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