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Merge pull request #652 from cetic/pr-rpl-rank-and-fw-errors 

RPL rank and forward errors
This commit is contained in:
Nicolas Tsiftes 2014-12-01 17:41:51 +01:00
parent d0f475de85 35e876e8c6
commit 63563ed8df
5 changed files with 61 additions and 24 deletions
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22
core/net/ipv6/uip-ds6-nbr.c
View File

@ -227,10 +227,32 @@ uip_ds6_neighbor_periodic(void)
switch(nbr->state) {
case NBR_REACHABLE:
if(stimer_expired(&nbr->reachable)) {
#if UIP_CONF_IPV6_RPL
/* when a neighbor leave it's REACHABLE state and is a default router,
instead of going to STALE state it enters DELAY state in order to
force a NUD on it. Otherwise, if there is no upward traffic, the
node never knows if the default router is still reachable. This
mimics the 6LoWPAN-ND behavior.
*/
if(uip_ds6_defrt_lookup(&nbr->ipaddr) != NULL) {
PRINTF("REACHABLE: defrt moving to DELAY (");
PRINT6ADDR(&nbr->ipaddr);
PRINTF(")\n");
nbr->state = NBR_DELAY;
stimer_set(&nbr->reachable, UIP_ND6_DELAY_FIRST_PROBE_TIME);
nbr->nscount = 0;
} else {
PRINTF("REACHABLE: moving to STALE (");
PRINT6ADDR(&nbr->ipaddr);
PRINTF(")\n");
nbr->state = NBR_STALE;
}
#else /* UIP_CONF_IPV6_RPL */
PRINTF("REACHABLE: moving to STALE (");
PRINT6ADDR(&nbr->ipaddr);
PRINTF(")\n");
nbr->state = NBR_STALE;
#endif /* UIP_CONF_IPV6_RPL */
}
break;
#if UIP_ND6_SEND_NA

6
core/net/ipv6/uip6.c
View File

@ -1207,7 +1207,11 @@ uip_process(uint8_t flag)
}
#if UIP_CONF_IPV6_RPL
rpl_update_header_empty();
if(rpl_update_header_empty()) {
/* Packet can not be forwarded */
PRINTF("RPL Forward Option Error\n");
goto drop;
}
#endif /* UIP_CONF_IPV6_RPL */
UIP_IP_BUF->ttl = UIP_IP_BUF->ttl - 1;

7
core/net/rpl/rpl-dag.c
View File

@ -93,6 +93,13 @@ rpl_dag_init(void)
nbr_table_register(rpl_parents, (nbr_table_callback *)nbr_callback);
}
/*---------------------------------------------------------------------------*/
rpl_parent_t *
rpl_get_parent(uip_lladdr_t *addr)
{
rpl_parent_t *p = nbr_table_get_from_lladdr(rpl_parents, (linkaddr_t *)addr);
return p;
}
/*---------------------------------------------------------------------------*/
rpl_rank_t
rpl_get_parent_rank(uip_lladdr_t *addr)
{

47
core/net/rpl/rpl-ext-header.c
View File

@ -48,6 +48,7 @@
#include "net/ip/tcpip.h"
#include "net/ipv6/uip-ds6.h"
#include "net/rpl/rpl-private.h"
#include "net/packetbuf.h"
#define DEBUG DEBUG_NONE
#include "net/ip/uip-debug.h"
@ -105,19 +106,12 @@ rpl_verify_header(int uip_ext_opt_offset)
route = uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr);
if(route != NULL) {
uip_ds6_route_rm(route);
/* If we are the root and just needed to remove a DAO route,
chances are that the network needs to be repaired. The
rpl_repair_root() function will cause a global repair if we
happen to be the root node of the dag. */
PRINTF("RPL: initiate global repair\n");
rpl_repair_root(instance->instance_id);
}
/* Remove the forwarding error flag and return 0 to let the packet
be forwarded again. */
UIP_EXT_HDR_OPT_RPL_BUF->flags &= ~RPL_HDR_OPT_FWD_ERR;
return 0;
RPL_STAT(rpl_stats.forward_errors++);
/* Trigger DAO retransmission */
rpl_reset_dio_timer(instance);
/* drop the packet as it is not routable */
return 1;
}
if(!instance->current_dag->joined) {
@ -145,10 +139,9 @@ rpl_verify_header(int uip_ext_opt_offset)
sender_closer);
if(UIP_EXT_HDR_OPT_RPL_BUF->flags & RPL_HDR_OPT_RANK_ERR) {
PRINTF("RPL: Rank error signalled in RPL option!\n");
/* We should try to repair it, not implemented for the moment */
/* Packet must be dropped and dio trickle timer reset, see RFC6550 - 11.2.2.2 */
rpl_reset_dio_timer(instance);
/* Forward the packet anyway. */
return 0;
return 1;
}
PRINTF("RPL: Single error tolerated\n");
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_RANK_ERR;
@ -183,12 +176,13 @@ set_rpl_opt(unsigned uip_ext_opt_offset)
}
}
/*---------------------------------------------------------------------------*/
void
int
rpl_update_header_empty(void)
{
rpl_instance_t *instance;
int uip_ext_opt_offset;
int last_uip_ext_len;
rpl_parent_t *parent;
last_uip_ext_len = uip_ext_len;
uip_ext_len = 0;
@ -211,12 +205,12 @@ rpl_update_header_empty(void)
if(UIP_EXT_HDR_OPT_RPL_BUF->opt_len != RPL_HDR_OPT_LEN) {
PRINTF("RPL: RPL Hop-by-hop option has wrong length\n");
uip_ext_len = last_uip_ext_len;
return;
return 0;
}
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
if(instance == NULL || !instance->used || !instance->current_dag->joined) {
PRINTF("RPL: Unable to add hop-by-hop extension header: incorrect instance\n");
return;
return 0;
}
break;
default:
@ -224,11 +218,11 @@ rpl_update_header_empty(void)
if(uip_len + RPL_HOP_BY_HOP_LEN > UIP_BUFSIZE) {
PRINTF("RPL: Packet too long: impossible to add hop-by-hop option\n");
uip_ext_len = last_uip_ext_len;
return;
return 0;
}
set_rpl_opt(uip_ext_opt_offset);
uip_ext_len = last_uip_ext_len + RPL_HOP_BY_HOP_LEN;
return;
return 0;
}
switch(UIP_EXT_HDR_OPT_BUF->type) {
@ -244,6 +238,15 @@ rpl_update_header_empty(void)
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_FWD_ERR;
PRINTF("RPL forwarding error\n");
/* We should send back the packet to the originating parent,
but it is not feasible yet, so we send a No-Path DAO instead */
PRINTF("RPL generate No-Path DAO\n");
parent = rpl_get_parent((uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_SENDER));
if(parent != NULL) {
dao_output_target(parent, &UIP_IP_BUF->destipaddr, RPL_ZERO_LIFETIME);
}
/* Drop packet */
return 1;
}
} else {
/* Set the down extension flag correctly as described in Section
@ -262,11 +265,11 @@ rpl_update_header_empty(void)
}
uip_ext_len = last_uip_ext_len;
return;
return 0;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len = last_uip_ext_len;
return;
return 0;
}
}
/*---------------------------------------------------------------------------*/

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

@ -240,13 +240,14 @@ int rpl_repair_root(uint8_t instance_id);
int rpl_set_default_route(rpl_instance_t *instance, uip_ipaddr_t *from);
rpl_dag_t *rpl_get_any_dag(void);
rpl_instance_t *rpl_get_instance(uint8_t instance_id);
void rpl_update_header_empty(void);
int rpl_update_header_empty(void);
int rpl_update_header_final(uip_ipaddr_t *addr);
int rpl_verify_header(int);
void rpl_insert_header(void);
void rpl_remove_header(void);
uint8_t rpl_invert_header(void);
uip_ipaddr_t *rpl_get_parent_ipaddr(rpl_parent_t *nbr);
rpl_parent_t *rpl_get_parent(uip_lladdr_t *addr);
rpl_rank_t rpl_get_parent_rank(uip_lladdr_t *addr);
uint16_t rpl_get_parent_link_metric(const uip_lladdr_t *addr);
void rpl_dag_init(void);