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Annotation of 43BSD/sys/netinet/ip_var.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)ip_var.h    7.1 (Berkeley) 6/5/86
                      7:  */
                      8: 
                      9: /*
                     10:  * Overlay for ip header used by other protocols (tcp, udp).
                     11:  */
                     12: struct ipovly {
                     13:        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
                     14:        u_char  ih_x1;                  /* (unused) */
                     15:        u_char  ih_pr;                  /* protocol */
                     16:        short   ih_len;                 /* protocol length */
                     17:        struct  in_addr ih_src;         /* source internet address */
                     18:        struct  in_addr ih_dst;         /* destination internet address */
                     19: };
                     20: 
                     21: /*
                     22:  * Ip reassembly queue structure.  Each fragment
                     23:  * being reassembled is attached to one of these structures.
                     24:  * They are timed out after ipq_ttl drops to 0, and may also
                     25:  * be reclaimed if memory becomes tight.
                     26:  */
                     27: struct ipq {
                     28:        struct  ipq *next,*prev;        /* to other reass headers */
                     29:        u_char  ipq_ttl;                /* time for reass q to live */
                     30:        u_char  ipq_p;                  /* protocol of this fragment */
                     31:        u_short ipq_id;                 /* sequence id for reassembly */
                     32:        struct  ipasfrag *ipq_next,*ipq_prev;
                     33:                                        /* to ip headers of fragments */
                     34:        struct  in_addr ipq_src,ipq_dst;
                     35: };
                     36: 
                     37: /*
                     38:  * Ip header, when holding a fragment.
                     39:  *
                     40:  * Note: ipf_next must be at same offset as ipq_next above
                     41:  */
                     42: struct ipasfrag {
                     43: #ifdef vax
                     44:        u_char  ip_hl:4,
                     45:                ip_v:4;
                     46: #endif
                     47:        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
                     48:        short   ip_len;
                     49:        u_short ip_id;
                     50:        short   ip_off;
                     51:        u_char  ip_ttl;
                     52:        u_char  ip_p;
                     53:        u_short ip_sum;
                     54:        struct  ipasfrag *ipf_next;     /* next fragment */
                     55:        struct  ipasfrag *ipf_prev;     /* previous fragment */
                     56: };
                     57: 
                     58: /*
                     59:  * Structure stored in mbuf in inpcb.ip_options
                     60:  * and passed to ip_output when ip options are in use.
                     61:  * The actual length of the options (including ipopt_dst)
                     62:  * is in m_len.
                     63:  */
                     64: #define MAX_IPOPTLEN   40
                     65: 
                     66: struct ipoption {
                     67:        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
                     68:        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
                     69: };
                     70: 
                     71: struct ipstat {
                     72:        long    ips_total;              /* total packets received */
                     73:        long    ips_badsum;             /* checksum bad */
                     74:        long    ips_tooshort;           /* packet too short */
                     75:        long    ips_toosmall;           /* not enough data */
                     76:        long    ips_badhlen;            /* ip header length < data size */
                     77:        long    ips_badlen;             /* ip length < ip header length */
                     78:        long    ips_fragments;          /* fragments received */
                     79:        long    ips_fragdropped;        /* frags dropped (dups, out of space) */
                     80:        long    ips_fragtimeout;        /* fragments timed out */
                     81:        long    ips_forward;            /* packets forwarded */
                     82:        long    ips_cantforward;        /* packets rcvd for unreachable dest */
                     83:        long    ips_redirectsent;       /* packets forwarded on same net */
                     84: };
                     85: 
                     86: #ifdef KERNEL
                     87: /* flags passed to ip_output as last parameter */
                     88: #define        IP_FORWARDING           0x1             /* most of ip header exists */
                     89: #define        IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
                     90: #define        IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
                     91: 
                     92: struct ipstat  ipstat;
                     93: struct ipq     ipq;                    /* ip reass. queue */
                     94: u_short        ip_id;                          /* ip packet ctr, for ids */
                     95: 
                     96: struct mbuf *ip_srcroute();
                     97: #endif

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