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. 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: src/sys/netinet/ip_var.h,v 1.50.2.13 2003/08/24 08:24:38 hsu Exp $
  31  */
  32
  33 #ifndef _NETINET_IP_VAR_H_
  34 #define _NETINET_IP_VAR_H_
  35
  36 #ifndef _SYS_TYPES_H_
  37 #include <sys/types.h>
  38 #endif
  39 #ifndef _SYS_QUEUE_H_
  40 #include <sys/queue.h>
  41 #endif
  42 #ifndef _NETINET_IN_H_
  43 #include <netinet/in.h>
  44 #endif
  45
  46 #ifdef _KERNEL
  47
  48 #include <machine/endian.h>
  49 #ifndef _MACHINE_PARAM_H_
  50 #include <machine/param.h>
  51 #endif
  52 #ifndef _NET_ROUTE_H
  53 #include <net/route.h>
  54 #endif
  55
  56 #endif
  57
  58 /*
  59  * Overlay for ip header used by other protocols (tcp, udp).
  60  */
  61 struct ipovly {
  62         u_char  ih_x1[9];               /* (unused) */
  63         u_char  ih_pr;                  /* protocol */
  64         u_short ih_len;                 /* protocol length */
  65         struct  in_addr ih_src;         /* source internet address */
  66         struct  in_addr ih_dst;         /* destination internet address */
  67 };
  68
  69 /*
  70  * Ip reassembly queue structure.  Each fragment
  71  * being reassembled is attached to one of these structures.
  72  * They are timed out after ipq_ttl drops to 0, and may also
  73  * be reclaimed if memory becomes tight.
  74  */
  75 struct ipq {
  76         TAILQ_ENTRY(ipq) ipq_list;      /* to other reass headers */
  77         u_char  ipq_ttl;                /* time for reass q to live */
  78         u_char  ipq_p;                  /* protocol of this fragment */
  79         u_short ipq_id;                 /* sequence id for reassembly */
  80         struct mbuf *ipq_frags;         /* to ip headers of fragments */
  81         struct  in_addr ipq_src,ipq_dst;
  82         u_char  ipq_nfrags;             /* # frags in this packet */
  83 };
  84
  85 /*
  86  * Structure stored in mbuf in inpcb.ip_options
  87  * and passed to ip_output when ip options are in use.
  88  * The actual length of the options (including ipopt_dst)
  89  * is in m_len.
  90  */
  91 #define MAX_IPOPTLEN    40
  92
  93 struct ipoption {
  94         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
  95         char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
  96 };
  97
  98 /*
  99  * Structure attached to inpcb.ip_moptions and
 100  * passed to ip_output when IP multicast options are in use.
 101  */
 102 struct ip_moptions {
 103         struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
 104         struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
 105         u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
 106         u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
 107         u_short imo_num_memberships;    /* no. memberships this socket */
 108         u_short imo_max_memberships;    /* max memberships this socket */
 109         struct  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
 110         u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
 111 };
 112
 113 /*
 114  * IP Statistics.
 115  *
 116  * NOTE: Make sure this struct's size is multiple cache line size.
 117  */
 118 struct  ip_stats {
 119         u_long  ips_total;              /* total packets received */
 120         u_long  ips_badsum;             /* checksum bad */
 121         u_long  ips_tooshort;           /* packet too short */
 122         u_long  ips_toosmall;           /* not enough data */
 123         u_long  ips_badhlen;            /* ip header length < data size */
 124         u_long  ips_badlen;             /* ip length < ip header length */
 125         u_long  ips_fragments;          /* fragments received */
 126         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
 127         u_long  ips_fragtimeout;        /* fragments timed out */
 128         u_long  ips_forward;            /* packets forwarded */
 129         u_long  ips_fastforward;        /* packets fast forwarded */
 130         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
 131         u_long  ips_redirectsent;       /* packets forwarded on same net */
 132         u_long  ips_noproto;            /* unknown or unsupported protocol */
 133         u_long  ips_delivered;          /* datagrams delivered to upper level*/
 134         u_long  ips_localout;           /* total ip packets generated here */
 135         u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
 136         u_long  ips_reassembled;        /* total packets reassembled ok */
 137         u_long  ips_fragmented;         /* datagrams successfully fragmented */
 138         u_long  ips_ofragments;         /* output fragments created */
 139         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
 140         u_long  ips_badoptions;         /* error in option processing */
 141         u_long  ips_noroute;            /* packets discarded due to no route */
 142         u_long  ips_badvers;            /* ip version != 4 */
 143         u_long  ips_rawout;             /* total raw ip packets generated */
 144         u_long  ips_toolong;            /* ip length > max ip packet size */
 145         u_long  ips_notmember;          /* multicasts for unregistered grps */
 146         u_long  ips_nogif;              /* no match gif found */
 147         u_long  ips_badaddr;            /* invalid address on header */
 148         u_long  ips_pad[3];             /* pad to cache line size (64B) */
 149 };
 150 #ifdef _KERNEL
 151 CTASSERT((sizeof(struct ip_stats) & __VM_CACHELINE_MASK) == 0);
 152 #endif
 153
 154 #ifdef _KERNEL
 155
 156 #define ipstat  ipstats_percpu[mycpuid]
 157
 158 extern struct ip_stats  ipstats_percpu[MAXCPU];
 159
 160 /* flags passed to ip_output as last parameter */
 161 #define IP_FORWARDING           0x1             /* most of ip header exists */
 162 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
 163 #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
 164 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
 165 #define IP_DEBUGROUTE           0x10000         /* debug route */
 166
 167 struct ip;
 168 struct inpcb;
 169 struct route;
 170 struct sockopt;
 171 struct lwkt_port;
 172 struct pktinfo;
 173 union netmsg;
 174
 175 extern u_short  ip_id;                          /* ip packet ctr, for ids */
 176 extern int      ip_defttl;                      /* default IP ttl */
 177 extern int      ipforwarding;                   /* ip forwarding */
 178 extern int      ip_porthash_trycount;
 179 extern u_char   ip_protox[];
 180 extern struct socket *ip_rsvpd;         /* reservation protocol daemon */
 181 extern struct socket *ip_mrouter;       /* multicast routing daemon */
 182 extern int      (*legal_vif_num)(int);
 183 extern u_long   (*ip_mcast_src)(int);
 184 extern int rsvp_on;
 185 extern struct   pr_usrreqs rip_usrreqs;
 186
 187 void     ip_ctloutput(union netmsg *);
 188 void     ip_drain(void);
 189 int      ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 190             u_long if_hwassist_flags, int sw_csum);
 191 struct mbuf *
 192          ip_reass(struct mbuf *);
 193 void     ip_freemoptions(struct ip_moptions *);
 194 void     ip_init(void);
 195 extern int       (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
 196                           struct ip_moptions *);
 197
 198 void     ip_hashfn(struct mbuf **, int);
 199 void     ip_hashcheck(struct mbuf *, const struct pktinfo *);
 200 struct mbuf *
 201          ip_rehashm(struct mbuf *);
 202 void     ip_transport_redispatch(struct lwkt_port *, struct mbuf *, int);
 203
 204 boolean_t
 205          ip_lengthcheck(struct mbuf **, int);
 206 int      ip_output(struct mbuf *,
 207             struct mbuf *, struct route *, int, struct ip_moptions *,
 208             struct inpcb *);
 209 struct in_ifaddr *
 210          ip_rtaddr(struct in_addr, struct route *);
 211 void     ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
 212                 struct mbuf *);
 213 struct mbuf *
 214          ip_srcroute(struct mbuf *);
 215 void     ip_stripoptions(struct mbuf *);
 216 u_int16_t ip_randomid(void);
 217 void    rip_ctloutput(union netmsg *);
 218 void    rip_init(void);
 219 int     rip_input(struct mbuf **, int *, int);
 220 int     rip_output(struct mbuf *, struct socket *, ...);
 221 extern int (*ipip_input)(struct mbuf **, int *, int);
 222 int     rsvp_input(struct mbuf **, int *, int);
 223 int     ip_rsvp_init(struct socket *);
 224 int     ip_rsvp_done(void);
 225 extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
 226 extern void     (*ip_rsvp_force_done)(struct socket *);
 227 extern int      (*rsvp_input_p)(struct mbuf **, int *, int);
 228
 229 extern  struct pfil_head inet_pfil_hook;
 230
 231 void    in_delayed_cksum(struct mbuf *m);
 232
 233 static __inline uint16_t ip_newid(void);
 234 extern int ip_do_randomid;
 235
 236 static __inline uint16_t
 237 ip_newid(void)
 238 {
 239     if (ip_do_randomid)
 240         return ip_randomid();
 241     else
 242         return __htons(ip_id++);
 243 }
 244
 245 #endif /* _KERNEL */
 246
 247 #endif /* !_NETINET_IP_VAR_H_ */