/* * Copyright (c) 2001-2003 Swedish Institute of Computer Science. * 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 lwIP TCP/IP stack. *  * Author: Adam Dunkels <adam@sics.se> * */#ifndef __LWIP_ICMP_H__#define __LWIP_ICMP_H__#include "lwip/arch.h"#include "lwip/opt.h"#include "lwip/pbuf.h"#include "lwip/netif.h"#define ICMP_ER 0      /* echo reply */#define ICMP_DUR 3     /* destination unreachable */#define ICMP_SQ 4      /* source quench */#define ICMP_RD 5      /* redirect */#define ICMP_ECHO 8    /* echo */#define ICMP_TE 11     /* time exceeded */#define ICMP_PP 12     /* parameter problem */#define ICMP_TS 13     /* timestamp */#define ICMP_TSR 14    /* timestamp reply */#define ICMP_IRQ 15    /* information request */#define ICMP_IR 16     /* information reply */enum icmp_dur_type {  ICMP_DUR_NET = 0,    /* net unreachable */  ICMP_DUR_HOST = 1,   /* host unreachable */  ICMP_DUR_PROTO = 2,  /* protocol unreachable */  ICMP_DUR_PORT = 3,   /* port unreachable */  ICMP_DUR_FRAG = 4,   /* fragmentation needed and DF set */  ICMP_DUR_SR = 5      /* source route failed */};enum icmp_te_type {  ICMP_TE_TTL = 0,     /* time to live exceeded in transit */  ICMP_TE_FRAG = 1     /* fragment reassembly time exceeded */};void icmp_input(struct pbuf *p, struct netif *inp);void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);#ifdef PACK_STRUCT_USE_INCLUDES#  include "arch/bpstruct.h"#endifPACK_STRUCT_BEGINstruct icmp_echo_hdr {  PACK_STRUCT_FIELD(u16_t _type_code);  PACK_STRUCT_FIELD(u16_t chksum);  PACK_STRUCT_FIELD(u16_t id);  PACK_STRUCT_FIELD(u16_t seqno);} PACK_STRUCT_STRUCT;PACK_STRUCT_ENDPACK_STRUCT_BEGINstruct icmp_dur_hdr {  PACK_STRUCT_FIELD(u16_t _type_code);  PACK_STRUCT_FIELD(u16_t chksum);  PACK_STRUCT_FIELD(u32_t unused);} PACK_STRUCT_STRUCT;PACK_STRUCT_ENDPACK_STRUCT_BEGINstruct icmp_te_hdr {  PACK_STRUCT_FIELD(u16_t _type_code);  PACK_STRUCT_FIELD(u16_t chksum);  PACK_STRUCT_FIELD(u32_t unused);} PACK_STRUCT_STRUCT;PACK_STRUCT_END#ifdef PACK_STRUCT_USE_INCLUDES#  include "arch/epstruct.h"#endif#define ICMPH_TYPE(hdr) (ntohs((hdr)->_type_code) >> 8)#define ICMPH_CODE(hdr) (ntohs((hdr)->_type_code) & 0xff)#define ICMPH_TYPE_SET(hdr, type) ((hdr)->_type_code = htons(ICMPH_CODE(hdr) | ((type) << 8)))#define ICMPH_CODE_SET(hdr, code) ((hdr)->_type_code = htons((code) | (ICMPH_TYPE(hdr) << 8)))#endif /* __LWIP_ICMP_H__ */