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 1.6 2005/02/01 16:09:37 hrs 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 #include <sys/queue.h>
  43 #include <sys/callout.h>
  44
  45 struct  llinfo_nd6 {
  46         struct  llinfo_nd6 *ln_next;
  47         struct  llinfo_nd6 *ln_prev;
  48         struct  rtentry *ln_rt;
  49         struct  mbuf *ln_hold;  /* last packet until resolved/timeout */
  50         long    ln_asked;       /* number of queries already sent for this addr */
  51         u_long  ln_expire;      /* lifetime for NDP state transition */
  52         short   ln_state;       /* reachability state */
  53         short   ln_router;      /* 2^0: ND6 router bit */
  54         int     ln_byhint;      /* # of times we made it reachable by UL hint */
  55 };
  56
  57 #define ND6_LLINFO_NOSTATE      -2
  58 /*
  59  * We don't need the WAITDELETE state any more, but we keep the definition
  60  * in a comment line instead of removing it. This is necessary to avoid
  61  * unintentionally reusing the value for another purpose, which might
  62  * affect backward compatibility with old applications.
  63  * (20000711 jinmei@kame.net)
  64  */
  65 /* #define ND6_LLINFO_WAITDELETE        -1 */
  66 #define ND6_LLINFO_INCOMPLETE   0
  67 #define ND6_LLINFO_REACHABLE    1
  68 #define ND6_LLINFO_STALE        2
  69 #define ND6_LLINFO_DELAY        3
  70 #define ND6_LLINFO_PROBE        4
  71
  72 #define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
  73
  74 struct nd_ifinfo {
  75         u_int32_t linkmtu;              /* LinkMTU */
  76         u_int32_t maxmtu;               /* Upper bound of LinkMTU */
  77         u_int32_t basereachable;        /* BaseReachableTime */
  78         u_int32_t reachable;            /* Reachable Time */
  79         u_int32_t retrans;              /* Retrans Timer */
  80         u_int32_t flags;                /* Flags */
  81         int recalctm;                   /* BaseReacable re-calculation timer */
  82         u_int8_t chlim;                 /* CurHopLimit */
  83         u_int8_t receivedra;
  84         u_int8_t initialized;           /* Flag to see the entry is initialized */
  85         /* the following 3 members are for privacy extension for addrconf */
  86         u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
  87         u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
  88         u_int8_t randomid[8];   /* current random ID */
  89 };
  90
  91 #define ND6_IFF_PERFORMNUD      0x1
  92 #define ND6_IFF_ACCEPT_RTADV    0x2
  93
  94 #ifdef _KERNEL
  95 #define ND_IFINFO(ifp) \
  96         (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
  97 #define IN6_LINKMTU(ifp) \
  98         ((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
  99                 ? ND_IFINFO(ifp)->linkmtu \
 100                 : ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
 101                         ? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
 102 #endif
 103
 104 struct in6_nbrinfo {
 105         char ifname[IFNAMSIZ];  /* if name, e.g. "en0" */
 106         struct in6_addr addr;   /* IPv6 address of the neighbor */
 107         long    asked;          /* number of queries already sent for this addr */
 108         int     isrouter;       /* if it acts as a router */
 109         int     state;          /* reachability state */
 110         int     expire;         /* lifetime for NDP state transition */
 111 };
 112
 113 #define DRLSTSIZ 10
 114 #define PRLSTSIZ 10
 115 struct  in6_drlist {
 116         char ifname[IFNAMSIZ];
 117         struct {
 118                 struct  in6_addr rtaddr;
 119                 u_char  flags;
 120                 u_short rtlifetime;
 121                 u_long  expire;
 122                 u_short if_index;
 123         } defrouter[DRLSTSIZ];
 124 };
 125
 126 struct  in6_defrouter {
 127         struct  sockaddr_in6 rtaddr;
 128         u_char  flags;
 129         u_short rtlifetime;
 130         u_long  expire;
 131         u_short if_index;
 132 };
 133
 134 struct  in6_prlist {
 135         char ifname[IFNAMSIZ];
 136         struct {
 137                 struct  in6_addr prefix;
 138                 struct prf_ra raflags;
 139                 u_char  prefixlen;
 140                 u_char  origin;
 141                 u_int32_t vltime;
 142                 u_int32_t pltime;
 143                 time_t expire;
 144                 u_short if_index;
 145                 u_short advrtrs; /* number of advertisement routers */
 146                 struct  in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
 147         } prefix[PRLSTSIZ];
 148 };
 149
 150 struct in6_prefix {
 151         struct  sockaddr_in6 prefix;
 152         struct prf_ra raflags;
 153         u_char  prefixlen;
 154         u_char  origin;
 155         u_long  vltime;
 156         u_long  pltime;
 157         u_long  expire;
 158         u_int32_t flags;
 159         int refcnt;
 160         u_short if_index;
 161         u_short advrtrs; /* number of advertisement routers */
 162         /* struct sockaddr_in6 advrtr[] */
 163 };
 164
 165 #ifdef _KERNEL
 166 struct  in6_ondireq {
 167         char ifname[IFNAMSIZ];
 168         struct {
 169                 u_int32_t linkmtu;      /* LinkMTU */
 170                 u_int32_t maxmtu;       /* Upper bound of LinkMTU */
 171                 u_int32_t basereachable; /* BaseReachableTime */
 172                 u_int32_t reachable;    /* Reachable Time */
 173                 u_int32_t retrans;      /* Retrans Timer */
 174                 u_int32_t flags;        /* Flags */
 175                 int recalctm;           /* BaseReacable re-calculation timer */
 176                 u_int8_t chlim;         /* CurHopLimit */
 177                 u_int8_t receivedra;
 178         } ndi;
 179 };
 180 #endif
 181
 182 struct  in6_ndireq {
 183         char ifname[IFNAMSIZ];
 184         struct nd_ifinfo ndi;
 185 };
 186
 187 struct  in6_ndifreq {
 188         char ifname[IFNAMSIZ];
 189         u_long ifindex;
 190 };
 191
 192 /* Prefix status */
 193 #define NDPRF_ONLINK            0x1
 194 #define NDPRF_DETACHED          0x2
 195
 196 /* protocol constants */
 197 #define MAX_RTR_SOLICITATION_DELAY      1       /* 1sec */
 198 #define RTR_SOLICITATION_INTERVAL       4       /* 4sec */
 199 #define MAX_RTR_SOLICITATIONS           3
 200
 201 #define ND6_INFINITE_LIFETIME           0xffffffff
 202
 203 #ifdef _KERNEL
 204 /* node constants */
 205 #define MAX_REACHABLE_TIME              3600000 /* msec */
 206 #define REACHABLE_TIME                  30000   /* msec */
 207 #define RETRANS_TIMER                   1000    /* msec */
 208 #define MIN_RANDOM_FACTOR               512     /* 1024 * 0.5 */
 209 #define MAX_RANDOM_FACTOR               1536    /* 1024 * 1.5 */
 210 #define DEF_TEMP_VALID_LIFETIME         604800  /* 1 week */
 211 #define DEF_TEMP_PREFERRED_LIFETIME     86400   /* 1 day */
 212 #define TEMPADDR_REGEN_ADVANCE          5       /* sec */
 213 #define MAX_TEMP_DESYNC_FACTOR          600     /* 10 min */
 214 #define ND_COMPUTE_RTIME(x) \
 215                 (((MIN_RANDOM_FACTOR * (x >> 10)) + (random() & \
 216                 ((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
 217
 218 TAILQ_HEAD(nd_drhead, nd_defrouter);
 219 struct  nd_defrouter {
 220         TAILQ_ENTRY(nd_defrouter) dr_entry;
 221         struct  in6_addr rtaddr;
 222         u_char  flags;          /* flags on RA message */
 223         u_short rtlifetime;
 224         u_long  expire;
 225         u_long  advint;         /* Mobile IPv6 addition (milliseconds) */
 226         u_long  advint_expire;  /* Mobile IPv6 addition */
 227         int     advints_lost;   /* Mobile IPv6 addition */
 228         struct  ifnet *ifp;
 229 };
 230
 231 struct nd_prefix {
 232         struct ifnet *ndpr_ifp;
 233         LIST_ENTRY(nd_prefix) ndpr_entry;
 234         struct sockaddr_in6 ndpr_prefix;        /* prefix */
 235         struct in6_addr ndpr_mask; /* netmask derived from the prefix */
 236         struct in6_addr ndpr_addr; /* address that is derived from the prefix */
 237         u_int32_t ndpr_vltime;  /* advertised valid lifetime */
 238         u_int32_t ndpr_pltime;  /* advertised preferred lifetime */
 239         time_t ndpr_expire;     /* expiration time of the prefix */
 240         time_t ndpr_preferred;  /* preferred time of the prefix */
 241         struct prf_ra ndpr_flags;
 242         u_int32_t ndpr_stateflags; /* actual state flags */
 243         /* list of routers that advertise the prefix: */
 244         LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
 245         u_char  ndpr_plen;
 246         int     ndpr_refcnt;    /* reference couter from addresses */
 247 };
 248
 249 #define ndpr_next               ndpr_entry.le_next
 250
 251 #define ndpr_raf                ndpr_flags
 252 #define ndpr_raf_onlink         ndpr_flags.onlink
 253 #define ndpr_raf_auto           ndpr_flags.autonomous
 254
 255 /*
 256  * We keep expired prefix for certain amount of time, for validation purposes.
 257  * 1800s = MaxRtrAdvInterval
 258  */
 259 #define NDPR_KEEP_EXPIRED       (1800 * 2)
 260
 261 /*
 262  * Message format for use in obtaining information about prefixes
 263  * from inet6 sysctl function
 264  */
 265 struct inet6_ndpr_msghdr {
 266         u_short inpm_msglen;    /* to skip over non-understood messages */
 267         u_char  inpm_version;   /* future binary compatibility */
 268         u_char  inpm_type;      /* message type */
 269         struct in6_addr inpm_prefix;
 270         u_long  prm_vltim;
 271         u_long  prm_pltime;
 272         u_long  prm_expire;
 273         u_long  prm_preferred;
 274         struct in6_prflags prm_flags;
 275         u_short prm_index;      /* index for associated ifp */
 276         u_char  prm_plen;       /* length of prefix in bits */
 277 };
 278
 279 #define prm_raf_onlink          prm_flags.prf_ra.onlink
 280 #define prm_raf_auto            prm_flags.prf_ra.autonomous
 281
 282 #define prm_statef_onlink       prm_flags.prf_state.onlink
 283
 284 #define prm_rrf_decrvalid       prm_flags.prf_rr.decrvalid
 285 #define prm_rrf_decrprefd       prm_flags.prf_rr.decrprefd
 286
 287 #define ifpr2ndpr(ifpr) ((struct nd_prefix *)(ifpr))
 288 #define ndpr2ifpr(ndpr) ((struct ifprefix *)(ndpr))
 289
 290 struct nd_pfxrouter {
 291         LIST_ENTRY(nd_pfxrouter) pfr_entry;
 292 #define pfr_next pfr_entry.le_next
 293         struct nd_defrouter *router;
 294 };
 295
 296 LIST_HEAD(nd_prhead, nd_prefix);
 297
 298 /* nd6.c */
 299 extern int nd6_prune;
 300 extern int nd6_delay;
 301 extern int nd6_umaxtries;
 302 extern int nd6_mmaxtries;
 303 extern int nd6_useloopback;
 304 extern int nd6_maxnudhint;
 305 extern int nd6_gctimer;
 306 extern struct llinfo_nd6 llinfo_nd6;
 307 extern struct nd_ifinfo *nd_ifinfo;
 308 extern struct nd_drhead nd_defrouter;
 309 extern struct nd_prhead nd_prefix;
 310 extern int nd6_debug;
 311
 312 #define nd6log(x)       do { if (nd6_debug) log x; } while (0)
 313
 314 extern struct callout nd6_timer_ch;
 315
 316 /* nd6_rtr.c */
 317 extern int nd6_defifindex;
 318 extern int ip6_desync_factor;   /* seconds */
 319 extern u_int32_t ip6_temp_preferred_lifetime; /* seconds */
 320 extern u_int32_t ip6_temp_valid_lifetime; /* seconds */
 321 extern int ip6_temp_regen_advance; /* seconds */
 322
 323 union nd_opts {
 324         struct nd_opt_hdr *nd_opt_array[9];     /* max = home agent info */
 325         struct {
 326                 struct nd_opt_hdr *zero;
 327                 struct nd_opt_hdr *src_lladdr;
 328                 struct nd_opt_hdr *tgt_lladdr;
 329                 struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
 330                 struct nd_opt_rd_hdr *rh;
 331                 struct nd_opt_mtu *mtu;
 332                 struct nd_opt_hdr *six;
 333                 struct nd_opt_advint *adv;
 334                 struct nd_opt_hai *hai;
 335                 struct nd_opt_hdr *search;      /* multiple opts */
 336                 struct nd_opt_hdr *last;        /* multiple opts */
 337                 int done;
 338                 struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
 339         } nd_opt_each;
 340 };
 341 #define nd_opts_src_lladdr      nd_opt_each.src_lladdr
 342 #define nd_opts_tgt_lladdr      nd_opt_each.tgt_lladdr
 343 #define nd_opts_pi              nd_opt_each.pi_beg
 344 #define nd_opts_pi_end          nd_opt_each.pi_end
 345 #define nd_opts_rh              nd_opt_each.rh
 346 #define nd_opts_mtu             nd_opt_each.mtu
 347 #define nd_opts_adv             nd_opt_each.adv
 348 #define nd_opts_hai             nd_opt_each.hai
 349 #define nd_opts_search          nd_opt_each.search
 350 #define nd_opts_last            nd_opt_each.last
 351 #define nd_opts_done            nd_opt_each.done
 352
 353 /* XXX: need nd6_var.h?? */
 354 /* nd6.c */
 355 void nd6_init (void);
 356 struct nd_ifinfo *nd6_ifattach (struct ifnet *);
 357 void nd6_ifdetach (struct nd_ifinfo *);
 358 int nd6_is_addr_neighbor (struct sockaddr_in6 *, struct ifnet *);
 359 void nd6_option_init (void *, int, union nd_opts *);
 360 struct nd_opt_hdr *nd6_option (union nd_opts *);
 361 int nd6_options (union nd_opts *);
 362 struct  rtentry *nd6_lookup (struct in6_addr *, int, struct ifnet *);
 363 void nd6_setmtu (struct ifnet *);
 364 void nd6_timer (void *);
 365 void nd6_purge (struct ifnet *);
 366 struct llinfo_nd6 *nd6_free (struct rtentry *);
 367 void nd6_nud_hint (struct rtentry *, struct in6_addr *, int);
 368 int nd6_resolve (struct ifnet *, struct rtentry *,
 369                      struct mbuf *, struct sockaddr *, u_char *);
 370 void nd6_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
 371 int nd6_ioctl (u_long, caddr_t, struct ifnet *);
 372 struct rtentry *nd6_cache_lladdr (struct ifnet *, struct in6_addr *,
 373         char *, int, int, int);
 374 int nd6_output (struct ifnet *, struct ifnet *, struct mbuf *,
 375                     struct sockaddr_in6 *, struct rtentry *);
 376 int nd6_storelladdr (struct ifnet *, struct rtentry *, struct mbuf *,
 377                          struct sockaddr *, u_char *);
 378 int nd6_need_cache (struct ifnet *);
 379
 380 /* nd6_nbr.c */
 381 void nd6_na_input (struct mbuf *, int, int);
 382 void nd6_na_output (struct ifnet *, const struct in6_addr *,
 383         const struct in6_addr *, u_long, int, struct sockaddr *);
 384 void nd6_ns_input (struct mbuf *, int, int);
 385 void nd6_ns_output (struct ifnet *, const struct in6_addr *,
 386         const struct in6_addr *, struct llinfo_nd6 *, int);
 387 caddr_t nd6_ifptomac (struct ifnet *);
 388 void nd6_dad_start (struct ifaddr *, int *);
 389 void nd6_dad_stop (struct ifaddr *);
 390 void nd6_dad_duplicated (struct ifaddr *);
 391
 392 /* nd6_rtr.c */
 393 void nd6_rs_input (struct mbuf *, int, int);
 394 void nd6_ra_input (struct mbuf *, int, int);
 395 void prelist_del (struct nd_prefix *);
 396 void defrouter_addreq (struct nd_defrouter *);
 397 void defrouter_delreq (struct nd_defrouter *, int);
 398 void defrouter_select (void);
 399 void defrtrlist_del (struct nd_defrouter *);
 400 void prelist_remove (struct nd_prefix *);
 401 int prelist_update (struct nd_prefix *, struct nd_defrouter *,
 402                         struct mbuf *);
 403 int nd6_prelist_add (struct nd_prefix *, struct nd_defrouter *,
 404                          struct nd_prefix **);
 405 int nd6_prefix_onlink (struct nd_prefix *);
 406 int nd6_prefix_offlink (struct nd_prefix *);
 407 void pfxlist_onlink_check (void);
 408 struct nd_defrouter *defrouter_lookup (struct in6_addr *,
 409                                            struct ifnet *);
 410 struct nd_prefix *nd6_prefix_lookup (struct nd_prefix *);
 411 int in6_init_prefix_ltimes (struct nd_prefix *ndpr);
 412 void rt6_flush (struct in6_addr *, struct ifnet *);
 413 int nd6_setdefaultiface (int);
 414 int in6_tmpifadd (const struct in6_ifaddr *, int);
 415
 416 #endif /* _KERNEL */
 417
 418 #endif /* _NETINET6_ND6_H_ */