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* Rename field reserved to prefix_sz.

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* Literal constant RSSI_THRESHOLD.

* Send fake RREPs to implementations that insist on sending HELLOs.

* Ignore and clear ACK flag in RREPs.
This commit is contained in:
bg- 2007-05-21 15:26:57 +00:00
parent 0d908b24c8
commit 6c19bed556
1 changed files with 33 additions and 11 deletions
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44
core/net/uaodv.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: uaodv.c,v 1.21 2007/05/20 20:08:28 fros4943 Exp $
* $Id: uaodv.c,v 1.22 2007/05/21 15:26:57 bg- Exp $
*/
/**
@ -51,6 +51,7 @@
#ifdef CC2420_RADIO
#include "dev/cc2420.h"
#define RSSI_THRESHOLD -39 /* accept -39 ... xx */
#endif
/* This implementation never expires routes!!! */
@ -181,7 +182,7 @@ send_rrep(uip_ipaddr_t *dest, uip_ipaddr_t *nexthop, uip_ipaddr_t *orig,
rm->type = UAODV_RREP_TYPE;
rm->flags = 0;
rm->reserved = 0;
rm->prefix_sz = 0; /* I.e a /32 route. */
rm->hop_count = hop_count;
uip_ipaddr_copy(&rm->orig_addr, orig);
rm->dest_seqno = *seqno;
@ -239,7 +240,7 @@ handle_incoming_rreq(void)
return;
} else if (ret == REMOTE_NO) {
/* Is neigbour, accept it. */
} else if(cc2420_last_rssi <= -40) {
} else if(cc2420_last_rssi < RSSI_THRESHOLD) {
print_debug("RREQ drop %d %d\n", cc2420_last_rssi,
cc2420_last_correlation);
return;
@ -316,6 +317,29 @@ handle_incoming_rrep(void)
struct uaodv_msg_rrep *rm = (struct uaodv_msg_rrep *)uip_appdata;
struct uaodv_rt_entry *rt;
/*
* Send a fake RREP in response to HELLOs.
*/
if(uip_ipaddr_cmp(&BUF->destipaddr, &uip_broadcast_addr)) {
u32_t net_seqno;
#ifdef CC2420_RADIO
int ret = cc2420_check_remote(uip_udp_sender()->u16[1]);
if(ret == REMOTE_YES) {
print_debug("HELLO drop is remote\n");
return;
} else if (ret == REMOTE_NO) {
/* Is neigbour, accept it. */
} else if(cc2420_last_rssi < RSSI_THRESHOLD) {
print_debug("HELLO drop %d %d\n", cc2420_last_rssi, cc2420_last_correlation);
return;
}
#endif
net_seqno = htonl(my_hseqno);
send_rrep(&uip_hostaddr, &BUF->srcipaddr, &BUF->srcipaddr, &net_seqno, 0);
return;
}
print_debug("RREP %d.%d.%d.%d -> %d.%d.%d.%d"
" dest=%d.%d.%d.%d seq=%lu hops=%u orig=%d.%d.%d.%d\n",
uip_ipaddr_to_quad(&BUF->srcipaddr),
@ -326,9 +350,6 @@ handle_incoming_rrep(void)
rt = uaodv_rt_lookup(&rm->dest_addr);
print_debug("RREP received dst=%d.%d.%d.%d rt=%p\n",
uip_ipaddr_to_quad(&rm->dest_addr), rt);
/* New forward route? */
if(rt == NULL || (SCMP32(ntohl(rm->dest_seqno), rt->hseqno) > 0)) {
print_debug("Inserting3\n");
@ -344,15 +365,16 @@ handle_incoming_rrep(void)
print_debug("Not inserting\n");
}
if(rm->flags & UAODV_RREP_ACK) {
print_debug("RREP with ACK request (ignored)!\n");
/* Don't want any RREP-ACKs in return! */
rm->flags &= ~UAODV_RREP_ACK;
}
/* Forward RREP towards originator? */
if(uip_ipaddr_cmp(&rm->orig_addr, &uip_hostaddr)) {
print_debug("------- COMPLETE ROUTE FOUND\n");
} else {
if(uip_ipaddr_cmp(&BUF->destipaddr, &uip_broadcast_addr)) {
print_debug("RREP hello received?\n");
return;
}
rt = uaodv_rt_lookup(&rm->orig_addr);
if(rt == NULL) {