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Annotation of 42BSD/sys/netinet/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:        struct  in_addr ih_src;         /* source internet address */
        !            12:        struct  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:        struct  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:        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
        !            42:        short   ip_len;
        !            43:        u_short ip_id;
        !            44:        short   ip_off;
        !            45:        u_char  ip_ttl;
        !            46:        u_char  ip_p;
        !            47:        u_short ip_sum;
        !            48:        struct  ipasfrag *ipf_next;     /* next fragment */
        !            49:        struct  ipasfrag *ipf_prev;     /* previous fragment */
        !            50: };
        !            51: 
        !            52: struct ipstat {
        !            53:        int     ips_badsum;             /* checksum bad */
        !            54:        int     ips_tooshort;           /* packet too short */
        !            55:        int     ips_toosmall;           /* not enough data */
        !            56:        int     ips_badhlen;            /* ip header length < data size */
        !            57:        int     ips_badlen;             /* ip length < ip header length */
        !            58: };
        !            59: 
        !            60: #ifdef KERNEL
        !            61: /* flags passed to ip_output as last parameter */
        !            62: #define        IP_FORWARDING           0x1     /* most of ip header exists */
        !            63: #define        IP_ROUTETOIF            0x10    /* same as SO_DONTROUTE */
        !            64: #define        IP_ALLOWBROADCAST       SS_PRIV /* can send broadcast packets */
        !            65: 
        !            66: struct ipstat  ipstat;
        !            67: struct ipq     ipq;                    /* ip reass. queue */
        !            68: u_short        ip_id;                          /* ip packet ctr, for ids */
        !            69: #endif

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