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net: rpl: Send DAO-ACK if we are the root node

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Instead of always forwarding the DAO, send DAO-ACK if we are
the root node.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2017-08-07 12:23:07 +03:00
commit 75c1189ffb
1 changed files with 33 additions and 0 deletions
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33
subsys/net/ip/rpl.c
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@ -3286,6 +3286,23 @@ static int forwarding_dao(struct net_rpl_instance *instance,
return r;
}
static bool is_root(struct net_rpl_instance *instance)
{
if (!(instance && instance->current_dag)) {
return false;
}
if (instance->current_dag->preferred_parent) {
return false;
}
if (instance->current_dag->rank != NET_RPL_ROOT_RANK(instance)) {
return false;
}
return true;
}
static enum net_verdict handle_dao(struct net_pkt *pkt)
{
struct in6_addr *dao_sender = &NET_IPV6_HDR(pkt)->src;
@ -3567,6 +3584,22 @@ fwd_dao:
net_pkt_unref(pkt);
return NET_OK;
}
} else {
if (IS_ENABLED(CONFIG_NET_RPL_DAO_ACK) &&
(flags & NET_RPL_DAO_K_FLAG) &&
is_root(instance)) {
r = dao_ack_send(&NET_IPV6_HDR(pkt)->dst,
&NET_IPV6_HDR(pkt)->src,
net_pkt_iface(pkt),
instance, sequence, 0);
if (r >= 0) {
NET_DBG("Sending DAO-ACK to %s",
net_sprint_ipv6_addr(
&NET_IPV6_HDR(pkt)->src));
net_pkt_unref(pkt);
return NET_OK;
}
}
}
}