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jeremybenn |
/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef __LWIP_ICMP_H__
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#define __LWIP_ICMP_H__
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#include "lwip/arch.h"
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#include "lwip/opt.h"
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#include "lwip/pbuf.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#define ICMP_ER 0 /* echo reply */
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#define ICMP_DUR 3 /* destination unreachable */
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#define ICMP_SQ 4 /* source quench */
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#define ICMP_RD 5 /* redirect */
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#define ICMP_ECHO 8 /* echo */
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#define ICMP_TE 11 /* time exceeded */
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#define ICMP_PP 12 /* parameter problem */
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#define ICMP_TS 13 /* timestamp */
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#define ICMP_TSR 14 /* timestamp reply */
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#define ICMP_IRQ 15 /* information request */
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#define ICMP_IR 16 /* information reply */
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enum icmp_dur_type {
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ICMP_DUR_NET = 0, /* net unreachable */
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ICMP_DUR_HOST = 1, /* host unreachable */
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ICMP_DUR_PROTO = 2, /* protocol unreachable */
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ICMP_DUR_PORT = 3, /* port unreachable */
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ICMP_DUR_FRAG = 4, /* fragmentation needed and DF set */
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ICMP_DUR_SR = 5 /* source route failed */
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};
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enum icmp_te_type {
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ICMP_TE_TTL = 0, /* time to live exceeded in transit */
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ICMP_TE_FRAG = 1 /* fragment reassembly time exceeded */
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};
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void icmp_input(struct pbuf *p, struct netif *inp);
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void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
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void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct icmp_echo_hdr {
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PACK_STRUCT_FIELD(u16_t _type_code);
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PACK_STRUCT_FIELD(u16_t chksum);
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PACK_STRUCT_FIELD(u16_t id);
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PACK_STRUCT_FIELD(u16_t seqno);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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PACK_STRUCT_BEGIN
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struct icmp_dur_hdr {
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PACK_STRUCT_FIELD(u16_t _type_code);
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PACK_STRUCT_FIELD(u16_t chksum);
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PACK_STRUCT_FIELD(u32_t unused);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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PACK_STRUCT_BEGIN
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struct icmp_te_hdr {
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PACK_STRUCT_FIELD(u16_t _type_code);
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PACK_STRUCT_FIELD(u16_t chksum);
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PACK_STRUCT_FIELD(u32_t unused);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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#define ICMPH_TYPE(hdr) (ntohs((hdr)->_type_code) >> 8)
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#define ICMPH_CODE(hdr) (ntohs((hdr)->_type_code) & 0xff)
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#define ICMPH_TYPE_SET(hdr, type) ((hdr)->_type_code = htons(ICMPH_CODE(hdr) | ((type) << 8)))
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#define ICMPH_CODE_SET(hdr, code) ((hdr)->_type_code = htons((code) | (ICMPH_TYPE(hdr) << 8)))
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#endif /* __LWIP_ICMP_H__ */
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