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Annotation of researchv9/sys/h/inet/ip_var.h, revision 1.1

1.1     ! root        1: /*     ip_var.h        6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Overlay for ip header used by other protocols (tcp, udp).
        !             5:  */
        !             6: struct ipovly {
        !             7:        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
        !             8:        u_char  ih_x1;                  /* (unused) */
        !             9:        u_char  ih_pr;                  /* protocol */
        !            10:        short   ih_len;                 /* protocol length */
        !            11:        in_addr ih_src;         /* source internet address */
        !            12:        in_addr ih_dst;         /* destination internet address */
        !            13: };
        !            14: 
        !            15: /*
        !            16:  * Ip reassembly queue structure.  Each fragment
        !            17:  * being reassembled is attached to one of these structures.
        !            18:  * They are timed out after ipq_ttl drops to 0, and may also
        !            19:  * be reclaimed if memory becomes tight.
        !            20:  */
        !            21: struct ipq {
        !            22:        struct  ipq *next,*prev;        /* to other reass headers */
        !            23:        u_char  ipq_ttl;                /* time for reass q to live */
        !            24:        u_char  ipq_p;                  /* protocol of this fragment */
        !            25:        u_short ipq_id;                 /* sequence id for reassembly */
        !            26:        struct  ipasfrag *ipq_next,*ipq_prev;
        !            27:                                        /* to ip headers of fragments */
        !            28:        in_addr ipq_src,ipq_dst;
        !            29: };
        !            30: 
        !            31: /*
        !            32:  * Ip header, when holding a fragment.
        !            33:  *
        !            34:  * Note: ipf_next must be at same offset as ipq_next above
        !            35:  */
        !            36: struct ipasfrag {
        !            37: #ifdef vax
        !            38:        u_char  ip_hl:4,
        !            39:                ip_v:4;
        !            40: #endif
        !            41: #ifdef mc68000
        !            42:        u_char  ip_v:4,
        !            43:                ip_hl:4;
        !            44: #endif
        !            45:        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
        !            46:        short   ip_len;
        !            47:        u_short ip_id;
        !            48:        short   ip_off;
        !            49:        u_char  ip_ttl;
        !            50:        u_char  ip_p;
        !            51:        u_short ip_sum;
        !            52:        struct  ipasfrag *ipf_next;     /* next fragment */
        !            53:        struct  ipasfrag *ipf_prev;     /* previous fragment */
        !            54: };
        !            55: 
        !            56: struct ipstat {
        !            57:        int     ips_badsum;             /* checksum bad */
        !            58:        int     ips_tooshort;           /* packet too short */
        !            59:        int     ips_toosmall;           /* not enough data */
        !            60:        int     ips_badhlen;            /* ip header length < data size */
        !            61:        int     ips_badlen;             /* ip length < ip header length */
        !            62:        int     ips_qfull;
        !            63:        int     ips_route;              /* routing output errors */
        !            64:        int     ips_fragout;            /* fragmented packets */
        !            65: };
        !            66: 
        !            67: /* flags passed to ip_output as last parameter */
        !            68: #define        IP_FORWARDING           0x1     /* most of ip header exists */
        !            69: #define        IP_ROUTETOIF            0x10    /* same as SO_DONTROUTE */
        !            70: 
        !            71: #ifdef KERNEL
        !            72: struct ipstat  ipstat;
        !            73: struct ipq     ipq;                    /* ip reass. queue */
        !            74: u_short        ip_id;                          /* ip packet ctr, for ids */
        !            75: #endif
        !            76: 
        !            77: /*
        !            78:  * interface stuff
        !            79:  */
        !            80: struct ipif{
        !            81:        struct queue *queue;
        !            82:        int flags;
        !            83:        int mtu;
        !            84:        in_addr thishost;
        !            85:        in_addr that;
        !            86:        in_addr mask;
        !            87:        int ipackets, ierrors;
        !            88:        int opackets, oerrors;
        !            89:        int arp;
        !            90:        int dev;
        !            91: };
        !            92: #define IFF_UP         0x1
        !            93: #define IFF_HOST       0x2
        !            94: #define IFF_ARP                0x4
        !            95: 
        !            96: #ifdef KERNEL
        !            97: extern struct ipif ipif[];
        !            98: extern struct ipif *ip_ifwithaddr(), *ip_ifonnetof();
        !            99: #endif
        !           100: 
        !           101: #define IPIOHOST       (('i'<<8)|1)
        !           102: #define IPIONET                (('i'<<8)|2)
        !           103: #define IPIOLOCAL      (('i'<<8)|3)
        !           104: #define IPIOARP                (('i'<<8)|4)
        !           105: #define IPIORESOLVE    (('i'<<8)|5)
        !           106: #define IPIOMTU                (('i'<<8)|6)
        !           107: #define IPIOROUTE      (('i'<<8)|7)
        !           108: #define IPIOGETIFS     (('i'<<8)|8)
        !           109: 
        !           110: #define IP_BODY_LIMIT 8192
        !           111: #define IP_MSG_LIMIT (sizeof(struct ipovly) + IP_BODY_LIMIT)
        !           112: 
        !           113: /* an ip routing record */
        !           114: struct ip_route{
        !           115:        long time;              /* time of last access */
        !           116:        in_addr dst;            /* destination */
        !           117:        in_addr gate;           /* gate to use for this destination */
        !           118: };
        !           119: 
        !           120: #ifdef KERNEL
        !           121: /* structure returned by "ip_route" */
        !           122: struct ip_route_info {
        !           123:        in_addr addr;
        !           124:        struct ipif *ifp;
        !           125: };
        !           126: struct ip_route_info ip_route();
        !           127: #endif KERNEL
        !           128: 
        !           129: /* an ip to ethernet address mapping */
        !           130: struct ip_arp{
        !           131:        long time;                      /* time of last access */
        !           132:        in_addr inaddr;                 /* inet address */
        !           133:        unsigned char enaddr[6];        /* ethernet address */
        !           134: };

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