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nes-proj/os/net/ipv6/uip-icmp6.c

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/*
* 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.
*
*/
/**
* \addtogroup uip
* @{
*/
/**
* \file
* ICMPv6 (RFC 4443) implementation, with message and error handling
* \author Julien Abeille <jabeille@cisco.com>
* \author Mathilde Durvy <mdurvy@cisco.com>
*/
#include <string.h>
#include "net/ipv6/uip-ds6.h"
#include "net/ipv6/uip-icmp6.h"
#include "contiki-default-conf.h"
/* Log configuration */
#include "sys/log.h"
#define LOG_MODULE "ICMPv6"
#define LOG_LEVEL LOG_LEVEL_IPV6
#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])
#define UIP_EXT_BUF ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#define UIP_FIRST_EXT_BUF ((struct uip_ext_hdr *)&uip_buf[UIP_LLIPH_LEN])
#if UIP_CONF_IPV6_RPL
#if UIP_CONF_IPV6_RPL_LITE == 1
#include "net/rpl-lite/rpl.h"
#else /* UIP_CONF_IPV6_RPL_LITE == 1 */
#include "net/rpl-classic/rpl.h"
#include "net/rpl-classic/rpl-private.h"
#endif /* UIP_CONF_IPV6_RPL_LITE == 1 */
#endif /* UIP_CONF_IPV6_RPL */
/** \brief temporary IP address */
static uip_ipaddr_t tmp_ipaddr;
LIST(echo_reply_callback_list);
/*---------------------------------------------------------------------------*/
/* List of input handlers */
LIST(input_handler_list);
/*---------------------------------------------------------------------------*/
static uip_icmp6_input_handler_t *
input_handler_lookup(uint8_t type, uint8_t icode)
{
uip_icmp6_input_handler_t *handler = NULL;
for(handler = list_head(input_handler_list);
handler != NULL;
handler = list_item_next(handler)) {
if(handler->type == type &&
(handler->icode == icode ||
handler->icode == UIP_ICMP6_HANDLER_CODE_ANY)) {
return handler;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
uint8_t
uip_icmp6_input(uint8_t type, uint8_t icode)
{
uip_icmp6_input_handler_t *handler = input_handler_lookup(type, icode);
if(handler == NULL) {
return UIP_ICMP6_INPUT_ERROR;
}
if(handler->handler == NULL) {
return UIP_ICMP6_INPUT_ERROR;
}
handler->handler();
return UIP_ICMP6_INPUT_SUCCESS;
}
/*---------------------------------------------------------------------------*/
void
uip_icmp6_register_input_handler(uip_icmp6_input_handler_t *handler)
{
list_add(input_handler_list, handler);
}
/*---------------------------------------------------------------------------*/
static void
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
*/
LOG_INFO("Received Echo Request from ");
LOG_INFO_6ADDR(&UIP_IP_BUF->srcipaddr);
LOG_INFO_(" to ");
LOG_INFO_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_INFO_("\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) {
/* Remove extension headers if any */
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((uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN - uip_ext_len,
(uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
(uip_len - UIP_IPH_LEN - UIP_ICMPH_LEN));
uip_ext_len = 0;
}
/* Below is important for the correctness of UIP_ICMP_BUF and the
* checksum
*/
/* 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();
LOG_INFO("Sending Echo Reply to ");
LOG_INFO_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_INFO_(" from ");
LOG_INFO_6ADDR(&UIP_IP_BUF->srcipaddr);
LOG_INFO_("\n");
UIP_STAT(++uip_stat.icmp.sent);
return;
}
/*---------------------------------------------------------------------------*/
void
uip_icmp6_error_output(uint8_t type, uint8_t code, uint32_t param) {
/* check if originating packet is not an ICMP error */
if(uip_ext_len) {
if(UIP_EXT_BUF->next == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128) {
uip_clear_buf();
return;
}
} else {
if(UIP_IP_BUF->proto == UIP_PROTO_ICMP6 && UIP_ICMP_BUF->type < 128) {
uip_clear_buf();
return;
}
}
#if UIP_CONF_IPV6_RPL
rpl_ext_header_remove();
#else
uip_ext_len = 0;
#endif /* UIP_CONF_IPV6_RPL */
/* 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((uint8_t *)UIP_ICMP6_ERROR_BUF + uip_ext_len + UIP_ICMP6_ERROR_LEN,
(void *)UIP_IP_BUF, uip_len - UIP_IPICMPH_LEN - uip_ext_len - UIP_ICMP6_ERROR_LEN);
UIP_IP_BUF->vtc = 0x60;
UIP_IP_BUF->tcflow = 0;
UIP_IP_BUF->flow = 0;
if (uip_ext_len) {
UIP_FIRST_EXT_BUF->next = UIP_PROTO_ICMP6;
} else {
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_clear_buf();
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_clear_buf();
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);
LOG_WARN("Sending ICMPv6 ERROR message type %d code %d to ", type, code);
LOG_WARN_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_WARN_(" from ");
LOG_WARN_6ADDR(&UIP_IP_BUF->srcipaddr);
LOG_WARN_("\n");
return;
}
/*---------------------------------------------------------------------------*/
void
uip_icmp6_send(const uip_ipaddr_t *dest, int type, int code, int payload_len)
{
LOG_INFO("Sending ICMPv6 packet to ");
LOG_INFO_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_INFO_(", type %u, code %u, len %u\n", type, code, 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;
UIP_STAT(++uip_stat.icmp.sent);
UIP_STAT(++uip_stat.ip.sent);
tcpip_ipv6_output();
}
/*---------------------------------------------------------------------------*/
static void
echo_reply_input(void)
{
int ttl;
uip_ipaddr_t sender;
LOG_INFO("Received Echo Reply from ");
LOG_INFO_6ADDR(&UIP_IP_BUF->srcipaddr);
LOG_INFO_(" to ");
LOG_INFO_6ADDR(&UIP_IP_BUF->destipaddr);
LOG_INFO_("\n");
uip_ipaddr_copy(&sender, &UIP_IP_BUF->srcipaddr);
ttl = UIP_IP_BUF->ttl;
if(uip_ext_len > 0) {
/* Remove extension headers if any */
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 reply 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((uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN - uip_ext_len,
(uint8_t *)UIP_ICMP_BUF + UIP_ICMPH_LEN,
(uip_len - UIP_IPH_LEN - UIP_ICMPH_LEN));
uip_ext_len = 0;
}
/* Call all registered applications to let them know an echo reply
has been received. */
{
struct uip_icmp6_echo_reply_notification *n;
for(n = list_head(echo_reply_callback_list);
n != NULL;
n = list_item_next(n)) {
if(n->callback != NULL) {
n->callback(&sender, ttl,
(uint8_t *)&UIP_ICMP_BUF[sizeof(struct uip_icmp_hdr)],
uip_len - sizeof(struct uip_icmp_hdr) - UIP_IPH_LEN);
}
}
}
uip_clear_buf();
return;
}
/*---------------------------------------------------------------------------*/
void
uip_icmp6_echo_reply_callback_add(struct uip_icmp6_echo_reply_notification *n,
uip_icmp6_echo_reply_callback_t c)
{
if(n != NULL && c != NULL) {
n->callback = c;
list_add(echo_reply_callback_list, n);
}
}
/*---------------------------------------------------------------------------*/
void
uip_icmp6_echo_reply_callback_rm(struct uip_icmp6_echo_reply_notification *n)
{
list_remove(echo_reply_callback_list, n);
}
/*---------------------------------------------------------------------------*/
UIP_ICMP6_HANDLER(echo_request_handler, ICMP6_ECHO_REQUEST,
UIP_ICMP6_HANDLER_CODE_ANY, echo_request_input);
UIP_ICMP6_HANDLER(echo_reply_handler, ICMP6_ECHO_REPLY,
UIP_ICMP6_HANDLER_CODE_ANY, echo_reply_input);
/*---------------------------------------------------------------------------*/
void
uip_icmp6_init()
{
/* Register Echo Request and Reply handlers */
uip_icmp6_register_input_handler(&echo_request_handler);
uip_icmp6_register_input_handler(&echo_reply_handler);
}
/*---------------------------------------------------------------------------*/
/** @} */
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