sys/netinet/ip_var.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: @(#)ip_var.h      7.7 (Berkeley) 6/28/90
 *      $Id$
 */

/*
 * Overlay for ip header used by other protocols (tcp, udp).
 */
struct ipovly {
        caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
        u_char  ih_x1;                  /* (unused) */
        u_char  ih_pr;                  /* protocol */
        short   ih_len;                 /* protocol length */
        struct  in_addr ih_src;         /* source internet address */
        struct  in_addr ih_dst;         /* destination internet address */
};

/*
 * Ip reassembly queue structure.  Each fragment
 * being reassembled is attached to one of these structures.
 * They are timed out after ipq_ttl drops to 0, and may also
 * be reclaimed if memory becomes tight.
 */
struct ipq {
        struct  ipq *next,*prev;        /* to other reass headers */
        u_char  ipq_ttl;                /* time for reass q to live */
        u_char  ipq_p;                  /* protocol of this fragment */
        u_short ipq_id;                 /* sequence id for reassembly */
        struct  ipasfrag *ipq_next,*ipq_prev;
                                        /* to ip headers of fragments */
        struct  in_addr ipq_src,ipq_dst;
};

/*
 * Ip header, when holding a fragment.
 *
 * Note: ipf_next must be at same offset as ipq_next above
 */
struct  ipasfrag {
#if BYTE_ORDER == LITTLE_ENDIAN
        u_char  ip_hl:4,
                ip_v:4;
#endif
#if BYTE_ORDER == BIG_ENDIAN
        u_char  ip_v:4,
                ip_hl:4;
#endif
        u_char  ipf_mff;                /* copied from (ip_off&IP_MF) */
        short   ip_len;
        u_short ip_id;
        short   ip_off;
        u_char  ip_ttl;
        u_char  ip_p;
        u_short ip_sum;
        struct  ipasfrag *ipf_next;     /* next fragment */
        struct  ipasfrag *ipf_prev;     /* previous fragment */
};

/*
 * Structure stored in mbuf in inpcb.ip_options
 * and passed to ip_output when ip options are in use.
 * The actual length of the options (including ipopt_dst)
 * is in m_len.
 */
#define MAX_IPOPTLEN    40

struct ipoption {
        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
};

struct  ipstat {
        long    ips_total;              /* total packets received */
        long    ips_badsum;             /* checksum bad */
        long    ips_tooshort;           /* packet too short */
        long    ips_toosmall;           /* not enough data */
        long    ips_badhlen;            /* ip header length < data size */
        long    ips_badlen;             /* ip length < ip header length */
        long    ips_fragments;          /* fragments received */
        long    ips_fragdropped;        /* frags dropped (dups, out of space) */
        long    ips_fragtimeout;        /* fragments timed out */
        long    ips_forward;            /* packets forwarded */
        long    ips_cantforward;        /* packets rcvd for unreachable dest */
        long    ips_redirectsent;       /* packets forwarded on same net */
        long    ips_noproto;            /* unknown or unsupported protocol */
        long    ips_delivered;          /* packets consumed here */
        long    ips_localout;           /* total ip packets generated here */
        long    ips_odropped;           /* lost packets due to nobufs, etc. */
        long    ips_reassembled;        /* total packets reassembled ok */
        long    ips_fragmented;         /* output packets fragmented ok */
        long    ips_ofragments;         /* output fragments created */
        long    ips_cantfrag;           /* don't fragment flag was set, etc. */
};

#ifdef KERNEL
/* flags passed to ip_output as last parameter */
#define IP_FORWARDING           0x1             /* most of ip header exists */
#define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
#define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */

struct  ipstat  ipstat;
struct  ipq     ipq;                    /* ip reass. queue */
u_short ip_id;                          /* ip packet ctr, for ids */

struct  mbuf *ip_srcroute();
#endif