = rpl_ns_get_node(dag, &UIP_IP_BUF->destipaddr);
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if(dest_node == NULL) {
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/* The destination is not found, skip SRH insertion */
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return 1;
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}
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root_node = rpl_ns_get_node(dag, &dag->dag_id);
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if(root_node == NULL) {
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PRINTF("RPL: SRH root node not found\n");
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return 0;
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}
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if(!rpl_ns_is_node_reachable(dag, &UIP_IP_BUF->destipaddr)) {
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PRINTF("RPL: SRH no path found to destination\n");
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return 0;
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}
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/* Compute path length and compression factors (we use cmpri == cmpre) */
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path_len = 0;
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node = dest_node->parent;
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/* For simplicity, we use cmpri = cmpre */
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cmpri = 15;
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cmpre = 15;
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while(node != NULL && node != root_node) {
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rpl_ns_get_node_global_addr(&node_addr, node);
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/* How many bytes in common between all nodes in the path? */
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cmpri = MIN(cmpri, count_matching_bytes(&node_addr, &UIP_IP_BUF->destipaddr, 16));
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cmpre = cmpri;
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PRINTF("RPL: SRH Hop ");
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PRINT6ADDR(&node_addr);
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PRINTF("\n");
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node = node->parent;
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path_len++;
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}
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if(((DEBUG) & DEBUG_PRINT) && node != NULL) {
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rpl_ns_get_node_global_addr(&node_addr, node);
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PRINTF("RPL: SRH Next Hop ");
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PRINT6ADDR(&node_addr);
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PRINTF("\n");
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}
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/* Extension header length: fixed headers + (n-1) * (16-ComprI) + (16-ComprE)*/
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ext_len = RPL_RH_LEN + RPL_SRH_LEN
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+ (path_len - 1) * (16 - cmpre)
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+ (16 - cmpri);
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padding = ext_len % 8 == 0 ? 0 : (8 - (ext_len % 8));
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ext_len += padding;
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PRINTF("RPL: SRH Path len: %u, ComprI %u, ComprE %u, ext len %u (padding %u)\n",
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path_len, cmpri, cmpre, ext_len, padding);
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/* Check if there is enough space to store the extension header */
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if(uip_len + ext_len > UIP_BUFSIZE) {
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PRINTF("RPL: Packet too long: impossible to add source routing header (%u bytes)\n", ext_len);
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return 1;
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}
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/* Move existing ext headers and payload uip_ext_len further */
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memmove(uip_buf + uip_l2_l3_hdr_len + ext_len,
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uip_buf + uip_l2_l3_hdr_len, uip_len - UIP_IPH_LEN);
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memset(uip_buf + uip_l2_l3_hdr_len, 0, ext_len);
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/* Insert source routing header */
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UIP_RH_BUF->next = UIP_IP_BUF->proto;
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UIP_IP_BUF->proto = UIP_PROTO_ROUTING;
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/* Initialize IPv6 Routing Header */
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UIP_RH_BUF->len = (ext_len - 8) / 8;
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UIP_RH_BUF->routing_type = RPL_RH_TYPE_SRH;
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UIP_RH_BUF->seg_left = path_len;
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/* Initialize RPL Source Routing Header */
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UIP_RPL_SRH_BUF->cmpr = (cmpri << 4) + cmpre;
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UIP_RPL_SRH_BUF->pad = padding << 4;
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/* Initialize addresses field (the actual source route).
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* From last to first. */
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node = dest_node;
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hop_ptr = ((uint8_t *)UIP_RH_BUF) + ext_len - padding; /* Pointer where to write the next hop compressed address */
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while(node != NULL && node->parent != root_node) {
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rpl_ns_get_node_global_addr(&node_addr, node);
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|
hop_ptr -= (16 - cmpri);
|
|
memcpy(hop_ptr, ((uint8_t*)&node_addr) + cmpri, 16 - cmpri);
|
|
|
|
node = node->parent;
|
|
}
|
|
|
|
/* The next hop (i.e. node whose parent is the root) is placed as the current IPv6 destination */
|
|
rpl_ns_get_node_global_addr(&node_addr, node);
|
|
uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &node_addr);
|
|
|
|
/* In-place update of IPv6 length field */
|
|
temp_len = UIP_IP_BUF->len[1];
|
|
UIP_IP_BUF->len[1] += ext_len;
|
|
if(UIP_IP_BUF->len[1] < temp_len) {
|
|
UIP_IP_BUF->len[0]++;
|
|
}
|
|
|
|
uip_ext_len += ext_len;
|
|
uip_len += ext_len;
|
|
|
|
return 1;
|
|
}
|
|
#else /* RPL_WITH_NON_STORING */
|
|
int insert_srh_header(void);
|
|
#endif /* RPL_WITH_NON_STORING */
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
update_hbh_header(void)
|
|
{
|
|
rpl_instance_t *instance;
|
|
int uip_ext_opt_offset;
|
|
int last_uip_ext_len;
|
|
rpl_parent_t *parent;
|
|
|
|
last_uip_ext_len = uip_ext_len;
|
|
uip_ext_len = 0;
|
|
uip_ext_opt_offset = 2;
|
|
|
|
PRINTF("RPL: Verifying the presence of the RPL header option\n");
|
|
|
|
switch(UIP_IP_BUF->proto) {
|
|
case UIP_PROTO_HBHO:
|
|
if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
|
|
PRINTF("RPL: Hop-by-hop extension header has wrong size\n");
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 1;
|
|
}
|
|
if(UIP_EXT_HDR_OPT_RPL_BUF->opt_type != UIP_EXT_HDR_OPT_RPL) {
|
|
PRINTF("RPL: Non RPL Hop-by-hop option support not implemented\n");
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 1;
|
|
}
|
|
if(UIP_EXT_HDR_OPT_RPL_BUF->opt_len != RPL_HDR_OPT_LEN) {
|
|
PRINTF("RPL: RPL Hop-by-hop option has wrong length\n");
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 1;
|
|
}
|
|
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
|
|
if(instance == NULL || !instance->used || !instance->current_dag->joined) {
|
|
PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect instance\n");
|
|
return 1;
|
|
}
|
|
break;
|
|
default:
|
|
PRINTF("RPL: No hop-by-hop option found\n");
|
|
return 1;
|
|
}
|
|
|
|
switch(UIP_EXT_HDR_OPT_BUF->type) {
|
|
case UIP_EXT_HDR_OPT_RPL:
|
|
PRINTF("RPL: Updating RPL option\n");
|
|
UIP_EXT_HDR_OPT_RPL_BUF->senderrank = UIP_HTONS(instance->current_dag->rank);
|
|
|
|
if(RPL_IS_STORING(instance)) { /* In non-storing mode, downwards traffic does not have the HBH option */
|
|
/* Check the direction of the down flag, as per Section 11.2.2.3,
|
|
which states that if a packet is going down it should in
|
|
general not go back up again. If this happens, a
|
|
RPL_HDR_OPT_FWD_ERR should be flagged. */
|
|
if((UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_DOWN)) {
|
|
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
|
|
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_FWD_ERR;
|
|
PRINTF("RPL forwarding error\n");
|
|
/* We should send back the packet to the originating parent,
|
|
but it is not feasible yet, so we send a No-Path DAO instead */
|
|
PRINTF("RPL generate No-Path DAO\n");
|
|
parent = rpl_get_parent((uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_SENDER));
|
|
if(parent != NULL) {
|
|
dao_output_target(parent, &UIP_IP_BUF->destipaddr, RPL_ZERO_LIFETIME);
|
|
}
|
|
/* Drop packet */
|
|
return 0;
|
|
}
|
|
} else {
|
|
/* Set the down extension flag correctly as described in Section
|
|
11.2 of RFC6550. If the packet progresses along a DAO route,
|
|
the down flag should be set. */
|
|
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
|
|
/* No route was found, so this packet will go towards the RPL
|
|
root. If so, we should not set the down flag. */
|
|
UIP_EXT_HDR_OPT_RPL_BUF->flags &= ~RPL_HDR_OPT_DOWN;
|
|
PRINTF("RPL option going up\n");
|
|
} else {
|
|
/* A DAO route was found so we set the down flag. */
|
|
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_DOWN;
|
|
PRINTF("RPL option going down\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 1;
|
|
default:
|
|
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 1;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
insert_hbh_header(void)
|
|
{
|
|
int uip_ext_opt_offset;
|
|
int last_uip_ext_len;
|
|
uint8_t temp_len;
|
|
|
|
last_uip_ext_len = uip_ext_len;
|
|
uip_ext_len = 0;
|
|
uip_ext_opt_offset = 2;
|
|
|
|
/* Insert hop-by-hop header */
|
|
PRINTF("RPL: Creating hop-by-hop option\n");
|
|
if(uip_len + RPL_HOP_BY_HOP_LEN > UIP_BUFSIZE) {
|
|
PRINTF("RPL: Packet too long: impossible to add hop-by-hop option\n");
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 0;
|
|
}
|
|
|
|
/* Move existing ext headers and payload UIP_EXT_BUF further */
|
|
memmove(UIP_HBHO_NEXT_BUF, UIP_EXT_BUF, uip_len - UIP_IPH_LEN);
|
|
memset(UIP_HBHO_BUF, 0, RPL_HOP_BY_HOP_LEN);
|
|
|
|
/* Update IP and HBH protocol and fields */
|
|
UIP_HBHO_BUF->next = UIP_IP_BUF->proto;
|
|
UIP_IP_BUF->proto = UIP_PROTO_HBHO;
|
|
|
|
/* Initialize HBH option */
|
|
UIP_HBHO_BUF->len = (RPL_HOP_BY_HOP_LEN - 8) / 8;
|
|
UIP_EXT_HDR_OPT_RPL_BUF->opt_type = UIP_EXT_HDR_OPT_RPL;
|
|
UIP_EXT_HDR_OPT_RPL_BUF->opt_len = RPL_HDR_OPT_LEN;
|
|
UIP_EXT_HDR_OPT_RPL_BUF->flags = 0;
|
|
UIP_EXT_HDR_OPT_RPL_BUF->instance = 0;
|
|
UIP_EXT_HDR_OPT_RPL_BUF->senderrank = 0;
|
|
uip_len += RPL_HOP_BY_HOP_LEN;
|
|
temp_len = UIP_IP_BUF->len[1];
|
|
UIP_IP_BUF->len[1] += UIP_HBHO_BUF->len + 8;
|
|
if(UIP_IP_BUF->len[1] < temp_len) {
|
|
UIP_IP_BUF->len[0]++;
|
|
}
|
|
|
|
uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN;
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
rpl_finalize_header(uip_ipaddr_t *addr)
|
|
{
|
|
rpl_parent_t *parent;
|
|
int uip_ext_opt_offset;
|
|
int last_uip_ext_len;
|
|
|
|
last_uip_ext_len = uip_ext_len;
|
|
uip_ext_len = 0;
|
|
uip_ext_opt_offset = 2;
|
|
|
|
if(UIP_IP_BUF->proto == UIP_PROTO_HBHO) {
|
|
if(UIP_HBHO_BUF->len != RPL_HOP_BY_HOP_LEN - 8) {
|
|
PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
|
|
uip_ext_len = last_uip_ext_len;
|
|
return 1;
|
|
}
|
|
|
|
if(UIP_EXT_HDR_OPT_BUF->type == UIP_EXT_HDR_OPT_RPL) {
|
|
if(UIP_EXT_HDR_OPT_RPL_BUF->senderrank == 0) {
|
|
PRINTF("RPL: Updating RPL option\n");
|
|
if(default_instance == NULL || !default_instance->used || !default_instance->current_dag->joined) {
|
|
PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect default instance\n");
|
|
return 0;
|
|
}
|
|
parent = rpl_find_parent(default_instance->current_dag, addr);
|
|
if(parent == NULL || parent != parent->dag->preferred_parent) {
|
|
UIP_EXT_HDR_OPT_RPL_BUF->flags = RPL_HDR_OPT_DOWN;
|
|
}
|
|
UIP_EXT_HDR_OPT_RPL_BUF->instance = default_instance->instance_id;
|
|
UIP_EXT_HDR_OPT_RPL_BUF->senderrank = UIP_HTONS(default_instance->current_dag->rank);
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rpl_remove_header(void)
|
|
{
|
|
uint8_t temp_len;
|
|
uint8_t rpl_ext_hdr_len;
|
|
uint8_t *uip_next_hdr;
|
|
|
|
uip_ext_len = 0;
|
|
uip_next_hdr = &UIP_IP_BUF->proto;
|
|
|
|
PRINTF("RPL: Verifying the presence of RPL extension headers\n");
|
|
|
|
/* Look for hop-by-hop and routing headers */
|
|
while(uip_next_hdr != NULL) {
|
|
switch(*uip_next_hdr) {
|
|
case UIP_PROTO_TCP:
|
|
case UIP_PROTO_UDP:
|
|
case UIP_PROTO_ICMP6:
|
|
case UIP_PROTO_NONE:
|
|
return;
|
|
case UIP_PROTO_HBHO:
|
|
case UIP_PROTO_ROUTING:
|
|
/* Remove hop-by-hop and routing headers */
|
|
*uip_next_hdr = UIP_EXT_BUF->next;
|
|
rpl_ext_hdr_len = (UIP_EXT_BUF->len * 8) + 8;
|
|
temp_len = UIP_IP_BUF->len[1];
|
|
uip_len -= rpl_ext_hdr_len;
|
|
UIP_IP_BUF->len[1] -= rpl_ext_hdr_len;
|
|
if(UIP_IP_BUF->len[1] > temp_len) {
|
|
UIP_IP_BUF->len[0]--;
|
|
}
|
|
PRINTF("RPL: Removing RPL extension header (type %u, len %u)\n", *uip_next_hdr, rpl_ext_hdr_len);
|
|
memmove(UIP_EXT_BUF, ((uint8_t *)UIP_EXT_BUF) + rpl_ext_hdr_len, uip_len - UIP_IPH_LEN);
|
|
break;
|
|
default:
|
|
/* Move to next header */
|
|
if(uip_next_hdr != &UIP_IP_BUF->proto) {
|
|
uip_ext_len += (UIP_EXT_BUF->len << 3) + 8;
|
|
}
|
|
uip_next_hdr = &UIP_EXT_BUF->next;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rpl_insert_header(void)
|
|
{
|
|
if(default_instance == NULL) {
|
|
return;
|
|
}
|
|
|
|
if(RPL_IS_STORING(default_instance)) {
|
|
if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) {
|
|
insert_hbh_header();
|
|
}
|
|
}
|
|
|
|
if(RPL_IS_NON_STORING(default_instance)) {
|
|
if(default_instance->current_dag != NULL) {
|
|
if(default_instance->current_dag->rank == ROOT_RANK(default_instance)) {
|
|
insert_srh_header();
|
|
} else {
|
|
insert_hbh_header();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
rpl_update_header(void)
|
|
{
|
|
if(default_instance == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
if(default_instance->current_dag != NULL) {
|
|
if(default_instance->current_dag->rank == ROOT_RANK(default_instance)) {
|
|
/* At the root, remove headers if any, and insert SRH or HBH
|
|
* (SRH is inserted only if the destination is in the DODAG) */
|
|
rpl_remove_header();
|
|
if(RPL_IS_NON_STORING(default_instance)) {
|
|
return insert_srh_header();
|
|
} else {
|
|
return insert_hbh_header();
|
|
}
|
|
} else {
|
|
return update_hbh_header();
|
|
}
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/** @}*/
|