186 lines
6.5 KiB
C
186 lines
6.5 KiB
C
/**
|
|
* \addtogroup uip6
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* ICMPv6 echo request and error messages (RFC 4443)
|
|
* \author Julien Abeille <jabeille@cisco.com>
|
|
* \author Mathilde Durvy <mdurvy@cisco.com>
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2001-2003, Adam Dunkels.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
|
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* This file is part of the uIP TCP/IP stack.
|
|
*
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "net/uip-netif.h"
|
|
#include "net/uip-icmp6.h"
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
|
|
#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])
|
|
#else
|
|
#define PRINTF(...)
|
|
#define PRINT6ADDR(addr)
|
|
#endif
|
|
|
|
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
|
|
#define UIP_ICMP_BUF ((struct uip_icmp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
|
|
#define UIP_ICMP6_ERROR_BUF ((struct uip_icmp6_error *)&uip_buf[uip_l2_l3_icmp_hdr_len])
|
|
|
|
/** \brief temporary IP address */
|
|
static uip_ipaddr_t tmp_ipaddr;
|
|
|
|
void
|
|
uip_icmp6_echo_request_input(void)
|
|
{
|
|
/*
|
|
* we send an echo reply. It is trivial if there was no extension
|
|
* headers in the request otherwise we need to remove the extension
|
|
* headers and change a few fields
|
|
*/
|
|
PRINTF("Received Echo Request from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("\n");
|
|
|
|
/* IP header */
|
|
UIP_IP_BUF->ttl = uip_netif_physical_if.cur_hop_limit;
|
|
|
|
if(uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)){
|
|
uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
|
|
uip_netif_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
|
|
} else {
|
|
uip_ipaddr_copy(&tmp_ipaddr, &UIP_IP_BUF->srcipaddr);
|
|
uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
|
|
uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &tmp_ipaddr);
|
|
}
|
|
|
|
if(uip_ext_len > 0) {
|
|
/* If there were extension headers*/
|
|
UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
|
|
uip_len -= uip_ext_len;
|
|
UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
|
|
UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
|
|
/* move the echo request payload (starting after the icmp header)
|
|
* to the new location in the reply.
|
|
* The shift is equal to the length of the extension headers present
|
|
* Note: UIP_ICMP_BUF still points to the echo request at this stage
|
|
*/
|
|
memmove((void *)UIP_ICMP_BUF + UIP_ICMPH_LEN - uip_ext_len,
|
|
(void *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
|
|
(uip_len - UIP_IPH_LEN - UIP_ICMPH_LEN));
|
|
}
|
|
/* Below is important for the correctness of UIP_ICMP_BUF and the
|
|
* checksum
|
|
*/
|
|
uip_ext_len = 0;
|
|
/* Note: now UIP_ICMP_BUF points to the beginning of the echo reply */
|
|
UIP_ICMP_BUF->type = ICMP6_ECHO_REPLY;
|
|
UIP_ICMP_BUF->icode = 0;
|
|
UIP_ICMP_BUF->icmpchksum = 0;
|
|
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
|
|
|
|
PRINTF("Sending Echo Reply to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("\n");
|
|
UIP_STAT(++uip_stat.icmp.sent);
|
|
return;
|
|
}
|
|
|
|
void
|
|
uip_icmp6_error_output(u8_t type, u8_t code, u32_t param) {
|
|
uip_ext_len = 0;
|
|
/* remember data of original packet before shifting */
|
|
uip_ipaddr_copy(&tmp_ipaddr, &UIP_IP_BUF->destipaddr);
|
|
|
|
uip_len += UIP_IPICMPH_LEN + UIP_ICMP6_ERROR_LEN;
|
|
|
|
if(uip_len > UIP_LINK_MTU)
|
|
uip_len = UIP_LINK_MTU;
|
|
|
|
memmove((void *)UIP_ICMP6_ERROR_BUF + UIP_ICMP6_ERROR_LEN,
|
|
(void *)UIP_IP_BUF, uip_len - UIP_IPICMPH_LEN - UIP_ICMP6_ERROR_LEN);
|
|
|
|
UIP_IP_BUF->vtc = 0x60;
|
|
UIP_IP_BUF->tcflow = 0;
|
|
UIP_IP_BUF->flow = 0;
|
|
UIP_IP_BUF->proto = UIP_PROTO_ICMP6;
|
|
UIP_IP_BUF->ttl = uip_netif_physical_if.cur_hop_limit;
|
|
|
|
/* the source should not be unspecified nor multicast, the check for
|
|
multicast is done in uip_process */
|
|
if(uip_is_addr_unspecified(&UIP_IP_BUF->srcipaddr)){
|
|
uip_len = 0;
|
|
return;
|
|
}
|
|
|
|
uip_ipaddr_copy(&UIP_IP_BUF->destipaddr, &UIP_IP_BUF->srcipaddr);
|
|
|
|
if(uip_is_addr_mcast(&tmp_ipaddr)){
|
|
if(type == ICMP6_PARAM_PROB && code == ICMP6_PARAMPROB_OPTION){
|
|
uip_netif_select_src(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
|
|
} else {
|
|
uip_len = 0;
|
|
return;
|
|
}
|
|
} else {
|
|
uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
|
|
}
|
|
|
|
UIP_ICMP_BUF->type = type;
|
|
UIP_ICMP_BUF->icode = code;
|
|
UIP_ICMP6_ERROR_BUF->param = htonl(param);
|
|
UIP_IP_BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
|
|
UIP_IP_BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
|
|
UIP_ICMP_BUF->icmpchksum = 0;
|
|
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
|
|
|
|
UIP_STAT(++uip_stat.icmp.sent);
|
|
|
|
PRINTF("Sending ICMPv6 ERROR message to");
|
|
PRINT6ADDR(&UIP_IP_BUF->destipaddr);
|
|
PRINTF("from");
|
|
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
|
|
PRINTF("\n");
|
|
return;
|
|
}
|
|
|
|
/** @} */
|