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changed DAOs to be formatted according to the rpl-08 specification
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joxe
parent
f52e97111f
commit
ba2bf31c20
@ -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 1.14 2010/06/02 11:59:51 joxe Exp $
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* $Id: rpl-icmp6.c,v 1.15 2010/06/03 14:49:15 joxe Exp $
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*/
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/**
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* \file
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@ -408,13 +408,20 @@ dao_input(void)
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uint16_t sequence;
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uint8_t instance_id;
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uint32_t lifetime;
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uint8_t rank;
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uint8_t prefixlen;
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uint32_t route_tag;
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uint8_t flags;
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uint8_t subopt_type;
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uip_ipaddr_t prefix;
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uip_ds6_route_t *rep;
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rpl_parent_t *n;
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uint8_t buffer_length;
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int pos;
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int len;
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int i;
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lifetime = 0;
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prefixlen = 0;
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/* Destination Advertisement Object */
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PRINTF("RPL: Received a DAO from ");
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@ -422,45 +429,61 @@ dao_input(void)
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PRINTF("\n");
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buffer = UIP_ICMP_PAYLOAD;
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buffer_length = uip_len - uip_l2_l3_icmp_hdr_len;
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pos = 0;
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sequence = (buffer[pos] << 8) | buffer[pos + 1];
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pos += 2;
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rank = (buffer[pos] << 8) | buffer[pos + 1];
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pos += 2;
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/* pos = 4 */
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instance_id = buffer[pos++];
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route_tag = buffer[pos++];
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prefixlen = buffer[pos++];
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/* ignore RRCount for now: rrcount = buffer[pos++]; */
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flags = buffer[pos++];
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/* reserved */
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pos++;
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/* pos = 8 */
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lifetime = get32(buffer, pos);
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pos += 4;
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sequence = buffer[pos++];
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/* is the DAGID present ? */
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if(flags & RPL_DAO_D_FLAG) {
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/* currently the DAG ID is ignored since we only use global
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RPL Instance IDs... */
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pos += 16;
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}
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/* handle the target option */
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dag = rpl_get_dag(instance_id);
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if(dag == NULL) {
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PRINTF("RPL: Ignoring a DAO for a different DAG instance (%u)\n",
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instance_id);
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instance_id);
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return;
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}
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if(rank < dag->rank) {
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PRINTF("RPL: Incoming DAO rank is %u, my rank is %u\n",
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(unsigned)rank, (unsigned)dag->rank);
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return;
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/* Check if there are any DIO suboptions. */
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i = pos;
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for(; i < buffer_length; i += len) {
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subopt_type = buffer[i];
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if(subopt_type == RPL_DIO_SUBOPT_PAD1) {
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len = 1;
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} else {
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/* Suboption with a two-byte header + payload */
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len = 2 + buffer[i + 1];
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}
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switch(subopt_type) {
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case RPL_DIO_SUBOPT_TARGET:
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prefixlen = buffer[i + 3];
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memset(&prefix, 0, sizeof(prefix));
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memcpy(&prefix, buffer + i + 4, prefixlen / CHAR_BIT);
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break;
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case RPL_DIO_SUBOPT_TRANSIT:
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/* path sequence and control ignored */
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lifetime = get32(buffer, i + 4);
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/* parent address also ignored */
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break;
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}
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}
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memset(&prefix, 0, sizeof(prefix));
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memcpy(&prefix, buffer + pos, prefixlen / CHAR_BIT);
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PRINTF("RPL: DAO rank: %u, lifetime: %lu, prefix length: %u",
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(unsigned)rank, (unsigned long)lifetime, (unsigned)prefixlen);
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PRINTF("RPL: DAO lifetime: %lu, prefix length: %u",
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(unsigned long)lifetime, (unsigned)prefixlen);
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PRINTF("\n");
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if(lifetime == ZERO_LIFETIME) {
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/* No-DAO received; invoke the route purging routine. */
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rep = uip_ds6_route_lookup(&prefix);
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@ -491,8 +514,7 @@ dao_input(void)
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PRINTF("RPL: Forwarding DAO to parent ");
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PRINT6ADDR(&n->addr);
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PRINTF("\n");
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uip_icmp6_send(&n->addr, ICMP6_RPL, RPL_CODE_DAO,
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14 + (prefixlen / CHAR_BIT));
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uip_icmp6_send(&n->addr, ICMP6_RPL, RPL_CODE_DAO, buffer_length);
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}
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}
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}
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@ -509,11 +531,15 @@ dao_output(rpl_parent_t *n, uint32_t lifetime)
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int pos;
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/* Destination Advertisement Object */
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if(get_global_addr(&prefix) == 0) {
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PRINTF("RPL: No global address set for this node - suppressing DAO\n");
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return;
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}
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if(n == NULL) {
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dag = rpl_get_dag(RPL_ANY_INSTANCE);
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if(dag == NULL) {
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PRINTF("RPL: Did not join a DAG before receiving DAO\n");
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PRINTF("RPL: Did not join a DAG before sending DAO\n");
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return;
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}
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} else {
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@ -524,35 +550,29 @@ dao_output(rpl_parent_t *n, uint32_t lifetime)
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++sequence;
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pos = 0;
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buffer[pos++] = sequence >> 8;
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buffer[pos++] = dag->instance_id;
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buffer[pos++] = 0; /* no ack request, no DODAGID */
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buffer[pos++] = 0; /* reserved */
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buffer[pos++] = sequence & 0xff;
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buffer[pos++] = dag->rank >> 8;
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buffer[pos++] = dag->rank & 0xff;
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/* pos = 4 */
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buffer[pos++] = dag->instance_id;
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/* Route tag. Unspecified in draft-ietf-roll-rpl-06. */
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buffer[pos++] = 0;
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/* create target subopt */
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prefixlen = sizeof(prefix) * CHAR_BIT;
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buffer[pos++] = RPL_DIO_SUBOPT_TARGET;
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buffer[pos++] = 2 + ((prefixlen + 7) / CHAR_BIT);
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buffer[pos++] = 0; /* reserved */
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buffer[pos++] = prefixlen;
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/* Reverse route count. Not used because reverse routing is unscalable
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beyond a few hops. */
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buffer[pos++] = 0;
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/* pos = 8 */
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/* DAO Lifetime. */
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memcpy(buffer + pos, &prefix, (prefixlen + 7) / CHAR_BIT);
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pos += ((prefixlen + 7) / CHAR_BIT);
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/* create a transit information subopt */
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buffer[pos++] = RPL_DIO_SUBOPT_TRANSIT;
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buffer[pos++] = 6;
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buffer[pos++] = 0; /* path seq - ignored */
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buffer[pos++] = 0; /* path control - ignored */
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set32(buffer, pos, lifetime);
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pos += 4;
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/* pos = 12 or 14 */
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if(get_global_addr(&prefix) == 0) {
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PRINTF("RPL: No global address set for this node - suppressing DAO\n");
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return;
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}
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memcpy(buffer + pos, &prefix, prefixlen / CHAR_BIT);
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pos += (prefixlen / CHAR_BIT);
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if(n == NULL) {
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uip_create_linklocal_allnodes_mcast(&addr);
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} else {
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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 1.10 2010/06/02 16:55:00 joxe Exp $
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* $Id: rpl.h,v 1.11 2010/06/03 14:49:16 joxe Exp $
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*/
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#ifndef RPL_H
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@ -71,7 +71,7 @@
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#define RPL_CODE_SEC_DAO 0x82 /* DAO message */
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#define RPL_CODE_SEC_DAO_ACK 0x83 /* DAO ACK message */
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/* RPL DIO suboption types */
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/* RPL DIO/DAO suboption types */
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#define RPL_DIO_SUBOPT_PAD1 0 /* Pad1 */
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#define RPL_DIO_SUBOPT_PADN 1 /* PadN */
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#define RPL_DIO_SUBOPT_DAG_MC 2 /* DAG metric container */
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@ -84,6 +84,9 @@
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#define RPL_DIO_SUBOPT_OCP 9 /* 5 in the MC document... */
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#define RPL_DAO_K_FLAG 0x80 /* DAO ACK requested */
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#define RPL_DAO_D_FLAG 0x40 /* DODAG ID Present */
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/*---------------------------------------------------------------------------*/
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/* Default values for RPL constants and variables. */
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@ -127,6 +130,8 @@
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/* Expire DAOs from neighbors that do not respond in this time. (seconds) */
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#define DAO_EXPIRATION_TIMEOUT 60
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/*---------------------------------------------------------------------------*/
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#define RPL_INSTANCE_LOCAL_FLAG 0x80
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#define RPL_INSTANCE_D_FLAG 0x40
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#define RPL_ROUTE_FROM_INTERNAL 0
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#define RPL_ROUTE_FROM_UNICAST_DAO 1
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