* Major overhaul in order to support route sequence numbers.
* Changes to use network byte order. * Add RREQ forwading cache. * Fix some const:ness and casts. * RERR shall only delete old routes. * Filter RREQ:s also using cc2420_check_remote(). * LRU management of routes.
This commit is contained in:
bg-
parent
95ea7bdff1
commit
9c8f01be41
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@ -44,7 +44,7 @@ cc2420_send_uaodv(void)
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else
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next_gw = &uip_draddr; /* Default router. */
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if (cc2420_check_remote(next_gw->u16[1]) == 0)
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if (cc2420_check_remote(next_gw->u16[1]) == REMOTE_NO)
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h.dst = next_gw->u16[1]; /* local, use ucast */
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else { /* remote or unknown */
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struct uaodv_rt_entry *route = uaodv_request_route_to(next_gw);
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222
core/net/uaodv.c
222
core/net/uaodv.c
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@ -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 1.4 2007/02/01 14:33:05 bg- Exp $
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* $Id: uaodv.c,v 1.5 2007/04/04 12:12:39 bg- Exp $
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*/
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/**
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@ -56,13 +56,42 @@ PROCESS(uaodv_process, "uAODV");
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static struct uip_udp_conn *aodvconn, *unicastconn;
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static u32_t rreq_id, rreq_seqno;
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/* Compare sequence numbers. */
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#define SCMP32(a, b) ((int32_t)((a) - (b)))
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static uip_ipaddr_t last_rreq_originator;
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static u32_t last_rreq_id;
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/*
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* When possible, keep state across reboots.
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*/
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#ifdef __GNUC__
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#define NOINIT __attribute__((section(".noinit")))
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#else
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#define NOINIT
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#endif
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NOINIT static u32_t rreq_id, rreq_seqno;
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#define NFWCACHE 16
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#if 1
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static struct {
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uip_ipaddr_t orig;
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u32_t id;
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} fwcache[NFWCACHE];
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static inline int
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fwc_lookup(uip_ipaddr_t *orig, u32_t *id)
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{
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unsigned n = (orig->u8[2] + orig->u8[3]) % NFWCACHE;
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return fwcache[n].id == *id && uip_ipaddr_cmp(&fwcache[n].orig, orig);
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}
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static inline void
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fwc_add(uip_ipaddr_t *orig, u32_t *id)
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{
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unsigned n = orig->u8[3] % NFWCACHE;
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fwcache[n].id = *id;
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fwcache[n].orig = *orig;
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}
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#if 0
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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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@ -86,7 +115,7 @@ print_debug(const char *fmt, ...)
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/*---------------------------------------------------------------------------*/
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static void
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sendto(const uip_ipaddr_t *dest, char *buf, int len)
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sendto(const uip_ipaddr_t *dest, const void *buf, int len)
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{
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/* XXX: this is a HACK! We're updating the uIP UDP connection
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"unicastconn" so that the destination address is the next-hop,
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@ -109,22 +138,17 @@ send_rreq(uip_ipaddr_t *addr)
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rm->flags = UAODV_RREQ_UNKSEQNO;
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rm->reserved = 0;
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rm->hop_count = 0;
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rm->rreq_id = rreq_id;
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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;
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uip_gethostaddr(&rm->src_addr);
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rm->src_seqno = rreq_seqno;
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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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uip_send((char *)rm, sizeof(struct uaodv_msg_rreq));
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++rreq_seqno;
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++rreq_id;
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uip_ipaddr_copy(&last_rreq_originator, &rm->src_addr);
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last_rreq_id = rm->rreq_id;
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_rrep(uip_ipaddr_t *dst, uip_ipaddr_t *nexthop, uip_ipaddr_t *src, u32_t seqno)
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send_rrep(uip_ipaddr_t *dest, uip_ipaddr_t *nexthop, uip_ipaddr_t *orig, u32_t seqno)
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{
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struct uaodv_msg_rrep *rm = (struct uaodv_msg_rrep *)uip_appdata;
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@ -132,18 +156,18 @@ send_rrep(uip_ipaddr_t *dst, uip_ipaddr_t *nexthop, uip_ipaddr_t *src, u32_t seq
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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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uip_ipaddr_copy(&rm->src_addr, src);
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rm->dest_seqno = seqno;
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uip_ipaddr_copy(&rm->dest_addr, dst);
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rm->lifetime = MY_ROUTE_TIMEOUT;
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sendto(nexthop, (char *)rm, sizeof(struct uaodv_msg_rrep));
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uip_ipaddr_copy(&rm->orig_addr, orig);
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rm->dest_seqno = htonl(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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print_debug("Sending RREP to %d.%d.%d.%d\n", uip_ipaddr_to_quad(nexthop));
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}
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/*---------------------------------------------------------------------------*/
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#ifdef UAODV_BAD_ROUTE
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static void
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send_rerr(uip_ipaddr_t *addr, u32_t seqno)
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send_rerr(uip_ipaddr_t *addr, u32_t *seqno)
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{
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struct uaodv_msg_rerr *rm = (struct uaodv_msg_rerr *)uip_appdata;
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rm->reserved = 0;
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rm->dest_count = 1;
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uip_ipaddr_copy(&rm->unreach[0].addr, addr);
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rm->unreach[0].seqno = seqno;
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rm->unreach[0].seqno = *seqno;
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sendto(&uip_broadcast_addr, (char *)rm, sizeof(struct uaodv_msg_rerr));
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sendto(&uip_broadcast_addr, rm, sizeof(struct uaodv_msg_rerr));
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print_debug("Broadcasting initial RERR for %d.%d.%d.%d\n",
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uip_ipaddr_to_quad(addr));
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handle_incoming_rreq(void)
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{
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struct uaodv_msg_rreq *rm = (struct uaodv_msg_rreq *)uip_appdata;
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uip_ipaddr_t dest_addr, src_addr;
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uip_ipaddr_t dest_addr, orig_addr;
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struct uaodv_rt_entry *rt;
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#ifdef CC2420_RADIO
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if(cc2420_last_rssi <= -38 || cc2420_last_correlation < 100) {
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PRINTF("RREQ drop from %d.%d.%d.%d %d %d \n",
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print_debug("RREQ drop from %d.%d.%d.%d %d %d \n",
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uip_ipaddr_to_quad(uip_udp_sender()),
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cc2420_last_rssi,
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cc2420_last_correlation);
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return;
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}
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if(cc2420_check_remote(uip_udp_sender()->u16[1]) == REMOTE_YES) {
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print_debug("RREQ drop from %d.%d.%d.%d is remote\n",
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uip_ipaddr_to_quad(uip_udp_sender()));
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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 from %d.%d.%d.%d orig_addr %d.%d.%d.%d, rreq_id %lu\n",
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uip_ipaddr_to_quad(uip_udp_sender()),
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uip_ipaddr_to_quad(&rm->orig_addr),
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ntohl(rm->rreq_id));
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return;
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}
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/* New reverse route? */
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rt = uaodv_rt_lookup(&rm->orig_addr);
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if(rt == NULL
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|| (SCMP32(ntohl(rm->orig_seqno), rt->seqno) > 0) /* New route. */
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|| (SCMP32(ntohl(rm->orig_seqno), rt->seqno) == 0
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&& rm->hop_count < rt->hop_count)) { /* Better route. */
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print_debug("Inserting1 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d, hop_count %u seq %lu\n",
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uip_ipaddr_to_quad(&rm->orig_addr),
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uip_ipaddr_to_quad(uip_udp_sender()),
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rm->hop_count,
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ntohl(rm->orig_seqno));
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rt = uaodv_rt_add(&rm->orig_addr, uip_udp_sender(),
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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. */
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if(uip_ipaddr_cmp(&rm->dest_addr, &uip_hostaddr)) {
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rt = uaodv_rt_lookup(&rm->src_addr);
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print_debug("RREQ for our address! rt=%p\n", rt);
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if(rt == NULL) {
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/* Insert originator into routing table. */
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print_debug("Inserting1 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d., hop_count %d\n",
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uip_ipaddr_to_quad(&rm->src_addr),
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uip_ipaddr_to_quad(uip_udp_sender()),
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rm->hop_count);
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uaodv_rt_add(&rm->src_addr, uip_udp_sender(), rm->hop_count, 0);
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}
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/* Send an RREP back to the source of the RREQ. */
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uip_ipaddr_copy(&dest_addr, &rm->dest_addr);
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uip_ipaddr_copy( &src_addr, &rm->src_addr );
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send_rrep(&dest_addr, uip_udp_sender(), &src_addr, rm->src_seqno);
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} else if(!uip_ipaddr_cmp(&last_rreq_originator, &rm->src_addr) ||
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last_rreq_id != rm->rreq_id) {
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print_debug("RREQ for %d.%d.%d.%d!\n", uip_ipaddr_to_quad(&rm->dest_addr));
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rt = uaodv_rt_lookup(&rm->src_addr);
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if(rt == NULL) {
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/* Insert originator into routing table. */
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print_debug("Inserting2 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d., hop_count %d\n",
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uip_ipaddr_to_quad(&rm->src_addr),
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uip_ipaddr_to_quad(uip_udp_sender()),
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rm->hop_count);
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uaodv_rt_add(&rm->src_addr, uip_udp_sender(), rm->hop_count, 0);
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}
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/* Forward RREQ. XXX to be compliant, we should check the TTL
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of the incoming packet and forward only if TTL > 1. We
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should also set the TTL in our outgoing IP header too, but
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there currently is no way of doing this in Contiki so we
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don't do it at the moment. */
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print_debug("Forwarding RREQ to %d.%d.%d.%d ttl=%d\n",
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uip_ipaddr_to_quad(&rm->src_addr),
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uip_ipaddr_copy(&orig_addr, &rm->orig_addr);
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rreq_seqno++; /* XXX Not really always. */
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#ifdef CC2420_RADIO
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if(cc2420_check_remote(rt->nexthop.u16[1]) == REMOTE_MAYBE)
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cc2420_recv_ok(&rt->nexthop);
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#endif
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send_rrep(&dest_addr, &rt->nexthop, &orig_addr, rreq_seqno);
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} else {
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print_debug("RREQ for %d.%d.%d.%d orig %d.%d.%d.%d ttl=%d\n",
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uip_ipaddr_to_quad(&rm->dest_addr),
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uip_ipaddr_to_quad(&rm->orig_addr),
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uip_udp_conn->ttl);
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uip_ipaddr_copy(&last_rreq_originator, &rm->src_addr);
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last_rreq_id = rm->rreq_id;
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fwc_add(&rm->orig_addr, &rm->rreq_id);
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rm->hop_count++;
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uip_send((char *)rm, sizeof(struct uaodv_msg_rreq));
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} else {
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print_debug("Not forwarding rreq last_rreq_originator %d.%d.%d.%d src_addr %d.%d.%d.%d, last_rreq_id %ld rreq_id %ld\n",
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uip_ipaddr_to_quad(&last_rreq_originator),
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uip_ipaddr_to_quad(&rm->src_addr),
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last_rreq_id, rm->rreq_id);
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uip_send(rm, sizeof(struct uaodv_msg_rreq));
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}
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}
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/*---------------------------------------------------------------------------*/
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@ -236,31 +262,27 @@ handle_incoming_rrep(void)
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struct uaodv_msg_rrep *rm = (struct uaodv_msg_rrep *)uip_appdata;
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struct uaodv_rt_entry *rt;
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/* Check if we have another route to this destination. If so, we'll
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use the new one if the hop count is lower, and if the sequence
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number say we should. */
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rt = uaodv_rt_lookup(&rm->dest_addr);
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print_debug("RREP received\n rt=%p", rt);
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print_debug("RREP received rt=%p\n", rt);
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if(rt == NULL ||
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(rt->hop_count > rm->hop_count /* && seqno < seqno */)) {
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/* Insert originator into routing table. */
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print_debug("Inserting3 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d, hop_count %d.\n",
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/* New forward route? */
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if(rt == NULL || (SCMP32(ntohl(rm->dest_seqno), rt->seqno) > 0)) {
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print_debug("Inserting3 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d, hop_count %u seq %lu.\n",
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uip_ipaddr_to_quad(&rm->dest_addr),
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uip_ipaddr_to_quad(uip_udp_sender()),
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rm->hop_count);
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uaodv_rt_add(&rm->dest_addr, uip_udp_sender(), rm->hop_count, 0);
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rm->hop_count,
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ntohl(rm->dest_seqno));
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rt = uaodv_rt_add(&rm->dest_addr, uip_udp_sender(),
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rm->hop_count, ntohl(rm->dest_seqno));
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#ifdef CC2420_RADIO
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/* This link is ok since he is unicasting back to us! */
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cc2420_recv_ok(uip_udp_sender());
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PRINTF("RREP recv ok from %d.%d.%d.%d %d %d \n",
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print_debug("RREP recv ok from %d.%d.%d.%d %d %d \n",
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uip_ipaddr_to_quad(uip_udp_sender()),
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cc2420_last_rssi,
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cc2420_last_correlation);
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#endif
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} else {
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print_debug("Not inserting %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d, hop_count %d.\n",
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uip_ipaddr_to_quad(&rm->dest_addr),
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@ -268,17 +290,12 @@ handle_incoming_rrep(void)
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rm->hop_count);
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}
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if(uip_ipaddr_cmp(&rm->src_addr, &uip_hostaddr)) {
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/* Forward RREP towards originator? */
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if(uip_ipaddr_cmp(&rm->orig_addr, &uip_hostaddr)) {
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print_debug("------- COMPLETE ROUTE FOUND\n");
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} else {
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#if 0
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print_debug("Sending back to originator\n");
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print_debug("Route lookup for %d.%d.%d.%d\n",
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uip_ipaddr_to_quad(&rm->src_addr));
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#endif
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rt = uaodv_rt_lookup(&rm->src_addr);
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rt = uaodv_rt_lookup(&rm->orig_addr);
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if(rt == NULL) {
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print_debug("RREP received, but no route back to originator... :-( \n");
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@ -287,12 +304,13 @@ handle_incoming_rrep(void)
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rm->hop_count++;
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print_debug("Sending RREP to %d.%d.%d.%d\n",
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uip_ipaddr_to_quad(&rt->nexthop));
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print_debug("Fwd RREP to %d.%d.%d.%d\n", uip_ipaddr_to_quad(&rt->nexthop));
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sendto(&rt->nexthop, (char *)rm, sizeof(struct uaodv_msg_rrep));
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/* print_debug("RREP forwarded\n");*/
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#ifdef CC2420_RADIO
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if(cc2420_check_remote(rt->nexthop.u16[1]) == REMOTE_MAYBE)
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cc2420_recv_ok(&rt->nexthop);
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#endif
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sendto(&rt->nexthop, rm, sizeof(struct uaodv_msg_rrep));
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}
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}
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/*---------------------------------------------------------------------------*/
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@ -305,13 +323,16 @@ handle_incoming_rerr(void)
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print_debug("RERR received from %d.%d.%d.%d route to %d.%d.%d.%d seq=%ld\n",
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uip_ipaddr_to_quad(uip_udp_sender()),
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uip_ipaddr_to_quad(&rm->unreach[0].addr), rm->unreach[0].seqno);
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uip_ipaddr_to_quad(&rm->unreach[0].addr),
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ntohl(rm->unreach[0].seqno));
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rt = uaodv_rt_lookup(&rm->unreach[0].addr);
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if(rt != NULL && uip_ipaddr_cmp(&rt->nexthop, uip_udp_sender())) {
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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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uaodv_rt_remove(rt);
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print_debug("RERR rebroadcast\n");
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sendto(&uip_broadcast_addr, (char *)rm, sizeof(struct uaodv_msg_rerr));
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sendto(&uip_broadcast_addr, rm, sizeof(struct uaodv_msg_rerr));
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}
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}
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#endif
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@ -348,13 +369,13 @@ static enum {
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#ifdef UAODV_BAD_ROUTE
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static uip_ipaddr_t bad_nexthop;
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u32_t bad_seqno;
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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)
|
||||
{
|
||||
uip_ipaddr_copy(&bad_nexthop, &rt->nexthop);
|
||||
bad_seqno = rt->seqno;
|
||||
bad_seqno = htonl(rt->seqno);
|
||||
command = COMMAND_SEND_RERR;
|
||||
process_post(&uaodv_process, PROCESS_EVENT_MSG, NULL);
|
||||
}
|
||||
|
|
@ -369,6 +390,7 @@ uaodv_request_route_to(uip_ipaddr_t *host)
|
|||
struct uaodv_rt_entry *route = uaodv_rt_lookup(host);
|
||||
|
||||
if(route != NULL) {
|
||||
uaodv_rt_lru(route);
|
||||
return route;
|
||||
}
|
||||
|
||||
|
|
@ -416,7 +438,7 @@ PROCESS_THREAD(uaodv_process, ev, data)
|
|||
send_rreq(&rreq_addr);
|
||||
#ifdef UAODV_BAD_ROUTE
|
||||
else if (command == COMMAND_SEND_RERR)
|
||||
send_rerr(&bad_nexthop, bad_seqno);
|
||||
send_rerr(&bad_nexthop, &bad_seqno);
|
||||
#endif
|
||||
command = COMMAND_NONE;
|
||||
continue;
|
||||
|
|
|
|||
Loading…
Reference in a new issue