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Merge pull request #300 from cetic/rpl-nopath-dao

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RPL No-Path DAOs
This commit is contained in:
Adam Dunkels 2013-07-26 03:53:56 -07:00
commit 500d9cc3e4
3 changed files with 40 additions and 16 deletions
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41
core/net/rpl/rpl-icmp6.c
View File

@ -655,7 +655,7 @@ dao_input(void)
if(lifetime == RPL_ZERO_LIFETIME) {
/* No-Path DAO received; invoke the route purging routine. */
if(rep != NULL && rep->state.saved_lifetime == 0 && rep->length == prefixlen) {
if(rep != NULL && rep->state.saved_lifetime == 0 && rep->length == prefixlen && uip_ipaddr_cmp(&rep->nexthop, &dao_sender_addr)) {
PRINTF("RPL: Setting expiration timer for prefix ");
PRINT6ADDR(&prefix);
PRINTF("\n");
@ -707,27 +707,36 @@ dao_input(void)
}
/*---------------------------------------------------------------------------*/
void
dao_output(rpl_parent_t *n, uint8_t lifetime)
dao_output(rpl_parent_t *parent, uint8_t lifetime)
{
rpl_dag_t *dag;
rpl_instance_t *instance;
unsigned char *buffer;
uint8_t prefixlen;
uip_ipaddr_t prefix;
int pos;
/* Destination Advertisement Object */
uip_ipaddr_t prefix;
if(get_global_addr(&prefix) == 0) {
PRINTF("RPL: No global address set for this node - suppressing DAO\n");
return;
}
dag = n->dag;
/* Sending a DAO with own prefix as target */
dao_output_target(parent, &prefix, lifetime);
}
/*---------------------------------------------------------------------------*/
void
dao_output_target(rpl_parent_t *parent, uip_ipaddr_t *prefix, uint8_t lifetime)
{
rpl_dag_t *dag;
rpl_instance_t *instance;
unsigned char *buffer;
uint8_t prefixlen;
int pos;
/* Destination Advertisement Object */
dag = parent->dag;
instance = dag->instance;
#ifdef RPL_DEBUG_DAO_OUTPUT
RPL_DEBUG_DAO_OUTPUT(n);
RPL_DEBUG_DAO_OUTPUT(parent);
#endif
buffer = UIP_ICMP_PAYLOAD;
@ -752,12 +761,12 @@ dao_output(rpl_parent_t *n, uint8_t lifetime)
#endif /* RPL_DAO_SPECIFY_DAG */
/* create target subopt */
prefixlen = sizeof(prefix) * CHAR_BIT;
prefixlen = sizeof(*prefix) * CHAR_BIT;
buffer[pos++] = RPL_OPTION_TARGET;
buffer[pos++] = 2 + ((prefixlen + 7) / CHAR_BIT);
buffer[pos++] = 0; /* reserved */
buffer[pos++] = prefixlen;
memcpy(buffer + pos, &prefix, (prefixlen + 7) / CHAR_BIT);
memcpy(buffer + pos, prefix, (prefixlen + 7) / CHAR_BIT);
pos += ((prefixlen + 7) / CHAR_BIT);
/* Create a transit information sub-option. */
@ -769,12 +778,12 @@ dao_output(rpl_parent_t *n, uint8_t lifetime)
buffer[pos++] = lifetime;
PRINTF("RPL: Sending DAO with prefix ");
PRINT6ADDR(&prefix);
PRINT6ADDR(prefix);
PRINTF(" to ");
PRINT6ADDR(&n->addr);
PRINT6ADDR(&parent->addr);
PRINTF("\n");
uip_icmp6_send(&n->addr, ICMP6_RPL, RPL_CODE_DAO, pos);
uip_icmp6_send(&parent->addr, ICMP6_RPL, RPL_CODE_DAO, pos);
}
/*---------------------------------------------------------------------------*/
static void

1
core/net/rpl/rpl-private.h
View File

@ -270,6 +270,7 @@ extern rpl_instance_t *default_instance;
void dis_output(uip_ipaddr_t *addr);
void dio_output(rpl_instance_t *, uip_ipaddr_t *uc_addr);
void dao_output(rpl_parent_t *, uint8_t lifetime);
void dao_output_target(rpl_parent_t *, uip_ipaddr_t *, uint8_t lifetime);
void dao_ack_output(rpl_instance_t *, uip_ipaddr_t *, uint8_t);
/* RPL logic functions. */

14
core/net/rpl/rpl.c
View File

@ -63,6 +63,8 @@ void
rpl_purge_routes(void)
{
uip_ds6_route_t *r;
uip_ipaddr_t prefix;
rpl_dag_t *dag;
/* First pass, decrement lifetime */
r = uip_ds6_route_list_head();
@ -86,8 +88,20 @@ rpl_purge_routes(void)
if(r->state.lifetime < 1) {
/* Routes with lifetime == 1 have only just been decremented from 2 to 1,
* thus we want to keep them. Hence < and not <= */
uip_ipaddr_copy(&prefix, &r->ipaddr);
uip_ds6_route_rm(r);
r = uip_ds6_route_list_head();
PRINTF("No more routes to ");
PRINT6ADDR(&prefix);
dag = default_instance->current_dag;
/* Propagate this information with a No-Path DAO to preferred parent if we are not a RPL Root */
if(dag->rank != ROOT_RANK(default_instance)) {
PRINTF(" -> generate No-Path DAO\n");
dao_output_target(dag->preferred_parent, &prefix, RPL_ZERO_LIFETIME);
/* Don't schedule more than 1 No-Path DAO, let next iteration handle that */
return;
}
PRINTF("\n");
} else {
r = list_item_next(r);
}