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* Keep track of last known seqno. Send last known seqno in RREQs.
* If we have rebooted, bump seqno (gleaned from RREQs). * Reworked filtering of RREQs. * Use last known seqno check before responding to RREQ that we have a route for. Never graft onto an existing but old route.
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126
core/net/uaodv.c
126
core/net/uaodv.c
@ -28,7 +28,7 @@
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: uaodv.c,v 1.12 2007/04/30 15:26:09 bg- Exp $
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* $Id: uaodv.c,v 1.13 2007/05/07 11:51:20 bg- Exp $
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*/
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/**
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@ -46,6 +46,9 @@
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#include "net/uaodv-def.h"
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#include "net/uaodv-rt.h"
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#define NDEBUG
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#include "lib/assert.h"
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#ifdef CC2420_RADIO
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#include "dev/cc2420.h"
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#endif
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@ -69,6 +72,34 @@ static struct uip_udp_conn *bcastconn, *unicastconn;
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#define SCMP32(a, b) exit(1)
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#endif /* __GNUC__ */
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#define NDELETED 4
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/*
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* Save known seqno:s in network byte order.
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*/
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static
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struct {
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uip_ipaddr_t orig;
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u32_t seqno;
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} lseq[NDELETED];
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static CC_INLINE void
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save_latest_seqno(const uip_ipaddr_t *originator, const u32_t *seqno)
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{
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unsigned n = (originator->u8[2] + originator->u8[3]) % NDELETED;
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uip_ipaddr_copy(&lseq[n].orig, originator);
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lseq[n].seqno = *seqno;
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}
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static CC_INLINE u32_t
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latest_seqno(const uip_ipaddr_t *originator)
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{
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unsigned n = (originator->u8[2] + originator->u8[3]) % NDELETED;
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if(uip_ipaddr_cmp(&lseq[n].orig, originator))
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return lseq[n].seqno;
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return 0;
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}
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/*
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* When possible, keep state across reboots.
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*/
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@ -101,7 +132,7 @@ fwc_add(const uip_ipaddr_t *orig, const u32_t *id)
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fwcache[n].orig = *orig;
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}
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#if 0
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#ifdef NDEBUG
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#define PRINTF(...) do {} while (0)
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#define print_debug(...) do{}while(0)
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#else
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@ -150,12 +181,15 @@ send_rreq(uip_ipaddr_t *addr)
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print_debug("send RREQ for %d.%d.%d.%d\n", uip_ipaddr_to_quad(addr));
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rm->type = UAODV_RREQ_TYPE;
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rm->dest_seqno = latest_seqno(addr);
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if(rm->dest_seqno == 0)
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rm->flags = UAODV_RREQ_UNKSEQNO;
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else
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rm->flags = 0;
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rm->reserved = 0;
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rm->hop_count = 0;
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rm->rreq_id = htonl(rreq_id++);
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uip_ipaddr_copy(&rm->dest_addr, addr);
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rm->dest_seqno = 0; /* UNKSEQNO */
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uip_gethostaddr(&rm->orig_addr);
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rreq_seqno++; /* Always */
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rm->orig_seqno = htonl(rreq_seqno);
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@ -176,7 +210,7 @@ send_rrep(uip_ipaddr_t *dest, uip_ipaddr_t *nexthop, uip_ipaddr_t *orig,
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rm->reserved = 0;
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rm->hop_count = hop_count;
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uip_ipaddr_copy(&rm->orig_addr, orig);
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rm->dest_seqno = htonl(*seqno);
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rm->dest_seqno = *seqno;
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uip_ipaddr_copy(&rm->dest_addr, dest);
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rm->lifetime = HTONL(MY_ROUTE_TIMEOUT);
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sendto(nexthop, rm, sizeof(struct uaodv_msg_rrep));
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@ -215,25 +249,26 @@ handle_incoming_rreq(void)
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rm->hop_count,
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uip_ipaddr_to_quad(&rm->dest_addr), ntohl(rm->dest_seqno));
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#ifdef CC2420_RADIO
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if(cc2420_last_rssi <= -38 || cc2420_last_correlation < 100) {
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print_debug("RREQ drop %d %d\n", cc2420_last_rssi,cc2420_last_correlation);
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return;
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if(uip_ipaddr_cmp(&rm->orig_addr, &uip_hostaddr)) {
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return; /* RREQ looped back! */
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}
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if(cc2420_check_remote(uip_udp_sender()->u16[1]) == REMOTE_YES) {
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#ifdef CC2420_RADIO
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{
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int ret = cc2420_check_remote(uip_udp_sender()->u16[1]);
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if(ret == REMOTE_YES) {
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print_debug("RREQ drop is remote\n");
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return;
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}
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#endif
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/* Have we seen this RREQ before? */
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if(uip_ipaddr_cmp(&rm->orig_addr, &uip_hostaddr)
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|| fwc_lookup(&rm->orig_addr, &rm->rreq_id)) {
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print_debug("Not fwd rreq\n");
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} else if (ret == REMOTE_NO) {
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/* Is neigbour, accept it. */
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} else if(cc2420_last_rssi <= -38 || cc2420_last_correlation < 100) {
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print_debug("RREQ drop %d %d\n",
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cc2420_last_rssi,cc2420_last_correlation);
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return;
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}
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fwc_add(&rm->orig_addr, &rm->rreq_id);
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}
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#endif
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/* New reverse route? */
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rt = uaodv_rt_lookup(&rm->orig_addr);
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@ -246,21 +281,51 @@ handle_incoming_rreq(void)
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rm->hop_count, ntohl(rm->orig_seqno));
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}
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/* Check if it is for our address or an existing route. */
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if(uip_ipaddr_cmp(&rm->dest_addr, &uip_hostaddr)
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|| (fw = uaodv_rt_lookup(&rm->dest_addr)) != NULL) {
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print_debug("RREQ for known address\n");
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/* Send an RREP back to the source of the RREQ. */
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/* Check if it is for our address or a fresh route. */
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if(uip_ipaddr_cmp(&rm->dest_addr, &uip_hostaddr)) {
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fw = NULL;
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} else {
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fw = uaodv_rt_lookup(&rm->dest_addr);
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if(!(rm->flags & UAODV_RREQ_UNKSEQNO)
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&& fw != NULL
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&& SCMP32(ntohl(rm->dest_seqno), fw->seqno) >= 0) {
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fw = NULL;
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}
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}
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if (fw != NULL) {
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u32_t net_seqno;
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print_debug("RREQ for known route\n");
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uip_ipaddr_copy(&dest_addr, &rm->dest_addr);
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uip_ipaddr_copy(&orig_addr, &rm->orig_addr);
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if(fw != NULL) /* Existing route. */
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send_rrep(&dest_addr, &rt->nexthop, &orig_addr,
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&fw->seqno, fw->hop_count + 1);
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else {
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rreq_seqno++; /* XXX Not really always. */
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send_rrep(&dest_addr, &rt->nexthop, &orig_addr, &rreq_seqno, 0);
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}
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net_seqno = htonl(fw->seqno);
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send_rrep(&dest_addr, &rt->nexthop, &orig_addr, &net_seqno,
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fw->hop_count + 1);
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} else if(uip_ipaddr_cmp(&rm->dest_addr, &uip_hostaddr)) {
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u32_t net_seqno;
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print_debug("RREQ for our address\n");
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uip_ipaddr_copy(&dest_addr, &rm->dest_addr);
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uip_ipaddr_copy(&orig_addr, &rm->orig_addr);
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if(!(rm->flags & UAODV_RREQ_UNKSEQNO)
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&& SCMP32(rreq_seqno, ntohl(rm->dest_seqno)) < 0) {
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print_debug("New rreq_seqno\n"); /* We must have rebooted. */
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rreq_seqno = ntohl(rm->dest_seqno) + 1;
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} else {
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rreq_seqno++;
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}
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net_seqno = htonl(rreq_seqno);
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send_rrep(&dest_addr, &rt->nexthop, &orig_addr, &net_seqno, 0);
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} else {
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/* Have we seen this RREQ before? */
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if(fwc_lookup(&rm->orig_addr, &rm->rreq_id)) {
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print_debug("RREQ cached, not fwd\n");
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return;
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}
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fwc_add(&rm->orig_addr, &rm->rreq_id);
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print_debug("RREQ fwd\n");
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rm->hop_count++;
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uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rreq));
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@ -342,6 +407,7 @@ handle_incoming_rerr(void)
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if(rt != NULL
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&& uip_ipaddr_cmp(&rt->nexthop, uip_udp_sender())
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&& SCMP32(rt->seqno, ntohl(rm->unreach[0].seqno)) <= 0) {
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save_latest_seqno(&rm->unreach[0].addr, &rm->unreach[0].seqno);
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uaodv_rt_remove(rt);
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print_debug("RERR rebroadcast\n");
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uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rerr));
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@ -382,6 +448,8 @@ static u32_t bad_seqno; /* In network byte order! */
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void
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uaodv_bad_route(struct uaodv_rt_entry *rt)
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{
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u32_t net_seqno = htonl(rt->seqno);
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save_latest_seqno(&rt->dest, &net_seqno);
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uip_ipaddr_copy(&bad_dest, &rt->dest);
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bad_seqno = htonl(rt->seqno);
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command = COMMAND_SEND_RERR;
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