sys/netinet6/nd6.h

   1 /*      $FreeBSD: src/sys/netinet6/nd6.h,v 1.2.2.5 2002/04/28 05:40:27 suz Exp $        */
   2 /*      $DragonFly: src/sys/netinet6/nd6.h,v 1.8 2006/09/03 18:52:29 dillon Exp $       */
   3 /*      $KAME: nd6.h,v 1.76 2001/12/18 02:10:31 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 #ifndef _NETINET6_ND6_H_
  35 #define _NETINET6_ND6_H_
  36
  37 /* see net/route.h, or net/if_inarp.h */
  38 #ifndef RTF_ANNOUNCE
  39 #define RTF_ANNOUNCE    RTF_PROTO2
  40 #endif
  41
  42 #ifndef _SYS_TYPES_H_
  43 #include <sys/types.h>
  44 #endif
  45 #ifndef _SYS_QUEUE_H_
  46 #include <sys/queue.h>
  47 #endif
  48 #ifndef _SYS_CALLOUT_H_
  49 #include <sys/callout.h>
  50 #endif
  51 #ifndef _NET_IF_H_
  52 #include <net/if.h>
  53 #endif
  54 #ifndef _NETINET_IN_H_
  55 #include <netinet/in.h>
  56 #endif
  57 #ifndef _NETINET6_IN6_VAR_H_
  58 #include <netinet6/in6_var.h>
  59 #endif
  60 #ifndef _SYS_MUTEX_H_
  61 #include <sys/mutex.h>
  62 #endif
  63
  64 struct  llinfo_nd6 {
  65         struct  llinfo_nd6 *ln_next;
  66         struct  llinfo_nd6 *ln_prev;
  67         struct  rtentry *ln_rt;
  68         struct  mbuf *ln_hold;  /* last packet until resolved/timeout */
  69         long    ln_asked;       /* number of queries already sent for this addr */
  70         u_long  ln_expire;      /* lifetime for NDP state transition */
  71         short   ln_state;       /* reachability state */
  72         short   ln_router;      /* 2^0: ND6 router bit */
  73         int     ln_byhint;      /* # of times we made it reachable by UL hint */
  74 };
  75
  76 #define ND6_LLINFO_NOSTATE      -2
  77 #define ND6_LLINFO_WAITDELETE   -1
  78 #define ND6_LLINFO_INCOMPLETE   0
  79 #define ND6_LLINFO_REACHABLE    1
  80 #define ND6_LLINFO_STALE        2
  81 #define ND6_LLINFO_DELAY        3
  82 #define ND6_LLINFO_PROBE        4
  83
  84 #define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
  85
  86 struct nd_ifinfo {
  87         u_int32_t linkmtu;              /* LinkMTU */
  88         u_int32_t maxmtu;               /* Upper bound of LinkMTU */
  89         u_int32_t basereachable;        /* BaseReachableTime */
  90         u_int32_t reachable;            /* Reachable Time */
  91         u_int32_t retrans;              /* Retrans Timer */
  92         u_int32_t flags;                /* Flags (ND6_IFF_*) */
  93         int recalctm;                   /* BaseReacable re-calculation timer */
  94         u_int8_t chlim;                 /* CurHopLimit */
  95         u_int8_t reserved;              /* reserved 0 */
  96         u_int8_t initialized;           /* Flag to see the entry is initialized */
  97         /* the following 3 members are for privacy extension for addrconf */
  98         u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
  99         u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
 100         u_int8_t randomid[8];   /* current random ID */
 101 };
 102
 103 #define ND6_IFF_PERFORMNUD      0x1
 104 #define ND6_IFF_ACCEPT_RTADV    0x2
 105 #define ND6_IFF_AUTO_LINKLOCAL  0x4
 106 #define ND6_IFF_NO_DAD          0x8
 107
 108 #ifdef _KERNEL
 109 #define ND_IFINFO(ifp) \
 110         (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
 111 #define IN6_LINKMTU(ifp) \
 112         ((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
 113                 ? ND_IFINFO(ifp)->linkmtu \
 114                 : ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
 115                         ? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
 116 #endif
 117
 118 struct in6_nbrinfo {
 119         char ifname[IFNAMSIZ];  /* if name, e.g. "en0" */
 120         struct in6_addr addr;   /* IPv6 address of the neighbor */
 121         long    asked;          /* number of queries already sent for this addr */
 122         int     isrouter;       /* if it acts as a router */
 123         int     state;          /* reachability state */
 124         int     expire;         /* lifetime for NDP state transition */
 125 };
 126
 127 #define DRLSTSIZ 10
 128 #define PRLSTSIZ 10
 129 struct  in6_drlist {
 130         char ifname[IFNAMSIZ];
 131         struct {
 132                 struct  in6_addr rtaddr;
 133                 u_char  flags;
 134                 u_short rtlifetime;
 135                 u_long  expire;
 136                 u_short if_index;
 137         } defrouter[DRLSTSIZ];
 138 };
 139
 140 struct  in6_defrouter {
 141         struct  sockaddr_in6 rtaddr;
 142         u_char  flags;
 143         u_short rtlifetime;
 144         u_long  expire;
 145         u_short if_index;
 146 };
 147
 148 struct  in6_prlist {
 149         char ifname[IFNAMSIZ];
 150         struct {
 151                 struct  in6_addr prefix;
 152                 struct prf_ra raflags;
 153                 u_char  prefixlen;
 154                 u_char  origin;
 155                 u_int32_t vltime;
 156                 u_int32_t pltime;
 157                 time_t expire;
 158                 u_short if_index;
 159                 u_short advrtrs; /* number of advertisement routers */
 160                 struct  in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
 161         } prefix[PRLSTSIZ];
 162 };
 163
 164 struct in6_prefix {
 165         struct  sockaddr_in6 prefix;
 166         struct prf_ra raflags;
 167         u_char  prefixlen;
 168         u_char  origin;
 169         u_long  vltime;
 170         u_long  pltime;
 171         u_long  expire;
 172         u_int32_t flags;
 173         int refcnt;
 174         u_short if_index;
 175         u_short advrtrs; /* number of advertisement routers */
 176         /* struct sockaddr_in6 advrtr[] */
 177 };
 178
 179 #ifdef _KERNEL
 180 struct  in6_ondireq {
 181         char ifname[IFNAMSIZ];
 182         struct {
 183                 u_int32_t linkmtu;      /* LinkMTU */
 184                 u_int32_t maxmtu;       /* Upper bound of LinkMTU */
 185                 u_int32_t basereachable; /* BaseReachableTime */
 186                 u_int32_t reachable;    /* Reachable Time */
 187                 u_int32_t retrans;      /* Retrans Timer */
 188                 u_int32_t flags;        /* Flags */
 189                 int recalctm;           /* BaseReacable re-calculation timer */
 190                 u_int8_t chlim;         /* CurHopLimit */
 191                 u_int8_t receivedra;
 192         } ndi;
 193 };
 194 #endif
 195
 196 struct  in6_ndireq {
 197         char ifname[IFNAMSIZ];
 198         struct nd_ifinfo ndi;
 199 };
 200
 201 struct  in6_ndifreq {
 202         char ifname[IFNAMSIZ];
 203         u_long ifindex;
 204 };
 205
 206 /* Prefix status */
 207 #define NDPRF_ONLINK            0x1
 208 #define NDPRF_DETACHED          0x2
 209
 210 /* protocol constants */
 211 #define MAX_RTR_SOLICITATION_DELAY      1       /* 1sec */
 212 #define RTR_SOLICITATION_INTERVAL       4       /* 4sec */
 213 #define MAX_RTR_SOLICITATIONS           3
 214
 215 #define ND6_INFINITE_LIFETIME           0xffffffff
 216
 217 #ifdef _KERNEL
 218 /* node constants */
 219 #define MAX_REACHABLE_TIME              3600000 /* msec */
 220 #define REACHABLE_TIME                  30000   /* msec */
 221 #define RETRANS_TIMER                   1000    /* msec */
 222 #define MIN_RANDOM_FACTOR               512     /* 1024 * 0.5 */
 223 #define MAX_RANDOM_FACTOR               1536    /* 1024 * 1.5 */
 224 #define DEF_TEMP_VALID_LIFETIME         604800  /* 1 week */
 225 #define DEF_TEMP_PREFERRED_LIFETIME     86400   /* 1 day */
 226 #define TEMPADDR_REGEN_ADVANCE          5       /* sec */
 227 #define MAX_TEMP_DESYNC_FACTOR          600     /* 10 min */
 228 #define ND_COMPUTE_RTIME(x) \
 229                 (((MIN_RANDOM_FACTOR * (x >> 10)) + (krandom() & \
 230                 ((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
 231
 232 TAILQ_HEAD(nd_drhead, nd_defrouter);
 233 struct  nd_defrouter {
 234         TAILQ_ENTRY(nd_defrouter) dr_entry;
 235         struct  in6_addr rtaddr;
 236         u_char  flags;          /* flags on RA message */
 237         u_short rtlifetime;
 238         u_long  expire;
 239         u_long  advint;         /* Mobile IPv6 addition (milliseconds) */
 240         u_long  advint_expire;  /* Mobile IPv6 addition */
 241         int     advints_lost;   /* Mobile IPv6 addition */
 242         struct  ifnet *ifp;
 243 };
 244
 245 struct nd_prefix {
 246         struct ifnet *ndpr_ifp;
 247         LIST_ENTRY(nd_prefix) ndpr_entry;
 248         struct sockaddr_in6 ndpr_prefix;        /* prefix */
 249         struct in6_addr ndpr_mask; /* netmask derived from the prefix */
 250         struct in6_addr ndpr_addr; /* address that is derived from the prefix */
 251         u_int32_t ndpr_vltime;  /* advertised valid lifetime */
 252         u_int32_t ndpr_pltime;  /* advertised preferred lifetime */
 253         time_t ndpr_expire;     /* expiration time of the prefix */
 254         time_t ndpr_preferred;  /* preferred time of the prefix */
 255         struct prf_ra ndpr_flags;
 256         u_int32_t ndpr_stateflags; /* actual state flags */
 257         /* list of routers that advertise the prefix: */
 258         LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
 259         u_char  ndpr_plen;
 260         int     ndpr_refcnt;    /* reference couter from addresses */
 261 };
 262
 263 #define ndpr_next               ndpr_entry.le_next
 264
 265 #define ndpr_raf                ndpr_flags
 266 #define ndpr_raf_onlink         ndpr_flags.onlink
 267 #define ndpr_raf_auto           ndpr_flags.autonomous
 268
 269 /*
 270  * We keep expired prefix for certain amount of time, for validation purposes.
 271  * 1800s = MaxRtrAdvInterval
 272  */
 273 #define NDPR_KEEP_EXPIRED       (1800 * 2)
 274
 275 /*
 276  * Message format for use in obtaining information about prefixes
 277  * from inet6 sysctl function
 278  */
 279 struct inet6_ndpr_msghdr {
 280         u_short inpm_msglen;    /* to skip over non-understood messages */
 281         u_char  inpm_version;   /* future binary compatibility */
 282         u_char  inpm_type;      /* message type */
 283         struct in6_addr inpm_prefix;
 284         u_long  prm_vltim;
 285         u_long  prm_pltime;
 286         u_long  prm_expire;
 287         u_long  prm_preferred;
 288         struct in6_prflags prm_flags;
 289         u_short prm_index;      /* index for associated ifp */
 290         u_char  prm_plen;       /* length of prefix in bits */
 291 };
 292
 293 #define prm_raf_onlink          prm_flags.prf_ra.onlink
 294 #define prm_raf_auto            prm_flags.prf_ra.autonomous
 295
 296 #define prm_statef_onlink       prm_flags.prf_state.onlink
 297
 298 #define prm_rrf_decrvalid       prm_flags.prf_rr.decrvalid
 299 #define prm_rrf_decrprefd       prm_flags.prf_rr.decrprefd
 300
 301 #define ifpr2ndpr(ifpr) ((struct nd_prefix *)(ifpr))
 302
 303 struct nd_pfxrouter {
 304         LIST_ENTRY(nd_pfxrouter) pfr_entry;
 305 #define pfr_next pfr_entry.le_next
 306         struct nd_defrouter *router;
 307 };
 308
 309 LIST_HEAD(nd_prhead, nd_prefix);
 310
 311 /* nd6.c */
 312 extern int nd6_prune;
 313 extern int nd6_delay;
 314 extern int nd6_umaxtries;
 315 extern int nd6_mmaxtries;
 316 extern int nd6_useloopback;
 317 extern int nd6_maxnudhint;
 318 extern int nd6_gctimer;
 319 extern struct llinfo_nd6 llinfo_nd6;
 320 extern struct nd_ifinfo *nd_ifinfo;
 321 extern struct nd_drhead nd_defrouter;
 322 extern struct nd_prhead nd_prefix;
 323 extern struct mtx nd6_mtx;
 324 extern int nd6_debug;
 325 extern int nd6_onlink_ns_rfc4861;
 326
 327 #define nd6log(x)       do { if (nd6_debug) log x; } while (0)
 328
 329 /* nd6_rtr.c */
 330 extern int nd6_defifindex;
 331 extern int ip6_desync_factor;   /* seconds */
 332 extern u_int32_t ip6_temp_preferred_lifetime; /* seconds */
 333 extern u_int32_t ip6_temp_valid_lifetime; /* seconds */
 334 extern int ip6_temp_regen_advance; /* seconds */
 335
 336 union nd_opts {
 337         struct nd_opt_hdr *nd_opt_array[9];     /* max = home agent info */
 338         struct {
 339                 struct nd_opt_hdr *zero;
 340                 struct nd_opt_hdr *src_lladdr;
 341                 struct nd_opt_hdr *tgt_lladdr;
 342                 struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
 343                 struct nd_opt_rd_hdr *rh;
 344                 struct nd_opt_mtu *mtu;
 345                 struct nd_opt_hdr *six;
 346                 struct nd_opt_advint *adv;
 347                 struct nd_opt_hai *hai;
 348                 struct nd_opt_hdr *search;      /* multiple opts */
 349                 struct nd_opt_hdr *last;        /* multiple opts */
 350                 int done;
 351                 struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
 352         } nd_opt_each;
 353 };
 354 #define nd_opts_src_lladdr      nd_opt_each.src_lladdr
 355 #define nd_opts_tgt_lladdr      nd_opt_each.tgt_lladdr
 356 #define nd_opts_pi              nd_opt_each.pi_beg
 357 #define nd_opts_pi_end          nd_opt_each.pi_end
 358 #define nd_opts_rh              nd_opt_each.rh
 359 #define nd_opts_mtu             nd_opt_each.mtu
 360 #define nd_opts_adv             nd_opt_each.adv
 361 #define nd_opts_hai             nd_opt_each.hai
 362 #define nd_opts_search          nd_opt_each.search
 363 #define nd_opts_last            nd_opt_each.last
 364 #define nd_opts_done            nd_opt_each.done
 365
 366 /* XXX: need nd6_var.h?? */
 367 /* nd6.c */
 368 void nd6_init (void);
 369 void nd6_timer_init(void);
 370 struct nd_ifinfo *nd6_ifattach (struct ifnet *);
 371 void nd6_ifdetach (struct nd_ifinfo *);
 372 int nd6_is_addr_neighbor (struct sockaddr_in6 *, struct ifnet *);
 373 void nd6_option_init (void *, int, union nd_opts *);
 374 struct nd_opt_hdr *nd6_option (union nd_opts *);
 375 int nd6_options (union nd_opts *);
 376 struct  rtentry *nd6_lookup (struct in6_addr *, int, struct ifnet *);
 377 void nd6_setmtu (struct ifnet *);
 378 void nd6_purge (struct ifnet *);
 379 struct llinfo_nd6 *nd6_free (struct rtentry *);
 380 void nd6_nud_hint (struct rtentry *, struct in6_addr *, int);
 381 int nd6_resolve(struct ifnet *, struct rtentry *,
 382         struct mbuf *, struct sockaddr *, u_char *);
 383 void nd6_rtrequest (int, struct rtentry *);
 384 int nd6_ioctl (u_long, caddr_t, struct ifnet *);
 385 struct rtentry *nd6_cache_lladdr (struct ifnet *, struct in6_addr *,
 386         char *, int, int, int);
 387 int nd6_output(struct ifnet *, struct ifnet *, struct mbuf *,
 388         struct sockaddr_in6 *, struct rtentry *);
 389 int nd6_need_cache (struct ifnet *);
 390
 391 /* nd6_nbr.c */
 392 void nd6_na_input (struct mbuf *, int, int);
 393 void nd6_na_output (struct ifnet *, const struct in6_addr *,
 394         const struct in6_addr *, u_long, int, struct sockaddr *);
 395 void nd6_ns_input (struct mbuf *, int, int);
 396 void nd6_ns_output (struct ifnet *, const struct in6_addr *,
 397         const struct in6_addr *, struct llinfo_nd6 *, int);
 398 caddr_t nd6_ifptomac (struct ifnet *);
 399 void nd6_dad_start (struct ifaddr *, int *);
 400 void nd6_dad_stop (struct ifaddr *);
 401
 402 /* nd6_rtr.c */
 403 void nd6_rs_input (struct mbuf *, int, int);
 404 void nd6_ra_input (struct mbuf *, int, int);
 405 void prelist_del (struct nd_prefix *);
 406 void defrouter_addreq (struct nd_defrouter *);
 407 void defrouter_delreq (struct nd_defrouter *, int);
 408 void defrouter_select (void);
 409 void defrtrlist_del (struct nd_defrouter *);
 410 void prelist_remove (struct nd_prefix *);
 411 int prelist_update(struct nd_prefix *, struct nd_defrouter *,
 412         struct mbuf *);
 413 int nd6_prelist_add(struct nd_prefix *, struct nd_defrouter *,
 414         struct nd_prefix **);
 415 int nd6_prefix_onlink (struct nd_prefix *);
 416 int nd6_prefix_offlink (struct nd_prefix *);
 417 void pfxlist_onlink_check (void);
 418 struct nd_defrouter *defrouter_lookup(struct in6_addr *, struct ifnet *);
 419 struct nd_prefix *nd6_prefix_lookup (struct nd_prefix *);
 420 int in6_init_prefix_ltimes (struct nd_prefix *);
 421 void rt6_flush (struct in6_addr *, struct ifnet *);
 422 int nd6_setdefaultiface (int);
 423 int in6_tmpifadd (const struct in6_ifaddr *, int);
 424
 425 #endif /* _KERNEL */
 426
 427 #endif /* _NETINET6_ND6_H_ */