419 lines
13 KiB
C
419 lines
13 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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*/
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#include "radio-uip-uaodv.h"
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#include "net/ip/uip.h"
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#include "net/uaodv.h"
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#include "net/ipv4/uaodv-rt.h"
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#include "net/ipv4/uaodv-def.h"
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#include "lib/crc16.h"
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#include "list.h"
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#include <string.h>
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#include <stdio.h>
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/* Packet buffer size and retransmission settings */
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#define MAX_BUFFERED_PACKETS 10
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#define MAX_RETRANSMISSIONS_RREP 16
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#define MAX_RETRANSMISSIONS_UNICAST 16
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/* Forward packet (header) */
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#define FWD_ID "fWd:"
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#define FWD_ID_LENGTH 4
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#define FWD_NEXT_IP FWD_ID_LENGTH
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#define FWD_PACKET_LENGTH (FWD_NEXT_IP + 4)
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/* Acknowledgement packet */
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#define ACK_ID "aCk"
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#define ACK_ID_LENGTH 3
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#define ACK_CRC ACK_ID_LENGTH
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#define ACK_PACKET_LENGTH (ACK_ID_LENGTH + 2)
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#define ACK_TIMEOUT (CLOCK_SECOND / 50) * (random_rand() % 100)
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enum {
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EVENT_SEND_ACK
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};
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struct buf_packet {
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struct buf_packet *next;
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uint8_t data[UIP_BUFSIZE];
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int len;
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uint8_t resends;
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uint8_t acked;
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uint8_t want_ack;
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uint16_t crc;
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uip_ipaddr_t finaldest;
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struct etimer etimer;
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};
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LIST(buf_packet_list);
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MEMB(buf_packet_mem, struct buf_packet, MAX_BUFFERED_PACKETS);
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PROCESS(radio_uip_process, "radio uIP uAODV process");
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static const struct radio_driver *radio;
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/*---------------------------------------------------------------------------*/
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static void receiver(const struct radio_driver *d);
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uint8_t radio_uip_uaodv_send(void);
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void radio_uip_uaodv_init(const struct radio_driver *d);
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int radio_uip_handle_ack(uint8_t *buf, int len);
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uint16_t radio_uip_calc_crc(uint8_t *buf, int len);
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int radio_uip_buffer_outgoing_packet(uint8_t *buf, int len, uip_ipaddr_t *dest, int max_sends);
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int radio_uip_is_ack(uint8_t *buf, int len);
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int radio_uip_uaodv_add_header(uint8_t *buf, int len, uip_ipaddr_t *addr);
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int radio_uip_uaodv_remove_header(uint8_t *buf, int len);
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void radio_uip_uaodv_change_header(uint8_t *buf, int len, uip_ipaddr_t *addr);
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int radio_uip_uaodv_header_exists(uint8_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(uint8_t *buf, int len);
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int radio_uip_uaodv_fwd_is_me(uint8_t *buf, int len);
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int radio_uip_uaodv_dest_is_me(uint8_t *buf, int len);
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int radio_uip_uaodv_dest_port(uint8_t *buf, int len);
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/*---------------------------------------------------------------------------*/
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/* Main process - handles (re)transmissions and acks */
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PROCESS_THREAD(radio_uip_process, ev, data)
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{
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struct buf_packet *packet;
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PROCESS_BEGIN();
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while(1) {
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PROCESS_YIELD();
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if(ev == EVENT_SEND_ACK) {
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/* Prepare and send ack for given 16-bit CRC */
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uint8_t ackPacket[ACK_PACKET_LENGTH];
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memcpy(ackPacket, ACK_ID, ACK_ID_LENGTH);
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ackPacket[ACK_CRC] = ((uint16_t) data >> 8);
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ackPacket[ACK_CRC+1] = ((uint16_t) data & 0xff);
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radio->send(ackPacket, ACK_PACKET_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(packet = list_head(buf_packet_list);
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packet != NULL;
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packet = packet->next) {
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if (etimer_expired(&packet->etimer)) {
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if (packet->acked) {
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/* Already acked packet, remove silently */
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list_remove(buf_packet_list, packet);
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memb_free(&buf_packet_mem, packet);
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} else if (packet->resends > 0) {
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/* Resend packet */
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packet->resends--;
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etimer_set(&packet->etimer, ACK_TIMEOUT);
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radio->send(packet->data, packet->len);
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} else {
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/* Packet was resent maximum number of times */
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/* If an ack was expected, flag destination to bad */
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if (packet->want_ack && !uip_ipaddr_cmp(&packet->finaldest, &uip_broadcast_addr)) {
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uaodv_bad_dest(&packet->finaldest);
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}
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list_remove(buf_packet_list, packet);
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memb_free(&buf_packet_mem, 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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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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/* Detect and handle 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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/* If no uAODV header, receive as usual */
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if (!radio_uip_uaodv_header_exists(&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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{
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/* Send ack as soon as possible */
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uint16_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_process, EVENT_SEND_ACK, (void*) (uint32_t) crc);
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}
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/* Strip header and receive packet */
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uip_len = radio_uip_uaodv_remove_header(&uip_buf[UIP_LLH_LEN], uip_len);
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tcpip_input();
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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radio_uip_uaodv_send(void)
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{
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struct uaodv_rt_entry *route;
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/* Transmit broadcast packets without header */
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if (radio_uip_uaodv_is_broadcast(&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->destipaddr)) {
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return radio_uip_buffer_outgoing_packet(&uip_buf[UIP_LLH_LEN], uip_len, (void*) &uip_broadcast_addr, 1);
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}
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/* Transmit uAODV packets with headers but without using route table */
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if (((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->proto == UIP_PROTO_UDP
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&& radio_uip_uaodv_dest_port(&uip_buf[UIP_LLH_LEN], uip_len) == UIP_HTONS(UAODV_UDPPORT)) {
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uip_ipaddr_t nexthop;
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memcpy(&nexthop, &((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->destipaddr, 4);
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uip_len = radio_uip_uaodv_add_header(
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&uip_buf[UIP_LLH_LEN],
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uip_len,
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&nexthop
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);
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/* Buffer packet for persistent transmission */
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return radio_uip_buffer_outgoing_packet(
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&uip_buf[UIP_LLH_LEN],
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uip_len,
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&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN + FWD_PACKET_LENGTH])->destipaddr,
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MAX_RETRANSMISSIONS_RREP);
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}
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/* Fetch already prepared uAODV route */
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route = uaodv_rt_lookup_any((&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->destipaddr));
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if (route == NULL || route->is_bad) {
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/* If we are forwarding, notify origin of this bad route */
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if (tcpip_is_forwarding) {
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uaodv_bad_dest((&((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])->destipaddr));
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}
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return UIP_FW_DROPPED;
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}
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/* Add header and buffer packet for persistent transmission */
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uip_len = radio_uip_uaodv_add_header(&uip_buf[UIP_LLH_LEN], uip_len, uip_ds6_route_nexthop(route)); /* TODO Correct? */
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return radio_uip_buffer_outgoing_packet(
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&uip_buf[UIP_LLH_LEN],
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uip_len,
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&route->dest,
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MAX_RETRANSMISSIONS_UNICAST);
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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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/* Prepare buffers and start main process */
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memb_init(&buf_packet_mem);
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list_init(buf_packet_list);
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process_start(&radio_uip_process, NULL);
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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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/*---------------------------------------------------------------------------*/
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uint16_t
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radio_uip_calc_crc(uint8_t *buf, int len)
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{
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uint16_t crcacc = 0xffff;
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int counter;
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/* TODO Not effective */
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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_buffer_outgoing_packet(uint8_t *buf, int len, uip_ipaddr_t *dest, int max_sends)
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{
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struct buf_packet *packet;
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uint16_t crc;
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/* Calculate packet's unique CRC */
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crc = radio_uip_calc_crc(&uip_buf[UIP_LLH_LEN], uip_len);
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/* Check if this packet is already being transmitted */
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for(packet = list_head(buf_packet_list);
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packet != NULL;
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packet = packet->next) {
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if (packet->crc == crc) {
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return UIP_FW_DROPPED;
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}
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}
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/* Allocate storage memory */
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packet = (struct buf_packet *)memb_alloc(&buf_packet_mem);
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if (packet == NULL) {
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return UIP_FW_DROPPED;
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}
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/* Prepare packet buffer */
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memcpy(packet->data, buf, len);
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packet->len = len;
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packet->resends = max_sends;
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packet->acked = 0;
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if (packet->resends > 1)
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packet->want_ack = 1;
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else
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packet->want_ack = 0;
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memcpy(&packet->finaldest, dest, 4);
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packet->crc = crc;
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/* Set first transmission to as soon as possible */
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PROCESS_CONTEXT_BEGIN(&radio_uip_process);
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etimer_set(&packet->etimer, 0);
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PROCESS_CONTEXT_END(&radio_uip_process);
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/* Add to buffered packets list */
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list_add(buf_packet_list, packet);
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return UIP_FW_OK;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_is_ack(uint8_t *buf, int len)
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{
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if (len != ACK_PACKET_LENGTH)
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return 0;
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return memcmp(buf, ACK_ID, ACK_ID_LENGTH) == 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_handle_ack(uint8_t *buf, int len)
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{
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struct buf_packet *packet;
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uint16_t ackCRC;
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ackCRC = (uint16_t) (buf[ACK_CRC] << 8) + (uint16_t) (0xff&buf[ACK_CRC+1]);
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/* Locate which packet was acknowledged */
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for(packet = list_head(buf_packet_list);
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packet != NULL;
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packet = packet->next) {
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if (packet->crc == ackCRC) {
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/* Signal packet has been acknowledged */
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packet->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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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_add_header(uint8_t *buf, int len, uip_ipaddr_t *addr)
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{
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uint8_t tempbuf[len];
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memcpy(tempbuf, buf, len);
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memcpy(&buf[FWD_PACKET_LENGTH], tempbuf, len);
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memcpy(buf, FWD_ID, FWD_ID_LENGTH);
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memcpy(&buf[FWD_NEXT_IP], (char*)addr, 4);
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return FWD_PACKET_LENGTH + len;
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_remove_header(uint8_t *buf, int len)
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{
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uint8_t tempbuf[len];
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memcpy(tempbuf, &buf[FWD_PACKET_LENGTH], len);
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memcpy(buf, tempbuf, len);
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return len - FWD_PACKET_LENGTH;
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}
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/*---------------------------------------------------------------------------*/
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void
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radio_uip_uaodv_change_header(uint8_t *buf, int len, uip_ipaddr_t *addr)
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{
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memcpy(&buf[FWD_NEXT_IP], addr, 4);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_header_exists(uint8_t *buf, int len)
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{
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return !memcmp(buf, FWD_ID, FWD_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 uip_ipaddr_cmp(addr, &uip_broadcast_addr);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_fwd_is_broadcast(uint8_t *buf, int len)
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{
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return radio_uip_uaodv_is_broadcast((uip_ipaddr_t*) &buf[FWD_NEXT_IP]);
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}
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/*---------------------------------------------------------------------------*/
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int
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radio_uip_uaodv_fwd_is_me(uint8_t *buf, int len)
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{
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return !memcmp(&buf[FWD_NEXT_IP], &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(uint8_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(uint8_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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