1 | /*
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2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without modification,
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6 | * are permitted provided that the following conditions are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright notice,
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9 | * this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | * this list of conditions and the following disclaimer in the documentation
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12 | * and/or other materials provided with the distribution.
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13 | * 3. The name of the author may not be used to endorse or promote products
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14 | * derived from this software without specific prior written permission.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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25 | * OF SUCH DAMAGE.
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26 | *
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27 | * This file is part of the lwIP TCP/IP stack.
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28 | *
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29 | * Author: Adam Dunkels <adam@sics.se>
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30 | *
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31 | */
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32 | #ifndef __LWIP_ICMP_H__
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33 | #define __LWIP_ICMP_H__
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34 |
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35 | #include "lwip/opt.h"
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36 | #include "lwip/pbuf.h"
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37 | #include "lwip/ip_addr.h"
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38 | #include "lwip/netif.h"
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39 |
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40 | #ifdef __cplusplus
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41 | extern "C" {
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42 | #endif
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43 |
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44 | #define ICMP_ER 0 /* echo reply */
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45 | #define ICMP_DUR 3 /* destination unreachable */
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46 | #define ICMP_SQ 4 /* source quench */
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47 | #define ICMP_RD 5 /* redirect */
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48 | #define ICMP_ECHO 8 /* echo */
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49 | #define ICMP_TE 11 /* time exceeded */
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50 | #define ICMP_PP 12 /* parameter problem */
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51 | #define ICMP_TS 13 /* timestamp */
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52 | #define ICMP_TSR 14 /* timestamp reply */
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53 | #define ICMP_IRQ 15 /* information request */
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54 | #define ICMP_IR 16 /* information reply */
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55 |
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56 | enum icmp_dur_type {
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57 | ICMP_DUR_NET = 0, /* net unreachable */
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58 | ICMP_DUR_HOST = 1, /* host unreachable */
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59 | ICMP_DUR_PROTO = 2, /* protocol unreachable */
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60 | ICMP_DUR_PORT = 3, /* port unreachable */
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61 | ICMP_DUR_FRAG = 4, /* fragmentation needed and DF set */
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62 | ICMP_DUR_SR = 5 /* source route failed */
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63 | };
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64 |
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65 | enum icmp_te_type {
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66 | ICMP_TE_TTL = 0, /* time to live exceeded in transit */
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67 | ICMP_TE_FRAG = 1 /* fragment reassembly time exceeded */
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68 | };
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69 |
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70 | #ifdef PACK_STRUCT_USE_INCLUDES
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71 | # include "arch/bpstruct.h"
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72 | #endif
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73 | /** This is the standard ICMP header only that the u32_t data
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74 | * is splitted to two u16_t like ICMP echo needs it.
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75 | * This header is also used for other ICMP types that do not
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76 | * use the data part.
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77 | */
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78 | PACK_STRUCT_BEGIN
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79 | struct icmp_echo_hdr {
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80 | PACK_STRUCT_FIELD(u8_t type);
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81 | PACK_STRUCT_FIELD(u8_t code);
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82 | PACK_STRUCT_FIELD(u16_t chksum);
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83 | PACK_STRUCT_FIELD(u16_t id);
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84 | PACK_STRUCT_FIELD(u16_t seqno);
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85 | } PACK_STRUCT_STRUCT;
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86 | PACK_STRUCT_END
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87 | #ifdef PACK_STRUCT_USE_INCLUDES
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88 | # include "arch/epstruct.h"
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89 | #endif
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90 |
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91 | #define ICMPH_TYPE(hdr) ((hdr)->type)
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92 | #define ICMPH_CODE(hdr) ((hdr)->code)
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93 |
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94 | /** Combines type and code to an u16_t */
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95 | #define ICMPH_TYPE_SET(hdr, t) ((hdr)->type = (t))
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96 | #define ICMPH_CODE_SET(hdr, c) ((hdr)->code = (c))
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97 |
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98 |
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99 | #if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
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100 |
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101 | void icmp_input(struct pbuf *p, struct netif *inp);
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102 | void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
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103 | void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);
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104 |
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105 | #endif /* LWIP_ICMP */
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106 |
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107 | #ifdef __cplusplus
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108 | }
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109 | #endif
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110 |
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111 | #endif /* __LWIP_ICMP_H__ */
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