added experimental support for disseminating autoconf prefix via DIO suboption
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joxe
parent
8e619e991d
commit
34b8313fb6
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@ -32,7 +32,7 @@
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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: rpl-dag.c,v 1.7 2010/05/24 16:38:56 nvt-se Exp $
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* $Id: rpl-dag.c,v 1.8 2010/05/25 19:19:43 joxe Exp $
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*/
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/**
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* \file
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@ -44,6 +44,7 @@
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#include "net/rpl/rpl.h"
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#include "net/uip.h"
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#include "net/uip-nd6.h"
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#include "net/rime/ctimer.h"
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#include "lib/list.h"
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#include "lib/memb.h"
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@ -162,6 +163,22 @@ rpl_set_root(uip_ipaddr_t *dag_id)
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}
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/************************************************************************/
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int
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rpl_set_prefix(rpl_dag_t *dag, uip_ipaddr_t *prefix, int len) {
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if(len <= 128) {
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memset(&dag->destination_prefix.prefix, 0, 16);
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memcpy(&dag->destination_prefix.prefix, prefix, (len + 7)/ 8);
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dag->destination_prefix.length = len;
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/* Note: this is an experiment to see if RPL can be used for
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prefix-assignment for RPL nodes - this flag is originally
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intended for Router Advertisements */
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dag->destination_prefix.preference = UIP_ND6_RA_FLAG_AUTONOMOUS;
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PRINTF("RPL: Prefix set - will announce this in DIOs\n");
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return 0;
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}
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return -1;
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}
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/************************************************************************/
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int
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rpl_set_default_route(rpl_dag_t *dag, uip_ipaddr_t *from)
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{
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if(dag->def_route != NULL) {
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@ -423,6 +440,10 @@ join_dag(uip_ipaddr_t *from, rpl_dio_t *dio)
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memcpy(&dag->dag_id, &dio->dag_id, sizeof(dio->dag_id));
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/* copy prefix information into the dag */
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memcpy(&dag->destination_prefix, &dio->destination_prefix,
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sizeof(rpl_prefix_t));
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rpl_join_dag(dag);
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PRINTF("RPL: Joined DAG with instance ID %u, rank %hu, DAG ID ",
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@ -33,7 +33,7 @@
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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: rpl-icmp6.c,v 1.9 2010/05/24 16:38:56 nvt-se Exp $
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* $Id: rpl-icmp6.c,v 1.10 2010/05/25 19:19:43 joxe Exp $
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*/
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/**
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* \file
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@ -164,7 +164,6 @@ dio_input(void)
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uint8_t subopt_type;
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int i;
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int len;
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rpl_prefix_t prefix;
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uip_ipaddr_t from;
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uip_ds6_nbr_t *nbr;
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@ -237,7 +236,37 @@ dio_input(void)
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PRINTF("RPL: Invalid destination prefix option, len = %d\n", len);
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return;
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}
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prefix.preference = (buffer[3] >> 3) & 0x3;
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/* prebference is both preference and flags for now */
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dio.destination_prefix.preference = buffer[i + 3];
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dio.destination_prefix.lifetime = get32(buffer, i + 4);
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dio.destination_prefix.length = buffer[i + 8];
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if(((dio.destination_prefix.length + 7)/ 8) + 9 <= len &&
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dio.destination_prefix.length <= 128) {
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PRINTF("RPL: Copying destination prefix\n");
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memcpy(&dio.destination_prefix.prefix, &buffer[i + 9],
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(dio.destination_prefix.length + 7) / 8);
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/* NOTE: This is a test for adding autoconf prefix in RPL via */
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/* a destination prefix - this use one reserved flag bit */
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/* This should not be made until RPL decides to join the DAG */
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/* And not if there already is a global address configured for */
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/* the specific DAG */
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if((dio.destination_prefix.preference & UIP_ND6_RA_FLAG_AUTONOMOUS)) {
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uip_ipaddr_t ipaddr;
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memcpy(&ipaddr, &dio.destination_prefix.prefix,
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(dio.destination_prefix.length + 7) / 8);
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uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr);
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if(uip_ds6_addr_lookup(&ipaddr) == NULL) {
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PRINTF("RPL: adding global IP address ");
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PRINT6ADDR(&ipaddr);
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PRINTF("\n");
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uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
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}
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}
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} else {
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PRINTF("RPL: Invalid destination prefix option, len = %d\n", len);
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}
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break;
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case RPL_DIO_SUBOPT_DAG_CONF:
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dio.dag_intdoubl = buffer[i + 3];
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@ -309,6 +338,26 @@ dio_output(rpl_dag_t *dag, uip_ipaddr_t *uc_addr)
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buffer[pos++] = dag->max_rankinc;
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buffer[pos++] = dag->min_hoprankinc;
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/* if prefix length > 0 then we have a prefix to send! */
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if(dag->destination_prefix.length > 0) {
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buffer[pos++] = RPL_DIO_SUBOPT_DEST_PREFIX;
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buffer[pos++] = 0;
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buffer[pos++] = (dag->destination_prefix.length + 7)/ 8 + 9;
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buffer[pos++] = dag->destination_prefix.preference;
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set32(buffer, pos, dag->destination_prefix.lifetime);
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pos += 4;
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buffer[pos++] = dag->destination_prefix.length;
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memcpy(&buffer[pos], &(dag->destination_prefix.prefix),
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(dag->destination_prefix.length + 7)/ 8);
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pos += (dag->destination_prefix.length + 7)/ 8;
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PRINTF("RPL: Sending prefix info in DIO ");
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PRINT6ADDR(&dag->destination_prefix.prefix);
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PRINTF("\n");
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} else {
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PRINTF("RPL: No prefix to announce. len:%d\n",
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dag->destination_prefix.length);
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}
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/* buffer[len++] = RPL_DIO_SUBOPT_PAD1; */
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/* Unicast requests get unicast replies! */
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@ -30,7 +30,7 @@
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*
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* Author: Joakim Eriksson, Nicolas Tsiftes
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*
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* $Id: rpl.h,v 1.2 2010/04/30 15:03:55 nvt-se Exp $
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* $Id: rpl.h,v 1.3 2010/05/25 19:19:43 joxe Exp $
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*/
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#ifndef RPL_H
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@ -146,6 +146,16 @@ struct rpl_of {
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typedef struct rpl_of rpl_of_t;
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/* RPL DIO prefix suboption */
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struct rpl_prefix {
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uip_ipaddr_t prefix;
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uint32_t lifetime;
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uint8_t length;
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uint8_t preference;
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};
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typedef struct rpl_prefix rpl_prefix_t;
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/* Logical representation of a DAG Information Object (DIO.) */
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struct rpl_dio {
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uip_ipaddr_t dag_id;
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@ -163,19 +173,11 @@ struct rpl_dio {
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uint8_t dag_redund;
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uint8_t dag_max_rankinc;
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uint8_t dag_min_hoprankinc;
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rpl_prefix_t destination_prefix;
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};
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typedef struct rpl_dio rpl_dio_t;
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struct rpl_prefix {
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uip_ipaddr_t prefix;
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uint32_t lifetime;
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uint8_t length;
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uint8_t preference;
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};
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typedef struct rpl_prefix rpl_prefix_t;
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/* Directed Acyclic Graph */
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struct rpl_dag {
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/* DAG configuration */
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@ -213,6 +215,7 @@ struct rpl_dag {
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rpl_neighbor_t *best_parent;
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void *neighbor_list;
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list_t neighbors;
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rpl_prefix_t destination_prefix;
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};
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typedef struct rpl_dag rpl_dag_t;
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@ -236,6 +239,7 @@ void uip_rpl_input(void);
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/* RPL logic functions. */
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int rpl_set_root(uip_ipaddr_t *);
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int rpl_set_prefix(rpl_dag_t *dag, uip_ipaddr_t *prefix, int len);
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int rpl_repair_dag(rpl_dag_t *dag);
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int rpl_set_default_route(rpl_dag_t *dag, uip_ipaddr_t *from);
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void rpl_process_dio(uip_ipaddr_t *, rpl_dio_t *);
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