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 /*      $DragonFly: src/sys/netinet6/ip6_var.h,v 1.13 2008/09/04 09:08:22 hasso Exp $   */
   3 /*      $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $        */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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
  34 /*
  35  * Copyright (c) 1982, 1986, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)ip_var.h    8.1 (Berkeley) 6/10/93
  67  */
  68
  69 #ifndef _NETINET6_IP6_VAR_H_
  70 #define _NETINET6_IP6_VAR_H_
  71
  72 #ifndef _SYS_TYPES_H_
  73 #include <sys/types.h>
  74 #endif
  75 #ifndef _SYS_QUEUE_H_
  76 #include <sys/queue.h>
  77 #endif
  78 #ifndef _NETINET_IN_H_
  79 #include <netinet/in.h>
  80 #endif
  81
  82 /*
  83  * IP6 reassembly queue structure.  Each fragment
  84  * being reassembled is attached to one of these structures.
  85  */
  86 struct  ip6q {
  87         u_int32_t       ip6q_head;
  88         u_int16_t       ip6q_len;
  89         u_int8_t        ip6q_nxt;       /* ip6f_nxt in first fragment */
  90         u_int8_t        ip6q_hlim;
  91         struct ip6asfrag *ip6q_down;
  92         struct ip6asfrag *ip6q_up;
  93         u_int32_t       ip6q_ident;
  94         u_int8_t        ip6q_arrive;
  95         u_int8_t        ip6q_ttl;
  96         struct in6_addr ip6q_src, ip6q_dst;
  97         struct ip6q     *ip6q_next;
  98         struct ip6q     *ip6q_prev;
  99         int             ip6q_unfrglen;  /* len of unfragmentable part */
 100 #ifdef notyet
 101         u_char          *ip6q_nxtp;
 102 #endif
 103         int             ip6q_nfrag;     /* # of fragments */
 104 };
 105
 106 struct  ip6asfrag {
 107         u_int32_t       ip6af_head;
 108         u_int16_t       ip6af_len;
 109         u_int8_t        ip6af_nxt;
 110         u_int8_t        ip6af_hlim;
 111         /* must not override the above members during reassembling */
 112         struct ip6asfrag *ip6af_down;
 113         struct ip6asfrag *ip6af_up;
 114         struct mbuf     *ip6af_m;
 115         int             ip6af_offset;   /* offset in ip6af_m to next header */
 116         int             ip6af_frglen;   /* fragmentable part length */
 117         int             ip6af_off;      /* fragment offset */
 118         u_int16_t       ip6af_mff;      /* more fragment bit in frag off */
 119 };
 120
 121 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
 122
 123 struct  ip6_moptions {
 124         struct  ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
 125         u_char  im6o_multicast_hlim;    /* hoplimit for outgoing multicasts */
 126         u_char  im6o_multicast_loop;    /* 1 >= hear sends if a member */
 127         LIST_HEAD(, in6_multi_mship) im6o_memberships;
 128 };
 129
 130 /*
 131  * Control options for outgoing packets
 132  */
 133
 134 /* Routing header related info */
 135 struct  ip6po_rhinfo {
 136         struct  ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
 137         struct  route_in6 ip6po_rhi_route; /* Route to the 1st hop */
 138 };
 139 #define ip6po_rthdr     ip6po_rhinfo.ip6po_rhi_rthdr
 140 #define ip6po_route     ip6po_rhinfo.ip6po_rhi_route
 141
 142 /* Nexthop related info */
 143 struct  ip6po_nhinfo {
 144         struct  sockaddr *ip6po_nhi_nexthop;
 145         struct  route_in6 ip6po_nhi_route; /* Route to the nexthop */
 146 };
 147 #define ip6po_nexthop   ip6po_nhinfo.ip6po_nhi_nexthop
 148 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
 149
 150 struct  ip6_pktopts {
 151         struct  mbuf *ip6po_m;  /* Pointer to mbuf storing the data */
 152         int     ip6po_hlim;     /* Hoplimit for outgoing packets */
 153
 154         /* Outgoing IF/address information */
 155         struct  in6_pktinfo *ip6po_pktinfo;
 156
 157         /* Next-hop address information */
 158         struct  ip6po_nhinfo ip6po_nhinfo;
 159
 160         struct  ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
 161
 162         /* Destination options header (before a routing header) */
 163         struct  ip6_dest *ip6po_dest1;
 164
 165         /* Routing header related info. */
 166         struct  ip6po_rhinfo ip6po_rhinfo;
 167
 168         /* Destination options header (after a routing header) */
 169         struct  ip6_dest *ip6po_dest2;
 170         /*
 171          * below fields are introduced in RFC3542
 172          */
 173         int     ip6po_tclass;   /* traffic class */
 174         int     ip6po_minmtu;  /* fragment vs PMTU discovery policy */
 175 #define IP6PO_MINMTU_MCASTONLY  -1 /* default; send at min MTU for multicast*/
 176 #define IP6PO_MINMTU_DISABLE     0 /* always perform pmtu disc */
 177 #define IP6PO_MINMTU_ALL         1 /* always send at min MTU */
 178         int     ip6po_prefer_tempaddr;  /* whether temporary addresses are
 179                                            preferred as source address */
 180 #define IP6PO_TEMPADDR_SYSTEM   -1 /* follow the system default */
 181 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
 182 #define IP6PO_TEMPADDR_PREFER    1 /* prefer temporary address */
 183
 184         int ip6po_flags;
 185 #if 0   /* Parameters in this block are obsolete. Do not reuse the values. */
 186 #define IP6PO_REACHCONF 0x01    /* upper-layer reachability confirmation. */
 187 #define IP6PO_MINMTU    0x02    /* use minimum MTU (IPV6_USE_MIN_MTU) */
 188 #endif
 189 #define IP6PO_DONTFRAG  0x04    /* disable fragmentation (IPV6_DONTFRAG) */
 190 #define IP6PO_USECOA    0x08    /* use care of address */
 191 };
 192
 193 /*
 194  * Control options for incoming packets
 195  */
 196 struct  ip6stat {
 197         u_quad_t ip6s_total;            /* total packets received */
 198         u_quad_t ip6s_tooshort;         /* packet too short */
 199         u_quad_t ip6s_toosmall;         /* not enough data */
 200         u_quad_t ip6s_fragments;        /* fragments received */
 201         u_quad_t ip6s_fragdropped;      /* frags dropped(dups, out of space) */
 202         u_quad_t ip6s_fragtimeout;      /* fragments timed out */
 203         u_quad_t ip6s_fragoverflow;     /* fragments that exceeded limit */
 204         u_quad_t ip6s_forward;          /* packets forwarded */
 205         u_quad_t ip6s_cantforward;      /* packets rcvd for unreachable dest */
 206         u_quad_t ip6s_redirectsent;     /* packets forwarded on same net */
 207         u_quad_t ip6s_delivered;        /* datagrams delivered to upper level*/
 208         u_quad_t ip6s_localout;         /* total ip packets generated here */
 209         u_quad_t ip6s_odropped;         /* lost packets due to nobufs, etc. */
 210         u_quad_t ip6s_reassembled;      /* total packets reassembled ok */
 211         u_quad_t ip6s_fragmented;       /* datagrams successfully fragmented */
 212         u_quad_t ip6s_ofragments;       /* output fragments created */
 213         u_quad_t ip6s_cantfrag;         /* don't fragment flag was set, etc. */
 214         u_quad_t ip6s_badoptions;       /* error in option processing */
 215         u_quad_t ip6s_noroute;          /* packets discarded due to no route */
 216         u_quad_t ip6s_badvers;          /* ip6 version != 6 */
 217         u_quad_t ip6s_rawout;           /* total raw ip packets generated */
 218         u_quad_t ip6s_badscope;         /* scope error */
 219         u_quad_t ip6s_notmember;        /* don't join this multicast group */
 220         u_quad_t ip6s_nxthist[256];     /* next header history */
 221         u_quad_t ip6s_m1;               /* one mbuf */
 222         u_quad_t ip6s_m2m[32];          /* two or more mbuf */
 223         u_quad_t ip6s_mext1;            /* one ext mbuf */
 224         u_quad_t ip6s_mext2m;           /* two or more ext mbuf */
 225         u_quad_t ip6s_exthdrtoolong;    /* ext hdr are not continuous */
 226         u_quad_t ip6s_nogif;            /* no match gif found */
 227         u_quad_t ip6s_toomanyhdr;       /* discarded due to too many headers */
 228
 229         /*
 230          * statistics for improvement of the source address selection
 231          * algorithm:
 232          * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
 233          */
 234         /* number of times that address selection fails */
 235         u_quad_t ip6s_sources_none;
 236         /* number of times that an address on the outgoing I/F is chosen */
 237         u_quad_t ip6s_sources_sameif[16];
 238         /* number of times that an address on a non-outgoing I/F is chosen */
 239         u_quad_t ip6s_sources_otherif[16];
 240         /*
 241          * number of times that an address that has the same scope
 242          * from the destination is chosen.
 243          */
 244         u_quad_t ip6s_sources_samescope[16];
 245         /*
 246          * number of times that an address that has a different scope
 247          * from the destination is chosen.
 248          */
 249         u_quad_t ip6s_sources_otherscope[16];
 250         /* number of times that an deprecated address is chosen */
 251         u_quad_t ip6s_sources_deprecated[16];
 252
 253         u_quad_t ip6s_forward_cachehit;
 254         u_quad_t ip6s_forward_cachemiss;
 255 };
 256
 257 #ifdef _KERNEL
 258 /*
 259  * IPv6 onion peeling state.
 260  * it will be initialized when we come into ip6_input().
 261  * XXX do not make it a kitchen sink!
 262  */
 263 struct ip6aux {
 264         u_int32_t ip6a_flags;
 265 #define IP6A_SWAP       0x01            /* swapped home/care-of on packet */
 266 #define IP6A_HASEEN     0x02            /* HA was present */
 267 #define IP6A_BRUID      0x04            /* BR Unique Identifier was present */
 268 #define IP6A_RTALERTSEEN 0x08           /* rtalert present */
 269
 270         /* ip6.ip6_src */
 271         struct in6_addr ip6a_careof;    /* care-of address of the peer */
 272         struct in6_addr ip6a_home;      /* home address of the peer */
 273         u_int16_t       ip6a_bruid;     /* BR unique identifier */
 274
 275         /* ip6.ip6_dst */
 276         struct in6_ifaddr *ip6a_dstia6; /* my ifaddr that matches ip6_dst */
 277
 278         /* rtalert */
 279         u_int16_t ip6a_rtalert;         /* rtalert option value */
 280
 281         /*
 282          * decapsulation history will be here.
 283          * with IPsec it may not be accurate.
 284          */
 285 };
 286 #endif
 287
 288 #ifdef _KERNEL
 289 /* flags passed to ip6_output as last parameter */
 290 #define IPV6_DADOUTPUT          0x01    /* DAD */
 291 #define IPV6_FORWARDING         0x02    /* most of IPv6 header exists */
 292 #define IPV6_MINMTU             0x04    /* use minimum MTU (IPV6_USE_MIN_MTU) */
 293
 294 /* direction passed to ip_hashfn as last parameter */
 295 #define IP6_MPORT_IN            0 /* Find lwkt port for incoming packets */
 296 #define IP6_MPORT_OUT           1 /* Find lwkt port for outgoing packets */
 297
 298 extern struct   ip6stat ip6stat;        /* statistics */
 299 extern u_int32_t ip6_id;                /* fragment identifier */
 300 extern int      ip6_minhlim;            /* minimum hop limit */
 301 extern int      ip6_defhlim;            /* default hop limit */
 302 extern int      ip6_defmcasthlim;       /* default multicast hop limit */
 303 extern int      ip6_forwarding;         /* act as router? */
 304 extern int      ip6_forward_srcrt;      /* forward src-routed? */
 305 extern int      ip6_gif_hlim;           /* Hop limit for gif encap packet */
 306 extern int      ip6_use_deprecated;     /* allow deprecated addr as source */
 307 extern int      ip6_rr_prune;           /* router renumbering prefix
 308                                          * walk list every 5 sec.    */
 309
 310 extern struct socket *ip6_mrouter;      /* multicast routing daemon */
 311 extern int      ip6_sendredirects;      /* send IP redirects when forwarding? */
 312 extern int      ip6_maxfragpackets; /* Maximum packets in reassembly queue */
 313 extern int      ip6_maxfrags;   /* Maximum fragments in reassembly queue */
 314 extern int      ip6_sourcecheck;        /* Verify source interface */
 315 extern int      ip6_sourcecheck_interval; /* Interval between log messages */
 316 extern int      ip6_accept_rtadv;       /* Acts as a host not a router */
 317 extern int      ip6_keepfaith;          /* Firewall Aided Internet Translator */
 318 extern int      ip6_log_interval;
 319 extern time_t   ip6_log_time;
 320 extern int      ip6_hdrnestlimit; /* upper limit of # of extension headers */
 321 extern int      ip6_dad_count;          /* DupAddrDetectionTransmits */
 322
 323 extern u_int32_t ip6_flow_seq;
 324 extern int ip6_auto_flowlabel;
 325 extern int ip6_auto_linklocal;
 326
 327 extern int   ip6_anonportmin;           /* minimum ephemeral port */
 328 extern int   ip6_anonportmax;           /* maximum ephemeral port */
 329 extern int   ip6_lowportmin;            /* minimum reserved port */
 330 extern int   ip6_lowportmax;            /* maximum reserved port */
 331
 332 extern int      ip6_use_tempaddr; /* whether to use temporary addresses. */
 333
 334 extern struct pfil_head inet6_pfil_hook;
 335
 336 extern struct   pr_usrreqs rip6_usrreqs;
 337
 338 struct proc;
 339 struct inpcb;
 340 struct sockopt;
 341 struct in6_ifaddr;
 342 struct ip6_hdr;
 343 union netmsg;
 344
 345 void    icmp6_ctloutput (union netmsg *);
 346
 347 void    ip6_init (void);
 348 void    ip6intr (void);
 349 struct in6_ifaddr *ip6_getdstifaddr (struct mbuf *);
 350 void    ip6_freepcbopts (struct ip6_pktopts *);
 351 void    ip6_freemoptions (struct ip6_moptions *);
 352 int     ip6_unknown_opt (u_int8_t *, struct mbuf *, int);
 353 char *  ip6_get_prevhdr (struct mbuf *, int);
 354 int     ip6_nexthdr (struct mbuf *, int, int, int *);
 355 int     ip6_lasthdr (struct mbuf *, int, int, int *);
 356
 357 struct ip6aux *ip6_addaux (struct mbuf *);
 358 struct ip6aux *ip6_findaux (struct mbuf *);
 359 void    ip6_delaux (struct mbuf *);
 360
 361 int     ip6_mforward (struct ip6_hdr *, struct ifnet *, struct mbuf *);
 362 int     ip6_process_hopopts (struct mbuf *, u_int8_t *, int, u_int32_t *,
 363                                  u_int32_t *);
 364 void    ip6_savecontrol (struct inpcb *, struct mbuf **, struct ip6_hdr *,
 365                              struct mbuf *);
 366 void    ip6_notify_pmtu (struct inpcb *, struct sockaddr_in6 *,
 367                              u_int32_t *);
 368 int     ip6_sysctl (int *, u_int, void *, size_t *, void *, size_t);
 369
 370 void    ip6_forward (struct mbuf *, int);
 371
 372 void    ip6_mloopback (struct ifnet *, struct mbuf *, struct sockaddr_in6 *);
 373 int     ip6_output (struct mbuf *, struct ip6_pktopts *,
 374                         struct route_in6 *,
 375                         int,
 376                         struct ip6_moptions *, struct ifnet **,
 377                         struct inpcb *);
 378 void    ip6_ctloutput_dispatch(netmsg_t msg);
 379 int     ip6_ctloutput (struct socket *, struct sockopt *);
 380 int     ip6_raw_ctloutput (struct socket *, struct sockopt *);
 381 void    init_ip6pktopts (struct ip6_pktopts *);
 382 int
 383 ip6_setpktoptions(struct mbuf *, struct ip6_pktopts *,
 384     struct ip6_pktopts *, int , int);
 385 void    ip6_clearpktopts (struct ip6_pktopts *, int);
 386 struct ip6_pktopts *ip6_copypktopts (struct ip6_pktopts *, int);
 387 int     ip6_optlen (struct inpcb *);
 388
 389 int     route6_input (struct mbuf **, int *, int);
 390
 391 void    frag6_init (void);
 392 int     frag6_input (struct mbuf **, int *, int);
 393 void    frag6_slowtimo (void);
 394 void    frag6_drain (void);
 395
 396 void    rip6_init (void);
 397 int     rip6_input (struct mbuf **, int *, int);
 398 void    rip6_ctlinput (union netmsg *);
 399 void    rip6_ctloutput (union netmsg *);
 400 int     rip6_output (struct mbuf *, struct socket *, ...);
 401 int     rip6_usrreq (struct socket *,
 402             int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
 403
 404 int     dest6_input (struct mbuf **, int *, int);
 405 int     none_input (struct mbuf **, int *, int);
 406 #endif /* _KERNEL */
 407
 408 #endif /* !_NETINET6_IP6_VAR_H_ */