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contiki/core/net/uaodv.c
bg- fb94d50410 Change typedef of uip_ipaddr_t from a vector type to a union. 
typedef union uip_ip4addr_t {
  u16_t u16[2];
  u8_t  u8[4];
} uip_ip4addr_t;

typedef uip_ip4addr_t uip_ipaddr_t;

This implies that one must consistently pass pointers to
uip_ipaddr_t:s and not mix and match pointers with
uip_ipaddr_t:s as was done earlier.
2006-08-09 16:13:39 +00:00

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: uaodv.c,v 1.2 2006/08/09 16:13:39 bg- Exp $
*/
/**
* \file
* Micro implementation of the AODV ad hoc routing protocol
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <stdio.h>
#include <stdarg.h>
#include "contiki.h"
#include "net/uaodv-def.h"
#include "net/uaodv-rt.h"
#ifdef TMOTE_SKY
#include "dev/cc2420.h"
#endif
#define MY_ROUTE_TIMEOUT 0
PROCESS(uaodv_process, "uAODV");
static struct uip_udp_conn *aodvconn, *unicastconn;
static u32_t rreq_id, rreq_seqno;
static uip_ipaddr_t last_rreq_originator;
static u32_t last_rreq_id;
#define ip2quad(p) uip_ipaddr1(p),uip_ipaddr2(p),uip_ipaddr3(p),uip_ipaddr4(p)
#if 1
#define print_debug(...) do{}while(0)
#else
static void
print_debug(const char *fmt, ...)
{
#if 1
va_list ap;
va_start(ap, fmt);
printf("%d.%d.%d.%d: ", ip2quad(&uip_hostaddr));
vprintf(fmt, ap);
va_end(ap);
#endif
return;
}
#endif
#define uip_udp_sender() (&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->srcipaddr)
/*---------------------------------------------------------------------------*/
static void
sendto(const uip_ipaddr_t *dest, char *buf, int len)
{
/* XXX: this is a HACK! We're updating the uIP UDP connection
"unicastconn" so that the destination address is the next-hop,
and we're patching the "uip_udp_conn" variable so that it points
the this connection instead. THIS IS NOT A NICE WAY TO DO THIS,
but it is currently nicer than the alternative (requesting a new
poll, and remembering the state, etc.). */
uip_ipaddr_copy(&unicastconn->ripaddr, dest);
uip_udp_conn = unicastconn;
uip_send(buf, len);
}
/*---------------------------------------------------------------------------*/
static void
send_rreq(uip_ipaddr_t *addr)
{
struct uaodv_msg_rreq *rm = (struct uaodv_msg_rreq *)uip_appdata;
rm->type = UAODV_RREQ_TYPE;
rm->flags = UAODV_RREQ_UNKSEQNO;
rm->reserved = 0;
rm->hop_count = 0;
rm->rreq_id = rreq_id;
uip_ipaddr_copy(&rm->dest_addr, addr);
rm->dest_seqno = 0;
uip_gethostaddr(&rm->src_addr);
rm->src_seqno = rreq_seqno;
uip_send((char *)rm, sizeof(struct uaodv_msg_rreq));
++rreq_seqno;
++rreq_id;
uip_ipaddr_copy(&last_rreq_originator, &rm->src_addr);
last_rreq_id = rm->rreq_id;
}
/*---------------------------------------------------------------------------*/
static void
send_rrep(uip_ipaddr_t *dst, uip_ipaddr_t *nexthop, uip_ipaddr_t *src, u32_t seqno)
{
struct uaodv_msg_rrep *rm = (struct uaodv_msg_rrep *)uip_appdata;
rm->type = UAODV_RREP_TYPE;
rm->flags = 0;
rm->reserved = 0;
rm->hop_count = 0;
uip_ipaddr_copy(&rm->src_addr, src);
rm->dest_seqno = seqno;
uip_ipaddr_copy(&rm->dest_addr, dst);
rm->lifetime = MY_ROUTE_TIMEOUT;
sendto(nexthop, (char *)rm, sizeof(struct uaodv_msg_rrep));
print_debug("Sending RREP to %d.%d.%d.%d\n",
uip_ipaddr1(nexthop),
uip_ipaddr2(nexthop),
uip_ipaddr3(nexthop),
uip_ipaddr4(nexthop));
}
/*---------------------------------------------------------------------------*/
#ifdef UAODV_BAD_ROUTE
static void
send_rerr(uip_ipaddr_t *addr, u32_t seqno)
{
struct uaodv_msg_rerr *rm = (struct uaodv_msg_rerr *)uip_appdata;
rm->type = UAODV_RERR_TYPE;
rm->flags = 0;
rm->reserved = 0;
rm->dest_count = 1;
uip_ipaddr_copy(&rm->unreach[0].addr, addr);
rm->unreach[0].seqno = seqno;
sendto(&uip_broadcast_addr, (char *)rm, sizeof(struct uaodv_msg_rerr));
print_debug("Broadcasting initial RERR for %d.%d.%d.%d\n", ip2quad(addr));
}
#endif
/*---------------------------------------------------------------------------*/
static void
handle_incoming_rreq(void)
{
struct uaodv_msg_rreq *rm = (struct uaodv_msg_rreq *)uip_appdata;
uip_ipaddr_t dest_addr, src_addr;
struct uaodv_rt_entry *rt;
#ifdef TMOTE_SKY
if(cc2420_last_rssi <= -38 || cc2420_last_correlation < 100) {
printf("RREQ drop from %d.%d.%d.%d %d %d \n",
uip_ipaddr1(uip_udp_sender()),
uip_ipaddr2(uip_udp_sender()),
uip_ipaddr3(uip_udp_sender()),
uip_ipaddr4(uip_udp_sender()),
cc2420_last_rssi,
cc2420_last_correlation);
return;
}
#endif
/* Check if it is for our address. */
if(uip_ipaddr_cmp(&rm->dest_addr, &uip_hostaddr)) {
print_debug("RREQ for our address!\n");
rt = uaodv_rt_lookup(&rm->src_addr);
if(rt == NULL || rm->hop_count <= rt->hop_count) {
/* Insert originator into routing table. */
print_debug("Inserting1 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d., hop_count %d\n",
uip_ipaddr1(&rm->src_addr),
uip_ipaddr2(&rm->src_addr),
uip_ipaddr3(&rm->src_addr),
uip_ipaddr4(&rm->src_addr),
uip_ipaddr1(uip_udp_sender()),
uip_ipaddr2(uip_udp_sender()),
uip_ipaddr3(uip_udp_sender()),
uip_ipaddr4(uip_udp_sender()),
rm->hop_count);
uaodv_rt_add(&rm->src_addr, uip_udp_sender(), rm->hop_count, 0);
}
/* Send an RREP back to the source of the RREQ. */
uip_ipaddr_copy( &dest_addr, &rm->dest_addr );
uip_ipaddr_copy( &src_addr, &rm->src_addr );
send_rrep(&dest_addr, uip_udp_sender(), &src_addr, rm->src_seqno);
} else if(!uip_ipaddr_cmp(&last_rreq_originator, &rm->src_addr) ||
last_rreq_id != rm->rreq_id) {
print_debug("RREQ for %d.%d.%d.%d!\n",
uip_ipaddr1(&rm->dest_addr),
uip_ipaddr2(&rm->dest_addr),
uip_ipaddr3(&rm->dest_addr),
uip_ipaddr4(&rm->dest_addr));
rt = uaodv_rt_lookup(&rm->src_addr);
if(rt == NULL || rm->hop_count <= rt->hop_count) {
/* Insert originator into routing table. */
print_debug("Inserting2 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d., hop_count %d\n",
uip_ipaddr1(&rm->src_addr),
uip_ipaddr2(&rm->src_addr),
uip_ipaddr3(&rm->src_addr),
uip_ipaddr4(&rm->src_addr),
uip_ipaddr1(uip_udp_sender()),
uip_ipaddr2(uip_udp_sender()),
uip_ipaddr3(uip_udp_sender()),
uip_ipaddr4(uip_udp_sender()),
rm->hop_count);
uaodv_rt_add(&rm->src_addr, uip_udp_sender(), rm->hop_count, 0);
}
/* Forward RREQ. XXX to be compliant, we should check the TTL
of the incoming packet and forward only if TTL > 1. We
should also set the TTL in our outgoing IP header too, but
there currently is no way of doing this in Contiki so we
don't do it at the moment. */
print_debug("Forwarding RREQ to %d.%d.%d.%d ttl=%d\n",
uip_ipaddr1(&rm->src_addr),
uip_ipaddr2(&rm->src_addr),
uip_ipaddr3(&rm->src_addr),
uip_ipaddr4(&rm->src_addr),
uip_udp_conn->ttl);
uip_ipaddr_copy(&last_rreq_originator, &rm->src_addr);
last_rreq_id = rm->rreq_id;
rm->hop_count++;
uip_send((char *)rm, sizeof(struct uaodv_msg_rreq));
} else {
print_debug("Not forwarding rreq last_rreq_originator %d.%d.%d.%d src_addr %d.%d.%d.%d, last_rreq_id %d rreq_id %d\n",
uip_ipaddr1(&last_rreq_originator),
uip_ipaddr2(&last_rreq_originator),
uip_ipaddr3(&last_rreq_originator),
uip_ipaddr4(&last_rreq_originator),
uip_ipaddr1(&rm->src_addr),
uip_ipaddr2(&rm->src_addr),
uip_ipaddr3(&rm->src_addr),
uip_ipaddr4(&rm->src_addr),
last_rreq_id, rm->rreq_id);
}
}
/*---------------------------------------------------------------------------*/
static void
handle_incoming_rrep(void)
{
struct uaodv_msg_rrep *rm = (struct uaodv_msg_rrep *)uip_appdata;
struct uaodv_rt_entry *rt;
print_debug("RREP received\n");
/* Check if we have another route to this destination. If so, we'll
use the new one if the hop count is lower, and if the sequence
number say we should. */
rt = uaodv_rt_lookup(&rm->dest_addr);
if(rt == NULL ||
(rt->hop_count > rm->hop_count /* && seqno < seqno */)) {
/* Insert originator into routing table. */
print_debug("Inserting3 %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d, hop_count %d.\n",
uip_ipaddr1(&rm->dest_addr),
uip_ipaddr2(&rm->dest_addr),
uip_ipaddr3(&rm->dest_addr),
uip_ipaddr4(&rm->dest_addr),
uip_ipaddr1(uip_udp_sender()),
uip_ipaddr2(uip_udp_sender()),
uip_ipaddr3(uip_udp_sender()),
uip_ipaddr4(uip_udp_sender()), rm->hop_count
);
uaodv_rt_add(&rm->dest_addr, uip_udp_sender(), rm->hop_count, 0);
#ifdef TMOTE_SKY
/* This link is ok since he is unicasting back to us! */
cc2420_recv_ok(uip_udp_sender());
printf("RREP recv ok from %d.%d.%d.%d %d %d \n",
uip_ipaddr1(uip_udp_sender()),
uip_ipaddr2(uip_udp_sender()),
uip_ipaddr3(uip_udp_sender()),
uip_ipaddr4(uip_udp_sender()),
cc2420_last_rssi,
cc2420_last_correlation);
#endif
} else {
print_debug("Not inserting %d.%d.%d.%d into routing table, next hop %d.%d.%d.%d, hop_count %d.\n",
uip_ipaddr1(&rm->dest_addr),
uip_ipaddr2(&rm->dest_addr),
uip_ipaddr3(&rm->dest_addr),
uip_ipaddr4(&rm->dest_addr),
uip_ipaddr1(uip_udp_sender()),
uip_ipaddr2(uip_udp_sender()),
uip_ipaddr3(uip_udp_sender()),
uip_ipaddr4(uip_udp_sender()), rm->hop_count
);
}
if(uip_ipaddr_cmp(&rm->src_addr, &uip_hostaddr)) {
print_debug("------- COMPLETE ROUTE FOUND\n");
} else {
/* print_debug("Sending back to originator\n");
print_debug("Route lookup for %d.%d.%d.%d\n",
uip_ipaddr1(&rm->src_addr),
uip_ipaddr2(&rm->src_addr),
uip_ipaddr3(&rm->src_addr),
uip_ipaddr4(&rm->src_addr));*/
rt = uaodv_rt_lookup(&rm->src_addr);
if(rt == NULL) {
print_debug("RREP received, but no route back to originator... :-( \n");
return;
}
rm->hop_count++;
print_debug("Sending RREP to %d.%d.%d.%d\n",
uip_ipaddr1(&rt->nexthop),
uip_ipaddr2(&rt->nexthop),
uip_ipaddr3(&rt->nexthop),
uip_ipaddr4(&rt->nexthop));
sendto(&rt->nexthop, (char *)rm, sizeof(struct uaodv_msg_rrep));
/* print_debug("RREP forwarded\n");*/
}
}
/*---------------------------------------------------------------------------*/
#ifdef UAODV_BAD_ROUTE
static void
handle_incoming_rerr(void)
{
struct uaodv_msg_rerr *rm = (struct uaodv_msg_rerr *)uip_appdata;
struct uaodv_rt_entry *rt;
print_debug("RERR received from %d.%d.%d.%d route to %d.%d.%d.%d seq=%d\n",
ip2quad(uip_udp_sender()),
ip2quad(&rm->unreach[0].addr), rm->unreach[0].seqno);
rt = uaodv_rt_lookup(&rm->unreach[0].addr);
if(rt != NULL && uip_ipaddr_cmp(&rt->nexthop, uip_udp_sender())) {
uaodv_rt_remove(rt);
print_debug("RERR rebroadcast\n");
sendto(&uip_broadcast_addr, (char *)rm, sizeof(struct uaodv_msg_rerr));
}
}
#endif
/*---------------------------------------------------------------------------*/
static void
handle_incoming_packet(void)
{
struct uaodv_msg *m = (struct uaodv_msg *)uip_appdata;
/* print_debug("New UDP data, AODV packet type %d\n", m->type);*/
switch(m->type) {
case UAODV_RREQ_TYPE:
handle_incoming_rreq();
break;
case UAODV_RREP_TYPE:
handle_incoming_rrep();
break;
#ifdef UAODV_BAD_ROUTE
case UAODV_RERR_TYPE:
handle_incoming_rerr();
break;
#endif
}
}
/*---------------------------------------------------------------------------*/
static enum {
COMMAND_NONE,
COMMAND_SEND_RREQ,
COMMAND_SEND_RERR,
} command;
#ifdef UAODV_BAD_ROUTE
static uip_ipaddr_t bad_nexthop;
u32_t bad_seqno;
void
uaodv_bad_route(struct uaodv_rt_entry *rt)
{
uip_ipaddr_copy(&bad_nexthop, &rt->nexthop);
bad_seqno = rt->seqno;
command = COMMAND_SEND_RERR;
process_post(&uaodv_process, PROCESS_EVENT_MSG, NULL);
}
#endif
static uip_ipaddr_t rreq_addr;
static struct timer next_time;
struct uaodv_rt_entry *
uaodv_request_route_to(uip_ipaddr_t *host)
{
struct uaodv_rt_entry *route = uaodv_rt_lookup(host);
if(route != NULL) {
return route;
}
/*
* Broadcast protocols must be rate-limited!
*/
if(!timer_expired(&next_time)) {
return NULL;
}
if(command != COMMAND_NONE) {
return NULL;
}
uip_ipaddr_copy(&rreq_addr, host);
command = COMMAND_SEND_RREQ;
process_post(&uaodv_process, PROCESS_EVENT_MSG, NULL);
timer_set(&next_time, CLOCK_SECOND/4); /* Max 10/s per RFC3561. */
return NULL;
}
PROCESS_THREAD(uaodv_process, ev, data)
{
PROCESS_EXITHANDLER(goto exit);
PROCESS_BEGIN();
printf("uaodv_process starting\n");
aodvconn = udp_broadcast_new(HTONS(UAODV_UDPPORT), NULL);
aodvconn->ttl = 1;
unicastconn = udp_broadcast_new(HTONS(UAODV_UDPPORT), NULL);
unicastconn->ttl = 1;
while(1) {
PROCESS_WAIT_EVENT();
if(ev == tcpip_event) {
if(uip_newdata()) {
handle_incoming_packet();
continue;
}
if(uip_poll()) {
if(command == COMMAND_SEND_RREQ)
send_rreq(&rreq_addr);
#ifdef UAODV_BAD_ROUTE
else if (command == COMMAND_SEND_RERR)
send_rerr(&bad_nexthop, bad_seqno);
#endif
command = COMMAND_NONE;
continue;
}
}
if(ev == PROCESS_EVENT_MSG) {
tcpip_poll_udp(aodvconn);
}
}
exit:
command = COMMAND_NONE;
uaodv_rt_flush_all();
uip_udp_remove(aodvconn);
aodvconn = NULL;
uip_udp_remove(unicastconn);
unicastconn = NULL;
printf("uaodv_process exiting\n");
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
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