The Tcpdump Group git mirrors - tcpdump/blob - linux-include/netinet/ip_var.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  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    8.2 (Berkeley) 1/9/95
  34  */
  35
  36 #include <endian.h>
  37
  38 /*
  39  * Overlay for ip header used by other protocols (tcp, udp).
  40  */
  41 struct ipovly {
  42         caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
  43         u_char  ih_x1;                  /* (unused) */
  44         u_char  ih_pr;                  /* protocol */
  45         short   ih_len;                 /* protocol length */
  46         struct  in_addr ih_src;         /* source internet address */
  47         struct  in_addr ih_dst;         /* destination internet address */
  48 } __attribute__ ((packed));
  49
  50 /*
  51  * Ip reassembly queue structure.  Each fragment
  52  * being reassembled is attached to one of these structures.
  53  * They are timed out after ipq_ttl drops to 0, and may also
  54  * be reclaimed if memory becomes tight.
  55  */
  56 struct ipq {
  57         struct  ipq *next,*prev;        /* to other reass headers */
  58         u_char  ipq_ttl;                /* time for reass q to live */
  59         u_char  ipq_p;                  /* protocol of this fragment */
  60         u_short ipq_id;                 /* sequence id for reassembly */
  61         struct  ipasfrag *ipq_next,*ipq_prev;
  62                                         /* to ip headers of fragments */
  63         struct  in_addr ipq_src,ipq_dst;
  64 } __attribute__ ((packed));
  65
  66 /*
  67  * Ip header, when holding a fragment.
  68  *
  69  * Note: ipf_next must be at same offset as ipq_next above
  70  */
  71 struct  ipasfrag {
  72 #if BYTE_ORDER == LITTLE_ENDIAN
  73         u_char  ip_hl:4,
  74                 ip_v:4;
  75 #endif
  76 #if BYTE_ORDER == BIG_ENDIAN
  77         u_char  ip_v:4,
  78                 ip_hl:4;
  79 #endif
  80         u_char  ipf_mff;                /* XXX overlays ip_tos: use low bit
  81                                          * to avoid destroying tos;
  82                                          * copied from (ip_off&IP_MF) */
  83         short   ip_len;
  84         u_short ip_id;
  85         short   ip_off;
  86         u_char  ip_ttl;
  87         u_char  ip_p;
  88         u_short ip_sum;
  89         struct  ipasfrag *ipf_next;     /* next fragment */
  90         struct  ipasfrag *ipf_prev;     /* previous fragment */
  91 } __attribute__ ((packed));
  92
  93 /*
  94  * Structure stored in mbuf in inpcb.ip_options
  95  * and passed to ip_output when ip options are in use.
  96  * The actual length of the options (including ipopt_dst)
  97  * is in m_len.
  98  */
  99 #define MAX_IPOPTLEN    40
 100
 101 struct ipoption {
 102         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
 103         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
 104 };
 105
 106 struct  ipstat {
 107         n_long  ips_total;              /* total packets received */
 108         n_long  ips_badsum;             /* checksum bad */
 109         n_long  ips_tooshort;           /* packet too short */
 110         n_long  ips_toosmall;           /* not enough data */
 111         n_long  ips_badhlen;            /* ip header length < data size */
 112         n_long  ips_badlen;             /* ip length < ip header length */
 113         n_long  ips_fragments;          /* fragments received */
 114         n_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
 115         n_long  ips_fragtimeout;        /* fragments timed out */
 116         n_long  ips_forward;            /* packets forwarded */
 117         n_long  ips_cantforward;        /* packets rcvd for unreachable dest */
 118         n_long  ips_redirectsent;       /* packets forwarded on same net */
 119         n_long  ips_noproto;            /* unknown or unsupported protocol */
 120         n_long  ips_delivered;          /* datagrams delivered to upper level*/
 121         n_long  ips_localout;           /* total ip packets generated here */
 122         n_long  ips_odropped;           /* lost packets due to nobufs, etc. */
 123         n_long  ips_reassembled;        /* total packets reassembled ok */
 124         n_long  ips_fragmented;         /* datagrams sucessfully fragmented */
 125         n_long  ips_ofragments;         /* output fragments created */
 126         n_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
 127         n_long  ips_badoptions;         /* error in option processing */
 128         n_long  ips_noroute;            /* packets discarded due to no route */
 129         n_long  ips_badvers;            /* ip version != 4 */
 130         n_long  ips_rawout;             /* total raw ip packets generated */
 131 };
 132
 133 #ifdef KERNEL
 134 /* flags passed to ip_output as last parameter */
 135 #define IP_FORWARDING           0x1             /* most of ip header exists */
 136 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
 137 #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
 138 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
 139
 140 struct  ipstat  ipstat;
 141 struct  ipq     ipq;                    /* ip reass. queue */
 142 u_short ip_id;                          /* ip packet ctr, for ids */
 143 int     ip_defttl;                      /* default IP ttl */
 144
 145 int      in_control (struct socket *, n_long, caddr_t, struct ifnet *);
 146 int      ip_ctloutput (int, struct socket *, int, int, struct mbuf **);
 147 void     ip_deq (struct ipasfrag *);
 148 int      ip_dooptions (struct mbuf *);
 149 void     ip_drain (void);
 150 void     ip_enq (struct ipasfrag *, struct ipasfrag *);
 151 void     ip_forward (struct mbuf *, int);
 152 void     ip_freef (struct ipq *);
 153 void     ip_freemoptions (struct ip_moptions *);
 154 int      ip_getmoptions (int, struct ip_moptions *, struct mbuf **);
 155 void     ip_init (void);
 156 int      ip_mforward (struct mbuf *, struct ifnet *);
 157 int      ip_optcopy (struct ip *, struct ip *);
 158 int      ip_output (struct mbuf *,
 159             struct mbuf *, struct route *, int, struct ip_moptions *);
 160 int      ip_pcbopts (struct mbuf **, struct mbuf *);
 161 struct ip *
 162          ip_reass (struct ipasfrag *, struct ipq *);
 163 struct in_ifaddr *
 164          ip_rtaddr (struct in_addr);
 165 int      ip_setmoptions (int, struct ip_moptions **, struct mbuf *);
 166 void     ip_slowtimo (void);
 167 struct mbuf *
 168          ip_srcroute (void);
 169 void     ip_stripoptions (struct mbuf *, struct mbuf *);
 170 int      ip_sysctl (int *, n_long, void *, size_t *, void *, size_t);
 171 void     ipintr (void);
 172 int      rip_ctloutput (int, struct socket *, int, int, struct mbuf **);
 173 void     rip_init (void);
 174 void     rip_input (struct mbuf *);
 175 int      rip_output (struct mbuf *, struct socket *, n_long);
 176 int      rip_usrreq (struct socket *,
 177             int, struct mbuf *, struct mbuf *, struct mbuf *);
 178 #endif