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* Add attribute to track bad routes and necessary support for this.

Browse source 
* Revamp forwarding to deal with bad routes or request new routes as
  appropriate.

* Mark bad routes (rather than tossing them) as we are informed by
  other hosts.

* No longer wait two ticks before making route request.
This commit is contained in:
bg- 2007-05-08 08:41:26 +00:00
parent b10eea85f5
commit a207770a1e
1 changed files with 16 additions and 34 deletions
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50
core/net/uaodv.c
View file

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: uaodv.c,v 1.13 2007/05/07 11:51:20 bg- Exp $
* $Id: uaodv.c,v 1.14 2007/05/08 08:41:26 bg- Exp $
*/
/**
@ -72,31 +72,14 @@ static struct uip_udp_conn *bcastconn, *unicastconn;
#define SCMP32(a, b) exit(1)
#endif /* __GNUC__ */
#define NDELETED 4
/*
* Save known seqno:s in network byte order.
*/
static
struct {
uip_ipaddr_t orig;
u32_t seqno;
} lseq[NDELETED];
static CC_INLINE void
save_latest_seqno(const uip_ipaddr_t *originator, const u32_t *seqno)
{
unsigned n = (originator->u8[2] + originator->u8[3]) % NDELETED;
uip_ipaddr_copy(&lseq[n].orig, originator);
lseq[n].seqno = *seqno;
}
static CC_INLINE u32_t
latest_seqno(const uip_ipaddr_t *originator)
last_known_seqno(uip_ipaddr_t *host)
{
unsigned n = (originator->u8[2] + originator->u8[3]) % NDELETED;
if(uip_ipaddr_cmp(&lseq[n].orig, originator))
return lseq[n].seqno;
struct uaodv_rt_entry *route = uaodv_rt_lookup_any(host);
if(route != NULL)
return route->seqno;
return 0;
}
@ -181,7 +164,7 @@ send_rreq(uip_ipaddr_t *addr)
print_debug("send RREQ for %d.%d.%d.%d\n", uip_ipaddr_to_quad(addr));
rm->type = UAODV_RREQ_TYPE;
rm->dest_seqno = latest_seqno(addr);
rm->dest_seqno = last_known_seqno(addr);
if(rm->dest_seqno == 0)
rm->flags = UAODV_RREQ_UNKSEQNO;
else
@ -403,12 +386,14 @@ handle_incoming_rerr(void)
uip_ipaddr_to_quad((uip_ipaddr_t *)&rm->unreach[0]),
ntohl(rm->unreach[0].seqno));
if(uip_ipaddr_cmp(&rm->unreach[0].addr, &uip_hostaddr))
return;
rt = uaodv_rt_lookup(&rm->unreach[0].addr);
if(rt != NULL
&& uip_ipaddr_cmp(&rt->nexthop, uip_udp_sender())
&& SCMP32(rt->seqno, ntohl(rm->unreach[0].seqno)) <= 0) {
save_latest_seqno(&rm->unreach[0].addr, &rm->unreach[0].seqno);
uaodv_rt_remove(rt);
rt->is_bad = 1;
print_debug("RERR rebroadcast\n");
uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rerr));
}
@ -448,10 +433,12 @@ static u32_t bad_seqno; /* In network byte order! */
void
uaodv_bad_route(struct uaodv_rt_entry *rt)
{
u32_t net_seqno = htonl(rt->seqno);
save_latest_seqno(&rt->dest, &net_seqno);
if(rt == NULL)
return;
uip_ipaddr_copy(&bad_dest, &rt->dest);
bad_seqno = htonl(rt->seqno);
rt->is_bad = 1;
command = COMMAND_SEND_RERR;
process_post(&uaodv_process, PROCESS_EVENT_MSG, NULL);
}
@ -525,11 +512,6 @@ PROCESS_THREAD(uaodv_process, ev, data)
}
if(ev == PROCESS_EVENT_MSG) {
#if 1
static struct etimer etimer;
etimer_set(&etimer, 2);
PROCESS_WAIT_UNTIL(etimer_expired(&etimer));
#endif
tcpip_poll_udp(bcastconn);
}
}