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Annotation of Net2/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, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)ip_var.h    7.7 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Overlay for ip header used by other protocols (tcp, udp).
        !            38:  */
        !            39: struct ipovly {
        !            40:        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
        !            41:        u_char  ih_x1;                  /* (unused) */
        !            42:        u_char  ih_pr;                  /* protocol */
        !            43:        short   ih_len;                 /* protocol length */
        !            44:        struct  in_addr ih_src;         /* source internet address */
        !            45:        struct  in_addr ih_dst;         /* destination internet address */
        !            46: };
        !            47: 
        !            48: /*
        !            49:  * Ip reassembly queue structure.  Each fragment
        !            50:  * being reassembled is attached to one of these structures.
        !            51:  * They are timed out after ipq_ttl drops to 0, and may also
        !            52:  * be reclaimed if memory becomes tight.
        !            53:  */
        !            54: struct ipq {
        !            55:        struct  ipq *next,*prev;        /* to other reass headers */
        !            56:        u_char  ipq_ttl;                /* time for reass q to live */
        !            57:        u_char  ipq_p;                  /* protocol of this fragment */
        !            58:        u_short ipq_id;                 /* sequence id for reassembly */
        !            59:        struct  ipasfrag *ipq_next,*ipq_prev;
        !            60:                                        /* to ip headers of fragments */
        !            61:        struct  in_addr ipq_src,ipq_dst;
        !            62: };
        !            63: 
        !            64: /*
        !            65:  * Ip header, when holding a fragment.
        !            66:  *
        !            67:  * Note: ipf_next must be at same offset as ipq_next above
        !            68:  */
        !            69: struct ipasfrag {
        !            70: #if BYTE_ORDER == LITTLE_ENDIAN 
        !            71:        u_char  ip_hl:4,
        !            72:                ip_v:4;
        !            73: #endif
        !            74: #if BYTE_ORDER == BIG_ENDIAN 
        !            75:        u_char  ip_v:4,
        !            76:                ip_hl:4;
        !            77: #endif
        !            78:        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
        !            79:        short   ip_len;
        !            80:        u_short ip_id;
        !            81:        short   ip_off;
        !            82:        u_char  ip_ttl;
        !            83:        u_char  ip_p;
        !            84:        u_short ip_sum;
        !            85:        struct  ipasfrag *ipf_next;     /* next fragment */
        !            86:        struct  ipasfrag *ipf_prev;     /* previous fragment */
        !            87: };
        !            88: 
        !            89: /*
        !            90:  * Structure stored in mbuf in inpcb.ip_options
        !            91:  * and passed to ip_output when ip options are in use.
        !            92:  * The actual length of the options (including ipopt_dst)
        !            93:  * is in m_len.
        !            94:  */
        !            95: #define MAX_IPOPTLEN   40
        !            96: 
        !            97: struct ipoption {
        !            98:        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        !            99:        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
        !           100: };
        !           101: 
        !           102: struct ipstat {
        !           103:        long    ips_total;              /* total packets received */
        !           104:        long    ips_badsum;             /* checksum bad */
        !           105:        long    ips_tooshort;           /* packet too short */
        !           106:        long    ips_toosmall;           /* not enough data */
        !           107:        long    ips_badhlen;            /* ip header length < data size */
        !           108:        long    ips_badlen;             /* ip length < ip header length */
        !           109:        long    ips_fragments;          /* fragments received */
        !           110:        long    ips_fragdropped;        /* frags dropped (dups, out of space) */
        !           111:        long    ips_fragtimeout;        /* fragments timed out */
        !           112:        long    ips_forward;            /* packets forwarded */
        !           113:        long    ips_cantforward;        /* packets rcvd for unreachable dest */
        !           114:        long    ips_redirectsent;       /* packets forwarded on same net */
        !           115:        long    ips_noproto;            /* unknown or unsupported protocol */
        !           116:        long    ips_delivered;          /* packets consumed here */
        !           117:        long    ips_localout;           /* total ip packets generated here */
        !           118:        long    ips_odropped;           /* lost packets due to nobufs, etc. */
        !           119:        long    ips_reassembled;        /* total packets reassembled ok */
        !           120:        long    ips_fragmented;         /* output packets fragmented ok */
        !           121:        long    ips_ofragments;         /* output fragments created */
        !           122:        long    ips_cantfrag;           /* don't fragment flag was set, etc. */
        !           123: };
        !           124: 
        !           125: #ifdef KERNEL
        !           126: /* flags passed to ip_output as last parameter */
        !           127: #define        IP_FORWARDING           0x1             /* most of ip header exists */
        !           128: #define        IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
        !           129: #define        IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
        !           130: 
        !           131: struct ipstat  ipstat;
        !           132: struct ipq     ipq;                    /* ip reass. queue */
        !           133: u_short        ip_id;                          /* ip packet ctr, for ids */
        !           134: 
        !           135: struct mbuf *ip_srcroute();
        !           136: #endif

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