rpl-ext-header.c

/**
 * \addtogroup uip6
 * @{
 */
/*
 * Copyright (c) 2009, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file is part of the Contiki operating system.
 */
/**
 * \file
 *         Management of extension headers for ContikiRPL.
 *
 * \author Vincent Brillault <vincent.brillault@imag.fr>,
 *         Joakim Eriksson <joakime@sics.se>,
 *         Niclas Finne <nfi@sics.se>,
 *         Nicolas Tsiftes <nvt@sics.se>.
 */

//#include "net/uip.h"
//#include "net/tcpip.h"
//#include "net/uip-ds6.h"
#include "rpl-private.h"

#define DEBUG DEBUG_NONE
//#include "net/uip-debug.h"

#include <limits.h>
#include <string.h>

/*---------------------------------------------------------------------------*/
/*
#define UIP_IP_BUF                ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_EXT_BUF               ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#define UIP_HBHO_BUF              ((struct uip_hbho_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#define UIP_HBHO_NEXT_BUF         ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len + RPL_HOP_BY_HOP_LEN])
#define UIP_EXT_HDR_OPT_BUF       ((struct uip_ext_hdr_opt *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
#define UIP_EXT_HDR_OPT_PADN_BUF  ((struct uip_ext_hdr_opt_padn *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
#define UIP_EXT_HDR_OPT_RPL_BUF   ((struct uip_ext_hdr_opt_rpl *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
*/
/*---------------------------------------------------------------------------*/
int
rpl_verify_header(int uip_ext_opt_offset)
{
  /* rpl_instance_t *instance; */
  /* int down; */
  /* uint8_t sender_closer; */

  /* if(UIP_EXT_HDR_OPT_RPL_BUF->opt_len != RPL_HDR_OPT_LEN) { */
  /*   PRINTF("RPL: Bad header option! (wrong length)\n"); */
  /*   return 1; */
  /* } */

  /* if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_FWD_ERR) { */
  /*   PRINTF("RPL: Forward error!\n"); */
  /*   /\* We should try to repair it, not implemented for the moment *\/ */
  /*   return 2; */
  /* } */

  /* instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance); */
  /* if(instance == NULL) { */
  /*   PRINTF("RPL: Unknown instance: %u\n", */
  /*          UIP_EXT_HDR_OPT_RPL_BUF->instance); */
  /*   return 1; */
  /* } */

  /* if(!instance->current_dag->joined) { */
  /*   PRINTF("RPL: No DAG in the instance\n"); */
  /*   return 1; */
  /* } */

  /* down = 0; */
  /* if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_DOWN) { */
  /*   down = 1; */
  /* } */

  /* sender_closer = UIP_EXT_HDR_OPT_RPL_BUF->senderrank < instance->current_dag->rank; */

  /* PRINTF("RPL: Packet going %s, sender closer %d (%d < %d)\n", down == 1 ? "down" : "up", */
  /* 	 sender_closer, */
  /* 	 UIP_EXT_HDR_OPT_RPL_BUF->senderrank, */
  /* 	 instance->current_dag->rank */
  /* 	 ); */

  /* if((down && !sender_closer) || (!down && sender_closer)) { */
  /*   PRINTF("RPL: Loop detected - senderrank: %d my-rank: %d sender_closer: %d\n", */
  /* 	   UIP_EXT_HDR_OPT_RPL_BUF->senderrank, instance->current_dag->rank, */
  /* 	   sender_closer); */
  /*   if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_RANK_ERR) { */
  /*     PRINTF("RPL: Rank error signalled in RPL option!\n"); */
  /*     /\* We should try to repair it, not implemented for the moment *\/ */
  /*     return 3; */
  /*   } */
  /*   PRINTF("RPL: Single error tolerated\n"); */
  /*   UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_RANK_ERR; */
  /*   return 0; */
  /* } */

  /* PRINTF("RPL: Rank OK\n"); */

  return 0;
}
/*---------------------------------------------------------------------------*/
static void
set_rpl_opt(unsigned uip_ext_opt_offset)
{
  uint8_t temp_len;

  /* memmove(UIP_HBHO_NEXT_BUF, UIP_EXT_BUF, uip_len - UIP_IPH_LEN); */
  /* memset(UIP_HBHO_BUF, 0, RPL_HOP_BY_HOP_LEN); */
  /* UIP_HBHO_BUF->next = UIP_IP_BUF->proto; */
  /* UIP_IP_BUF->proto = UIP_PROTO_HBHO; */
  /* UIP_HBHO_BUF->len = RPL_HOP_BY_HOP_LEN - 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]++; */
  /* } */
}
/*---------------------------------------------------------------------------*/
void
rpl_update_header_empty(void)
{
  /* rpl_instance_t *instance; */
  /* 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; */

  /* 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: Non RPL Hop-by-hop options support not implemented\n"); */
  /*     uip_ext_len = last_uip_ext_len; */
  /*     return; */
  /*   } */
  /*   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; */
  /*   } */
  /*   break; */
  /* default: */
  /*   PRINTF("RPL: No hop-by-hop option found, creating it\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; */
  /*   } */
  /*   set_rpl_opt(uip_ext_opt_offset); */
  /*   uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN; */
  /*   return; */
  /* } */

  /* 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 = instance->current_dag->rank; */


  /*   /\* 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; */
  /*   } else { */
  /*     /\* A DAO route was found so we set the down flag. *\/ */
  /*     UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_DOWN; */
  /*   } */

  /*   uip_ext_len = last_uip_ext_len; */
  /*   return; */
  /* default: */
  /*   PRINTF("RPL: Multi Hop-by-hop options not implemented\n"); */
  /*   uip_ext_len = last_uip_ext_len; */
  /*   return; */
  /* } */
}
/*---------------------------------------------------------------------------*/
int
rpl_update_header_final(struct in6_addr *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 0; */
  /*   } */

  /*   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 1; */
  /*       } */
  /*       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 = default_instance->current_dag->rank; */
  /*       uip_ext_len = last_uip_ext_len; */
  /*     } */
  /*   } */
  /* } */
  return 0;
}
/*---------------------------------------------------------------------------*/
void
rpl_remove_header(void)
{
  /* int last_uip_ext_len; */
  /* uint8_t temp_len; */

  /* last_uip_ext_len = uip_ext_len; */
  /* uip_ext_len = 0; */

  /* PRINTF("RPL: Verifying the presence of the RPL header option\n"); */
  /* switch(UIP_IP_BUF->proto){ */
  /* case UIP_PROTO_HBHO: */
  /*   PRINTF("RPL: Removing the RPL header option\n"); */
  /*   UIP_IP_BUF->proto = UIP_HBHO_BUF->next; */
  /*   temp_len = UIP_IP_BUF->len[1]; */
  /*   uip_len -= UIP_HBHO_BUF->len + 8; */
  /*   UIP_IP_BUF->len[1] -= UIP_HBHO_BUF->len + 8; */
  /*   if(UIP_IP_BUF->len[1] > temp_len) { */
  /*     UIP_IP_BUF->len[0]--; */
  /*   } */
  /*   memmove(UIP_EXT_BUF, UIP_HBHO_NEXT_BUF, uip_len - UIP_IPH_LEN); */
  /*   break; */
  /* default: */
  /*   PRINTF("RPL: No hop-by-hop Option found\n"); */
  /* } */
}
/*---------------------------------------------------------------------------*/
uint8_t
rpl_invert_header(void)
{
  /* uint8_t uip_ext_opt_offset; */
  /* uint8_t last_uip_ext_len; */

  /* 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: */
  /*   break; */
  /* default: */
  /*   PRINTF("RPL: No hop-by-hop Option found\n"); */
  /*   uip_ext_len = last_uip_ext_len; */
  /*   return 0; */
  /* } */

  /* switch (UIP_EXT_HDR_OPT_BUF->type) { */
  /* case UIP_EXT_HDR_OPT_RPL: */
  /*   PRINTF("RPL: Updating RPL option (switching direction)\n"); */
  /*   UIP_EXT_HDR_OPT_RPL_BUF->flags &= RPL_HDR_OPT_DOWN; */
  /*   UIP_EXT_HDR_OPT_RPL_BUF->flags ^= RPL_HDR_OPT_DOWN; */
  /*   UIP_EXT_HDR_OPT_RPL_BUF->senderrank = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance)->current_dag->rank; */
  /*   uip_ext_len = last_uip_ext_len; */
  /*   return RPL_HOP_BY_HOP_LEN; */
  /* default: */
  /*   PRINTF("RPL: Multi Hop-by-hop options not implemented\n"); */
  /*   uip_ext_len = last_uip_ext_len; */
  /*   return 0; */
  /* } */
  return 0;
}
/*---------------------------------------------------------------------------*/