/* Copyright 1984 by the Massachusetts Institute of Technology */ /* Structure definitions for InterNet addresses and packets. * IN packets are viewed as strings of bytes, which are stored in * PDP11 memory in the obvious fashion. Since words are sent high * order byte first in the byte stream, they must be byte swapped * before being treated as word data entities. * The following fields probably need to have their bytes swapped to * be interesting: i_id * The following fields HAVE to have their bytes swapped before using * them in any way: i_len, i_fofflg group. */ /* *------------------------------------------------------------------ * $Source: /mit/cgw/src/gw/in/RCS/in.h,v $ * $Revision: 1.4 $ * $Date: 89/03/15 08:36:39 $ *------------------------------------------------------------------ */ #define inaddr union inadru inaddr { long i_long; /* IN name structure */ struct { unss i_wordh; unss i_wordl; } i_word; struct { byte i_byteh; byte i_byteu; byte i_bytem; byte i_bytel; } i_byte; struct { unsb i_snet; unsb i_ssnet; unsb i_srsd; unsb i_shst; } i_saddr; struct { unsb i_anet; unsb i_ahsth; unsb i_ahstm; unsb i_ahstl; } i_aaddr; struct { unss i_bnet; unsb i_bhsth; unsb i_bhstl; } i_baddr; struct { unss i_cneth; byte i_cnetl; unsb i_chst; } i_caddr; }; #define mkina(x) ((inaddr *) (x)) #define mksina(x) mkunsb(mkina(x)->i_byte.i_byteh), \ (mkina(x)->i_byte.i_byteu), \ (mkina(x)->i_byte.i_bytem), \ mkunsb(mkina(x)->i_byte.i_bytel) #define AMSK 0200 /* Mask values used to decide on which */ #define AVAL 0000 /* class of address we have */ #define BMSK 0300 #define BVAL 0200 #define CMSK 0340 /* The associated macros take an arg */ #define CVAL 0300 /* of the form in_addr.i_aaddr.i_anet */ #define IVAL 0340 /* #define INLNBRD 0xffffffff The VAXen don't yet do this right. */ #define INLNBRD 0x0 /* Local net broadcast address */ /* This should go away soon and be replaced by * the internet broadcast standard. */ #define in_isa(x) (((x) & AMSK) == AVAL) #define in_isb(x) (((x) & BMSK) == BVAL) #define in_isc(x) (((x) & CMSK) == CVAL) #define in_isi(x) (((x) & CMSK) == IVAL) #define CLMSK 0340 /* Alternative method, for case statements */ #define CLSHFT 5 /* Make C generate hyper-optimized case */ #define CLA0 0 /* It takes the same arg; you mask it off, */ #define CLA1 1 /* shift, and then do a case statment with */ #define CLA2 2 /* some code having more than one label. */ #define CLA3 3 /* Values for class A */ #define CLB0 4 #define CLB1 5 /* B */ #define CLC 6 /* C */ #define CLI 7 /* Illegal */ #define inpkt struct inpstr inpkt { byte i_ihlver; /* Inet hdr length and hdr version */ bitb i_tos; /* Type of service */ unss i_len; /* Total packet length */ unss i_id; /* ID (fragmentation, etc) */ unss i_fofflg; /* Fragment offset and flags */ unsb i_ttl; /* Time left to live */ byte i_prot; /* Protocol number */ unss i_cksum; /* Header checksum */ inaddr i_src; /* Source */ inaddr i_dst; /* Destination */ /* byte i_opts[]; /* Not necessarily there */ /* i_opts was removed because zero * length structure elements are not * allowed and since options aren't * used the structure shouldn't be * any bigger. */ }; #define mkin(x) ((inpkt *) (x)) /* Internet Protocol ids */ #define INICMP 1 #define INGGP 3 #define INTCP 6 #define INEGP 8 #define INUDP 17 #define INRVD 66 /* Internet field constants */ #define INTOS 0 /* Type of service */ #define INTTL 255 /* Time to live */ /* Constants; fundamental and defined */ #define INHVERM 0360 /* Mask for version */ #define INHVER 0100 /* Header version 4 - shifted left */ #define INHLENM 017 /* Header length mask */ #define INFOFFM 017777 /* Fragment offset mask */ #define INMFRG 020000 /* More fragments flag */ #define INDNTF 040000 /* Don't fragment flag */ #define INUNUF 0100000 /* Unused flag */ #define INMINH 5 /* Min length of IN header in hdr words */ #define INBPHW 4 /* Number of bytes in INH word */ #define INWPHW 2 /* And words */ #define INMAX 576 /* Max size IN packet must support */ #define INFRGQ 8 /* Fragmentation quantum */ #ifdef BIG_ENDIAN # define INTTLCKA 0x0100 /* Value to adjust cksum by when doing TTL */ #endif #ifdef LITTLE_ENDIAN # define INTTLCKA 01 #endif /* Structure definition for IN address initialization tables. */ #define inia struct inintaddr inia { byte inia_addr[4]; inia *inia_link; byte inia_smask[4]; bits inia_flags; }; #define mkinia(x) ((inia *) (x)) /* Since IP is a big endian protocol, big endian machines don't need * things byte swapped. */ #ifdef BIG_ENDIAN #define ip2s(x) (x) #define s2ip(x) (x) #define l2ip(x) (x) #define ip2l(x) (x) #else #define ip2s(x) swab(x) #define s2ip(x) swab(x) #define l2ip(x) swabl(x) #define ip2l(x) swabl(x) #endif /* Flags for init */ #define IF_RIP 1 /* Set if should send RIP pkts to this address. */ #define IF_RIP_IGN 2 /* Set if should ignore RIP pkts from this * net. If this is set for any address on a * net, then all RIP packets from that net are * ignored. */ #define IF_RIP_PR 4 /* Set if should split horizon with poisoned reverse */ #define IF_PPP_PROXY 8 /* Set if this interface is a point to point interface and there is a host on the other end, not a gateway. We will pretend to be the host and forward all packets to him ... */ /* Definitions for logging */ ext bitf inflg; #define MSGFLG inflg