The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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  * $FreeBSD: releng/5.0/sys/netinet/ip_var.h 107112 2002-11-20 18:56:25Z luigi $
   35  */
   36 
   37 #ifndef _NETINET_IP_VAR_H_
   38 #define _NETINET_IP_VAR_H_
   39 
   40 #include <sys/queue.h>
   41 
   42 #ifdef _KERNEL
   43 #include <sys/_label.h>
   44 #endif
   45 
   46 /*
   47  * Overlay for ip header used by other protocols (tcp, udp).
   48  */
   49 struct ipovly {
   50         u_char  ih_x1[9];               /* (unused) */
   51         u_char  ih_pr;                  /* protocol */
   52         u_short ih_len;                 /* protocol length */
   53         struct  in_addr ih_src;         /* source internet address */
   54         struct  in_addr ih_dst;         /* destination internet address */
   55 };
   56 
   57 #ifdef _KERNEL
   58 /*
   59  * Ip reassembly queue structure.  Each fragment
   60  * being reassembled is attached to one of these structures.
   61  * They are timed out after ipq_ttl drops to 0, and may also
   62  * be reclaimed if memory becomes tight.
   63  */
   64 struct ipq {
   65         TAILQ_ENTRY(ipq) ipq_list;      /* to other reass headers */
   66         u_char  ipq_ttl;                /* time for reass q to live */
   67         u_char  ipq_p;                  /* protocol of this fragment */
   68         u_short ipq_id;                 /* sequence id for reassembly */
   69         struct mbuf *ipq_frags;         /* to ip headers of fragments */
   70         struct  in_addr ipq_src,ipq_dst;
   71         u_int32_t ipq_div_info;         /* ipfw divert port & flags */
   72         u_int16_t ipq_div_cookie;       /* ipfw divert cookie */
   73         struct label ipq_label;         /* MAC label */
   74 };
   75 #endif /* _KERNEL */
   76 
   77 /*
   78  * Structure stored in mbuf in inpcb.ip_options
   79  * and passed to ip_output when ip options are in use.
   80  * The actual length of the options (including ipopt_dst)
   81  * is in m_len.
   82  */
   83 #define MAX_IPOPTLEN    40
   84 
   85 struct ipoption {
   86         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
   87         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
   88 };
   89 
   90 /*
   91  * Structure attached to inpcb.ip_moptions and
   92  * passed to ip_output when IP multicast options are in use.
   93  */
   94 struct ip_moptions {
   95         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
   96         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
   97         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
   98         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
   99         u_short imo_num_memberships;    /* no. memberships this socket */
  100         struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
  101         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
  102 };
  103 
  104 struct  ipstat {
  105         u_long  ips_total;              /* total packets received */
  106         u_long  ips_badsum;             /* checksum bad */
  107         u_long  ips_tooshort;           /* packet too short */
  108         u_long  ips_toosmall;           /* not enough data */
  109         u_long  ips_badhlen;            /* ip header length < data size */
  110         u_long  ips_badlen;             /* ip length < ip header length */
  111         u_long  ips_fragments;          /* fragments received */
  112         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
  113         u_long  ips_fragtimeout;        /* fragments timed out */
  114         u_long  ips_forward;            /* packets forwarded */
  115         u_long  ips_fastforward;        /* packets fast forwarded */
  116         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
  117         u_long  ips_redirectsent;       /* packets forwarded on same net */
  118         u_long  ips_noproto;            /* unknown or unsupported protocol */
  119         u_long  ips_delivered;          /* datagrams delivered to upper level*/
  120         u_long  ips_localout;           /* total ip packets generated here */
  121         u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
  122         u_long  ips_reassembled;        /* total packets reassembled ok */
  123         u_long  ips_fragmented;         /* datagrams successfully fragmented */
  124         u_long  ips_ofragments;         /* output fragments created */
  125         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
  126         u_long  ips_badoptions;         /* error in option processing */
  127         u_long  ips_noroute;            /* packets discarded due to no route */
  128         u_long  ips_badvers;            /* ip version != 4 */
  129         u_long  ips_rawout;             /* total raw ip packets generated */
  130         u_long  ips_toolong;            /* ip length > max ip packet size */
  131         u_long  ips_notmember;          /* multicasts for unregistered grps */
  132         u_long  ips_nogif;              /* no match gif found */
  133         u_long  ips_badaddr;            /* invalid address on header */
  134 };
  135 
  136 #ifdef _KERNEL
  137 
  138 /* flags passed to ip_output as last parameter */
  139 #define IP_FORWARDING           0x1             /* most of ip header exists */
  140 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
  141 #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
  142 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
  143 
  144 struct ip;
  145 struct inpcb;
  146 struct route;
  147 struct sockopt;
  148 
  149 extern struct   ipstat  ipstat;
  150 #ifndef RANDOM_IP_ID
  151 extern u_short  ip_id;                          /* ip packet ctr, for ids */
  152 #endif
  153 extern int      ip_defttl;                      /* default IP ttl */
  154 extern int      ipforwarding;                   /* ip forwarding */
  155 extern struct route ipforward_rt;               /* ip forwarding cached route */
  156 extern u_char   ip_protox[];
  157 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
  158 extern struct socket *ip_mrouter; /* multicast routing daemon */
  159 extern int      (*legal_vif_num)(int);
  160 extern u_long   (*ip_mcast_src)(int);
  161 extern int rsvp_on;
  162 extern struct   pr_usrreqs rip_usrreqs;
  163 
  164 int      ip_ctloutput(struct socket *, struct sockopt *sopt);
  165 void     ip_drain(void);
  166 void     ip_freemoptions(struct ip_moptions *);
  167 void     ip_init(void);
  168 extern int       (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
  169                           struct ip_moptions *);
  170 int      ip_output(struct mbuf *,
  171             struct mbuf *, struct route *, int, struct ip_moptions *,
  172             struct inpcb *);
  173 struct in_ifaddr *
  174          ip_rtaddr(struct in_addr, struct route *);
  175 void     ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
  176                 struct mbuf *);
  177 void     ip_slowtimo(void);
  178 struct mbuf *
  179          ip_srcroute(void);
  180 void     ip_stripoptions(struct mbuf *, struct mbuf *);
  181 #ifdef RANDOM_IP_ID
  182 u_int16_t       
  183          ip_randomid(void);
  184 #endif
  185 int     rip_ctloutput(struct socket *, struct sockopt *);
  186 void    rip_ctlinput(int, struct sockaddr *, void *);
  187 void    rip_init(void);
  188 void    rip_input(struct mbuf *, int);
  189 int     rip_output(struct mbuf *, struct socket *, u_long);
  190 void    ipip_input(struct mbuf *, int);
  191 void    rsvp_input(struct mbuf *, int);
  192 int     ip_rsvp_init(struct socket *);
  193 int     ip_rsvp_done(void);
  194 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
  195 extern void     (*ip_rsvp_force_done)(struct socket *);
  196 extern void     (*rsvp_input_p)(struct mbuf *m, int off);
  197 
  198 
  199 #ifdef IPDIVERT
  200 void    div_init(void);
  201 void    div_input(struct mbuf *, int);
  202 void    divert_packet(struct mbuf *m, int incoming, int port, int rule);
  203 extern struct pr_usrreqs div_usrreqs;
  204 #endif
  205 
  206 void    in_delayed_cksum(struct mbuf *m);
  207 
  208 #endif /* _KERNEL */
  209 
  210 #endif /* !_NETINET_IP_VAR_H_ */

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