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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)ip_var.h    8.2 (Berkeley) 1/9/95
   30  * $FreeBSD: releng/6.3/sys/netinet/ip_var.h 164728 2006-11-28 21:41:12Z rwatson $
   31  */
   32 
   33 #ifndef _NETINET_IP_VAR_H_
   34 #define _NETINET_IP_VAR_H_
   35 
   36 #include <sys/queue.h>
   37 
   38 /*
   39  * Overlay for ip header used by other protocols (tcp, udp).
   40  */
   41 struct ipovly {
   42         u_char  ih_x1[9];               /* (unused) */
   43         u_char  ih_pr;                  /* protocol */
   44         u_short ih_len;                 /* protocol length */
   45         struct  in_addr ih_src;         /* source internet address */
   46         struct  in_addr ih_dst;         /* destination internet address */
   47 };
   48 
   49 #ifdef _KERNEL
   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         TAILQ_ENTRY(ipq) ipq_list;      /* 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 mbuf *ipq_frags;         /* to ip headers of fragments */
   62         struct  in_addr ipq_src,ipq_dst;
   63         u_char  ipq_nfrags;             /* # frags in this packet */
   64         struct label *ipq_label;                /* MAC label */
   65 };
   66 #endif /* _KERNEL */
   67 
   68 /*
   69  * Structure stored in mbuf in inpcb.ip_options
   70  * and passed to ip_output when ip options are in use.
   71  * The actual length of the options (including ipopt_dst)
   72  * is in m_len.
   73  */
   74 #define MAX_IPOPTLEN    40
   75 
   76 struct ipoption {
   77         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
   78         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
   79 };
   80 
   81 /*
   82  * Structure attached to inpcb.ip_moptions and
   83  * passed to ip_output when IP multicast options are in use.
   84  */
   85 struct ip_moptions {
   86         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
   87         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
   88         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
   89         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
   90         u_short imo_num_memberships;    /* no. memberships this socket */
   91         struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
   92         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
   93 };
   94 
   95 struct  ipstat {
   96         u_long  ips_total;              /* total packets received */
   97         u_long  ips_badsum;             /* checksum bad */
   98         u_long  ips_tooshort;           /* packet too short */
   99         u_long  ips_toosmall;           /* not enough data */
  100         u_long  ips_badhlen;            /* ip header length < data size */
  101         u_long  ips_badlen;             /* ip length < ip header length */
  102         u_long  ips_fragments;          /* fragments received */
  103         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
  104         u_long  ips_fragtimeout;        /* fragments timed out */
  105         u_long  ips_forward;            /* packets forwarded */
  106         u_long  ips_fastforward;        /* packets fast forwarded */
  107         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
  108         u_long  ips_redirectsent;       /* packets forwarded on same net */
  109         u_long  ips_noproto;            /* unknown or unsupported protocol */
  110         u_long  ips_delivered;          /* datagrams delivered to upper level*/
  111         u_long  ips_localout;           /* total ip packets generated here */
  112         u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
  113         u_long  ips_reassembled;        /* total packets reassembled ok */
  114         u_long  ips_fragmented;         /* datagrams successfully fragmented */
  115         u_long  ips_ofragments;         /* output fragments created */
  116         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
  117         u_long  ips_badoptions;         /* error in option processing */
  118         u_long  ips_noroute;            /* packets discarded due to no route */
  119         u_long  ips_badvers;            /* ip version != 4 */
  120         u_long  ips_rawout;             /* total raw ip packets generated */
  121         u_long  ips_toolong;            /* ip length > max ip packet size */
  122         u_long  ips_notmember;          /* multicasts for unregistered grps */
  123         u_long  ips_nogif;              /* no match gif found */
  124         u_long  ips_badaddr;            /* invalid address on header */
  125 };
  126 
  127 #ifdef _KERNEL
  128 
  129 /* flags passed to ip_output as last parameter */
  130 #define IP_FORWARDING           0x1             /* most of ip header exists */
  131 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
  132 #define IP_SENDONES             0x4             /* send all-ones broadcast */
  133 #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
  134 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
  135 
  136 /* mbuf flag used by ip_fastfwd */
  137 #define M_FASTFWD_OURS          M_PROTO1        /* changed dst to local */
  138 
  139 #ifdef __NO_STRICT_ALIGNMENT
  140 #define IP_HDR_ALIGNED_P(ip)    1
  141 #else
  142 #define IP_HDR_ALIGNED_P(ip)    ((((intptr_t) (ip)) & 3) == 0)
  143 #endif
  144 
  145 struct ip;
  146 struct inpcb;
  147 struct inpcbinfo;
  148 struct route;
  149 struct sockopt;
  150 
  151 extern struct   ipstat  ipstat;
  152 extern u_short  ip_id;                          /* ip packet ctr, for ids */
  153 extern int      ip_defttl;                      /* default IP ttl */
  154 extern int      ipforwarding;                   /* ip forwarding */
  155 extern int      ip_doopts;                      /* process or ignore IP options */
  156 #ifdef IPSTEALTH
  157 extern int      ipstealth;                      /* stealth forwarding */
  158 #endif
  159 extern u_char   ip_protox[];
  160 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
  161 extern struct socket *ip_mrouter; /* multicast routing daemon */
  162 extern int      (*legal_vif_num)(int);
  163 extern u_long   (*ip_mcast_src)(int);
  164 extern int rsvp_on;
  165 extern struct   pr_usrreqs rip_usrreqs;
  166 
  167 int      ip_ctloutput(struct socket *, struct sockopt *sopt);
  168 int      ip_ctloutput_pcbinfo(struct socket *, struct sockopt *sopt,
  169             struct inpcbinfo *pcbinfo);
  170 void     ip_drain(void);
  171 void     ip_fini(void *xtp);
  172 int      ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
  173             u_long if_hwassist_flags, int sw_csum);
  174 void     ip_freemoptions(struct ip_moptions *);
  175 void     ip_init(void);
  176 extern int       (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
  177                           struct ip_moptions *);
  178 int      ip_output(struct mbuf *,
  179             struct mbuf *, struct route *, int, struct ip_moptions *,
  180             struct inpcb *);
  181 int      ipproto_register(u_char);
  182 int      ipproto_unregister(u_char);
  183 struct mbuf *
  184          ip_reass(struct mbuf *);
  185 struct in_ifaddr *
  186          ip_rtaddr(struct in_addr);
  187 void     ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
  188                 struct mbuf *);
  189 void     ip_slowtimo(void);
  190 struct mbuf *
  191          ip_srcroute(struct mbuf *);
  192 void     ip_stripoptions(struct mbuf *, struct mbuf *);
  193 u_int16_t       ip_randomid(void);
  194 int     rip_ctloutput(struct socket *, struct sockopt *);
  195 void    rip_ctlinput(int, struct sockaddr *, void *);
  196 void    rip_init(void);
  197 void    rip_input(struct mbuf *, int);
  198 int     rip_output(struct mbuf *, struct socket *, u_long);
  199 void    ipip_input(struct mbuf *, int);
  200 void    rsvp_input(struct mbuf *, int);
  201 int     ip_rsvp_init(struct socket *);
  202 int     ip_rsvp_done(void);
  203 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
  204 extern void     (*ip_rsvp_force_done)(struct socket *);
  205 extern void     (*rsvp_input_p)(struct mbuf *m, int off);
  206 
  207 extern  struct pfil_head inet_pfil_hook;        /* packet filter hooks */
  208 
  209 void    in_delayed_cksum(struct mbuf *m);
  210 
  211 static __inline uint16_t ip_newid(void);
  212 extern int ip_do_randomid;
  213 
  214 static __inline uint16_t
  215 ip_newid(void)
  216 {
  217         if (ip_do_randomid)
  218                 return ip_randomid();
  219 
  220         return htons(ip_id++);
  221 }
  222 
  223 #endif /* _KERNEL */
  224 
  225 #endif /* !_NETINET_IP_VAR_H_ */

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