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446 lines
14 KiB
C
446 lines
14 KiB
C
/*
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* Copyright (c) 2007, 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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* @(#)$Id: radio-uip-uaodv.c,v 1.2 2007/07/11 15:23:42 fros4943 Exp $
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*/
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#include "radio-uip-uaodv.h"
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#include "net/hc.h"
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#include "net/uip.h"
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#include "net/uaodv.h"
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#include "net/uaodv-rt.h"
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#include "net/uaodv-def.h"
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#include <string.h>
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#include <stdio.h>
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#define UNICAST_ACKED 1 /* Define to acknowledge unicast packets */
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#define BAD_REPLY_ON_NO_ROUTE 0 /* TODO */
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#define uip_udp_sender() (&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->srcipaddr)
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#define HEADER_ID_LENGTH strlen(uniqueFwdHeader)
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#define HEADER_NEXT_FWD HEADER_ID_LENGTH
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#define HEADER_LENGTH HEADER_NEXT_FWD + 4
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#if UNICAST_ACKED
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#include "lib/crc16.h"
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#include "list.h"
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enum {
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EVENT_SEND_ACK
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};
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struct bufferedPacket {
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struct bufferedPacket *next;
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u8_t data[UIP_BUFSIZE];
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int len;
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u8_t resends;
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u8_t acked;
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u16_t crc;
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struct etimer etimer;
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};
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LIST(bufferedPackets);
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MEMB(bufferedPacketsMEMB, struct bufferedPacket, 10);
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PROCESS(radio_uip_ack_process, "radio uIP uAODV ack process");
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#endif
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static const char* uniqueFwdHeader = "fWd:";
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#if UNICAST_ACKED
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static const char* uniqueAckHeader = "aCk";
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#define ACK_HEADER_LENGTH 3
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#define ACK_LENGTH ACK_HEADER_LENGTH + 2
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#endif
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static const struct radio_driver *radio;
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static struct uaodv_rt_entry *route;
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/*---------------------------------------------------------------------------*/
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#if UNICAST_ACKED
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int radio_uip_wait_for_ack(u8_t *buf, int len);
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int radio_uip_is_ack(u8_t *buf, int len);
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#endif
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int radio_uip_uaodv_add_header(u8_t *buf, int len, uip_ipaddr_t *addr);
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int radio_uip_uaodv_remove_header(u8_t *buf, int len);
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void radio_uip_uaodv_change_header(u8_t *buf, int len, uip_ipaddr_t *addr);
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int radio_uip_uaodv_header_exists(u8_t *buf, int len);
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int radio_uip_uaodv_is_broadcast(uip_ipaddr_t *addr);
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int radio_uip_uaodv_fwd_is_broadcast(u8_t *buf, int len);
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int radio_uip_uaodv_fwd_is_me(u8_t *buf, int len);
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int radio_uip_uaodv_dest_is_me(u8_t *buf, int len);
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int radio_uip_uaodv_dest_port(u8_t *buf, int len);
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/*---------------------------------------------------------------------------*/
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#if UNICAST_ACKED
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PROCESS_THREAD(radio_uip_ack_process, ev, data)
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{
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struct bufferedPacket *bufPacket;
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PROCESS_BEGIN();
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while(1) {
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PROCESS_YIELD();
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/* We should either send an ack, or resend a packet */
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if(ev == EVENT_SEND_ACK) {
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char ackPacket[ACK_LENGTH];
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/* Prepare and send ack */
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memcpy(ackPacket, uniqueAckHeader, ACK_HEADER_LENGTH);
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memcpy(&ackPacket[ACK_HEADER_LENGTH], &data, 2);
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radio->send(ackPacket, ACK_LENGTH);
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} else if(ev == PROCESS_EVENT_TIMER) {
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/* Locate which packet acknowledgement timed out */
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for(bufPacket = list_head(bufferedPackets);
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bufPacket != NULL;
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bufPacket = bufPacket->next) {
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if (etimer_expired(&bufPacket->etimer)) {
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if (bufPacket->acked) {
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/* This packet was already acknowledged! */
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list_remove(bufferedPackets, bufPacket);
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memb_free(&bufferedPacketsMEMB, bufPacket);
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} else if (bufPacket->resends < 3) {
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/* Resend packet a number of times */
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bufPacket->resends++;
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/* TODO Compress packets? */
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radio->send(bufPacket->data, bufPacket->len);
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etimer_restart(&bufPacket->etimer);
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} else {
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/* Too many resends, give up */
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list_remove(bufferedPackets, bufPacket);
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memb_free(&bufferedPacketsMEMB, bufPacket);
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/* TODO: Report non-delivered packet */
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}
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}
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}
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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#endif
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static void
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receiver(const struct radio_driver *d)
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{
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uip_len = d->read(&uip_buf[UIP_LLH_LEN], UIP_BUFSIZE - UIP_LLH_LEN);
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if (uip_len <= 0) {
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return;
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}
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#if UNICAST_ACKED
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/* Detect and parse acknowledgements */
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if (radio_uip_is_ack(&uip_buf[UIP_LLH_LEN], uip_len)) {
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radio_uip_handle_ack(&uip_buf[UIP_LLH_LEN], uip_len);
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return;
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}
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#endif
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#if UNICAST_ACKED
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/* uAODV RREP and RERR messages should be acked as soon as possible */
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if (radio_uip_uaodv_dest_is_me(&uip_buf[UIP_LLH_LEN], uip_len) &&
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radio_uip_uaodv_dest_port(&uip_buf[UIP_LLH_LEN], uip_len) == HTONS(UAODV_UDPPORT)) {
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struct uaodv_msg *m = (struct uaodv_msg *)&uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
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if (m->type == UAODV_RREP_TYPE || m->type == UAODV_RERR_TYPE) {
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u16_t crc;
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crc = radio_uip_calc_crc(&uip_buf[UIP_LLH_LEN], uip_len);
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process_post(&radio_uip_ack_process, EVENT_SEND_ACK, crc);
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}
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}
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#endif
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/* If no uAODV header, receive as usual (compatibility) */
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if (!radio_uip_uaodv_header_exists(&uip_buf[UIP_LLH_LEN], uip_len)) {
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uip_len = hc_inflate(&uip_buf[UIP_LLH_LEN], uip_len);
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tcpip_input();
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return;
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}
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/* If broadcast packet, strip header and receive without forwarding */
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if (radio_uip_uaodv_fwd_is_broadcast(&uip_buf[UIP_LLH_LEN], uip_len)) {
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/* Strip header and receive */
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uip_len = radio_uip_uaodv_remove_header(&uip_buf[UIP_LLH_LEN], uip_len);
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uip_len = hc_inflate(&uip_buf[UIP_LLH_LEN], uip_len);
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tcpip_input();
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return;
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}
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/* Drop packet unless we are the uAODV forwarder */
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if (!radio_uip_uaodv_fwd_is_me(&uip_buf[UIP_LLH_LEN], uip_len)) {
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return;
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}
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/* If we are final destination, strip header and receive */
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if (radio_uip_uaodv_dest_is_me(&uip_buf[UIP_LLH_LEN + HEADER_LENGTH], uip_len)) {
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#if UNICAST_ACKED
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{
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/* Unicast packets should be acked as soon as possible */
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u16_t crc;
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crc = radio_uip_calc_crc(&uip_buf[UIP_LLH_LEN], uip_len);
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process_post(&radio_uip_ack_process, EVENT_SEND_ACK, crc);
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}
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#endif
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uip_len = radio_uip_uaodv_remove_header(&uip_buf[UIP_LLH_LEN], uip_len);
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uip_len = hc_inflate(&uip_buf[UIP_LLH_LEN], uip_len);
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tcpip_input();
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return;
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}
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/* Find new uAODV forwarder and forward packet */
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/* TODO TTL? Hop-count? */
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/* TODO Assuming uAODV already knows a path */
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route = uaodv_rt_lookup((&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN + HEADER_LENGTH])->destipaddr));
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if (route != NULL) {
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#if UNICAST_ACKED
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{
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/* Ack last forwarder as soon as possible */
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u16_t crc;
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crc = radio_uip_calc_crc(&uip_buf[UIP_LLH_LEN], uip_len);
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process_post(&radio_uip_ack_process, EVENT_SEND_ACK, crc);
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}
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#endif
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radio_uip_uaodv_change_header(&uip_buf[UIP_LLH_LEN], uip_len, &route->nexthop);
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#if UNICAST_ACKED
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/* Wait for ack from next forwarded */
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radio_uip_wait_for_ack(&uip_buf[UIP_LLH_LEN], uip_len);
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#endif
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d->send(&uip_buf[UIP_LLH_LEN], uip_len);
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#if BAD_REPLY_ON_NO_ROUTE
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} else {
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NOT IMPLEMENTED
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#endif
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}
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}
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/*---------------------------------------------------------------------------*/
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u8_t
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radio_uip_uaodv_send(void)
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{
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/* uAODV RREQ messages should be sent as usual */
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if (radio_uip_uaodv_dest_port(&uip_buf[UIP_LLH_LEN], uip_len) == HTONS(UAODV_UDPPORT)) {
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struct uaodv_msg *m = (struct uaodv_msg *)&uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
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if (m->type == UAODV_RREQ_TYPE) {
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uip_len = hc_compress(&uip_buf[UIP_LLH_LEN], uip_len);
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return radio->send(&uip_buf[UIP_LLH_LEN], uip_len);
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}
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/* uAODV RREP and RERR messages should be acked */
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#if UNICAST_ACKED
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radio_uip_wait_for_ack(&uip_buf[UIP_LLH_LEN], uip_len);
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#endif
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uip_len = hc_compress(&uip_buf[UIP_LLH_LEN], uip_len);
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return radio->send(&uip_buf[UIP_LLH_LEN], uip_len);
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}
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if (radio_uip_uaodv_is_broadcast(uip_udp_sender())) {
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uip_len = hc_compress(&uip_buf[UIP_LLH_LEN], uip_len);
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/* We can use the broadcast address immediately */
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uip_len = radio_uip_uaodv_add_header(&uip_buf[UIP_LLH_LEN], uip_len, uip_udp_sender()); /* TODO Correct? */
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} else {
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uip_len = hc_compress(&uip_buf[UIP_LLH_LEN], uip_len);
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/* Fetch uAODV route (must be prepared!) */
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route = uaodv_rt_lookup((&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->destipaddr));
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if (route == NULL) return UIP_FW_NOROUTE;
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uip_len = radio_uip_uaodv_add_header(&uip_buf[UIP_LLH_LEN], uip_len, &route->nexthop); /* TODO Correct? */
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#if UNICAST_ACKED
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/* We expect to get an ack for this unicast packet */
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radio_uip_wait_for_ack(&uip_buf[UIP_LLH_LEN], uip_len);
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#endif
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}
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return radio->send(&uip_buf[UIP_LLH_LEN], uip_len);
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}
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/*---------------------------------------------------------------------------*/
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void
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radio_uip_uaodv_init(const struct radio_driver *d)
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{
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#if UNICAST_ACKED
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memb_init(&bufferedPacketsMEMB);
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list_init(bufferedPackets);
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process_start(&radio_uip_ack_process, NULL);
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#endif
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radio = d;
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radio->set_receive_function(receiver);
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radio->on();
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}
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#if UNICAST_ACKED
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/*---------------------------------------------------------------------------*/
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u16_t
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radio_uip_calc_crc(u8_t *buf, int len)
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{
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u16_t crcacc = 0xffff;
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int counter;
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for (counter = 0; counter < len; counter++) {
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crcacc = crc16_add(buf[counter], crcacc);
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}
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return crcacc;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_wait_for_ack(u8_t *buf, int len)
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{
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struct bufferedPacket *bufPacket;
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/* Allocate storage memory */
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bufPacket = (struct bufferedPacket *)memb_alloc(&bufferedPacketsMEMB);
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if (bufPacket == NULL) {
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return 1;
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}
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/* Store packet specific data and set timer */
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memcpy(bufPacket->data, buf, len);
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bufPacket->len = len;
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bufPacket->resends = 0;
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bufPacket->acked = 0;
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bufPacket->crc = radio_uip_calc_crc(&uip_buf[UIP_LLH_LEN], uip_len);
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PROCESS_CONTEXT_BEGIN(&radio_uip_ack_process);
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etimer_set(&bufPacket->etimer, CLOCK_SECOND * 1);
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PROCESS_CONTEXT_END(&radio_uip_ack_process);
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/* Add to list for later reference */
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list_add(bufferedPackets, bufPacket);
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_is_ack(u8_t *buf, int len)
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{
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struct bufferedPacket *bufPacket;
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if (uip_len != ACK_LENGTH)
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return 0;
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return strncmp(buf, uniqueAckHeader, ACK_HEADER_LENGTH) == 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_handle_ack(u8_t *buf, int len)
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{
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struct bufferedPacket *bufPacket;
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u16_t ackCRC;
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memcpy(&ackCRC, &buf[ACK_HEADER_LENGTH], 2);
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/* Locate which packet was acknowledged */
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for(bufPacket = list_head(bufferedPackets);
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bufPacket != NULL;
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bufPacket = bufPacket->next) {
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if (bufPacket->crc == ackCRC) {
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/* Signal packet has been acknowledged */
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bufPacket->acked = 1;
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return 0;
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}
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}
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return 1;
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}
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#endif
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_add_header(u8_t *buf, int len, uip_ipaddr_t *addr)
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{
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memcpy(&buf[HEADER_LENGTH], buf, len);
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memcpy(buf, uniqueFwdHeader, HEADER_ID_LENGTH);
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memcpy(&buf[HEADER_NEXT_FWD], (char*)addr, 4);
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return HEADER_LENGTH + len;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_remove_header(u8_t *buf, int len)
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{
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memcpy(buf, &buf[HEADER_LENGTH], len);
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return HEADER_LENGTH + len;
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return len - HEADER_LENGTH;
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}
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/*---------------------------------------------------------------------------*/
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void
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radio_uip_uaodv_change_header(u8_t *buf, int len, uip_ipaddr_t *addr)
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{
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memcpy(&buf[HEADER_NEXT_FWD], addr, 4);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_header_exists(u8_t *buf, int len)
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{
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return !memcmp(buf, uniqueFwdHeader, HEADER_ID_LENGTH);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_is_broadcast(uip_ipaddr_t *addr)
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{
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return ((u8_t*)addr)[3] == 255; /* TODO Only comparing with the last */
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_fwd_is_broadcast(u8_t *buf, int len)
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{
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return radio_uip_uaodv_is_broadcast((uip_ipaddr_t*) &buf[HEADER_NEXT_FWD]);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_fwd_is_me(u8_t *buf, int len)
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{
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return !memcmp(&buf[HEADER_NEXT_FWD], &uip_hostaddr, 4);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_dest_is_me(u8_t *buf, int len)
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{
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return !memcmp((&((struct uip_udpip_hdr *)buf)->destipaddr), &uip_hostaddr, 4);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_dest_port(u8_t *buf, int len)
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{
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if (len < sizeof(struct uip_udpip_hdr))
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return -1;
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return (int) ((struct uip_udpip_hdr *)buf)->destport;
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}
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/*---------------------------------------------------------------------------*/
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