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| Commit | Line | Data |
|---|---|---|
| 2b4b57cd | 1 | /* ip_icmp.h 4.2 81/11/18 */ |
| 9fc9afc2 BJ |
2 | |
| 3 | /* | |
| 4 | * Interface Control Message Protocol Definitions. | |
| 5 | * Per RFC 792, September 1981. | |
| 6 | */ | |
| 7 | ||
| 8 | /* | |
| 9 | * Structure of an icmp header. | |
| 10 | */ | |
| 11 | struct icmp { | |
| 12 | u_char icmp_type; /* type of message, see below */ | |
| 13 | u_char icmp_code; /* type sub code */ | |
| 14 | u_short icmp_cksum; /* ones complement cksum of struct */ | |
| 15 | union { | |
| 16 | u_char ih_pptr; /* ICMP_PARAMPROB */ | |
| 2b4b57cd | 17 | struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ |
| 9fc9afc2 BJ |
18 | struct ih_idseq { |
| 19 | n_short icd_id; | |
| 20 | n_short icd_seq; | |
| 21 | } ih_idseq; | |
| 22 | } icmp_hun; | |
| 23 | #define icmp_pptr icmp_hun.ih_pptr | |
| 24 | #define icmp_gwaddr icmp_hun.ih_gwaddr | |
| 25 | #define icmp_id icmp_hun.ih_idseq.icd_id | |
| 26 | #define icmp_seq icmp_hun.ih_idseq.icd_seq | |
| 27 | union { | |
| 28 | struct id_ts { | |
| 29 | n_time its_otime; | |
| 30 | n_time its_rtime; | |
| 31 | n_time its_ttime; | |
| 32 | } id_ts; | |
| 33 | struct id_ip { | |
| 34 | struct ip idi_ip; | |
| 35 | /* options and then 64 bits of data */ | |
| 36 | } id_ip; | |
| 37 | } icmp_dun; | |
| 38 | #define icmp_otime icmp_dun.id_ts.its_otime | |
| 39 | #define icmp_rtime icmp_dun.id_ts.its_rtime | |
| 40 | #define icmp_ttime icmp_dun.id_ts.its_ttime | |
| 41 | #define icmp_ip icmp_dun.id_ip.idi_ip | |
| 42 | }; | |
| 43 | ||
| 44 | /* | |
| 45 | * Lower bounds on packet lengths for various types. | |
| 46 | * For the error advice packets must first insure that the | |
| 47 | * packet is large enought to contain the returned ip header. | |
| 48 | * Only then can we do the check to see if 64 bits of packet | |
| 49 | * data have been returned, since we need to check the returned | |
| 50 | * ip header length. | |
| 51 | */ | |
| 52 | #define ICMP_MINLEN 8 /* abs minimum */ | |
| 53 | #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ | |
| 54 | #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ | |
| 55 | #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_len << 2) + 8) | |
| 56 | /* N.B.: must separately check that ip_hl >= 5 */ | |
| 57 | ||
| 58 | /* | |
| 59 | * Definition of type and code field values. | |
| 60 | */ | |
| 61 | #define ICMP_ECHOREPLY 0 /* echo reply */ | |
| 62 | #define ICMP_UNREACH 3 /* dest unreachable, codes: */ | |
| 63 | #define ICMP_UNREACH_NET 0 /* bad net */ | |
| 64 | #define ICMP_UNREACH_HOST 1 /* bad host */ | |
| 65 | #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ | |
| 66 | #define ICMP_UNREACH_PORT 3 /* bad port */ | |
| 67 | #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ | |
| 68 | #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ | |
| 69 | #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ | |
| 70 | #define ICMP_REDIRECT 5 /* shorter route, codes: */ | |
| 71 | #define ICMP_REDIRECT_NET 0 /* for network */ | |
| 72 | #define ICMP_REDIRECT_HOST 1 /* for host */ | |
| 73 | #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ | |
| 74 | #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ | |
| 75 | #define ICMP_ECHO 8 /* echo service */ | |
| 76 | #define ICMP_TIMXCEED 11 /* time exceeded, code: */ | |
| 77 | #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ | |
| 78 | #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ | |
| 79 | #define ICMP_TSTAMP 13 /* timestamp request */ | |
| 80 | #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ | |
| 81 | #define ICMP_IREQ 15 /* information request */ | |
| 82 | #define ICMP_IREQREPLY 16 /* information reply */ | |
| 83 | #define ICMP_PARAMPROB 12 /* ip header bad */ |