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Annotation of 43BSDTahoe/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)ip_var.h    7.5 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * Overlay for ip header used by other protocols (tcp, udp).
        !            22:  */
        !            23: struct ipovly {
        !            24:        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
        !            25:        u_char  ih_x1;                  /* (unused) */
        !            26:        u_char  ih_pr;                  /* protocol */
        !            27:        short   ih_len;                 /* protocol length */
        !            28:        struct  in_addr ih_src;         /* source internet address */
        !            29:        struct  in_addr ih_dst;         /* destination internet address */
        !            30: };
        !            31: 
        !            32: /*
        !            33:  * Ip reassembly queue structure.  Each fragment
        !            34:  * being reassembled is attached to one of these structures.
        !            35:  * They are timed out after ipq_ttl drops to 0, and may also
        !            36:  * be reclaimed if memory becomes tight.
        !            37:  */
        !            38: struct ipq {
        !            39:        struct  ipq *next,*prev;        /* to other reass headers */
        !            40:        u_char  ipq_ttl;                /* time for reass q to live */
        !            41:        u_char  ipq_p;                  /* protocol of this fragment */
        !            42:        u_short ipq_id;                 /* sequence id for reassembly */
        !            43:        struct  ipasfrag *ipq_next,*ipq_prev;
        !            44:                                        /* to ip headers of fragments */
        !            45:        struct  in_addr ipq_src,ipq_dst;
        !            46: };
        !            47: 
        !            48: /*
        !            49:  * Ip header, when holding a fragment.
        !            50:  *
        !            51:  * Note: ipf_next must be at same offset as ipq_next above
        !            52:  */
        !            53: struct ipasfrag {
        !            54: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            55:        u_char  ip_hl:4,
        !            56:                ip_v:4;
        !            57: #endif
        !            58: #if BYTE_ORDER == BIG_ENDIAN 
        !            59:        u_char  ip_v:4,
        !            60:                ip_hl:4;
        !            61: #endif
        !            62:        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
        !            63:        short   ip_len;
        !            64:        u_short ip_id;
        !            65:        short   ip_off;
        !            66:        u_char  ip_ttl;
        !            67:        u_char  ip_p;
        !            68:        u_short ip_sum;
        !            69:        struct  ipasfrag *ipf_next;     /* next fragment */
        !            70:        struct  ipasfrag *ipf_prev;     /* previous fragment */
        !            71: };
        !            72: 
        !            73: /*
        !            74:  * Structure stored in mbuf in inpcb.ip_options
        !            75:  * and passed to ip_output when ip options are in use.
        !            76:  * The actual length of the options (including ipopt_dst)
        !            77:  * is in m_len.
        !            78:  */
        !            79: #define MAX_IPOPTLEN   40
        !            80: 
        !            81: struct ipoption {
        !            82:        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        !            83:        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
        !            84: };
        !            85: 
        !            86: struct ipstat {
        !            87:        long    ips_total;              /* total packets received */
        !            88:        long    ips_badsum;             /* checksum bad */
        !            89:        long    ips_tooshort;           /* packet too short */
        !            90:        long    ips_toosmall;           /* not enough data */
        !            91:        long    ips_badhlen;            /* ip header length < data size */
        !            92:        long    ips_badlen;             /* ip length < ip header length */
        !            93:        long    ips_fragments;          /* fragments received */
        !            94:        long    ips_fragdropped;        /* frags dropped (dups, out of space) */
        !            95:        long    ips_fragtimeout;        /* fragments timed out */
        !            96:        long    ips_forward;            /* packets forwarded */
        !            97:        long    ips_cantforward;        /* packets rcvd for unreachable dest */
        !            98:        long    ips_redirectsent;       /* packets forwarded on same net */
        !            99: };
        !           100: 
        !           101: #ifdef KERNEL
        !           102: /* flags passed to ip_output as last parameter */
        !           103: #define        IP_FORWARDING           0x1             /* most of ip header exists */
        !           104: #define        IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
        !           105: #define        IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
        !           106: 
        !           107: struct ipstat  ipstat;
        !           108: struct ipq     ipq;                    /* ip reass. queue */
        !           109: u_short        ip_id;                          /* ip packet ctr, for ids */
        !           110: 
        !           111: struct mbuf *ip_srcroute();
        !           112: #endif

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