FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_var.h

     /*
      * Copyright (c) 1982, 1986, 1993
      *      The 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.
     *
     *      @(#)ip_var.h    8.2 (Berkeley) 1/9/95
     * $FreeBSD: src/sys/netinet/ip_var.h,v 1.24.2.6 1999/09/05 08:18:36 peter Exp $
     */
    
    #ifndef _NETINET_IP_VAR_H_
    #define _NETINET_IP_VAR_H_
    
    /*
     * 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 */
            u_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;
    #ifdef IPDIVERT
            u_short ipq_divert;             /* divert protocol port */
    #ifdef IPFW_DIVERT_RESTART
            u_short ipq_div_cookie;         /* divert protocol cookie */
    #endif /* IPFW_DIVERT_RESTART */
    #endif
    };
    
    /*
     * 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;                /* XXX overlays ip_tos: use low bit
                                             * to avoid destroying tos;
                                             * copied from (ip_off&IP_MF) */
            u_short ip_len;
            u_short ip_id;
            u_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 */
   };
   
   /*
    * Structure attached to inpcb.ip_moptions and
    * passed to ip_output when IP multicast options are in use.
    */
   struct ip_moptions {
           struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
           u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
           u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
           u_short imo_num_memberships;    /* no. memberships this socket */
           struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
           u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
   };
   
   struct  ipstat {
           u_long  ips_total;              /* total packets received */
           u_long  ips_badsum;             /* checksum bad */
           u_long  ips_tooshort;           /* packet too short */
           u_long  ips_toosmall;           /* not enough data */
           u_long  ips_badhlen;            /* ip header length < data size */
           u_long  ips_badlen;             /* ip length < ip header length */
           u_long  ips_fragments;          /* fragments received */
           u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
           u_long  ips_fragtimeout;        /* fragments timed out */
           u_long  ips_forward;            /* packets forwarded */
           u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
           u_long  ips_redirectsent;       /* packets forwarded on same net */
           u_long  ips_noproto;            /* unknown or unsupported protocol */
           u_long  ips_delivered;          /* datagrams delivered to upper level*/
           u_long  ips_localout;           /* total ip packets generated here */
           u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
           u_long  ips_reassembled;        /* total packets reassembled ok */
           u_long  ips_fragmented;         /* datagrams successfully fragmented */
           u_long  ips_ofragments;         /* output fragments created */
           u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
           u_long  ips_badoptions;         /* error in option processing */
           u_long  ips_noroute;            /* packets discarded due to no route */
           u_long  ips_badvers;            /* ip version != 4 */
           u_long  ips_rawout;             /* total raw ip packets generated */
           u_long  ips_toolong;            /* ip length > max ip packet size */
   };
   
   #ifdef KERNEL
   /* flags passed to ip_output as last parameter */
   #define IP_FORWARDING           0x1             /* most of ip header exists */
   #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
   #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
   #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
   
   struct inpcb;
   struct route;
   
   extern struct   ipstat  ipstat;
   extern u_short  ip_id;                          /* ip packet ctr, for ids */
   extern int      ip_defttl;                      /* default IP ttl */
   extern u_char   ip_protox[];
   extern struct socket *ip_rsvpd; /* reservation protocol daemon */
   extern struct socket *ip_mrouter; /* multicast routing daemon */
   extern int      (*legal_vif_num) __P((int));
   extern u_long   (*ip_mcast_src) __P((int));
   extern int rsvp_on;
   
   int      ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
   void     ip_drain __P((void));
   void     ip_freemoptions __P((struct ip_moptions *));
   void     ip_init __P((void));
   extern int       (*ip_mforward) __P((struct ip *, struct ifnet *, struct mbuf *,
                             struct ip_moptions *));
   int      ip_output __P((struct mbuf *,
               struct mbuf *, struct route *, int, struct ip_moptions *));
   void     ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *,
                   struct mbuf *));
   void     ip_slowtimo __P((void));
   struct mbuf *
            ip_srcroute __P((void));
   void     ip_stripoptions __P((struct mbuf *, struct mbuf *));
   int      rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
   void     rip_init __P((void));
   void     rip_input __P((struct mbuf *, int));
   int      rip_output __P((struct mbuf *, struct socket *, u_long));
   int      rip_usrreq __P((struct socket *,
               int, struct mbuf *, struct mbuf *, struct mbuf *));
   void    ipip_input __P((struct mbuf *, int));
   void    rsvp_input __P((struct mbuf *, int));
   int     ip_rsvp_init __P((struct socket *));
   int     ip_rsvp_done __P((void));
   int     ip_rsvp_vif_init __P((struct socket *, struct mbuf *));
   int     ip_rsvp_vif_done __P((struct socket *, struct mbuf *));
   void    ip_rsvp_force_done __P((struct socket *));
   
   #ifdef IPDIVERT
   void    div_init __P((void));
   void    div_input __P((struct mbuf *, int));
   int     div_usrreq __P((struct socket *,
                   int, struct mbuf *, struct mbuf *, struct mbuf *));
   extern u_short ip_divert_port;
   extern u_short ip_divert_cookie;
   #endif /* IPDIVERT */
   
   #endif /* KERNEL */
   
   #endif /* _NETINET_IP_VAR_H_ */

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