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- /* 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 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 */
- };
-
- /* In ICMP */
- void icmp_input(struct mbuf *, char, int32, int32, char, int16, char);
- int icmp_output(struct ip *, struct mbuf *, char, char, union icmp_args *);
- struct mbuf *htonicmp(struct icmp *, struct mbuf *);
- int ntohicmp(struct icmp *, struct mbuf **);
-
- /* In ICMPCMD */
- void start_ping(void);
- void ptimeout(char *);
- void echo_proc(int32, int32, struct icmp *, struct mbuf *);
-
- /* ICMP messages, decoded */
- extern char *icmptypes[],*unreach[],*exceed[],*redirect[];
-