sys/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  * $FreeBSD: src/sys/netinet/ip_var.h,v 1.50.2.13 2003/08/24 08:24:38 hsu Exp $
  35  * $DragonFly: src/sys/netinet/ip_var.h,v 1.20 2006/09/30 23:23:28 swildner Exp $
  36  */
  37
  38 #ifndef _NETINET_IP_VAR_H_
  39 #define _NETINET_IP_VAR_H_
  40
  41 #ifndef _SYS_TYPES_H_
  42 #include <sys/types.h>
  43 #endif
  44 #ifndef _SYS_QUEUE_H_
  45 #include <sys/queue.h>
  46 #endif
  47 #ifndef _NETINET_IN_H_
  48 #include <netinet/in.h>
  49 #endif
  50
  51 #ifdef _KERNEL
  52
  53 #ifndef _MACHINE_ENDIAN_H_
  54 #include <machine/endian.h>
  55 #endif
  56 #ifndef _MACHINE_PARAM_H_
  57 #include <machine/param.h>
  58 #endif
  59 #ifndef _NET_ROUTE_H
  60 #include <net/route.h>
  61 #endif
  62
  63 #endif
  64
  65 /*
  66  * Overlay for ip header used by other protocols (tcp, udp).
  67  */
  68 struct ipovly {
  69         u_char  ih_x1[9];               /* (unused) */
  70         u_char  ih_pr;                  /* protocol */
  71         u_short ih_len;                 /* protocol length */
  72         struct  in_addr ih_src;         /* source internet address */
  73         struct  in_addr ih_dst;         /* destination internet address */
  74 };
  75
  76 /*
  77  * Ip reassembly queue structure.  Each fragment
  78  * being reassembled is attached to one of these structures.
  79  * They are timed out after ipq_ttl drops to 0, and may also
  80  * be reclaimed if memory becomes tight.
  81  */
  82 struct ipq {
  83         struct  ipq *next,*prev;        /* to other reass headers */
  84         u_char  ipq_ttl;                /* time for reass q to live */
  85         u_char  ipq_p;                  /* protocol of this fragment */
  86         u_short ipq_id;                 /* sequence id for reassembly */
  87         struct mbuf *ipq_frags;         /* to ip headers of fragments */
  88         struct  in_addr ipq_src,ipq_dst;
  89         u_char  ipq_nfrags;             /* # frags in this packet */
  90 #ifdef IPDIVERT
  91         u_int32_t ipq_div_info;         /* ipfw divert port & flags */
  92 #endif
  93 };
  94
  95 /*
  96  * Structure stored in mbuf in inpcb.ip_options
  97  * and passed to ip_output when ip options are in use.
  98  * The actual length of the options (including ipopt_dst)
  99  * is in m_len.
 100  */
 101 #define MAX_IPOPTLEN    40
 102
 103 struct ipoption {
 104         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
 105         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
 106 };
 107
 108 /*
 109  * Structure attached to inpcb.ip_moptions and
 110  * passed to ip_output when IP multicast options are in use.
 111  */
 112 struct ip_moptions {
 113         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
 114         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
 115         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
 116         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
 117         u_short imo_num_memberships;    /* no. memberships this socket */
 118         struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
 119         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
 120 };
 121
 122 /*
 123  * IP Statistics.
 124  */
 125 struct  ip_stats {
 126         u_long  ips_total;              /* total packets received */
 127         u_long  ips_badsum;             /* checksum bad */
 128         u_long  ips_tooshort;           /* packet too short */
 129         u_long  ips_toosmall;           /* not enough data */
 130         u_long  ips_badhlen;            /* ip header length < data size */
 131         u_long  ips_badlen;             /* ip length < ip header length */
 132         u_long  ips_fragments;          /* fragments received */
 133         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
 134         u_long  ips_fragtimeout;        /* fragments timed out */
 135         u_long  ips_forward;            /* packets forwarded */
 136         u_long  ips_fastforward;        /* packets fast forwarded */
 137         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
 138         u_long  ips_redirectsent;       /* packets forwarded on same net */
 139         u_long  ips_noproto;            /* unknown or unsupported protocol */
 140         u_long  ips_delivered;          /* datagrams delivered to upper level*/
 141         u_long  ips_localout;           /* total ip packets generated here */
 142         u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
 143         u_long  ips_reassembled;        /* total packets reassembled ok */
 144         u_long  ips_fragmented;         /* datagrams successfully fragmented */
 145         u_long  ips_ofragments;         /* output fragments created */
 146         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
 147         u_long  ips_badoptions;         /* error in option processing */
 148         u_long  ips_noroute;            /* packets discarded due to no route */
 149         u_long  ips_badvers;            /* ip version != 4 */
 150         u_long  ips_rawout;             /* total raw ip packets generated */
 151         u_long  ips_toolong;            /* ip length > max ip packet size */
 152         u_long  ips_notmember;          /* multicasts for unregistered grps */
 153         u_long  ips_nogif;              /* no match gif found */
 154         u_long  ips_badaddr;            /* invalid address on header */
 155 };
 156
 157 #ifdef _KERNEL
 158
 159 #if defined(SMP)
 160 #define ipstat  ipstats_percpu[mycpuid]
 161 #else /* !SMP */
 162 #define ipstat  ipstats_percpu[0]
 163 #endif
 164
 165 extern struct ip_stats  ipstats_percpu[MAXCPU];
 166
 167 /* flags passed to ip_output as last parameter */
 168 #define IP_FORWARDING           0x1             /* most of ip header exists */
 169 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
 170 #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
 171 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
 172
 173 struct ip;
 174 struct inpcb;
 175 struct route;
 176 struct sockopt;
 177 struct lwkt_port;
 178
 179 extern u_short  ip_id;                          /* ip packet ctr, for ids */
 180 extern int      ip_defttl;                      /* default IP ttl */
 181 extern int      ipforwarding;                   /* ip forwarding */
 182 extern struct route ipforward_rt[];             /* ip forwarding cached route */
 183 extern u_char   ip_protox[];
 184 extern struct socket *ip_rsvpd;         /* reservation protocol daemon */
 185 extern struct socket *ip_mrouter;       /* multicast routing daemon */
 186 extern int      (*legal_vif_num)(int);
 187 extern u_long   (*ip_mcast_src)(int);
 188 extern int rsvp_on;
 189 extern struct   pr_usrreqs rip_usrreqs;
 190
 191 int      ip_ctloutput(struct socket *, struct sockopt *sopt);
 192 void     ip_drain(void);
 193 int      ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 194             u_long if_hwassist_flags, int sw_csum);
 195 void     ip_freemoptions(struct ip_moptions *);
 196 void     ip_init(void);
 197 extern int       (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
 198                           struct ip_moptions *);
 199 struct lwkt_port *
 200          ip_mport(struct mbuf **);
 201 boolean_t
 202          ip_lengthcheck(struct mbuf **);
 203 int      ip_output(struct mbuf *,
 204             struct mbuf *, struct route *, int, struct ip_moptions *,
 205             struct inpcb *);
 206 struct in_ifaddr *
 207          ip_rtaddr(struct in_addr, struct route *);
 208 void     ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
 209                 struct mbuf *);
 210 void     ip_slowtimo(void);
 211 struct mbuf *
 212          ip_srcroute(void);
 213 void     ip_stripoptions(struct mbuf *);
 214 u_int16_t ip_randomid(void);
 215 int     rip_ctloutput(struct socket *, struct sockopt *);
 216 void    rip_ctlinput(int, struct sockaddr *, void *);
 217 void    rip_init(void);
 218 void    rip_input(struct mbuf *, ...);
 219 int     rip_output(struct mbuf *, struct socket *, ...);
 220 extern void     (*ipip_input)(struct mbuf *, int, int);
 221 void    rsvp_input(struct mbuf *, ...);
 222 int     ip_rsvp_init(struct socket *);
 223 int     ip_rsvp_done(void);
 224 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
 225 extern void     (*ip_rsvp_force_done)(struct socket *);
 226 extern void     (*rsvp_input_p)(struct mbuf *m, ...);
 227
 228 #ifdef IPDIVERT
 229 void    div_init(void);
 230 void    div_input(struct mbuf *, ...);
 231 void    divert_packet(struct mbuf *m, int incoming, int port);
 232 extern struct pr_usrreqs div_usrreqs;
 233 #endif
 234
 235 extern  struct pfil_head inet_pfil_hook;
 236
 237 void    in_delayed_cksum(struct mbuf *m);
 238
 239 static __inline uint16_t ip_newid(void);
 240 extern int ip_do_randomid;
 241
 242 static __inline uint16_t
 243 ip_newid(void)
 244 {
 245     if (ip_do_randomid)
 246         return ip_randomid();
 247     else
 248         return __htons(ip_id++);
 249 }
 250
 251 #endif /* _KERNEL */
 252
 253 #endif /* !_NETINET_IP_VAR_H_ */