/**
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* \addtogroup uip6
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* @{
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*/
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/**
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* \file
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* ICMPv6 echo request and error messages (RFC 4443)
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* \author Julien Abeille <jabeille@cisco.com>
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* \author Mathilde Durvy <mdurvy@cisco.com>
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*/
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/*
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* Copyright (c) 2001-2003, Adam Dunkels.
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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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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*/
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#include <string.h>
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#include "net/uip-ds6.h"
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#include "net/uip-icmp6.h"
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#include "contiki-default-conf.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
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#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",lladdr->addr[0], lladdr->addr[1], lladdr->addr[2], lladdr->addr[3],lladdr->addr[4], lladdr->addr[5])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#endif
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define UIP_ICMP_BUF ((struct uip_icmp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define UIP_ICMP6_ERROR_BUF ((struct uip_icmp6_error *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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#define UIP_EXT_BUF ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define UIP_FIRST_EXT_BUF ((struct uip_ext_hdr *)&uip_buf[UIP_LLIPH_LEN])
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/** \brief temporary IP address */
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static uip_ipaddr_t tmp_ipaddr;
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#if UIP_CONF_IPV6_RPL
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#include "rpl/rpl.h"
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#endif /* UIP_CONF_IPV6_RPL */
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#if UIP_CONF_IPV6
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/*---------------------------------------------------------------------------*/
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void
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uip_icmp6_echo_request_input(void)
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{
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#if UIP_CONF_IPV6_RPL
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uint8_t temp_ext_len;
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#endif /* UIP_CONF_IPV6_RPL */
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/*
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* we send an echo reply. It is trivial if there was no extension
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* headers in the request otherwise we need to remove the extension
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* headers and change a few fields
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*/
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PRINTF("Received Echo Request from");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF("to");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("\n");
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/* IP header */
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UIP_IP_BUF->ttl = uip_ds6_if.cur_hop_limit;
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if(uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)){
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uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
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uip_ds6_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
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} else {
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uip_ipaddr_copy(&tmp_ipaddr, &UIP_IP_BUF->srcipaddr);
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uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
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uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &tmp_ipaddr);
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}
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if(uip_ext_len > 0) {
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#if UIP_CONF_IPV6_RPL
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if((temp_ext_len = rpl_invert_header())) {
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/* If there were other extension headers*/
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UIP_FIRST_EXT_BUF->next = UIP_PROTO_ICMP6;
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if (uip_ext_len != temp_ext_len) {
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uip_len -= (uip_ext_len - temp_ext_len);
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UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
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UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
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/* move the echo request payload (starting after the icmp header)
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* to the new location in the reply.
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* The shift is equal to the length of the remaining extension headers present
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* Note: UIP_ICMP_BUF still points to the echo request at this stage
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*/
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memmove((uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN - (uip_ext_len - temp_ext_len),
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(uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
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(uip_len - UIP_IPH_LEN - temp_ext_len - UIP_ICMPH_LEN));
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}
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uip_ext_len = temp_ext_len;
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} else {
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#endif /* UIP_CONF_IPV6_RPL */
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/* If there were extension headers*/
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UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
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uip_len -= uip_ext_len;
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UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
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UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
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/* move the echo request payload (starting after the icmp header)
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* to the new location in the reply.
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* The shift is equal to the length of the extension headers present
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* Note: UIP_ICMP_BUF still points to the echo request at this stage
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*/
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memmove((uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN - uip_ext_len,
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(uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
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(uip_len - UIP_IPH_LEN - UIP_ICMPH_LEN));
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uip_ext_len = 0;
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#if UIP_CONF_IPV6_RPL
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}
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#endif /* UIP_CONF_IPV6_RPL */
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}
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/* Below is important for the correctness of UIP_ICMP_BUF and the
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* checksum
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*/
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/* Note: now UIP_ICMP_BUF points to the beginning of the echo reply */
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UIP_ICMP_BUF->type = ICMP6_ECHO_REPLY;
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UIP_ICMP_BUF->icode = 0;
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UIP_ICMP_BUF->icmpchksum = 0;
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UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
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PRINTF("Sending Echo Reply to");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("from");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF("\n");
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UIP_STAT(++uip_stat.icmp.sent);
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return;
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}
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/*---------------------------------------------------------------------------*/
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void
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uip_icmp6_error_output(uint8_t type, uint8_t code, uint32_t param) {
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/* check if originating packet is not an ICMP error*/
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if (uip_ext_len) {
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if(UIP_EXT_BUF->next == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128){
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uip_len = 0;
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return;
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}
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} else {
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if(UIP_IP_BUF->proto == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128){
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uip_len = 0;
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return;
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}
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}
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#if UIP_CONF_IPV6_RPL
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uip_ext_len = rpl_invert_header();
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#else /* UIP_CONF_IPV6_RPL */
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uip_ext_len = 0;
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#endif /* UIP_CONF_IPV6_RPL */
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/* remember data of original packet before shifting */
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uip_ipaddr_copy(&tmp_ipaddr, &UIP_IP_BUF->destipaddr);
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uip_len += UIP_IPICMPH_LEN + UIP_ICMP6_ERROR_LEN;
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if(uip_len > UIP_LINK_MTU)
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uip_len = UIP_LINK_MTU;
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memmove((uint8_t *)UIP_ICMP6_ERROR_BUF + uip_ext_len + UIP_ICMP6_ERROR_LEN,
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(void *)UIP_IP_BUF, uip_len - UIP_IPICMPH_LEN - uip_ext_len - UIP_ICMP6_ERROR_LEN);
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UIP_IP_BUF->vtc = 0x60;
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UIP_IP_BUF->tcflow = 0;
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UIP_IP_BUF->flow = 0;
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if (uip_ext_len) {
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UIP_FIRST_EXT_BUF->next = UIP_PROTO_ICMP6;
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} else {
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UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
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}
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UIP_IP_BUF->ttl = uip_ds6_if.cur_hop_limit;
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/* the source should not be unspecified nor multicast, the check for
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multicast is done in uip_process */
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if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)){
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uip_len = 0;
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return;
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}
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uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
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if(uip_is_addr_mcast(&tmp_ipaddr)){
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if(type == ICMP6_PARAM_PROB && code == ICMP6_PARAMPROB_OPTION){
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uip_ds6_select_src(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
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} else {
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uip_len = 0;
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return;
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}
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} else {
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#if UIP_CONF_ROUTER
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/* need to pick a source that corresponds to this node */
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uip_ds6_select_src(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
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#else
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uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
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#endif
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}
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UIP_ICMP_BUF->type = type;
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UIP_ICMP_BUF->icode = code;
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UIP_ICMP6_ERROR_BUF->param = uip_htonl(param);
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UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
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UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
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UIP_ICMP_BUF->icmpchksum = 0;
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UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
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UIP_STAT(++uip_stat.icmp.sent);
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PRINTF("Sending ICMPv6 ERROR message to");
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PRINT6ADDR(&UIP_IP_BUF->destipaddr);
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PRINTF("from");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF("\n");
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return;
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}
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/*---------------------------------------------------------------------------*/
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void
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uip_icmp6_send(uip_ipaddr_t *dest, int type, int code, int payload_len)
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{
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UIP_IP_BUF->vtc = 0x60;
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UIP_IP_BUF->tcflow = 0;
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UIP_IP_BUF->flow = 0;
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UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
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UIP_IP_BUF->ttl = uip_ds6_if.cur_hop_limit;
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UIP_IP_BUF->len[0] = (UIP_ICMPH_LEN + payload_len) >> 8;
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UIP_IP_BUF->len[1] = (UIP_ICMPH_LEN + payload_len) & 0xff;
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memcpy(&UIP_IP_BUF->destipaddr, dest, sizeof(*dest));
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uip_ds6_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
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UIP_ICMP_BUF->type = type;
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UIP_ICMP_BUF->icode = code;
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UIP_ICMP_BUF->icmpchksum = 0;
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UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
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uip_len = UIP_IPH_LEN + UIP_ICMPH_LEN + payload_len;
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tcpip_ipv6_output();
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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#endif /* UIP_CONF_IPV6 */
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