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ip_icmp
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1995-05-23
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#ifndef __netinet_ip_icmp_h
#define __netinet_ip_icmp_h
/* Freenet programmers interface - netinet/ip_icmp.h - 23/5/95 */
#include "sys/types.h"
#include "netinet/ip.h"
#include "netinet/in.h"
#include "netinet/in_systm.h"
/*
* Interface Control Message Protocol Definitions.
* Per RFC 792, September 1981.
*/
/*
* Structure of an icmp header.
*/
struct icmp {
u_char icmp_type; /* type of message, see below */
u_char icmp_code; /* type sub code */
u_short icmp_cksum; /* ones complement cksum of struct */
union {
u_char ih_pptr; /* ICMP_PARAMPROB */
struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
struct ih_idseq {
n_short icd_id;
n_short icd_seq;
} ih_idseq;
int ih_void;
/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
struct ih_pmtu {
n_short ipm_void;
n_short ipm_nextmtu;
} ih_pmtu;
} icmp_hun;
#define icmp_pptr icmp_hun.ih_pptr
#define icmp_gwaddr icmp_hun.ih_gwaddr
#define icmp_id icmp_hun.ih_idseq.icd_id
#define icmp_seq icmp_hun.ih_idseq.icd_seq
#define icmp_void icmp_hun.ih_void
#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
union {
struct id_ts {
n_time its_otime;
n_time its_rtime;
n_time its_ttime;
} id_ts;
struct id_ip {
struct ip idi_ip;
/* options and then 64 bits of data */
} id_ip;
u_long id_mask;
char id_data[1];
} icmp_dun;
#define icmp_otime icmp_dun.id_ts.its_otime
#define icmp_rtime icmp_dun.id_ts.its_rtime
#define icmp_ttime icmp_dun.id_ts.its_ttime
#define icmp_ip icmp_dun.id_ip.idi_ip
#define icmp_mask icmp_dun.id_mask
#define icmp_data icmp_dun.id_data
};
/*
* Minimum ICMP packet size
*/
#define ICMP_MINLEN 8
#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
#define ICMP_MASKLEN 12 /* address mask */
#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
/*
* Values for type and code fields
*/
#define ICMP_ECHOREPLY 0 /* Echo reply */
#define ICMP_UNREACH 3 /* Destination unreachable */
#define ICMP_UNREACH_NET 0 /* Bad net */
#define ICMP_UNREACH_HOST 1 /* Bad host */
#define ICMP_UNREACH_PROTOCOL 2 /* Bad protocol */
#define ICMP_UNREACH_PORT 3 /* Bad port */
#define ICMP_UNREACH_NEEDFRAG 4 /* Fragmentation needed */
#define ICMP_UNREACH_SRCFAIL 5 /* Source route failed */
#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
#define ICMP_SOURCEQUENCH 4 /* Source quench */
#define ICMP_REDIRECT 5 /* Redirection advice */
#define ICMP_REDIRECT_NET 0 /* For network */
#define ICMP_REDIRECT_HOST 1 /* For host */
#define ICMP_REDIRECT_TOSNET 2 /* For network and TOS */
#define ICMP_REDIRECT_TOSHOST 3 /* For host and TOS */
#define ICMP_ECHO 8 /* Echo request */
#define ICMP_ROUTERADVERT 9 /* router advertisement */
#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
#define ICMP_TIMXCEED 11 /* Time exceeded */
#define ICMP_TIMXCEED_INTRANS 0 /* TTL exceeded */
#define ICMP_TIMXCEED_REASS 1 /* Reassembly timed out */
#define ICMP_PARAMPROB 12 /* Parameter problem */
#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
#define ICMP_TSTAMP 13 /* Timestamp request */
#define ICMP_TSTAMPREPLY 14 /* Timestamp reply */
#define ICMP_IREQ 15 /* Information request */
#define ICMP_IREQREPLY 16 /* Information reply */
#define ICMP_MASKREQ 17 /* Address mask request */
#define ICMP_MASKREPLY 18 /* Address mask reply */
#define ICMP_MAXTYPE 18
#define ICMP_INFOTYPE(type) \
((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
#endif