/*
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* Copyright (c) 2005, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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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*/
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/**
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* \file
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* Micro implementation of the AODV ad hoc routing protocol
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include "contiki.h"
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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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#define RSSI_THRESHOLD -39 /* accept -39 ... xx */
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#endif
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/* This implementation never expires routes!!! */
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#define MY_ROUTE_TIMEOUT 0x7fffffff /* Should be 0xffffffff! */
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#define MY_NET_DIAMETER 20
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PROCESS(uaodv_process, "uAODV");
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static struct uip_udp_conn *bcastconn, *unicastconn;
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/* Compare sequence numbers as per RFC 3561. */
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#define SCMP32(a, b) ((int32_t)((a) - (b)))
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static CC_INLINE uint32_t
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last_known_seqno(uip_ipaddr_t *host)
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{
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struct uaodv_rt_entry *route = uaodv_rt_lookup_any(host);
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if(route != NULL)
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return uip_htonl(route->hseqno);
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return 0;
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}
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static uint32_t rreq_id, my_hseqno; /* In host byte order! */
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#define NFWCACHE 16
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static struct {
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uip_ipaddr_t orig;
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uint32_t id;
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} fwcache[NFWCACHE];
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static CC_INLINE int
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fwc_lookup(const uip_ipaddr_t *orig, const uint32_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 CC_INLINE void
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fwc_add(const uip_ipaddr_t *orig, const uint32_t *id)
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{
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unsigned n = (orig->u8[2] + orig->u8[3]) % NFWCACHE;
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fwcache[n].id = *id;
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uip_ipaddr_copy(&fwcache[n].orig, orig);
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}
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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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#define PRINTF(...) printf(__VA_ARGS__)
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#ifdef __GNUC__
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static void
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print_debug(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
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#endif /* __GNUC__ */
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static void
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print_debug(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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printf("%d.%d.%d.%d: ", uip_ipaddr_to_quad(&uip_hostaddr));
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vprintf(fmt, ap);
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va_end(ap);
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return;
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}
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#endif
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#define BUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define uip_udp_sender() (&BUF->srcipaddr)
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/*---------------------------------------------------------------------------*/
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static void
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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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and we're patching the "uip_udp_conn" variable so that it points
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the this connection instead. THIS IS NOT A NICE WAY TO DO THIS,
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but it is currently nicer than the alternative (requesting a new
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poll, and remembering the state, etc.). */
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uip_ipaddr_copy(&unicastconn->ripaddr, dest);
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uip_udp_conn = unicastconn;
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uip_udp_packet_send(unicastconn, buf, len);
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}
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/*---------------------------------------------------------------------------*/
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#ifdef AODV_BAD_HOP_EXTENSION
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static unsigned
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add_rreq_extensions(void *_p)
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{
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struct uaodv_bad_hop_ext *p = _p;
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uip_ipaddr_t *a = p->addrs;
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unsigned i, n;
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#define SCALE_RETRANS_THRESHOLD (3*4)
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cc2420_check_remote(0xffff); /* Age table. */
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n = 0;
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for (i = 0; i < NNEIGBOURS; i++) {
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if (neigbours[i].nretrans >= SCALE_RETRANS_THRESHOLD
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&& neigbours[i].mac != 0xffff) {
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a->u16[0] = uip_hostaddr.u16[0];
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a->u16[1] = neigbours[i].mac;
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n++;
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if(n == 15)
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break; /* Avoid buffer overrun */
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print_debug("BAD HOP %d.%d.%d.%d\t%d\n",
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uip_ipaddr_to_quad(a), neigbours[i].nretrans);
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}
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}
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if(n == 0)
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return 0;
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p->type = RREQ_BAD_HOP_EXT;
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p->length = 2 + 4*n; /* Two unused bytes + addresses */
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return 2 + p->length; /* Type + len + extension data */
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}
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#else
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#define add_rreq_extensions(p) 0 /* Don't add anything */
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#endif
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static void
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send_rreq(uip_ipaddr_t *addr)
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{
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struct uaodv_msg_rreq *rm = (struct uaodv_msg_rreq *)uip_appdata;
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int len;
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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 = last_known_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 = uip_htonl(rreq_id++);
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uip_ipaddr_copy(&rm->dest_addr, addr);
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uip_gethostaddr(&rm->orig_addr);
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my_hseqno++; /* Always */
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rm->orig_seqno = uip_htonl(my_hseqno);
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bcastconn->ttl = MY_NET_DIAMETER;
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len = sizeof(struct uaodv_msg_rreq);
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len += add_rreq_extensions(rm + 1);
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uip_udp_packet_send(bcastconn, rm, len);
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_rrep(uip_ipaddr_t *dest, uip_ipaddr_t *nexthop, uip_ipaddr_t *orig,
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uint32_t *seqno, unsigned hop_count)
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{
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struct uaodv_msg_rrep *rm = (struct uaodv_msg_rrep *)uip_appdata;
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print_debug("send RREP orig=%d.%d.%d.%d hops=%d\n",
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uip_ipaddr_to_quad(orig), hop_count);
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rm->type = UAODV_RREP_TYPE;
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rm->flags = 0;
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rm->prefix_sz = 0; /* I.e a /32 route. */
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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 = *seqno;
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uip_ipaddr_copy(&rm->dest_addr, dest);
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rm->lifetime = UIP_HTONL(MY_ROUTE_TIMEOUT);
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sendto(nexthop, rm, sizeof(struct uaodv_msg_rrep));
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_rerr(uip_ipaddr_t *addr, uint32_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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print_debug("send RERR for %d.%d.%d.%d\n", uip_ipaddr_to_quad(addr));
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rm->type = UAODV_RERR_TYPE;
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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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if(*seqno == 0)
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rm->flags = UAODV_RERR_UNKNOWN;
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else
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rm->flags = 0;
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uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rerr));
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}
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/*---------------------------------------------------------------------------*/
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static void
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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, orig_addr;
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struct uaodv_rt_entry *rt, *fw = NULL;
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print_debug("RREQ %d.%d.%d.%d -> %d.%d.%d.%d ttl=%u"
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" orig=%d.%d.%d.%d seq=%lu hops=%u dest=%d.%d.%d.%d seq=%lu\n",
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uip_ipaddr_to_quad(&BUF->srcipaddr),
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uip_ipaddr_to_quad(&BUF->destipaddr),
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BUF->ttl,
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uip_ipaddr_to_quad(&rm->orig_addr), uip_ntohl(rm->orig_seqno),
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rm->hop_count,
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uip_ipaddr_to_quad(&rm->dest_addr), uip_ntohl(rm->dest_seqno));
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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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#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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} else if (ret == REMOTE_NO) {
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/* Is neigbour, accept it. */
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} else if(cc2420_last_rssi < RSSI_THRESHOLD) {
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print_debug("RREQ drop %d %d\n", cc2420_last_rssi,
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cc2420_last_correlation);
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return;
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}
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}
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#endif
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#ifdef AODV_BAD_HOP_EXTENSION
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if(uip_len > (sizeof(*rm) + 2)) {
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struct uaodv_bad_hop_ext *ext = (void *)(uip_appdata + sizeof(*rm));
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uint8_t *end = uip_appdata + uip_len;
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for(;
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(uint8_t *)ext < end;
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ext = (void *)((uint8_t *)ext + ext->length + 2)) {
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uint8_t *eend = (uint8_t *)ext + ext->length;
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if(eend > end)
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eend = end;
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if(ext->type == RREQ_BAD_HOP_EXT) {
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uip_ipaddr_t *a;
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for(a = ext->addrs; (uint8_t *)a < eend; a++) {
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if(uip_ipaddr_cmp(a, &uip_hostaddr)) {
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print_debug("BAD_HOP drop\n");
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return;
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}
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}
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}
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}
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}
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#endif /* AODV_BAD_HOP_EXTENSION */
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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(uip_ntohl(rm->orig_seqno), rt->hseqno) > 0) /* New route. */
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|| (SCMP32(uip_ntohl(rm->orig_seqno), rt->hseqno) == 0
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&& rm->hop_count < rt->hop_count)) { /* Better route. */
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print_debug("Inserting1\n");
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rt = uaodv_rt_add(&rm->orig_addr, uip_udp_sender(),
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rm->hop_count, &rm->orig_seqno);
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}
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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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|| rm->flags & UAODV_RREQ_DESTONLY) {
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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(fw->hseqno, uip_ntohl(rm->dest_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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uint32_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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net_seqno = uip_htonl(fw->hseqno);
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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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uint32_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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my_hseqno++;
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if(!(rm->flags & UAODV_RREQ_UNKSEQNO)
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&& SCMP32(my_hseqno, uip_ntohl(rm->dest_seqno)) < 0) {
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print_debug("New my_hseqno %lu\n", my_hseqno); /* We have rebooted. */
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my_hseqno = uip_ntohl(rm->dest_seqno) + 1;
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}
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net_seqno = uip_htonl(my_hseqno);
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send_rrep(&dest_addr, &rt->nexthop, &orig_addr, &net_seqno, 0);
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} else if(BUF->ttl > 1) {
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int len;
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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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bcastconn->ttl = BUF->ttl - 1;
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len = sizeof(struct uaodv_msg_rreq);
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len += add_rreq_extensions(rm + 1);
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uip_udp_packet_send(bcastconn, rm, len);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_incoming_rrep(void)
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{
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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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/* Useless HELLO message? */
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if(uip_ipaddr_cmp(&BUF->destipaddr, &uip_broadcast_addr)) {
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#ifdef AODV_RESPOND_TO_HELLOS
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uint32_t net_seqno;
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#ifdef CC2420_RADIO
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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("HELLO drop is remote\n");
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return;
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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 < RSSI_THRESHOLD) {
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print_debug("HELLO drop %d %d\n", cc2420_last_rssi, cc2420_last_correlation);
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return;
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}
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#endif
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/* Sometimes it helps to send a non-requested RREP in response! */
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net_seqno = uip_htonl(my_hseqno);
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send_rrep(&uip_hostaddr, &BUF->srcipaddr, &BUF->srcipaddr, &net_seqno, 0);
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#endif
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return;
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}
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print_debug("RREP %d.%d.%d.%d -> %d.%d.%d.%d"
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" dest=%d.%d.%d.%d seq=%lu hops=%u orig=%d.%d.%d.%d\n",
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uip_ipaddr_to_quad(&BUF->srcipaddr),
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uip_ipaddr_to_quad(&BUF->destipaddr),
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uip_ipaddr_to_quad(&rm->dest_addr), uip_ntohl(rm->dest_seqno),
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rm->hop_count,
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uip_ipaddr_to_quad(&rm->orig_addr));
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rt = uaodv_rt_lookup(&rm->dest_addr);
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/* New forward route? */
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if(rt == NULL || (SCMP32(uip_ntohl(rm->dest_seqno), rt->hseqno) > 0)) {
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print_debug("Inserting3\n");
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rt = uaodv_rt_add(&rm->dest_addr, uip_udp_sender(),
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rm->hop_count, &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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print_debug("RREP recv ok %d %d\n",
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cc2420_last_rssi, cc2420_last_correlation);
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#endif
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} else {
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print_debug("Not inserting\n");
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}
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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("ROUTE FOUND\n");
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if(rm->flags & UAODV_RREP_ACK) {
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struct uaodv_msg_rrep_ack *ack = (void *)uip_appdata;
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ack->type = UAODV_RREP_ACK_TYPE;
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ack->reserved = 0;
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sendto(uip_udp_sender(), ack, sizeof(*ack));
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}
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} else {
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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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return;
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}
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if(rm->flags & UAODV_RREP_ACK) {
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print_debug("RREP with ACK request (ignored)!\n");
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/* Don't want any RREP-ACKs in return! */
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rm->flags &= ~UAODV_RREP_ACK;
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}
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rm->hop_count++;
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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, rm, sizeof(struct uaodv_msg_rrep));
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_incoming_rerr(void)
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{
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struct uaodv_msg_rerr *rm = (struct uaodv_msg_rerr *)uip_appdata;
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struct uaodv_rt_entry *rt;
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print_debug("RERR %d.%d.%d.%d -> %d.%d.%d.%d"
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" unreach=%d.%d.%d.%d seq=%lu\n",
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uip_ipaddr_to_quad(&BUF->srcipaddr),
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uip_ipaddr_to_quad(&BUF->destipaddr),
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uip_ipaddr_to_quad((uip_ipaddr_t *)&rm->unreach[0]),
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uip_ntohl(rm->unreach[0].seqno));
|
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if(uip_ipaddr_cmp(&rm->unreach[0].addr, &uip_hostaddr))
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return;
|
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rt = uaodv_rt_lookup_any(&rm->unreach[0].addr);
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if(rt != NULL && uip_ipaddr_cmp(&rt->nexthop, uip_udp_sender())) {
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if((rm->flags & UAODV_RERR_UNKNOWN) || rm->unreach[0].seqno == 0
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|| SCMP32(rt->hseqno, uip_ntohl(rm->unreach[0].seqno)) <= 0) {
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rt->is_bad = 1;
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if(rm->flags & UAODV_RERR_UNKNOWN) {
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rm->flags &= ~UAODV_RERR_UNKNOWN;
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rm->unreach[0].seqno = uip_htonl(rt->hseqno);
|
}
|
print_debug("RERR rebroadcast\n");
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uip_udp_packet_send(bcastconn, rm, sizeof(struct uaodv_msg_rerr));
|
}
|
}
|
}
|
/*---------------------------------------------------------------------------*/
|
static void
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handle_incoming_packet(void)
|
{
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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;
|
|
case UAODV_RERR_TYPE:
|
handle_incoming_rerr();
|
break;
|
}
|
|
}
|
/*---------------------------------------------------------------------------*/
|
static enum {
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COMMAND_NONE,
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COMMAND_SEND_RREQ,
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COMMAND_SEND_RERR,
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} command;
|
|
static uip_ipaddr_t bad_dest;
|
static uint32_t bad_seqno; /* In network byte order! */
|
|
void
|
uaodv_bad_dest(uip_ipaddr_t *dest)
|
{
|
struct uaodv_rt_entry *rt = uaodv_rt_lookup_any(dest);
|
|
if(rt == NULL)
|
bad_seqno = 0; /* Or flag this in RERR? */
|
else {
|
rt->is_bad = 1;
|
bad_seqno = uip_htonl(rt->hseqno);
|
}
|
|
uip_ipaddr_copy(&bad_dest, dest);
|
command = COMMAND_SEND_RERR;
|
process_post(&uaodv_process, PROCESS_EVENT_MSG, NULL);
|
}
|
|
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) {
|
uaodv_rt_lru(route);
|
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/8); /* Max 10/s per RFC3561. */
|
return NULL;
|
}
|
|
PROCESS_THREAD(uaodv_process, ev, data)
|
{
|
PROCESS_EXITHANDLER(goto exit);
|
|
PROCESS_BEGIN();
|
|
printf("uaodv_process starting %lu\n", (unsigned long) my_hseqno);
|
|
bcastconn = udp_broadcast_new(UIP_HTONS(UAODV_UDPPORT), NULL);
|
unicastconn = udp_broadcast_new(UIP_HTONS(UAODV_UDPPORT), NULL);
|
|
while(1) {
|
PROCESS_WAIT_EVENT();
|
|
if(ev == tcpip_event) {
|
if(uip_newdata()) {
|
handle_incoming_packet();
|
continue;
|
}
|
if(uip_poll()) {
|
if(command == COMMAND_SEND_RREQ) {
|
if(uaodv_rt_lookup(&rreq_addr) == NULL)
|
send_rreq(&rreq_addr);
|
} else if (command == COMMAND_SEND_RERR) {
|
send_rerr(&bad_dest, &bad_seqno);
|
}
|
command = COMMAND_NONE;
|
continue;
|
}
|
}
|
|
if(ev == PROCESS_EVENT_MSG) {
|
tcpip_poll_udp(bcastconn);
|
}
|
}
|
|
exit:
|
command = COMMAND_NONE;
|
uaodv_rt_flush_all();
|
uip_udp_remove(bcastconn);
|
bcastconn = NULL;
|
uip_udp_remove(unicastconn);
|
unicastconn = NULL;
|
printf("uaodv_process exiting\n");
|
PROCESS_END();
|
}
|
/*---------------------------------------------------------------------------*/
|
