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No-Path DAO Propagation
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4108066f0a
commit
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@ -709,20 +709,28 @@ dao_input(void)
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void
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void
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dao_output(rpl_parent_t *n, uint8_t lifetime)
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dao_output(rpl_parent_t *n, uint8_t lifetime)
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{
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{
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rpl_dag_t *dag;
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rpl_instance_t *instance;
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unsigned char *buffer;
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uint8_t prefixlen;
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uip_ipaddr_t prefix;
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int pos;
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/* Destination Advertisement Object */
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/* Destination Advertisement Object */
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uip_ipaddr_t prefix;
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if(get_global_addr(&prefix) == 0) {
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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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PRINTF("RPL: No global address set for this node - suppressing DAO\n");
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return;
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return;
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}
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}
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dao_output_target(n, &prefix, lifetime);
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}
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/*---------------------------------------------------------------------------*/
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void
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dao_output_target(rpl_parent_t *n, uip_ipaddr_t *prefix, uint8_t lifetime)
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{
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rpl_dag_t *dag;
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rpl_instance_t *instance;
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unsigned char *buffer;
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uint8_t prefixlen;
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int pos;
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/* Destination Advertisement Object */
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dag = n->dag;
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dag = n->dag;
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instance = dag->instance;
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instance = dag->instance;
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@ -752,12 +760,12 @@ dao_output(rpl_parent_t *n, uint8_t lifetime)
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#endif /* RPL_DAO_SPECIFY_DAG */
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#endif /* RPL_DAO_SPECIFY_DAG */
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/* create target subopt */
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/* create target subopt */
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prefixlen = sizeof(prefix) * CHAR_BIT;
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prefixlen = sizeof(*prefix) * CHAR_BIT;
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buffer[pos++] = RPL_OPTION_TARGET;
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buffer[pos++] = RPL_OPTION_TARGET;
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buffer[pos++] = 2 + ((prefixlen + 7) / CHAR_BIT);
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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++] = 0; /* reserved */
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buffer[pos++] = prefixlen;
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buffer[pos++] = prefixlen;
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memcpy(buffer + pos, &prefix, (prefixlen + 7) / CHAR_BIT);
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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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pos += ((prefixlen + 7) / CHAR_BIT);
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/* Create a transit information sub-option. */
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/* Create a transit information sub-option. */
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@ -769,7 +777,7 @@ dao_output(rpl_parent_t *n, uint8_t lifetime)
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buffer[pos++] = lifetime;
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buffer[pos++] = lifetime;
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PRINTF("RPL: Sending DAO with prefix ");
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PRINTF("RPL: Sending DAO with prefix ");
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PRINT6ADDR(&prefix);
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PRINT6ADDR(prefix);
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PRINTF(" to ");
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PRINTF(" to ");
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PRINT6ADDR(&n->addr);
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PRINT6ADDR(&n->addr);
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PRINTF("\n");
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PRINTF("\n");
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@ -270,6 +270,7 @@ extern rpl_instance_t *default_instance;
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void dis_output(uip_ipaddr_t *addr);
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void dis_output(uip_ipaddr_t *addr);
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void dio_output(rpl_instance_t *, uip_ipaddr_t *uc_addr);
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void dio_output(rpl_instance_t *, uip_ipaddr_t *uc_addr);
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void dao_output(rpl_parent_t *, uint8_t lifetime);
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void dao_output(rpl_parent_t *, uint8_t lifetime);
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void dao_output_target(rpl_parent_t *, uip_ipaddr_t *, uint8_t lifetime);
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void dao_ack_output(rpl_instance_t *, uip_ipaddr_t *, uint8_t);
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void dao_ack_output(rpl_instance_t *, uip_ipaddr_t *, uint8_t);
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/* RPL logic functions. */
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/* RPL logic functions. */
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@ -63,6 +63,8 @@ void
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rpl_purge_routes(void)
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rpl_purge_routes(void)
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{
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{
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uip_ds6_route_t *r;
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uip_ds6_route_t *r;
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uip_ipaddr_t prefix;
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rpl_dag_t *dag;
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/* First pass, decrement lifetime */
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/* First pass, decrement lifetime */
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r = uip_ds6_route_list_head();
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r = uip_ds6_route_list_head();
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@ -86,8 +88,20 @@ rpl_purge_routes(void)
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if(r->state.lifetime < 1) {
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if(r->state.lifetime < 1) {
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/* Routes with lifetime == 1 have only just been decremented from 2 to 1,
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/* Routes with lifetime == 1 have only just been decremented from 2 to 1,
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* thus we want to keep them. Hence < and not <= */
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* thus we want to keep them. Hence < and not <= */
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uip_ipaddr_copy(&prefix, &r->ipaddr);
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uip_ds6_route_rm(r);
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uip_ds6_route_rm(r);
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r = uip_ds6_route_list_head();
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r = uip_ds6_route_list_head();
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PRINTF("No more routes to ");
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PRINT6ADDR(&prefix);
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dag = default_instance->current_dag;
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/* Propagate this information with a No-Path DAO to preferred parent if we are not a RPL Root */
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if(dag->rank != ROOT_RANK(default_instance)) {
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PRINTF(" -> generate No-Path DAO\n");
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dao_output_target(dag->preferred_parent, &prefix, RPL_ZERO_LIFETIME);
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/* Don't schedule more than 1 No-Path DAO, let next iteration handle that */
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return;
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}
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PRINTF("\n");
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} else {
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} else {
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r = list_item_next(r);
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r = list_item_next(r);
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}
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}
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