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ICMP.H
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1990-06-06
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66 lines
/* Internet Control Message Protocol */
/* Message types */
#define ECHO_REPLY 0 /* Echo Reply */
#define DEST_UNREACH 3 /* Destination Unreachable */
#define QUENCH 4 /* Source Quench */
#define REDIRECT 5 /* Redirect */
#define ECHO_REQ 8 /* Echo Request */
#define TIME_EXCEED 11 /* Time-to-live Exceeded */
#define PARAM_PROB 12 /* Parameter Problem */
#define TIMESTAMP 13 /* Timestamp */
#define TIME_REPLY 14 /* Timestamp Reply */
#define INFO_RQST 15 /* Information Request */
#define INFO_REPLY 16 /* Information Reply */
/* Internal format of an ICMP header (checksum is missing) */
struct icmp {
char type;
char code;
union icmp_args {
int32 unused;
unsigned char pointer;
int32 address;
struct {
int16 id;
int16 seq;
} echo;
} args;
};
#define ICMPLEN 8 /* Length of ICMP header on the net */
#define NULLICMP (union icmp_args *)0
/* Destination Unreachable codes */
#define NET_UNREACH 0 /* Net unreachable */
#define HOST_UNREACH 1 /* Host unreachable */
#define PROT_UNREACH 2 /* Protocol unreachable */
#define PORT_UNREACH 3 /* Port unreachable */
#define FRAG_NEEDED 4 /* Fragmentation needed and DF set */
#define ROUTE_FAIL 5 /* Source route failed */
/* Time Exceeded codes */
#define TTL_EXCEED 0 /* Time-to-live exceeded */
#define FRAG_EXCEED 1 /* Fragment reassembly time exceeded */
/* Redirect message codes */
#define REDR_NET 0 /* Redirect for the network */
#define REDR_HOST 1 /* Redirect for the host */
#define REDR_TOS 2 /* Redirect for Type of Service, or-ed with prev */
struct icmp_errors {
unsigned checksum; /* ICMP Checksum errors */
unsigned nospace; /* alloc_mbuf failed someplace */
unsigned noloop; /* No ICMP in response to an ICMP */
unsigned bdcsts; /* Ignore broadcast ICMPs */
};
#define ICMP_TYPES 17
struct icmp_stats {
unsigned input[ICMP_TYPES]; /* ICMP input stats by type */
unsigned output[ICMP_TYPES]; /* ICMP output stats by type */
};
void icmp_dump();
/* ICMP messages, decoded */
extern char *icmptypes[],*unreach[],*exceed[],*redirect[];
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