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