The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/nd6.h

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    1 /*      $FreeBSD: releng/5.4/sys/netinet6/nd6.h 141090 2005-01-31 23:27:04Z imp $       */
    2 /*      $KAME: nd6.h,v 1.76 2001/12/18 02:10:31 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 #ifndef _NETINET6_ND6_H_
   34 #define _NETINET6_ND6_H_
   35 
   36 /* see net/route.h, or net/if_inarp.h */
   37 #ifndef RTF_ANNOUNCE
   38 #define RTF_ANNOUNCE    RTF_PROTO2
   39 #endif
   40 
   41 #include <sys/queue.h>
   42 #include <sys/callout.h>
   43 
   44 struct  llinfo_nd6 {
   45         struct  llinfo_nd6 *ln_next;
   46         struct  llinfo_nd6 *ln_prev;
   47         struct  rtentry *ln_rt;
   48         struct  mbuf *ln_hold;  /* last packet until resolved/timeout */
   49         long    ln_asked;       /* number of queries already sent for this addr */
   50         u_long  ln_expire;      /* lifetime for NDP state transition */
   51         short   ln_state;       /* reachability state */
   52         short   ln_router;      /* 2^0: ND6 router bit */
   53         int     ln_byhint;      /* # of times we made it reachable by UL hint */
   54 };
   55 
   56 #define ND6_LLINFO_NOSTATE      -2
   57 /*
   58  * We don't need the WAITDELETE state any more, but we keep the definition
   59  * in a comment line instead of removing it. This is necessary to avoid
   60  * unintentionally reusing the value for another purpose, which might
   61  * affect backward compatibility with old applications.
   62  * (20000711 jinmei@kame.net)
   63  */
   64 /* #define ND6_LLINFO_WAITDELETE        -1 */
   65 #define ND6_LLINFO_INCOMPLETE   0
   66 #define ND6_LLINFO_REACHABLE    1
   67 #define ND6_LLINFO_STALE        2
   68 #define ND6_LLINFO_DELAY        3
   69 #define ND6_LLINFO_PROBE        4
   70 
   71 #define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
   72 
   73 struct nd_ifinfo {
   74         u_int32_t linkmtu;              /* LinkMTU */
   75         u_int32_t maxmtu;               /* Upper bound of LinkMTU */
   76         u_int32_t basereachable;        /* BaseReachableTime */
   77         u_int32_t reachable;            /* Reachable Time */
   78         u_int32_t retrans;              /* Retrans Timer */
   79         u_int32_t flags;                /* Flags */
   80         int recalctm;                   /* BaseReacable re-calculation timer */
   81         u_int8_t chlim;                 /* CurHopLimit */
   82         u_int8_t initialized; /* Flag to see the entry is initialized */
   83         /* the following 3 members are for privacy extension for addrconf */
   84         u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
   85         u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
   86         u_int8_t randomid[8];   /* current random ID */
   87 };
   88 
   89 #define ND6_IFF_PERFORMNUD      0x1
   90 #define ND6_IFF_ACCEPT_RTADV    0x2
   91 
   92 #ifdef _KERNEL
   93 #define ND_IFINFO(ifp) \
   94         (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
   95 #define IN6_LINKMTU(ifp) \
   96         ((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
   97             ? ND_IFINFO(ifp)->linkmtu \
   98             : ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
   99                 ? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
  100 #endif
  101 
  102 struct in6_nbrinfo {
  103         char ifname[IFNAMSIZ];  /* if name, e.g. "en0" */
  104         struct in6_addr addr;   /* IPv6 address of the neighbor */
  105         long    asked;          /* number of queries already sent for this addr */
  106         int     isrouter;       /* if it acts as a router */
  107         int     state;          /* reachability state */
  108         int     expire;         /* lifetime for NDP state transition */
  109 };
  110 
  111 #define DRLSTSIZ 10
  112 #define PRLSTSIZ 10
  113 struct  in6_drlist {
  114         char ifname[IFNAMSIZ];
  115         struct {
  116                 struct  in6_addr rtaddr;
  117                 u_char  flags;
  118                 u_short rtlifetime;
  119                 u_long  expire;
  120                 u_short if_index;
  121         } defrouter[DRLSTSIZ];
  122 };
  123 
  124 struct  in6_defrouter {
  125         struct  sockaddr_in6 rtaddr;
  126         u_char  flags;
  127         u_short rtlifetime;
  128         u_long  expire;
  129         u_short if_index;
  130 };
  131 
  132 #ifdef _KERNEL
  133 struct  in6_oprlist {
  134         char ifname[IFNAMSIZ];
  135         struct {
  136                 struct  in6_addr prefix;
  137                 struct prf_ra raflags;
  138                 u_char  prefixlen;
  139                 u_char  origin;
  140                 u_long vltime;
  141                 u_long pltime;
  142                 u_long expire;
  143                 u_short if_index;
  144                 u_short advrtrs; /* number of advertisement routers */
  145                 struct  in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
  146         } prefix[PRLSTSIZ];
  147 };
  148 #endif
  149 
  150 struct  in6_prlist {
  151         char ifname[IFNAMSIZ];
  152         struct {
  153                 struct  in6_addr prefix;
  154                 struct prf_ra raflags;
  155                 u_char  prefixlen;
  156                 u_char  origin;
  157                 u_int32_t vltime;
  158                 u_int32_t pltime;
  159                 time_t expire;
  160                 u_short if_index;
  161                 u_short advrtrs; /* number of advertisement routers */
  162                 struct  in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
  163         } prefix[PRLSTSIZ];
  164 };
  165 
  166 struct in6_prefix {
  167         struct  sockaddr_in6 prefix;
  168         struct prf_ra raflags;
  169         u_char  prefixlen;
  170         u_char  origin;
  171         u_int32_t vltime;
  172         u_int32_t pltime;
  173         time_t expire;
  174         u_int32_t flags;
  175         int refcnt;
  176         u_short if_index;
  177         u_short advrtrs; /* number of advertisement routers */
  178         /* struct sockaddr_in6 advrtr[] */
  179 };
  180 
  181 #ifdef _KERNEL
  182 struct  in6_ondireq {
  183         char ifname[IFNAMSIZ];
  184         struct {
  185                 u_int32_t linkmtu;      /* LinkMTU */
  186                 u_int32_t maxmtu;       /* Upper bound of LinkMTU */
  187                 u_int32_t basereachable; /* BaseReachableTime */
  188                 u_int32_t reachable;    /* Reachable Time */
  189                 u_int32_t retrans;      /* Retrans Timer */
  190                 u_int32_t flags;        /* Flags */
  191                 int recalctm;           /* BaseReacable re-calculation timer */
  192                 u_int8_t chlim;         /* CurHopLimit */
  193                 u_int8_t receivedra;
  194         } ndi;
  195 };
  196 #endif
  197 
  198 struct  in6_ndireq {
  199         char ifname[IFNAMSIZ];
  200         struct nd_ifinfo ndi;
  201 };
  202 
  203 struct  in6_ndifreq {
  204         char ifname[IFNAMSIZ];
  205         u_long ifindex;
  206 };
  207 
  208 /* Prefix status */
  209 #define NDPRF_ONLINK            0x1
  210 #define NDPRF_DETACHED          0x2
  211 
  212 /* protocol constants */
  213 #define MAX_RTR_SOLICITATION_DELAY      1       /* 1sec */
  214 #define RTR_SOLICITATION_INTERVAL       4       /* 4sec */
  215 #define MAX_RTR_SOLICITATIONS           3
  216 
  217 #define ND6_INFINITE_LIFETIME           0xffffffff
  218 
  219 #ifdef _KERNEL
  220 /* node constants */
  221 #define MAX_REACHABLE_TIME              3600000 /* msec */
  222 #define REACHABLE_TIME                  30000   /* msec */
  223 #define RETRANS_TIMER                   1000    /* msec */
  224 #define MIN_RANDOM_FACTOR               512     /* 1024 * 0.5 */
  225 #define MAX_RANDOM_FACTOR               1536    /* 1024 * 1.5 */
  226 #define DEF_TEMP_VALID_LIFETIME         604800  /* 1 week */
  227 #define DEF_TEMP_PREFERRED_LIFETIME     86400   /* 1 day */
  228 #define TEMPADDR_REGEN_ADVANCE          5       /* sec */
  229 #define MAX_TEMP_DESYNC_FACTOR          600     /* 10 min */
  230 #define ND_COMPUTE_RTIME(x) \
  231                 (((MIN_RANDOM_FACTOR * (x >> 10)) + (arc4random() & \
  232                 ((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
  233 
  234 TAILQ_HEAD(nd_drhead, nd_defrouter);
  235 struct  nd_defrouter {
  236         TAILQ_ENTRY(nd_defrouter) dr_entry;
  237         struct  in6_addr rtaddr;
  238         u_char  flags;          /* flags on RA message */
  239         u_short rtlifetime;
  240         u_long  expire;
  241         struct  ifnet *ifp;
  242 };
  243 
  244 struct nd_prefix {
  245         struct ifnet *ndpr_ifp;
  246         LIST_ENTRY(nd_prefix) ndpr_entry;
  247         struct sockaddr_in6 ndpr_prefix;        /* prefix */
  248         struct in6_addr ndpr_mask; /* netmask derived from the prefix */
  249         struct in6_addr ndpr_addr; /* address that is derived from the prefix */
  250         u_int32_t ndpr_vltime;  /* advertised valid lifetime */
  251         u_int32_t ndpr_pltime;  /* advertised preferred lifetime */
  252         time_t ndpr_expire;     /* expiration time of the prefix */
  253         time_t ndpr_preferred;  /* preferred time of the prefix */
  254         struct prf_ra ndpr_flags;
  255         u_int32_t ndpr_stateflags; /* actual state flags */
  256         /* list of routers that advertise the prefix: */
  257         LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
  258         u_char  ndpr_plen;
  259         int     ndpr_refcnt;    /* reference couter from addresses */
  260 };
  261 
  262 #define ndpr_next               ndpr_entry.le_next
  263 
  264 #define ndpr_raf                ndpr_flags
  265 #define ndpr_raf_onlink         ndpr_flags.onlink
  266 #define ndpr_raf_auto           ndpr_flags.autonomous
  267 
  268 /*
  269  * We keep expired prefix for certain amount of time, for validation purposes.
  270  * 1800s = MaxRtrAdvInterval
  271  */
  272 #define NDPR_KEEP_EXPIRED       (1800 * 2)
  273 
  274 /*
  275  * Message format for use in obtaining information about prefixes
  276  * from inet6 sysctl function
  277  */
  278 struct inet6_ndpr_msghdr {
  279         u_short inpm_msglen;    /* to skip over non-understood messages */
  280         u_char  inpm_version;   /* future binary compatibility */
  281         u_char  inpm_type;      /* message type */
  282         struct in6_addr inpm_prefix;
  283         u_long  prm_vltim;
  284         u_long  prm_pltime;
  285         u_long  prm_expire;
  286         u_long  prm_preferred;
  287         struct in6_prflags prm_flags;
  288         u_short prm_index;      /* index for associated ifp */
  289         u_char  prm_plen;       /* length of prefix in bits */
  290 };
  291 
  292 #define prm_raf_onlink          prm_flags.prf_ra.onlink
  293 #define prm_raf_auto            prm_flags.prf_ra.autonomous
  294 
  295 #define prm_statef_onlink       prm_flags.prf_state.onlink
  296 
  297 #define prm_rrf_decrvalid       prm_flags.prf_rr.decrvalid
  298 #define prm_rrf_decrprefd       prm_flags.prf_rr.decrprefd
  299 
  300 #define ifpr2ndpr(ifpr) ((struct nd_prefix *)(ifpr))
  301 #define ndpr2ifpr(ndpr) ((struct ifprefix *)(ndpr))
  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 int nd6_debug;
  324 
  325 #define nd6log(x)       do { if (nd6_debug) log x; } while (/*CONSTCOND*/ 0)
  326 
  327 extern struct callout nd6_timer_ch;
  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[8];     /* max = target address list */
  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 *search;      /* multiple opts */
  346                 struct nd_opt_hdr *last;        /* multiple opts */
  347                 int done;
  348                 struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
  349         } nd_opt_each;
  350 };
  351 #define nd_opts_src_lladdr      nd_opt_each.src_lladdr
  352 #define nd_opts_tgt_lladdr      nd_opt_each.tgt_lladdr
  353 #define nd_opts_pi              nd_opt_each.pi_beg
  354 #define nd_opts_pi_end          nd_opt_each.pi_end
  355 #define nd_opts_rh              nd_opt_each.rh
  356 #define nd_opts_mtu             nd_opt_each.mtu
  357 #define nd_opts_search          nd_opt_each.search
  358 #define nd_opts_last            nd_opt_each.last
  359 #define nd_opts_done            nd_opt_each.done
  360 
  361 /* XXX: need nd6_var.h?? */
  362 /* nd6.c */
  363 void nd6_init __P((void));
  364 struct nd_ifinfo *nd6_ifattach __P((struct ifnet *));
  365 void nd6_ifdetach __P((struct nd_ifinfo *));
  366 int nd6_is_addr_neighbor __P((struct sockaddr_in6 *, struct ifnet *));
  367 void nd6_option_init __P((void *, int, union nd_opts *));
  368 struct nd_opt_hdr *nd6_option __P((union nd_opts *));
  369 int nd6_options __P((union nd_opts *));
  370 struct  rtentry *nd6_lookup __P((struct in6_addr *, int, struct ifnet *));
  371 void nd6_setmtu __P((struct ifnet *));
  372 void nd6_timer __P((void *));
  373 void nd6_purge __P((struct ifnet *));
  374 struct llinfo_nd6 *nd6_free __P((struct rtentry *));
  375 void nd6_nud_hint __P((struct rtentry *, struct in6_addr *, int));
  376 int nd6_resolve __P((struct ifnet *, struct rtentry *, struct mbuf *,
  377         struct sockaddr *, u_char *));
  378 void nd6_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
  379 int nd6_ioctl __P((u_long, caddr_t, struct ifnet *));
  380 struct rtentry *nd6_cache_lladdr __P((struct ifnet *, struct in6_addr *,
  381         char *, int, int, int));
  382 int nd6_output __P((struct ifnet *, struct ifnet *, struct mbuf *,
  383         struct sockaddr_in6 *, struct rtentry *));
  384 int nd6_storelladdr __P((struct ifnet *, struct rtentry *, struct mbuf *,
  385         struct sockaddr *, u_char *));
  386 int nd6_need_cache __P((struct ifnet *));
  387 
  388 /* nd6_nbr.c */
  389 void nd6_na_input __P((struct mbuf *, int, int));
  390 void nd6_na_output __P((struct ifnet *, const struct in6_addr *,
  391         const struct in6_addr *, u_long, int, struct sockaddr *));
  392 void nd6_ns_input __P((struct mbuf *, int, int));
  393 void nd6_ns_output __P((struct ifnet *, const struct in6_addr *,
  394         const struct in6_addr *, struct llinfo_nd6 *, int));
  395 caddr_t nd6_ifptomac __P((struct ifnet *));
  396 void nd6_dad_start __P((struct ifaddr *, int *));
  397 void nd6_dad_stop __P((struct ifaddr *));
  398 void nd6_dad_duplicated __P((struct ifaddr *));
  399 
  400 /* nd6_rtr.c */
  401 void nd6_rs_input __P((struct mbuf *, int, int));
  402 void nd6_ra_input __P((struct mbuf *, int, int));
  403 void prelist_del __P((struct nd_prefix *));
  404 void defrouter_addreq __P((struct nd_defrouter *));
  405 void defrouter_delreq __P((struct nd_defrouter *, int));
  406 void defrouter_select __P((void));
  407 void defrtrlist_del __P((struct nd_defrouter *));
  408 void prelist_remove __P((struct nd_prefix *));
  409 int prelist_update __P((struct nd_prefix *, struct nd_defrouter *,
  410         struct mbuf *));
  411 int nd6_prelist_add __P((struct nd_prefix *, struct nd_defrouter *,
  412         struct nd_prefix **));
  413 int nd6_prefix_onlink __P((struct nd_prefix *));
  414 int nd6_prefix_offlink __P((struct nd_prefix *));
  415 void pfxlist_onlink_check __P((void));
  416 struct nd_defrouter *defrouter_lookup __P((struct in6_addr *, struct ifnet *));
  417 struct nd_prefix *nd6_prefix_lookup __P((struct nd_prefix *));
  418 int in6_init_prefix_ltimes __P((struct nd_prefix *));
  419 void rt6_flush __P((struct in6_addr *, struct ifnet *));
  420 int nd6_setdefaultiface __P((int));
  421 int in6_tmpifadd __P((const struct in6_ifaddr *, int));
  422 
  423 #endif /* _KERNEL */
  424 
  425 #endif /* _NETINET6_ND6_H_ */

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