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Correctly handle upward and downward routes according to Section 1.2 of RFC6550

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This commit is contained in:
Adam Dunkels 2012-11-26 19:33:54 +01:00
parent 15deb37e64
commit 357b13b3d3
1 changed files with 23 additions and 3 deletions
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26
core/net/rpl/rpl-ext-header.c
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@ -97,9 +97,14 @@ rpl_verify_header(int uip_ext_opt_offset)
down = 1;
}
PRINTF("RPL: Packet going %s\n", down == 1 ? "down" : "up");
sender_closer = UIP_EXT_HDR_OPT_RPL_BUF->senderrank < instance->current_dag->rank;
PRINTF("RPL: Packet going %s, sender closer %d (%d < %d)\n", down == 1 ? "down" : "up",
sender_closer,
UIP_EXT_HDR_OPT_RPL_BUF->senderrank,
instance->current_dag->rank
);
if((down && !sender_closer) || (!down && sender_closer)) {
PRINTF("RPL: Loop detected - senderrank: %d my-rank: %d sender_closer: %d\n",
UIP_EXT_HDR_OPT_RPL_BUF->senderrank, instance->current_dag->rank,
@ -183,7 +188,22 @@ rpl_update_header_empty(void)
switch(UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option\n");
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=instance->current_dag->rank;
UIP_EXT_HDR_OPT_RPL_BUF->senderrank = instance->current_dag->rank;
/* Set the down extension flag correctly as described in Section
11.2 of RFC6550. If the packet progresses along a DAO route,
the down flag should be set. */
if(uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr) == NULL) {
/* No route was found, so this packet will go towards the RPL
root. If so, we should not set the down flag. */
UIP_EXT_HDR_OPT_RPL_BUF->flags &= ~RPL_HDR_OPT_DOWN;
} else {
/* A DAO route was found so we set the down flag. */
UIP_EXT_HDR_OPT_RPL_BUF->flags |= RPL_HDR_OPT_DOWN;
}
uip_ext_len = last_uip_ext_len;
return;
default: