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Annotation of 42BSD/sys/netinet/ip_var.h, revision 1.1.1.1

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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