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nes-proj/core/net/uip-icmp6.c

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/**
* \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-ds6.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_ds6_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_ds6_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;
/* check if originating packet is not an ICMP error*/
if(UIP_IP_BUF->proto == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128){
uip_len = 0;
return;
}
/* 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_ds6_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_ds6_select_src(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
} else {
uip_len = 0;
return;
}
} else {
#if UIP_CONF_ROUTER
/* need to pick a source that corresponds to this node */
uip_ds6_select_src(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
#else
uip_ipaddr_copy(&UIP_IP_BUF->srcipaddr, &tmp_ipaddr);
#endif
}
UIP_ICMP_BUF->type = type;
UIP_ICMP_BUF->icode = code;
UIP_ICMP6_ERROR_BUF->param = uip_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;
}
/*---------------------------------------------------------------------------*/
void
uip_icmp6_send(uip_ipaddr_t *dest, int type, int code, int payload_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_ds6_if.cur_hop_limit;
UIP_IP_BUF->len[0] = (UIP_ICMPH_LEN + payload_len) >> 8;
UIP_IP_BUF->len[1] = (UIP_ICMPH_LEN + payload_len) & 0xff;
memcpy(&UIP_IP_BUF->destipaddr, dest, sizeof(*dest));
uip_ds6_select_src(&UIP_IP_BUF->srcipaddr, &UIP_IP_BUF->destipaddr);
UIP_ICMP_BUF->type = type;
UIP_ICMP_BUF->icode = code;
UIP_ICMP_BUF->icmpchksum = 0;
UIP_ICMP_BUF->icmpchksum = ~uip_icmp6chksum();
uip_len = UIP_IPH_LEN + UIP_ICMPH_LEN + payload_len;
tcpip_ipv6_output();
}
/*---------------------------------------------------------------------------*/
/** @} */
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