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Removed redundant code and improve code style and documentation.

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This commit is contained in:
nvt 2012-04-22 00:18:07 +02:00
parent e94718f95c
commit 534c734465
3 changed files with 38 additions and 40 deletions
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48
core/net/rpl/rpl-dag.c
View File

@ -88,7 +88,9 @@ rpl_instance_t *default_instance;
/************************************************************************/
/* Greater-than function for the lollipop counter. */
/************************************************************************/
int rpl_lollipop_greater_than(int a, int b) {
static int
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;
@ -163,7 +165,7 @@ should_send_dao(rpl_instance_t *instance, rpl_dio_t *dio, rpl_parent_t *p)
}
/* check if the new DTSN is more recent */
return p == instance->current_dag->preferred_parent &&
(rpl_lollipop_greater_than(dio->dtsn, p->dtsn));
(lollipop_greater_than(dio->dtsn, p->dtsn));
}
/************************************************************************/
static int
@ -418,6 +420,9 @@ rpl_alloc_dag(uint8_t instance_id, uip_ipaddr_t *dag_id)
return dag;
}
}
RPL_STAT(rpl_stats.mem_overflows++);
rpl_free_instance(instance);
return NULL;
}
/************************************************************************/
@ -814,7 +819,7 @@ rpl_join_instance(uip_ipaddr_t *from, rpl_dio_t *dio)
/* Autoconfigure an address if this node does not already have an address
with this prefix. */
if((dio->prefix_info.flags & UIP_ND6_RA_FLAG_AUTONOMOUS)) {
if(dio->prefix_info.flags & UIP_ND6_RA_FLAG_AUTONOMOUS) {
check_prefix(NULL, &dio->prefix_info);
}
@ -825,8 +830,8 @@ rpl_join_instance(uip_ipaddr_t *from, rpl_dio_t *dio)
instance->of = of;
instance->mop = dio->mop;
instance->current_dag = dag;
instance->dtsn_out = RPL_LOLLIPOP_INIT;
instance->instance_id = dio->instance_id;
instance->max_rankinc = dio->dag_max_rankinc;
instance->min_hoprankinc = dio->dag_min_hoprankinc;
@ -839,13 +844,14 @@ rpl_join_instance(uip_ipaddr_t *from, rpl_dio_t *dio)
memcpy(&dag->dag_id, &dio->dag_id, sizeof(dio->dag_id));
/* copy prefix information into the dag */
/* Copy prefix information from the DIO into the DAG object. */
memcpy(&dag->prefix_info, &dio->prefix_info, sizeof(rpl_prefix_t));
dag->preferred_parent = p;
instance->of->update_metric_container(instance);
dag->rank = instance->of->calculate_rank(p, 0);
dag->min_rank = dag->rank; /* So far this is the lowest rank we know of. */
/* So far this is the lowest rank we are aware of. */
dag->min_rank = dag->rank;
if(default_instance == NULL) {
default_instance = instance;
@ -1039,20 +1045,10 @@ rpl_process_parent_event(rpl_instance_t *instance, rpl_parent_t *p)
old_rank = instance->current_dag->rank;
return_value = 1;
if(p->rank == INFINITE_RANK) {
/* This parent is no longer valid */
PRINTF("RPL: This parent is no longer valid \n");
if(p != instance->current_dag->preferred_parent) {
rpl_nullify_parent(p->dag, p);
return 0;
} else {
rpl_nullify_parent(p->dag, p);
return_value = 0;
}
} else if(!acceptable_rank(p->dag, p->rank)) {
if(!acceptable_rank(p->dag, p->rank)) {
/* The candidate parent is no longer valid: the rank increase resulting
from the choice of it as a parent would be too high. */
PRINTF("RPL: Unacceptable rank\n");
PRINTF("RPL: Unacceptable rank %u\n", (unsigned)p->rank);
if(p != instance->current_dag->preferred_parent) {
rpl_nullify_parent(p->dag, p);
return 0;
@ -1120,7 +1116,7 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
return;
}
if(rpl_lollipop_greater_than(dio->version, dag->version)) {
if(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;
@ -1130,8 +1126,9 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
global_repair(from, dag, dio);
}
return;
} else {
if(rpl_lollipop_greater_than(dag->version, dio->version)) {
}
if(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) {
@ -1139,16 +1136,13 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
return;
}
}
}
if(dio->rank == INFINITE_RANK) {
if(dag->joined) {
rpl_reset_dio_timer(instance);
}
} else if(dio->rank < ROOT_RANK(instance)) {
if(dio->rank < ROOT_RANK(instance)) {
PRINTF("RPL: Ignoring DIO with too low rank: %u\n",
(unsigned)dio->rank);
return;
} else if(dio->rank == INFINITE_RANK && dag->joined) {
rpl_reset_dio_timer(instance);
}
if(dag->rank == ROOT_RANK(instance)) {

11
core/net/rpl/rpl-icmp6.c
View File

@ -188,12 +188,14 @@ dis_output(uip_ipaddr_t *addr)
buffer[0] = buffer[1] = 0;
if(addr == NULL) {
PRINTF("RPL: Sending a DIS\n");
uip_create_linklocal_rplnodes_mcast(&tmpaddr);
addr = &tmpaddr;
} else {
PRINTF("RPL: Sending a unicast DIS\n");
}
PRINTF("RPL: Sending a DIS to ");
PRINT6ADDR(addr);
PRINTF("\n");
uip_icmp6_send(addr, ICMP6_RPL, RPL_CODE_DIS, 2);
}
/*---------------------------------------------------------------------------*/
@ -410,7 +412,8 @@ dio_output(rpl_instance_t *instance, uip_ipaddr_t *uc_addr)
#endif /* !RPL_LEAF_ONLY */
#if RPL_LEAF_ONLY
/* only respond to unicast DIS */
/* In leaf mode, we send DIO message only as unicasts in response to
unicast DIS messages. */
if(uc_addr == NULL) {
return;
}

3
core/net/rpl/rpl.c
View File

@ -34,7 +34,8 @@
*/
/**
* \file
* ContikiRPL, an implementation of IETF ROLL RPL.
* ContikiRPL, an implementation of RPL: IPv6 Routing Protocol
* for Low-Power and Lossy Networks (IETF RFC 6550)
*
* \author Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>
*/