bsd/netinet6/in6_proto.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_proto.c,v 1.19 2002/10/16 02:25:05 sam Exp $     */
   2 /*      $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 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 /*
  34  * Copyright (c) 1982, 1986, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
  66  */
  67
  68
  69 #include <sys/param.h>
  70 #include <sys/socket.h>
  71 #include <sys/socketvar.h>
  72 #include <sys/protosw.h>
  73 #include <sys/kernel.h>
  74 #include <sys/domain.h>
  75 #include <sys/mbuf.h>
  76 #include <sys/systm.h>
  77 #include <sys/sysctl.h>
  78
  79 #include <net/if.h>
  80 #include <net/radix.h>
  81 #include <net/route.h>
  82
  83 #include <netinet/in.h>
  84 #include <netinet/in_systm.h>
  85 #include <netinet/in_var.h>
  86 #include <netinet/ip_encap.h>
  87 #include <netinet/ip.h>
  88 #include <netinet/ip_var.h>
  89 #include <netinet/ip6.h>
  90 #include <netinet6/ip6_var.h>
  91 #include <netinet/icmp6.h>
  92
  93 #include <netinet/tcp.h>
  94 #include <netinet/tcp_timer.h>
  95 #include <netinet/tcp_var.h>
  96 #include <netinet/udp.h>
  97 #include <netinet/udp_var.h>
  98 #include <netinet6/tcp6_var.h>
  99 #include <netinet6/raw_ip6.h>
 100 #include <netinet6/udp6_var.h>
 101 #include <netinet6/pim6_var.h>
 102 #include <netinet6/nd6.h>
 103 #include <netinet6/in6_prefix.h>
 104
 105 #if IPSEC
 106 #include <netinet6/ipsec.h>
 107 #if INET6
 108 #include <netinet6/ipsec6.h>
 109 #endif
 110 #include <netinet6/ah.h>
 111 #if INET6
 112 #include <netinet6/ah6.h>
 113 #endif
 114 #if IPSEC_ESP
 115 #include <netinet6/esp.h>
 116 #if INET6
 117 #include <netinet6/esp6.h>
 118 #endif
 119 #endif
 120 #include <netinet6/ipcomp.h>
 121 #if INET6
 122 #include <netinet6/ipcomp6.h>
 123 #endif
 124 #endif /*IPSEC*/
 125
 126 #include <netinet6/ip6protosw.h>
 127
 128 #include <net/net_osdep.h>
 129
 130 /*
 131  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 132  */
 133
 134 extern  struct domain inet6domain;
 135 static struct pr_usrreqs nousrreqs;
 136
 137 #define PR_LISTEN       0
 138 #define PR_ABRTACPTDIS  0
 139
 140 extern struct domain inet6domain;
 141 extern int in6_inithead __P((void **, int));
 142 void in6_dinit(void);
 143
 144 static int rip6_pr_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *, struct mbuf *);
 145
 146 struct ip6protosw inet6sw[] = {
 147 { 0,            &inet6domain,   IPPROTO_IPV6,   0,
 148   0,            0,              0,              0,
 149   0,
 150   ip6_init,     0,              frag6_slowtimo, frag6_drain,
 151   0, &nousrreqs
 152 },
 153 { SOCK_DGRAM,   &inet6domain,   IPPROTO_UDP,    PR_ATOMIC|PR_ADDR,
 154   udp6_input,   0,              udp6_ctlinput,  ip6_ctloutput,
 155   0,
 156   0,            0,              0,              0,
 157   0, &udp6_usrreqs
 158 },
 159 { SOCK_STREAM,  &inet6domain,   IPPROTO_TCP,    PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN,
 160   tcp6_input,   0,              tcp6_ctlinput,  tcp_ctloutput,
 161   0,
 162 #if INET        /* don't call initialization and timeout routines twice */
 163   0,            0,              0,              tcp_drain,
 164 #else
 165   tcp_init,     tcp_fasttimo,   tcp_slowtimo,   tcp_drain,
 166 #endif
 167   0, &tcp6_usrreqs,
 168 },
 169 { SOCK_RAW,     &inet6domain,   IPPROTO_RAW,    PR_ATOMIC|PR_ADDR,
 170   rip6_input,   rip6_pr_output, rip6_ctlinput,  rip6_ctloutput,
 171   0,
 172   0,            0,              0,              0,
 173   0, &rip6_usrreqs
 174 },
 175 { SOCK_RAW,     &inet6domain,   IPPROTO_ICMPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 176   icmp6_input,  rip6_pr_output, rip6_ctlinput,  rip6_ctloutput,
 177   0,
 178   icmp6_init,   icmp6_fasttimo, 0,              0,
 179   0, &rip6_usrreqs
 180 },
 181 { SOCK_RAW,     &inet6domain,   IPPROTO_DSTOPTS,PR_ATOMIC|PR_ADDR,
 182   dest6_input,  0,              0,              0,
 183   0,
 184   0,            0,              0,              0,
 185   0, &nousrreqs
 186 },
 187 { SOCK_RAW,     &inet6domain,   IPPROTO_ROUTING,PR_ATOMIC|PR_ADDR,
 188   route6_input, 0,              0,              0,
 189   0,
 190   0,            0,              0,              0,
 191   0, &nousrreqs
 192 },
 193 { SOCK_RAW,     &inet6domain,   IPPROTO_FRAGMENT,PR_ATOMIC|PR_ADDR,
 194   frag6_input,  0,              0,              0,
 195   0,
 196   0,            0,              0,              0,
 197   0, &nousrreqs
 198 },
 199 #if IPSEC
 200 { SOCK_RAW,     &inet6domain,   IPPROTO_AH,     PR_ATOMIC|PR_ADDR,
 201   ah6_input,    0,              0,              0,
 202   0,
 203   0,            0,              0,              0,
 204   0, &nousrreqs
 205 },
 206 #if IPSEC_ESP
 207 { SOCK_RAW,     &inet6domain,   IPPROTO_ESP,    PR_ATOMIC|PR_ADDR,
 208   esp6_input,   0,
 209   esp6_ctlinput,
 210   0,
 211   0,
 212   0,            0,              0,              0,
 213   0, &nousrreqs
 214 },
 215 #endif
 216 { SOCK_RAW,     &inet6domain,   IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR,
 217   ipcomp6_input, 0,             0,              0,
 218   0,
 219   0,            0,              0,              0,
 220   0, &nousrreqs
 221 },
 222 #endif /* IPSEC */
 223 #if INET
 224 { SOCK_RAW,     &inet6domain,   IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 225   encap6_input, rip6_pr_output,         0,              rip6_ctloutput,
 226   0,
 227   encap_init,   0,              0,              0,
 228   0, &rip6_usrreqs
 229 },
 230 #endif /*INET*/
 231 { SOCK_RAW,     &inet6domain,   IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 232   encap6_input, rip6_pr_output, 0,              rip6_ctloutput,
 233   0,
 234   encap_init,   0,              0,              0,
 235   0, &rip6_usrreqs
 236 },
 237 { SOCK_RAW,     &inet6domain,   IPPROTO_PIM,    PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 238   pim6_input,   rip6_pr_output, 0,              rip6_ctloutput,
 239   0,
 240   0,            0,              0,              0,
 241   0, &rip6_usrreqs
 242 },
 243 /* raw wildcard */
 244 { SOCK_RAW,     &inet6domain,   0,              PR_ATOMIC|PR_ADDR,
 245   rip6_input,   rip6_pr_output, 0,              rip6_ctloutput,
 246   0,
 247   0,            0,              0,              0,
 248   0, &rip6_usrreqs
 249 },
 250 };
 251
 252
 253 int in6_proto_count = (sizeof (inet6sw) / sizeof (struct ip6protosw));
 254
 255 struct domain inet6domain =
 256     { AF_INET6, "internet6", in6_dinit, 0, 0,
 257       (struct protosw *)inet6sw, 0,
 258       in6_inithead, offsetof(struct sockaddr_in6, sin6_addr) << 3, sizeof(struct sockaddr_in6) ,
 259       sizeof(struct sockaddr_in6), 0
 260     };
 261
 262 DOMAIN_SET(inet6);
 263
 264 /* Initialize the PF_INET6 domain, and add in the pre-defined protos */
 265 void
 266 in6_dinit()
 267 {
 268         register int i;
 269         register struct ip6protosw *pr;
 270         register struct domain *dp;
 271         static inet6domain_initted = 0;
 272
 273         if (!inet6domain_initted) {
 274                 dp = &inet6domain;
 275
 276                 for (i=0, pr = &inet6sw[0]; i<in6_proto_count; i++, pr++)
 277                         net_add_proto((struct protosw*)pr, dp);
 278
 279                 inet6domain_initted = 1;
 280         }
 281 }
 282
 283 int rip6_pr_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *sin6, struct mbuf *m1)
 284 {
 285         panic("rip6_pr_output\n");
 286         return 0;
 287 }
 288
 289 /*
 290  * Internet configuration info
 291  */
 292 #ifndef IPV6FORWARDING
 293 #if GATEWAY6
 294 #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
 295 #else
 296 #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
 297 #endif /* GATEWAY6 */
 298 #endif /* !IPV6FORWARDING */
 299
 300 #ifndef IPV6_SENDREDIRECTS
 301 #define IPV6_SENDREDIRECTS      1
 302 #endif
 303
 304 int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
 305 int     ip6_sendredirects = IPV6_SENDREDIRECTS;
 306 int     ip6_defhlim = IPV6_DEFHLIM;
 307 int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
 308 int     ip6_accept_rtadv = 0;   /* "IPV6FORWARDING ? 0 : 1" is dangerous */
 309 int     ip6_maxfragpackets;     /* initialized in frag6.c:frag6_init() */
 310 int     ip6_log_interval = 5;
 311 int     ip6_hdrnestlimit = 50;  /* appropriate? */
 312 int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
 313 u_int32_t ip6_flow_seq;
 314 int     ip6_auto_flowlabel = 1;
 315 int     ip6_gif_hlim = 0;
 316 int     ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
 317 int     ip6_rr_prune = 5;       /* router renumbering prefix
 318                                  * walk list every 5 sec.    */
 319 int     ip6_v6only = 0;         /* Mapped addresses on by default -  Radar 3347718 */
 320
 321 u_int32_t ip6_id = 0UL;
 322 int     ip6_keepfaith = 0;
 323 time_t  ip6_log_time = (time_t)0L;
 324
 325 /* icmp6 */
 326 /*
 327  * BSDI4 defines these variables in in_proto.c...
 328  * XXX: what if we don't define INET? Should we define pmtu6_expire
 329  * or so? (jinmei@kame.net 19990310)
 330  */
 331 int pmtu_expire = 60*10;
 332 int pmtu_probe = 60*2;
 333
 334 /* raw IP6 parameters */
 335 /*
 336  * Nominal space allocated to a raw ip socket.
 337  */
 338 #define RIPV6SNDQ       8192
 339 #define RIPV6RCVQ       8192
 340
 341 u_long  rip6_sendspace = RIPV6SNDQ;
 342 u_long  rip6_recvspace = RIPV6RCVQ;
 343
 344 /* ICMPV6 parameters */
 345 int     icmp6_rediraccept = 1;          /* accept and process redirects */
 346 int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
 347 int     icmp6errppslim = 100;           /* 100pps */
 348 int     icmp6_nodeinfo = 3;             /* enable/disable NI response */
 349
 350 /* UDP on IP6 parameters */
 351 int     udp6_sendspace = 9216;          /* really max datagram size */
 352 int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
 353                                         /* 40 1K datagrams */
 354
 355 /*
 356  * sysctl related items.
 357  */
 358 SYSCTL_NODE(_net,       PF_INET6,       inet6,  CTLFLAG_RW,     0,
 359         "Internet6 Family");
 360
 361 /* net.inet6 */
 362 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6,   ip6,    CTLFLAG_RW, 0,  "IP6");
 363 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6,  CTLFLAG_RW, 0,  "ICMP6");
 364 SYSCTL_NODE(_net_inet6, IPPROTO_UDP,    udp6,   CTLFLAG_RW, 0,  "UDP6");
 365 SYSCTL_NODE(_net_inet6, IPPROTO_TCP,    tcp6,   CTLFLAG_RW, 0,  "TCP6");
 366 #if IPSEC
 367 SYSCTL_NODE(_net_inet6, IPPROTO_ESP,    ipsec6, CTLFLAG_RW, 0,  "IPSEC6");
 368 #endif /* IPSEC */
 369
 370 /* net.inet6.ip6 */
 371 static int
 372 sysctl_ip6_temppltime SYSCTL_HANDLER_ARGS
 373 {
 374         int error = 0;
 375         int old;
 376
 377         error = SYSCTL_OUT(req, arg1, sizeof(int));
 378         if (error || !req->newptr)
 379                 return (error);
 380         old = ip6_temp_preferred_lifetime;
 381         error = SYSCTL_IN(req, arg1, sizeof(int));
 382         if (ip6_temp_preferred_lifetime <
 383             ip6_desync_factor + ip6_temp_regen_advance) {
 384                 ip6_temp_preferred_lifetime = old;
 385                 return(EINVAL);
 386         }
 387         return(error);
 388 }
 389
 390 static int
 391 sysctl_ip6_tempvltime SYSCTL_HANDLER_ARGS
 392 {
 393         int error = 0;
 394         int old;
 395
 396         error = SYSCTL_OUT(req, arg1, sizeof(int));
 397         if (error || !req->newptr)
 398                 return (error);
 399         old = ip6_temp_valid_lifetime;
 400         error = SYSCTL_IN(req, arg1, sizeof(int));
 401         if (ip6_temp_valid_lifetime < ip6_temp_preferred_lifetime) {
 402                 ip6_temp_preferred_lifetime = old;
 403                 return(EINVAL);
 404         }
 405         return(error);
 406 }
 407
 408 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING,
 409         forwarding, CTLFLAG_RW,         &ip6_forwarding,        0, "");
 410 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
 411         redirect, CTLFLAG_RW,           &ip6_sendredirects,     0, "");
 412 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
 413         hlim, CTLFLAG_RW,               &ip6_defhlim,   0, "");
 414 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RD,
 415         &ip6stat, ip6stat, "");
 416 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS,
 417         maxfragpackets, CTLFLAG_RW,     &ip6_maxfragpackets,    0, "");
 418 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
 419         accept_rtadv, CTLFLAG_RW,       &ip6_accept_rtadv,      0, "");
 420 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
 421         keepfaith, CTLFLAG_RW,          &ip6_keepfaith, 0, "");
 422 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
 423         log_interval, CTLFLAG_RW,       &ip6_log_interval,      0, "");
 424 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
 425         hdrnestlimit, CTLFLAG_RW,       &ip6_hdrnestlimit,      0, "");
 426 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
 427         dad_count, CTLFLAG_RW,  &ip6_dad_count, 0, "");
 428 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
 429         auto_flowlabel, CTLFLAG_RW,     &ip6_auto_flowlabel,    0, "");
 430 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
 431         defmcasthlim, CTLFLAG_RW,       &ip6_defmcasthlim,      0, "");
 432 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
 433         gifhlim, CTLFLAG_RW,    &ip6_gif_hlim,                  0, "");
 434 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
 435         kame_version, CTLFLAG_RD,       __KAME_VERSION,         0, "");
 436 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
 437         use_deprecated, CTLFLAG_RW,     &ip6_use_deprecated,    0, "");
 438 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
 439         rr_prune, CTLFLAG_RW,   &ip6_rr_prune,                  0, "");
 440 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR,
 441         use_tempaddr, CTLFLAG_RW, &ip6_use_tempaddr,            0, "");
 442 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
 443            CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_preferred_lifetime, 0,
 444            sysctl_ip6_temppltime, "I", "");
 445 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
 446            CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_valid_lifetime, 0,
 447            sysctl_ip6_tempvltime, "I", "");
 448 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY,
 449         v6only, CTLFLAG_RW,     &ip6_v6only,                    0, "");
 450 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
 451         auto_linklocal, CTLFLAG_RW, &ip6_auto_linklocal,        0, "");
 452 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
 453         &rip6stat, rip6stat, "");
 454
 455 /* net.inet6.icmp6 */
 456 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
 457         rediraccept, CTLFLAG_RW,        &icmp6_rediraccept,     0, "");
 458 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
 459         redirtimeout, CTLFLAG_RW,       &icmp6_redirtimeout,    0, "");
 460 SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
 461         &icmp6stat, icmp6stat, "");
 462 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
 463         nd6_prune, CTLFLAG_RW,          &nd6_prune,     0, "");
 464 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
 465         nd6_delay, CTLFLAG_RW,          &nd6_delay,     0, "");
 466 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
 467         nd6_umaxtries, CTLFLAG_RW,      &nd6_umaxtries, 0, "");
 468 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
 469         nd6_mmaxtries, CTLFLAG_RW,      &nd6_mmaxtries, 0, "");
 470 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
 471         nd6_useloopback, CTLFLAG_RW,    &nd6_useloopback, 0, "");
 472 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
 473         nodeinfo, CTLFLAG_RW,   &icmp6_nodeinfo,        0, "");
 474 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
 475         errppslimit, CTLFLAG_RW,        &icmp6errppslim,        0, "");
 476 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT,
 477         nd6_maxnudhint, CTLFLAG_RW,     &nd6_maxnudhint, 0, "");
 478 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG,
 479         nd6_debug, CTLFLAG_RW,  &nd6_debug,             0, "");
 480