#ifdef DEBUG
fprintf(stderr, "sending Hello from %d at %.2f\n", index, Scheduler::instance().clock());
#endif // DEBUG

rh->rp_type = AODVTYPE_HELLO;
//rh->rp_flags = 0x00;
rh->rp_hop_count = 1;
rh->rp_dst = index;
rh->rp_dst_seqno = seqno;
rh->rp_lifetime = (1 + ALLOWED_HELLO_LOSS) * HELLO_INTERVAL;

// ch->uid() = 0;
ch->ptype() = PT_AODV;
ch->size() = IP_HDR_LEN + rh->size();
ch->iface() = -2;
ch->error() = 0;
ch->addr_type() = NS_AF_NONE;
ch->prev_hop_ = index; // AODV hack

ih->saddr() = index;
ih->daddr() = IP_BROADCAST;
ih->sport() = RT_PORT;
ih->dport() = RT_PORT;
ih->ttl_ = 1;

Scheduler::instance().schedule(target_, p, 0.0);
}

void
AODV::recvHello(Packet *p) {
//struct hdr_ip *ih = HDR_IP(p);
struct hdr_aodv_reply *rp = HDR_AODV_REPLY(p);
AODV_Neighbor *nb;

nb = nb_lookup(rp->rp_dst);
if(nb == 0) {
nb_insert(rp->rp_dst);
}
else {
nb->nb_expire = CURRENT_TIME +
(1.5 * ALLOWED_HELLO_LOSS * HELLO_INTERVAL);
}

Packet::free(p);
}

void
AODV::nb_insert(nsaddr_t id) {
AODV_Neighbor *nb = new AODV_Neighbor(id);

assert(nb);
nb->nb_expire = CURRENT_TIME +
(1.5 * ALLOWED_HELLO_LOSS * HELLO_INTERVAL);
LIST_INSERT_HEAD(&nbhead, nb, nb_link);
seqno += 2; // set of neighbors changed
assert ((seqno%2) == 0);
}

AODV_Neighbor*
AODV::nb_lookup(nsaddr_t id) {
AODV_Neighbor *nb = nbhead.lh_first;

for(; nb; nb = nb->nb_link.le_next) {
if(nb->nb_addr == id) break;
}
return nb;
}

/*
* Called when we receive *explicit* notification that a Neighbor
* is no longer reachable.
*/
void
AODV::nb_delete(nsaddr_t id) {
AODV_Neighbor *nb = nbhead.lh_first;

log_link_del(id);
seqno += 2; // Set of neighbors changed
assert ((seqno%2) == 0);

for(; nb; nb = nb->nb_link.le_next) {
if(nb->nb_addr == id) {
LIST_REMOVE(nb,nb_link);
delete nb;
break;
}
}

handle_link_failure(id);

}

/*
* Purges all timed-out Neighbor Entries - runs every
* HELLO_INTERVAL * 1.5 seconds.
*/
void
AODV::nb_purge() {
AODV_Neighbor *nb = nbhead.lh_first;
AODV_Neighbor *nbn;
double now = CURRENT_TIME;

for(; nb; nb = nbn) {
nbn = nb->nb_link.le_next;
if(nb->nb_expire <= now) {
nb_delete(nb->nb_addr);
}
}

}