sys/netinet6/in6_proto.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_proto.c,v 1.6.2.9 2003/01/24 05:11:35 sam Exp $  */
   2 /*      $DragonFly: src/sys/netinet6/in6_proto.c,v 1.10 2006/10/24 06:18:42 hsu Exp $   */
   3 /*      $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 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. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
  67  */
  68
  69 #include "opt_inet.h"
  70 #include "opt_inet6.h"
  71 #include "opt_ipsec.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/socket.h>
  75 #include <sys/socketvar.h>
  76 #include <sys/protosw.h>
  77 #include <sys/kernel.h>
  78 #include <sys/domain.h>
  79 #include <sys/mbuf.h>
  80 #include <sys/systm.h>
  81 #include <sys/sysctl.h>
  82
  83 #include <net/if.h>
  84 #include <net/radix.h>
  85 #include <net/route.h>
  86
  87 #include <netinet/in.h>
  88 #include <netinet/in_systm.h>
  89 #include <netinet/in_var.h>
  90 #include <netinet/ip_encap.h>
  91 #include <netinet/ip.h>
  92 #include <netinet/ip_var.h>
  93 #include <netinet/ip6.h>
  94 #include <netinet6/ip6_var.h>
  95 #include <netinet/icmp6.h>
  96
  97 #include <netinet/tcp.h>
  98 #include <netinet/tcp_timer.h>
  99 #include <netinet/tcp_var.h>
 100 #include <netinet/udp.h>
 101 #include <netinet/udp_var.h>
 102 #include <netinet6/tcp6_var.h>
 103 #include <netinet6/raw_ip6.h>
 104 #include <netinet6/udp6_var.h>
 105 #include <netinet6/pim6_var.h>
 106 #include <netinet6/nd6.h>
 107 #include <netinet6/in6_prefix.h>
 108
 109 #ifdef IPSEC
 110 #include <netinet6/ipsec.h>
 111 #ifdef INET6
 112 #include <netinet6/ipsec6.h>
 113 #endif
 114 #include <netinet6/ah.h>
 115 #ifdef INET6
 116 #include <netinet6/ah6.h>
 117 #endif
 118 #ifdef IPSEC_ESP
 119 #include <netinet6/esp.h>
 120 #ifdef INET6
 121 #include <netinet6/esp6.h>
 122 #endif
 123 #endif
 124 #include <netinet6/ipcomp.h>
 125 #ifdef INET6
 126 #include <netinet6/ipcomp6.h>
 127 #endif
 128 #endif /* IPSEC */
 129
 130 #ifdef FAST_IPSEC
 131 #include <netproto/ipsec/ipsec6.h>
 132 #define IPSEC
 133 #define IPSEC_ESP
 134 #define ah6_input       ipsec6_common_input
 135 #define esp6_input      ipsec6_common_input
 136 #define ipcomp6_input   ipsec6_common_input
 137 #endif /* FAST_IPSEC */
 138
 139 #include <netinet6/ip6protosw.h>
 140
 141 #include <net/net_osdep.h>
 142
 143 /*
 144  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 145  */
 146
 147 extern  struct domain inet6domain;
 148 static struct pr_usrreqs nousrreqs;
 149
 150 #define PR_LISTEN       0
 151 #define PR_ABRTACPTDIS  0
 152
 153 struct ip6protosw inet6sw[] = {
 154 { 0,            &inet6domain,   IPPROTO_IPV6,   0,
 155   0,            0,              0,              0,
 156   cpu0_soport,
 157   ip6_init,     0,              frag6_slowtimo, frag6_drain,
 158   &nousrreqs,
 159 },
 160 { SOCK_DGRAM,   &inet6domain,   IPPROTO_UDP,    PR_ATOMIC|PR_ADDR,
 161   udp6_input,   0,              udp6_ctlinput,  ip6_ctloutput,
 162   cpu0_soport,
 163   0,            0,              0,              0,
 164   &udp6_usrreqs,
 165 },
 166 { SOCK_STREAM,  &inet6domain,   IPPROTO_TCP,    PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN,
 167   tcp6_input,   0,              tcp6_ctlinput,  tcp_ctloutput,
 168   cpu0_soport,
 169 #ifdef INET     /* don't call initialization and timeout routines twice */
 170   0,            0,              0,              tcp_drain,
 171 #else
 172   tcp_init,     tcp_fasttimo,   tcp_slowtimo,   tcp_drain,
 173 #endif
 174   &tcp6_usrreqs,
 175 },
 176 { SOCK_RAW,     &inet6domain,   IPPROTO_RAW,    PR_ATOMIC|PR_ADDR,
 177   rip6_input,   rip6_output,    rip6_ctlinput,  rip6_ctloutput,
 178   cpu0_soport,
 179   0,            0,              0,              0,
 180   &rip6_usrreqs
 181 },
 182 { SOCK_RAW,     &inet6domain,   IPPROTO_ICMPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 183   icmp6_input,  rip6_output,    rip6_ctlinput,  rip6_ctloutput,
 184   cpu0_soport,
 185   icmp6_init,   icmp6_fasttimo, 0,              0,
 186   &rip6_usrreqs
 187 },
 188 { SOCK_RAW,     &inet6domain,   IPPROTO_DSTOPTS, PR_ATOMIC|PR_ADDR,
 189   dest6_input,  0,              0,              0,
 190   cpu0_soport,
 191   0,            0,              0,              0,
 192   &nousrreqs
 193 },
 194 { SOCK_RAW,     &inet6domain,   IPPROTO_ROUTING, PR_ATOMIC|PR_ADDR,
 195   route6_input, 0,              0,              0,
 196   cpu0_soport,
 197   0,            0,              0,              0,
 198   &nousrreqs
 199 },
 200 { SOCK_RAW,     &inet6domain,   IPPROTO_FRAGMENT, PR_ATOMIC|PR_ADDR,
 201   frag6_input,  0,              0,              0,
 202   cpu0_soport,
 203   0,            0,              0,              0,
 204   &nousrreqs
 205 },
 206 #ifdef IPSEC
 207 { SOCK_RAW,     &inet6domain,   IPPROTO_AH,     PR_ATOMIC|PR_ADDR,
 208   ah6_input,    0,              0,              0,
 209   cpu0_soport,
 210   0,            0,              0,              0,
 211   &nousrreqs,
 212 },
 213 #ifdef IPSEC_ESP
 214 { SOCK_RAW,     &inet6domain,   IPPROTO_ESP,    PR_ATOMIC|PR_ADDR,
 215   esp6_input,   0,
 216   esp6_ctlinput,
 217   0,
 218   cpu0_soport,
 219   0,            0,              0,              0,
 220   &nousrreqs,
 221 },
 222 #endif
 223 { SOCK_RAW,     &inet6domain,   IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR,
 224   ipcomp6_input, 0,             0,              0,
 225   cpu0_soport,
 226   0,            0,              0,              0,
 227   &nousrreqs,
 228 },
 229 #endif /* IPSEC */
 230 #ifdef INET
 231 { SOCK_RAW,     &inet6domain,   IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 232   encap6_input, rip6_output,    0,              rip6_ctloutput,
 233   cpu0_soport,
 234   encap_init,   0,              0,              0,
 235   &rip6_usrreqs
 236 },
 237 #endif /* INET */
 238 { SOCK_RAW,     &inet6domain,   IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 239   encap6_input, rip6_output,    0,              rip6_ctloutput,
 240   cpu0_soport,
 241   encap_init,   0,              0,              0,
 242   &rip6_usrreqs
 243 },
 244 { SOCK_RAW,     &inet6domain,   IPPROTO_PIM,    PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 245   pim6_input,   rip6_output,    0,              rip6_ctloutput,
 246   cpu0_soport,
 247   0,            0,              0,              0,
 248   &rip6_usrreqs
 249 },
 250 /* raw wildcard */
 251 { SOCK_RAW,     &inet6domain,   0,              PR_ATOMIC|PR_ADDR,
 252   rip6_input,   rip6_output,    0,              rip6_ctloutput,
 253   cpu0_soport,
 254   0,            0,              0,              0,
 255   &rip6_usrreqs
 256 },
 257 };
 258
 259 extern int in6_inithead (void **, int);
 260
 261 struct domain inet6domain = {
 262         AF_INET6, "internet6", NULL, NULL, NULL,
 263         (struct protosw *)inet6sw,
 264         (struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])],
 265         SLIST_ENTRY_INITIALIZER,
 266         in6_inithead, offsetof(struct sockaddr_in6, sin6_addr) << 3,
 267         sizeof(struct sockaddr_in6), in6_domifattach, in6_domifdetach
 268 };
 269
 270 DOMAIN_SET(inet6);
 271
 272 /*
 273  * Internet configuration info
 274  */
 275 #ifndef IPV6FORWARDING
 276 #ifdef GATEWAY6
 277 #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
 278 #else
 279 #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
 280 #endif /* GATEWAY6 */
 281 #endif /* !IPV6FORWARDING */
 282
 283 #ifndef IPV6_SENDREDIRECTS
 284 #define IPV6_SENDREDIRECTS      1
 285 #endif
 286
 287 int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
 288 int     ip6_sendredirects = IPV6_SENDREDIRECTS;
 289 int     ip6_defhlim = IPV6_DEFHLIM;
 290 int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
 291 int     ip6_accept_rtadv = 0;   /* "IPV6FORWARDING ? 0 : 1" is dangerous */
 292 int     ip6_maxfragpackets;     /* initialized in frag6.c:frag6_init() */
 293 int     ip6_log_interval = 5;
 294 int     ip6_hdrnestlimit = 50;  /* appropriate? */
 295 int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
 296 u_int32_t ip6_flow_seq;
 297 int     ip6_auto_flowlabel = 1;
 298 int     ip6_gif_hlim = 0;
 299 int     ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
 300 int     ip6_rr_prune = 5;       /* router renumbering prefix
 301                                  * walk list every 5 sec.    */
 302 int     ip6_v6only = 1;
 303
 304 u_int32_t ip6_id = 0UL;
 305 int     ip6_keepfaith = 0;
 306 time_t  ip6_log_time = (time_t)0L;
 307
 308 /* icmp6 */
 309 /*
 310  * BSDI4 defines these variables in in_proto.c...
 311  * XXX: what if we don't define INET? Should we define pmtu6_expire
 312  * or so? (jinmei@kame.net 19990310)
 313  */
 314 int pmtu_expire = 60*10;
 315 int pmtu_probe = 60*2;
 316
 317 /* raw IP6 parameters */
 318 /*
 319  * Nominal space allocated to a raw ip socket.
 320  */
 321 #define RIPV6SNDQ       8192
 322 #define RIPV6RCVQ       8192
 323
 324 u_long  rip6_sendspace = RIPV6SNDQ;
 325 u_long  rip6_recvspace = RIPV6RCVQ;
 326
 327 /* ICMPV6 parameters */
 328 int     icmp6_rediraccept = 1;          /* accept and process redirects */
 329 int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
 330 int     icmp6errppslim = 100;           /* 100pps */
 331 int     icmp6_nodeinfo = 3;             /* enable/disable NI response */
 332
 333 /* UDP on IP6 parameters */
 334 int     udp6_sendspace = 9216;          /* really max datagram size */
 335 int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
 336                                         /* 40 1K datagrams */
 337
 338 /*
 339  * sysctl related items.
 340  */
 341 SYSCTL_NODE(_net,       PF_INET6,       inet6,  CTLFLAG_RW,     0,
 342         "Internet6 Family");
 343
 344 /* net.inet6 */
 345 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6,   ip6,    CTLFLAG_RW, 0,  "IP6");
 346 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6,  CTLFLAG_RW, 0,  "ICMP6");
 347 SYSCTL_NODE(_net_inet6, IPPROTO_UDP,    udp6,   CTLFLAG_RW, 0,  "UDP6");
 348 SYSCTL_NODE(_net_inet6, IPPROTO_TCP,    tcp6,   CTLFLAG_RW, 0,  "TCP6");
 349 #ifdef IPSEC
 350 SYSCTL_NODE(_net_inet6, IPPROTO_ESP,    ipsec6, CTLFLAG_RW, 0,  "IPSEC6");
 351 #endif /* IPSEC */
 352
 353 /* net.inet6.ip6 */
 354 static int
 355 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
 356 {
 357         int error = 0;
 358         int old;
 359
 360         error = SYSCTL_OUT(req, arg1, sizeof(int));
 361         if (error || !req->newptr)
 362                 return (error);
 363         old = ip6_temp_preferred_lifetime;
 364         error = SYSCTL_IN(req, arg1, sizeof(int));
 365         if (ip6_temp_preferred_lifetime <
 366             ip6_desync_factor + ip6_temp_regen_advance) {
 367                 ip6_temp_preferred_lifetime = old;
 368                 return (EINVAL);
 369         }
 370         return (error);
 371 }
 372
 373 static int
 374 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
 375 {
 376         int error = 0;
 377         int old;
 378
 379         error = SYSCTL_OUT(req, arg1, sizeof(int));
 380         if (error || !req->newptr)
 381                 return (error);
 382         old = ip6_temp_valid_lifetime;
 383         error = SYSCTL_IN(req, arg1, sizeof(int));
 384         if (ip6_temp_valid_lifetime < ip6_temp_preferred_lifetime) {
 385                 ip6_temp_preferred_lifetime = old;
 386                 return (EINVAL);
 387         }
 388         return (error);
 389 }
 390
 391 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING,
 392         forwarding, CTLFLAG_RW,         &ip6_forwarding,        0, "");
 393 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
 394         redirect, CTLFLAG_RW,           &ip6_sendredirects,     0, "");
 395 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
 396         hlim, CTLFLAG_RW,               &ip6_defhlim,   0, "");
 397 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RD,
 398         &ip6stat, ip6stat, "");
 399 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS,
 400         maxfragpackets, CTLFLAG_RW,     &ip6_maxfragpackets,    0, "");
 401 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
 402         accept_rtadv, CTLFLAG_RW,       &ip6_accept_rtadv,      0, "");
 403 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
 404         keepfaith, CTLFLAG_RW,          &ip6_keepfaith, 0, "");
 405 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
 406         log_interval, CTLFLAG_RW,       &ip6_log_interval,      0, "");
 407 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
 408         hdrnestlimit, CTLFLAG_RW,       &ip6_hdrnestlimit,      0, "");
 409 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
 410         dad_count, CTLFLAG_RW,  &ip6_dad_count, 0, "");
 411 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
 412         auto_flowlabel, CTLFLAG_RW,     &ip6_auto_flowlabel,    0, "");
 413 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
 414         defmcasthlim, CTLFLAG_RW,       &ip6_defmcasthlim,      0, "");
 415 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
 416         gifhlim, CTLFLAG_RW,    &ip6_gif_hlim,                  0, "");
 417 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
 418         kame_version, CTLFLAG_RD,       __KAME_VERSION,         0, "");
 419 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
 420         use_deprecated, CTLFLAG_RW,     &ip6_use_deprecated,    0, "");
 421 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
 422         rr_prune, CTLFLAG_RW,   &ip6_rr_prune,                  0, "");
 423 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR,
 424         use_tempaddr, CTLFLAG_RW, &ip6_use_tempaddr,            0, "");
 425 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
 426            CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_preferred_lifetime, 0,
 427            sysctl_ip6_temppltime, "I", "");
 428 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
 429            CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_valid_lifetime, 0,
 430            sysctl_ip6_tempvltime, "I", "");
 431 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY,
 432         v6only, CTLFLAG_RW,     &ip6_v6only,                    0, "");
 433 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
 434         auto_linklocal, CTLFLAG_RW, &ip6_auto_linklocal,        0, "");
 435 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
 436         &rip6stat, rip6stat, "");
 437
 438 /* net.inet6.icmp6 */
 439 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
 440         rediraccept, CTLFLAG_RW,        &icmp6_rediraccept,     0, "");
 441 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
 442         redirtimeout, CTLFLAG_RW,       &icmp6_redirtimeout,    0, "");
 443 SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
 444         &icmp6stat, icmp6stat, "");
 445 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
 446         nd6_prune, CTLFLAG_RW,          &nd6_prune,     0, "");
 447 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
 448         nd6_delay, CTLFLAG_RW,          &nd6_delay,     0, "");
 449 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
 450         nd6_umaxtries, CTLFLAG_RW,      &nd6_umaxtries, 0, "");
 451 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
 452         nd6_mmaxtries, CTLFLAG_RW,      &nd6_mmaxtries, 0, "");
 453 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
 454         nd6_useloopback, CTLFLAG_RW,    &nd6_useloopback, 0, "");
 455 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
 456         nodeinfo, CTLFLAG_RW,   &icmp6_nodeinfo,        0, "");
 457 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
 458         errppslimit, CTLFLAG_RW,        &icmp6errppslim,        0, "");
 459 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT,
 460         nd6_maxnudhint, CTLFLAG_RW,     &nd6_maxnudhint, 0, "");
 461 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG,
 462         nd6_debug, CTLFLAG_RW,  &nd6_debug,             0, "");