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- /*
- * Copyright (c) 2001-2004 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/opt.h"
- #include "lwip/pbuf.h"
- #include "lwip/ip_addr.h"
- #include "lwip/netif.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- #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 */
- };
- #ifdef PACK_STRUCT_USE_INCLUDES
- # include "arch/bpstruct.h"
- #endif
- /** This is the standard ICMP header only that the u32_t data
- * is splitted to two u16_t like ICMP echo needs it.
- * This header is also used for other ICMP types that do not
- * use the data part.
- * 定义ICMP回送请求报文首部结构,
- * 由于所有ICMP报文首部有很大相似性,
- * 该结构同样适用于其它ICMP报文。
- */
- PACK_STRUCT_BEGIN
- struct icmp_echo_hdr {
- PACK_STRUCT_FIELD(u8_t type);
- PACK_STRUCT_FIELD(u8_t code);
- PACK_STRUCT_FIELD(u16_t chksum);
- PACK_STRUCT_FIELD(u16_t id);
- PACK_STRUCT_FIELD(u16_t seqno);
- } PACK_STRUCT_STRUCT;
- PACK_STRUCT_END
- #ifdef PACK_STRUCT_USE_INCLUDES
- # include "arch/epstruct.h"
- #endif
- //读取ICMP首部中字段
- #define ICMPH_TYPE(hdr) ((hdr)->type)
- #define ICMPH_CODE(hdr) ((hdr)->code)
- /** Combines type and code to an u16_t 向ICMP报文首部字段中写入相应值*/
- #define ICMPH_TYPE_SET(hdr, t) ((hdr)->type = (t))
- #define ICMPH_CODE_SET(hdr, c) ((hdr)->code = (c))
- #if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
- void icmp_input(struct pbuf *p, struct netif *inp)ICACHE_FLASH_ATTR;
- void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)ICACHE_FLASH_ATTR;
- void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)ICACHE_FLASH_ATTR;
- #endif /* LWIP_ICMP */
- #ifdef __cplusplus
- }
- #endif
- #endif /* __LWIP_ICMP_H__ */
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