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fixed lollipop counter

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This commit is contained in:
Joakim Eriksson 2012-02-21 13:20:20 +01:00
parent 3fe55673d3
commit 2752337e69
2 changed files with 27 additions and 20 deletions
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24
core/net/rpl/rpl-dag.c Executable file → Normal file
View file

@ -99,6 +99,21 @@ MEMB(parent_memb, struct rpl_parent,
rpl_instance_t instance_table[RPL_MAX_INSTANCES];
rpl_instance_t *default_instance;
/************************************************************************/
/* lollipop greater than function. */
/************************************************************************/
int rpl_lollipop_greater_than(int a, int b) {
/* Check if we are comparing an initial value with an old value */
if(a > RPL_LOLLIPOP_CIRCULAR_REGION && b <= RPL_LOLLIPOP_CIRCULAR_REGION) {
return (RPL_LOLLIPOP_MAX_VALUE + 1 + b - a) > RPL_LOLLIPOP_SEQUENCE_WINDOWS;
}
/* Otherwise check if a > b and comparable => ok, or
if they have wrapped and are still comparable */
return (a > b && (a - b) < RPL_LOLLIPOP_SEQUENCE_WINDOWS) ||
(a < b && (b - a) > (RPL_LOLLIPOP_CIRCULAR_REGION + 1-
RPL_LOLLIPOP_SEQUENCE_WINDOWS));
}
/************************************************************************/
/* Remove DAG parents with a rank that is at least the same as minimum_rank. */
static void
@ -161,10 +176,9 @@ should_send_dao(rpl_instance_t *instance, rpl_dio_t *dio, rpl_parent_t *p)
if(instance->mop == RPL_MOP_NO_DOWNWARD_ROUTES) {
return 0;
}
/* check if the new DTSN is more recent */
return p == instance->current_dag->preferred_parent &&
(RPL_LOLLIPOP_GREATER_THAN(dio->dtsn, p->dtsn) ||
((RPL_LOLLIPOP_GREATER_THAN(p->dtsn, dio->dtsn)) &&
RPL_LOLLIPOP_IS_INIT(dio->dtsn)));
(rpl_lollipop_greater_than(dio->dtsn, p->dtsn));
}
/************************************************************************/
static int
@ -1127,7 +1141,7 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
return;
}
if(RPL_LOLLIPOP_GREATER_THAN(dio->version, dag->version)) {
if(rpl_lollipop_greater_than(dio->version, dag->version)) {
if(dag->rank == ROOT_RANK(instance)) {
PRINTF("RPL: Root received inconsistent DIO version number\n");
dag->version = dio->version;
@ -1138,7 +1152,7 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
}
return;
} else {
if(RPL_LOLLIPOP_GREATER_THAN(dag->version, dio->version)) {
if(rpl_lollipop_greater_than(dag->version, dio->version)) {
/* The DIO sender is on an older version of the DAG. */
PRINTF("RPL: old version received => inconsistency detected\n");
if(dag->joined) {

17
core/net/rpl/rpl.h
View file

@ -131,19 +131,12 @@ typedef uint16_t rpl_ocp_t;
#define RPL_LOLLIPOP_CIRCULAR_REGION 127
#define RPL_LOLLIPOP_SEQUENCE_WINDOWS 16
#define RPL_LOLLIPOP_INIT RPL_LOLLIPOP_MAX_VALUE - RPL_LOLLIPOP_SEQUENCE_WINDOWS + 1
#define RPL_LOLLIPOP_INCREMENT(counter) (counter > RPL_LOLLIPOP_CIRCULAR_REGION ?\
(counter == RPL_LOLLIPOP_MAX_VALUE ? counter=0 : ++counter):\
(counter == RPL_LOLLIPOP_CIRCULAR_REGION ? counter=0 : ++counter))
#define RPL_LOLLIPOP_INCREMENT(ctr) (ctr > RPL_LOLLIPOP_CIRCULAR_REGION ? \
++ctr & RPL_LOLLIPOP_MAX_VALUE : \
++ctr & RPL_LOLLIPOP_CIRCULAR_REGION)
#define RPL_LOLLIPOP_IS_INIT(counter) (counter > RPL_LOLLIPOP_CIRCULAR_REGION)
#define RPL_LOLLIPOP_GREATER_THAN_LOCAL(A,B) (((A < B) && (RPL_LOLLIPOP_CIRCULAR_REGION + 1 - B + A < RPL_LOLLIPOP_SEQUENCE_WINDOWS)) || \
((A > B) && (A - B < RPL_LOLLIPOP_SEQUENCE_WINDOWS)))
#define RPL_LOLLIPOP_GREATER_THAN(A,B) ((A > RPL_LOLLIPOP_CIRCULAR_REGION )?\
((B > RPL_LOLLIPOP_CIRCULAR_REGION )?\
RPL_LOLLIPOP_GREATER_THAN_LOCAL(A,B):\
0):\
((B > RPL_LOLLIPOP_CIRCULAR_REGION )?\
1:\
RPL_LOLLIPOP_GREATER_THAN_LOCAL(A,B)))
/*---------------------------------------------------------------------------*/
/* DAG Metric Container Object Types, to be confirmed by IANA. */
#define RPL_DAG_MC_NONE 0 /* Local identifier for empty MC */