/*
* rt_recvfrom - Wrapper for recv_from. Binds received LSA to the sender node
* and returns the pointer to it.
*
* @param sockfd routing daemon socket identifier
* @param forwarder_id pointer to the node id of the forwarder
* @param dl pointer to direct neighbors table
* @param lsa_size size of LSA received
* @return the received LSA
*/
LSA *rt_recvfrom(int sockfd, int *forwarder_id, direct_links *dl, int *lsa_size)
{
struct sockaddr_in cli_addr;
socklen_t clilen;
clilen = sizeof(cli_addr);
char buf[MAX_BUF];
int ret;
LSA *lsa = NULL;
link_entry *forwarder;
ret = recvfrom(sockfd, buf, MAX_LSA_LEN, 0, (struct sockaddr *)&cli_addr, &clilen);
if (ret < 5*sizeof(int))
{
return NULL;
}
lsa = bytes_to_packet( buf, ret);
forwarder = lookup_link_entry(dl, &cli_addr);
*forwarder_id = forwarder->id;
*lsa_size = ret;
return lsa;
}
static void
default_lq_parser_ffeth(struct olsr *olsr, struct interface *in_if, union olsr_ip_addr *from_addr)
{
const union olsr_ip_addr *main_addr;
struct link_entry *lnk;
struct default_lq_ffeth_hello *lq;
uint32_t seq_diff;
/* Find main address */
main_addr = mid_lookup_main_addr(from_addr);
/* Loopup link entry */
lnk = lookup_link_entry(from_addr, main_addr, in_if);
if (lnk == NULL) {
return;
}
lq = (struct default_lq_ffeth_hello *)lnk->linkquality;
/* ignore double package */
if (lq->last_seq_nr == olsr->olsr_seqno) {
struct ipaddr_str buf;
olsr_syslog(OLSR_LOG_INFO, "detected duplicate packet with seqnr %d from %s on %s (%d Bytes)",
olsr->olsr_seqno,olsr_ip_to_string(&buf, from_addr),in_if->int_name,ntohs(olsr->olsr_packlen));
return;
}
if (lq->last_seq_nr > olsr->olsr_seqno) {
seq_diff = (uint32_t) olsr->olsr_seqno + 65536 - lq->last_seq_nr;
} else {
seq_diff = olsr->olsr_seqno - lq->last_seq_nr;
}
/* Jump in sequence numbers ? */
if (seq_diff > 256) {
seq_diff = 1;
}
lq->received[lq->activePtr]++;
lq->total[lq->activePtr] += seq_diff;
lq->last_seq_nr = olsr->olsr_seqno;
lq->missed_hellos = 0;
}
void
update_hysteresis_incoming(union olsr_ip_addr *remote, struct interface *local, uint16_t seqno)
{
struct link_entry *lnk = lookup_link_entry(remote, NULL, local);
/* Calculate new quality */
if (lnk != NULL) {
#ifdef DEBUG
struct ipaddr_str buf;
#endif
lnk->L_link_quality = olsr_hyst_calc_stability(lnk->L_link_quality);
#ifdef DEBUG
OLSR_PRINTF(3, "HYST[%s]: %f\n", olsr_ip_to_string(&buf, remote), lnk->L_link_quality);
#endif
/*
* see how many packets we have missed and update the link quality
* for each missed packet; HELLOs have already been accounted for by
* the timeout function and the number of missed HELLOs has already
* been added to olsr_seqno there
*/
if (lnk->olsr_seqno_valid && (unsigned short)(seqno - lnk->olsr_seqno) < 100)
while (lnk->olsr_seqno != seqno) {
lnk->L_link_quality = olsr_hyst_calc_instability(lnk->L_link_quality);
#ifdef DEBUG
OLSR_PRINTF(5, "HYST[%s] PACKET LOSS! %f\n", olsr_ip_to_string(&buf, remote), lnk->L_link_quality);
#endif
if (lnk->L_link_quality < olsr_cnf->hysteresis_param.thr_low)
break;
lnk->olsr_seqno++;
}
lnk->olsr_seqno = seqno + 1;
lnk->olsr_seqno_valid = true;
//printf("Updating seqno to: %d\n", lnk->olsr_seqno);
}
return;
}
