sys/netinet6/ip6_var.h

   1 /*      $FreeBSD: src/sys/netinet6/ip6_var.h,v 1.2.2.4 2003/01/23 21:06:47 sam Exp $    */
   2 /*      $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $        */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Copyright (c) 1982, 1986, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)ip_var.h    8.1 (Berkeley) 6/10/93
  62  */
  63
  64 #ifndef _NETINET6_IP6_VAR_H_
  65 #define _NETINET6_IP6_VAR_H_
  66
  67 #ifndef _SYS_TYPES_H_
  68 #include <sys/types.h>
  69 #endif
  70 #ifndef _SYS_QUEUE_H_
  71 #include <sys/queue.h>
  72 #endif
  73 #ifndef _NETINET_IN_H_
  74 #include <netinet/in.h>
  75 #endif
  76
  77 /*
  78  * IP6 reassembly queue structure.  Each fragment
  79  * being reassembled is attached to one of these structures.
  80  */
  81 struct  ip6q {
  82         u_int32_t       ip6q_head;
  83         u_int16_t       ip6q_len;
  84         u_int8_t        ip6q_nxt;       /* ip6f_nxt in first fragment */
  85         u_int8_t        ip6q_hlim;
  86         struct ip6asfrag *ip6q_down;
  87         struct ip6asfrag *ip6q_up;
  88         u_int32_t       ip6q_ident;
  89         u_int8_t        ip6q_arrive;
  90         u_int8_t        ip6q_ttl;
  91         struct in6_addr ip6q_src, ip6q_dst;
  92         struct ip6q     *ip6q_next;
  93         struct ip6q     *ip6q_prev;
  94         int             ip6q_unfrglen;  /* len of unfragmentable part */
  95 #ifdef notyet
  96         u_char          *ip6q_nxtp;
  97 #endif
  98         int             ip6q_nfrag;     /* # of fragments */
  99 };
 100
 101 struct  ip6asfrag {
 102         u_int32_t       ip6af_head;
 103         u_int16_t       ip6af_len;
 104         u_int8_t        ip6af_nxt;
 105         u_int8_t        ip6af_hlim;
 106         /* must not override the above members during reassembling */
 107         struct ip6asfrag *ip6af_down;
 108         struct ip6asfrag *ip6af_up;
 109         struct mbuf     *ip6af_m;
 110         int             ip6af_offset;   /* offset in ip6af_m to next header */
 111         int             ip6af_frglen;   /* fragmentable part length */
 112         int             ip6af_off;      /* fragment offset */
 113         u_int16_t       ip6af_mff;      /* more fragment bit in frag off */
 114 };
 115
 116 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
 117
 118 struct  ip6_moptions {
 119         struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
 120         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
 121         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
 122         LIST_HEAD(, in6_multi_mship) im6o_memberships;
 123 };
 124
 125 /*
 126  * Control options for outgoing packets
 127  */
 128
 129 /* Routing header related info */
 130 struct  ip6po_rhinfo {
 131         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
 132         struct  route_in6 ip6po_rhi_route; /* Route to the 1st hop */
 133 };
 134 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
 135 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
 136
 137 /* Nexthop related info */
 138 struct  ip6po_nhinfo {
 139         struct  sockaddr *ip6po_nhi_nexthop;
 140         struct  route_in6 ip6po_nhi_route; /* Route to the nexthop */
 141 };
 142 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
 143 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
 144
 145 struct  ip6_pktopts {
 146         struct  mbuf *ip6po_m;  /* Pointer to mbuf storing the data */
 147         int     ip6po_hlim;     /* Hoplimit for outgoing packets */
 148
 149         /* Outgoing IF/address information */
 150         struct  in6_pktinfo *ip6po_pktinfo;
 151
 152         /* Next-hop address information */
 153         struct  ip6po_nhinfo ip6po_nhinfo;
 154
 155         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
 156
 157         /* Destination options header (before a routing header) */
 158         struct  ip6_dest *ip6po_dest1;
 159
 160         /* Routing header related info. */
 161         struct  ip6po_rhinfo ip6po_rhinfo;
 162
 163         /* Destination options header (after a routing header) */
 164         struct  ip6_dest *ip6po_dest2;
 165         /*
 166          * below fields are introduced in RFC3542
 167          */
 168         int     ip6po_tclass;   /* traffic class */
 169         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
 170 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
 171 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
 172 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
 173         int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
 174                                            preferred as source address */
 175 #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
 176 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
 177 #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
 178
 179         int ip6po_flags;
 180 #if 0   /* Parameters in this block are obsolete. Do not reuse the values. */
 181 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
 182 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
 183 #endif
 184 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
 185 #define IP6PO_USECOA    0x08    /* use care of address */
 186 };
 187
 188 /*
 189  * Control options for incoming packets
 190  */
 191 struct  ip6stat {
 192         u_quad_t ip6s_total;            /* total packets received */
 193         u_quad_t ip6s_tooshort;         /* packet too short */
 194         u_quad_t ip6s_toosmall;         /* not enough data */
 195         u_quad_t ip6s_fragments;        /* fragments received */
 196         u_quad_t ip6s_fragdropped;      /* frags dropped(dups, out of space) */
 197         u_quad_t ip6s_fragtimeout;      /* fragments timed out */
 198         u_quad_t ip6s_fragoverflow;     /* fragments that exceeded limit */
 199         u_quad_t ip6s_forward;          /* packets forwarded */
 200         u_quad_t ip6s_cantforward;      /* packets rcvd for unreachable dest */
 201         u_quad_t ip6s_redirectsent;     /* packets forwarded on same net */
 202         u_quad_t ip6s_delivered;        /* datagrams delivered to upper level*/
 203         u_quad_t ip6s_localout;         /* total ip packets generated here */
 204         u_quad_t ip6s_odropped;         /* lost packets due to nobufs, etc. */
 205         u_quad_t ip6s_reassembled;      /* total packets reassembled ok */
 206         u_quad_t ip6s_fragmented;       /* datagrams successfully fragmented */
 207         u_quad_t ip6s_ofragments;       /* output fragments created */
 208         u_quad_t ip6s_cantfrag;         /* don't fragment flag was set, etc. */
 209         u_quad_t ip6s_badoptions;       /* error in option processing */
 210         u_quad_t ip6s_noroute;          /* packets discarded due to no route */
 211         u_quad_t ip6s_badvers;          /* ip6 version != 6 */
 212         u_quad_t ip6s_rawout;           /* total raw ip packets generated */
 213         u_quad_t ip6s_badscope;         /* scope error */
 214         u_quad_t ip6s_notmember;        /* don't join this multicast group */
 215         u_quad_t ip6s_nxthist[256];     /* next header history */
 216         u_quad_t ip6s_m1;               /* one mbuf */
 217         u_quad_t ip6s_m2m[32];          /* two or more mbuf */
 218         u_quad_t ip6s_mext1;            /* one ext mbuf */
 219         u_quad_t ip6s_mext2m;           /* two or more ext mbuf */
 220         u_quad_t ip6s_exthdrtoolong;    /* ext hdr are not continuous */
 221         u_quad_t ip6s_nogif;            /* no match gif found */
 222         u_quad_t ip6s_toomanyhdr;       /* discarded due to too many headers */
 223
 224         /*
 225          * statistics for improvement of the source address selection
 226          * algorithm:
 227          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
 228          */
 229         /* number of times that address selection fails */
 230         u_quad_t ip6s_sources_none;
 231         /* number of times that an address on the outgoing I/F is chosen */
 232         u_quad_t ip6s_sources_sameif[16];
 233         /* number of times that an address on a non-outgoing I/F is chosen */
 234         u_quad_t ip6s_sources_otherif[16];
 235         /*
 236          * number of times that an address that has the same scope
 237          * from the destination is chosen.
 238          */
 239         u_quad_t ip6s_sources_samescope[16];
 240         /*
 241          * number of times that an address that has a different scope
 242          * from the destination is chosen.
 243          */
 244         u_quad_t ip6s_sources_otherscope[16];
 245         /* number of times that an deprecated address is chosen */
 246         u_quad_t ip6s_sources_deprecated[16];
 247
 248         u_quad_t ip6s_forward_cachehit;
 249         u_quad_t ip6s_forward_cachemiss;
 250 };
 251
 252 #ifdef _KERNEL
 253 /*
 254  * IPv6 onion peeling state.
 255  * it will be initialized when we come into ip6_input().
 256  * XXX do not make it a kitchen sink!
 257  */
 258 struct ip6aux {
 259         u_int32_t ip6a_flags;
 260 #define IP6A_SWAP       0x01            /* swapped home/care-of on packet */
 261 #define IP6A_HASEEN     0x02            /* HA was present */
 262 #define IP6A_BRUID      0x04            /* BR Unique Identifier was present */
 263 #define IP6A_RTALERTSEEN 0x08           /* rtalert present */
 264
 265         /* ip6.ip6_src */
 266         struct in6_addr ip6a_careof;    /* care-of address of the peer */
 267         struct in6_addr ip6a_home;      /* home address of the peer */
 268         u_int16_t       ip6a_bruid;     /* BR unique identifier */
 269
 270         /* ip6.ip6_dst */
 271         struct in6_ifaddr *ip6a_dstia6; /* my ifaddr that matches ip6_dst */
 272
 273         /* rtalert */
 274         u_int16_t ip6a_rtalert;         /* rtalert option value */
 275
 276         /*
 277          * decapsulation history will be here.
 278          * with IPsec it may not be accurate.
 279          */
 280 };
 281 #endif
 282
 283 #ifdef _KERNEL
 284 /* flags passed to ip6_output as last parameter */
 285 #define IPV6_DADOUTPUT          0x01    /* DAD */
 286 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
 287 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
 288
 289 /* direction passed to ip_hashfn as last parameter */
 290 #define IP6_MPORT_IN            0 /* Find lwkt port for incoming packets */
 291 #define IP6_MPORT_OUT           1 /* Find lwkt port for outgoing packets */
 292
 293 extern struct   ip6stat ip6stat;        /* statistics */
 294 extern u_int32_t ip6_id;                /* fragment identifier */
 295 extern int      ip6_minhlim;            /* minimum hop limit */
 296 extern int      ip6_defhlim;            /* default hop limit */
 297 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
 298 extern int      ip6_forwarding;         /* act as router? */
 299 extern int      ip6_forward_srcrt;      /* forward src-routed? */
 300 extern int      ip6_gif_hlim;           /* Hop limit for gif encap packet */
 301 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
 302 extern int      ip6_rr_prune;           /* router renumbering prefix
 303                                          * walk list every 5 sec.    */
 304
 305 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
 306 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
 307 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
 308 extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
 309 extern int      ip6_sourcecheck;        /* Verify source interface */
 310 extern int      ip6_sourcecheck_interval; /* Interval between log messages */
 311 extern int      ip6_accept_rtadv;
 312 extern int      ip6_log_interval;
 313 extern time_t   ip6_log_time;
 314 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
 315 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
 316
 317 extern u_int32_t ip6_flow_seq;
 318 extern int ip6_auto_flowlabel;
 319 extern int ip6_auto_linklocal;
 320
 321 extern int   ip6_anonportmin;           /* minimum ephemeral port */
 322 extern int   ip6_anonportmax;           /* maximum ephemeral port */
 323 extern int   ip6_lowportmin;            /* minimum reserved port */
 324 extern int   ip6_lowportmax;            /* maximum reserved port */
 325
 326 extern int      ip6_use_tempaddr; /* whether to use temporary addresses. */
 327
 328 extern struct pfil_head inet6_pfil_hook;
 329
 330 extern struct   pr_usrreqs rip6_usrreqs;
 331
 332 struct proc;
 333 struct inpcb;
 334 struct sockopt;
 335 struct in6_ifaddr;
 336 struct ip6_hdr;
 337 union netmsg;
 338
 339 void    icmp6_ctloutput (union netmsg *);
 340
 341 void    ip6_init (void);
 342 void    ip6intr (void);
 343 struct in6_ifaddr *ip6_getdstifaddr (struct mbuf *);
 344 void    ip6_freepcbopts (struct ip6_pktopts *);
 345 void    ip6_freemoptions (struct ip6_moptions *);
 346 int     ip6_unknown_opt (u_int8_t *, struct mbuf *, int);
 347 char *  ip6_get_prevhdr (struct mbuf *, int);
 348 int     ip6_nexthdr (struct mbuf *, int, int, int *);
 349 int     ip6_lasthdr (struct mbuf *, int, int, int *);
 350
 351 struct ip6aux *ip6_addaux (struct mbuf *);
 352 struct ip6aux *ip6_findaux (struct mbuf *);
 353 void    ip6_delaux (struct mbuf *);
 354
 355 int     ip6_mforward (struct ip6_hdr *, struct ifnet *, struct mbuf *);
 356 int     ip6_process_hopopts (struct mbuf *, u_int8_t *, int, u_int32_t *,
 357                                  u_int32_t *);
 358 void    ip6_savecontrol (struct inpcb *, struct mbuf **, struct ip6_hdr *,
 359                              struct mbuf *);
 360 void    ip6_notify_pmtu (struct inpcb *, struct sockaddr_in6 *,
 361                              u_int32_t *);
 362 int     ip6_sysctl (int *, u_int, void *, size_t *, void *, size_t);
 363
 364 void    ip6_forward (struct mbuf *, int);
 365
 366 void    ip6_mloopback (struct ifnet *, struct mbuf *, struct sockaddr_in6 *);
 367 int     ip6_output (struct mbuf *, struct ip6_pktopts *,
 368                         struct route_in6 *,
 369                         int,
 370                         struct ip6_moptions *, struct ifnet **,
 371                         struct inpcb *);
 372 void    ip6_ctloutput_dispatch(netmsg_t msg);
 373 int     ip6_ctloutput (struct socket *, struct sockopt *);
 374 int     ip6_raw_ctloutput (struct socket *, struct sockopt *);
 375 void    init_ip6pktopts (struct ip6_pktopts *);
 376 int
 377 ip6_setpktoptions(struct mbuf *, struct ip6_pktopts *,
 378     struct ip6_pktopts *, int , int);
 379 void    ip6_clearpktopts (struct ip6_pktopts *, int);
 380 struct ip6_pktopts *ip6_copypktopts (struct ip6_pktopts *, int);
 381 int     ip6_optlen (struct inpcb *);
 382
 383 int     route6_input (struct mbuf **, int *, int);
 384
 385 void    frag6_init (void);
 386 int     frag6_input (struct mbuf **, int *, int);
 387 void    frag6_drain (void);
 388
 389 void    rip6_init (void);
 390 int     rip6_input (struct mbuf **, int *, int);
 391 void    rip6_ctlinput (union netmsg *);
 392 void    rip6_ctloutput (union netmsg *);
 393 int     rip6_output (struct mbuf *, struct socket *, ...);
 394 int     rip6_usrreq (struct socket *,
 395             int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
 396
 397 int     dest6_input (struct mbuf **, int *, int);
 398 int     none_input (struct mbuf **, int *, int);
 399 #endif /* _KERNEL */
 400
 401 #endif /* !_NETINET6_IP6_VAR_H_ */