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/ip_addr.h"
00041 #include "lwip/netif.h"
00042 
00043 #ifdef __cplusplus
00044 extern "C" {
00045 #endif
00046 
00047 #define ICMP_ER 0      /* echo reply */
00048 #define ICMP_DUR 3     /* destination unreachable */
00049 #define ICMP_SQ 4      /* source quench */
00050 #define ICMP_RD 5      /* redirect */
00051 #define ICMP_ECHO 8    /* echo */
00052 #define ICMP_TE 11     /* time exceeded */
00053 #define ICMP_PP 12     /* parameter problem */
00054 #define ICMP_TS 13     /* timestamp */
00055 #define ICMP_TSR 14    /* timestamp reply */
00056 #define ICMP_IRQ 15    /* information request */
00057 #define ICMP_IR 16     /* information reply */
00058 
00059 enum icmp_dur_type {
00060   ICMP_DUR_NET = 0,    /* net unreachable */
00061   ICMP_DUR_HOST = 1,   /* host unreachable */
00062   ICMP_DUR_PROTO = 2,  /* protocol unreachable */
00063   ICMP_DUR_PORT = 3,   /* port unreachable */
00064   ICMP_DUR_FRAG = 4,   /* fragmentation needed and DF set */
00065   ICMP_DUR_SR = 5      /* source route failed */
00066 };
00067 
00068 enum icmp_te_type {
00069   ICMP_TE_TTL = 0,     /* time to live exceeded in transit */
00070   ICMP_TE_FRAG = 1     /* fragment reassembly time exceeded */
00071 };
00072 
00073 void icmp_input(struct pbuf *p, struct netif *inp);
00074 
00075 void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
00076 void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);
00077 
00078 #ifdef PACK_STRUCT_USE_INCLUDES
00079 #  include "arch/bpstruct.h"
00080 #endif
00081 PACK_STRUCT_BEGIN
00082 struct icmp_echo_hdr {
00083   PACK_STRUCT_FIELD(u16_t _type_code);
00084   PACK_STRUCT_FIELD(u16_t chksum);
00085   PACK_STRUCT_FIELD(u16_t id);
00086   PACK_STRUCT_FIELD(u16_t seqno);
00087 } PACK_STRUCT_STRUCT;
00088 PACK_STRUCT_END
00089 
00090 PACK_STRUCT_BEGIN
00091 struct icmp_dur_hdr {
00092   PACK_STRUCT_FIELD(u16_t _type_code);
00093   PACK_STRUCT_FIELD(u16_t chksum);
00094   PACK_STRUCT_FIELD(u32_t unused);
00095 } PACK_STRUCT_STRUCT;
00096 PACK_STRUCT_END
00097 
00098 PACK_STRUCT_BEGIN
00099 struct icmp_te_hdr {
00100   PACK_STRUCT_FIELD(u16_t _type_code);
00101   PACK_STRUCT_FIELD(u16_t chksum);
00102   PACK_STRUCT_FIELD(u32_t unused);
00103 } PACK_STRUCT_STRUCT;
00104 PACK_STRUCT_END
00105 #ifdef PACK_STRUCT_USE_INCLUDES
00106 #  include "arch/epstruct.h"
00107 #endif
00108 
00109 #define ICMPH_TYPE(hdr) (ntohs((hdr)->_type_code) >> 8)
00110 #define ICMPH_CODE(hdr) (ntohs((hdr)->_type_code) & 0xff)
00111 
00112 #define ICMPH_TYPE_SET(hdr, type) ((hdr)->_type_code = htons(ICMPH_CODE(hdr) | ((type) << 8)))
00113 #define ICMPH_CODE_SET(hdr, code) ((hdr)->_type_code = htons((code) | (ICMPH_TYPE(hdr) << 8)))
00114 
00115 #ifdef __cplusplus
00116 }
00117 #endif
00118 
00119 #endif /* LWIP_ICMP */
00120 
00121 #endif /* __LWIP_ICMP_H__ */