icmp.h

00001 /*
00002  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
00003  * All rights reserved. 
00004  * 
00005  * Redistribution and use in source and binary forms, with or without modification, 
00006  * are permitted provided that the following conditions are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright notice,
00009  *    this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright notice,
00011  *    this list of conditions and the following disclaimer in the documentation
00012  *    and/or other materials provided with the distribution.
00013  * 3. The name of the author may not be used to endorse or promote products
00014  *    derived from this software without specific prior written permission. 
00015  *
00016  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
00017  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00018  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
00019  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00020  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
00021  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
00024  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
00025  * OF SUCH DAMAGE.
00026  *
00027  * This file is part of the lwIP TCP/IP stack.
00028  * 
00029  * Author: Adam Dunkels <adam@sics.se>
00030  *
00031  */
00032 #ifndef __LWIP_ICMP_H__
00033 #define __LWIP_ICMP_H__
00034 
00035 #include "lwip/opt.h"
00036 
00037 #if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
00038 
00039 #include "lwip/pbuf.h"
00040 #include "lwip/netif.h"
00041 
00042 #ifdef __cplusplus
00043 extern "C" {
00044 #endif
00045 
00046 #define ICMP6_DUR  1
00047 #define ICMP6_TE   3
00048 #define ICMP6_ECHO 128    /* echo */
00049 #define ICMP6_ER   129      /* echo reply */
00050 
00051 
00052 enum icmp_dur_type {
00053   ICMP_DUR_NET = 0,    /* net unreachable */
00054   ICMP_DUR_HOST = 1,   /* host unreachable */
00055   ICMP_DUR_PROTO = 2,  /* protocol unreachable */
00056   ICMP_DUR_PORT = 3,   /* port unreachable */
00057   ICMP_DUR_FRAG = 4,   /* fragmentation needed and DF set */
00058   ICMP_DUR_SR = 5      /* source route failed */
00059 };
00060 
00061 enum icmp_te_type {
00062   ICMP_TE_TTL = 0,     /* time to live exceeded in transit */
00063   ICMP_TE_FRAG = 1     /* fragment reassembly time exceeded */
00064 };
00065 
00066 void icmp_input(struct pbuf *p, struct netif *inp);
00067 
00068 void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
00069 void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);
00070 
00071 struct icmp_echo_hdr {
00072   u8_t type;
00073   u8_t icode;
00074   u16_t chksum;
00075   u16_t id;
00076   u16_t seqno;
00077 };
00078 
00079 struct icmp_dur_hdr {
00080   u8_t type;
00081   u8_t icode;
00082   u16_t chksum;
00083   u32_t unused;
00084 };
00085 
00086 struct icmp_te_hdr {
00087   u8_t type;
00088   u8_t icode;
00089   u16_t chksum;
00090   u32_t unused;
00091 };
00092 
00093 #ifdef __cplusplus
00094 }
00095 #endif
00096 
00097 #endif /* LWIP_ICMP */
00098 
00099 #endif /* __LWIP_ICMP_H__ */
00100