bsd/netinet6/in6_proto.c

   1 /*
   2  * Copyright (c) 2008-2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*
  30  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  31  * All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. Neither the name of the project nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 /*
  59  * Copyright (c) 1982, 1986, 1993
  60  *      The Regents of the University of California.  All rights reserved.
  61  *
  62  * Redistribution and use in source and binary forms, with or without
  63  * modification, are permitted provided that the following conditions
  64  * are met:
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  * 2. Redistributions in binary form must reproduce the above copyright
  68  *    notice, this list of conditions and the following disclaimer in the
  69  *    documentation and/or other materials provided with the distribution.
  70  * 3. All advertising materials mentioning features or use of this software
  71  *    must display the following acknowledgement:
  72  *      This product includes software developed by the University of
  73  *      California, Berkeley and its contributors.
  74  * 4. Neither the name of the University nor the names of its contributors
  75  *    may be used to endorse or promote products derived from this software
  76  *    without specific prior written permission.
  77  *
  78  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  79  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  80  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  81  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  82  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  83  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  84  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  85  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  86  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  87  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  88  * SUCH DAMAGE.
  89  *
  90  *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
  91  */
  92
  93
  94 #include <sys/param.h>
  95 #include <sys/socket.h>
  96 #include <sys/socketvar.h>
  97 #include <sys/protosw.h>
  98 #include <sys/kernel.h>
  99 #include <sys/domain.h>
 100 #include <sys/mbuf.h>
 101 #include <sys/systm.h>
 102 #include <sys/sysctl.h>
 103
 104 #include <net/if.h>
 105 #include <net/radix.h>
 106 #include <net/route.h>
 107
 108 #include <netinet/in.h>
 109 #include <netinet/in_systm.h>
 110 #include <netinet/in_var.h>
 111 #include <netinet/ip_encap.h>
 112 #include <netinet/ip.h>
 113 #include <netinet/ip_var.h>
 114 #include <netinet/ip6.h>
 115 #include <netinet6/ip6_var.h>
 116 #include <netinet6/in6_var.h>
 117 #include <netinet/icmp6.h>
 118
 119 #include <netinet/tcp.h>
 120 #include <netinet/tcp_timer.h>
 121 #include <netinet/tcp_var.h>
 122 #include <netinet/udp.h>
 123 #include <netinet/udp_var.h>
 124 #include <netinet6/tcp6_var.h>
 125 #include <netinet6/raw_ip6.h>
 126 #include <netinet6/udp6_var.h>
 127 #include <netinet6/nd6.h>
 128 #include <netinet6/mld6_var.h>
 129
 130 #if IPSEC
 131 #include <netinet6/ipsec.h>
 132 #if INET6
 133 #include <netinet6/ipsec6.h>
 134 #endif
 135 #include <netinet6/ah.h>
 136 #if INET6
 137 #include <netinet6/ah6.h>
 138 #endif
 139 #if IPSEC_ESP
 140 #include <netinet6/esp.h>
 141 #if INET6
 142 #include <netinet6/esp6.h>
 143 #endif
 144 #endif
 145 #include <netinet6/ipcomp.h>
 146 #if INET6
 147 #include <netinet6/ipcomp6.h>
 148 #endif
 149 #endif /*IPSEC*/
 150
 151 #include <netinet6/ip6protosw.h>
 152
 153 #include <net/net_osdep.h>
 154
 155 /*
 156  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 157  */
 158
 159 extern struct domain inet6domain_s;
 160 struct domain *inet6domain = NULL;
 161
 162 static struct pr_usrreqs nousrreqs;
 163 lck_mtx_t *inet6_domain_mutex;
 164
 165 static void in6_dinit(struct domain *);
 166 static int rip6_pr_output(struct mbuf *, struct socket *,
 167     struct sockaddr_in6 *, struct mbuf *);
 168
 169 struct ip6protosw inet6sw[] = {
 170 {
 171         .pr_type =              0,
 172         .pr_protocol =          IPPROTO_IPV6,
 173         .pr_init =              ip6_init,
 174         .pr_drain =             ip6_drain,
 175         .pr_usrreqs =           &nousrreqs,
 176 },
 177 {
 178         .pr_type =              SOCK_DGRAM,
 179         .pr_protocol =          IPPROTO_UDP,
 180         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_PROTOLOCK|PR_PCBLOCK|
 181                                 PR_EVCONNINFO,
 182         .pr_input =             udp6_input,
 183         .pr_ctlinput =          udp6_ctlinput,
 184         .pr_ctloutput =         ip6_ctloutput,
 185 #if !INET       /* don't call initialization twice */
 186         .pr_init =              udp_init,
 187 #endif /* !INET */
 188         .pr_usrreqs =           &udp6_usrreqs,
 189         .pr_lock =              udp_lock,
 190         .pr_unlock =            udp_unlock,
 191         .pr_getlock =           udp_getlock,
 192 },
 193 {
 194         .pr_type =              SOCK_STREAM,
 195         .pr_protocol =          IPPROTO_TCP,
 196         .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_PCBLOCK|
 197                                 PR_PROTOLOCK|PR_DISPOSE|PR_EVCONNINFO,
 198         .pr_input =             tcp6_input,
 199         .pr_ctlinput =          tcp6_ctlinput,
 200         .pr_ctloutput =         tcp_ctloutput,
 201 #if !INET       /* don't call initialization and timeout routines twice */
 202         .pr_init =              tcp_init,
 203 #endif /* !INET */
 204         .pr_drain =             tcp_drain,
 205         .pr_usrreqs =           &tcp6_usrreqs,
 206         .pr_lock =              tcp_lock,
 207         .pr_unlock =            tcp_unlock,
 208         .pr_getlock =           tcp_getlock,
 209 },
 210 {
 211         .pr_type =              SOCK_RAW,
 212         .pr_protocol =          IPPROTO_RAW,
 213         .pr_flags =             PR_ATOMIC|PR_ADDR,
 214         .pr_input =             rip6_input,
 215         .pr_output =            rip6_pr_output,
 216         .pr_ctlinput =          rip6_ctlinput,
 217         .pr_ctloutput =         rip6_ctloutput,
 218 #if !INET       /* don't call initialization and timeout routines twice */
 219         .pr_init =              rip_init,
 220 #endif /* !INET */
 221         .pr_usrreqs =           &rip6_usrreqs,
 222         .pr_unlock =            rip_unlock,
 223 },
 224 {
 225         .pr_type =              SOCK_RAW,
 226         .pr_protocol =          IPPROTO_ICMPV6,
 227         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 228         .pr_input =             icmp6_input,
 229         .pr_output =            rip6_pr_output,
 230         .pr_ctlinput =          rip6_ctlinput,
 231         .pr_ctloutput =         rip6_ctloutput,
 232         .pr_init =              icmp6_init,
 233         .pr_usrreqs =           &rip6_usrreqs,
 234         .pr_unlock =            rip_unlock,
 235 },
 236 {
 237         .pr_type =              SOCK_DGRAM,
 238         .pr_protocol =          IPPROTO_ICMPV6,
 239         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 240         .pr_input =             icmp6_input,
 241         .pr_output =            rip6_pr_output,
 242         .pr_ctlinput =          rip6_ctlinput,
 243         .pr_ctloutput =         icmp6_dgram_ctloutput,
 244         .pr_init =              icmp6_init,
 245         .pr_usrreqs =           &icmp6_dgram_usrreqs,
 246         .pr_unlock =            rip_unlock,
 247 },
 248 {
 249         .pr_type =              SOCK_RAW,
 250         .pr_protocol =          IPPROTO_DSTOPTS,
 251         .pr_flags =             PR_ATOMIC|PR_ADDR,
 252         .pr_input =             dest6_input,
 253         .pr_usrreqs =           &nousrreqs,
 254 },
 255 {
 256         .pr_type =              SOCK_RAW,
 257         .pr_protocol =          IPPROTO_ROUTING,
 258         .pr_flags =             PR_ATOMIC|PR_ADDR,
 259         .pr_input =             route6_input,
 260         .pr_usrreqs =           &nousrreqs,
 261 },
 262 {
 263         .pr_type =              SOCK_RAW,
 264         .pr_protocol =          IPPROTO_FRAGMENT,
 265         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_PROTOLOCK,
 266         .pr_input =             frag6_input,
 267         .pr_usrreqs =           &nousrreqs,
 268 },
 269 #if IPSEC
 270 {
 271         .pr_type =              SOCK_RAW,
 272         .pr_protocol =          IPPROTO_AH,
 273         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_PROTOLOCK,
 274         .pr_input =             ah6_input,
 275         .pr_usrreqs =           &nousrreqs,
 276 },
 277 #if IPSEC_ESP
 278 {
 279         .pr_type =              SOCK_RAW,
 280         .pr_protocol =          IPPROTO_ESP,
 281         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_PROTOLOCK,
 282         .pr_input =             esp6_input,
 283         .pr_ctlinput =          esp6_ctlinput,
 284         .pr_usrreqs =           &nousrreqs,
 285 },
 286 #endif /* IPSEC_ESP */
 287 {
 288         .pr_type =              SOCK_RAW,
 289         .pr_protocol =          IPPROTO_IPCOMP,
 290         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_PROTOLOCK,
 291         .pr_input =             ipcomp6_input,
 292         .pr_usrreqs =           &nousrreqs,
 293 },
 294 #endif /* IPSEC */
 295 #if INET
 296 {
 297         .pr_type =              SOCK_RAW,
 298         .pr_protocol =          IPPROTO_IPV4,
 299         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 300         .pr_input =             encap6_input,
 301         .pr_output =            rip6_pr_output,
 302         .pr_ctloutput =         rip6_ctloutput,
 303         .pr_init =              encap6_init,
 304         .pr_usrreqs =           &rip6_usrreqs,
 305         .pr_unlock =            rip_unlock,
 306 },
 307 #endif /*INET*/
 308 {
 309         .pr_type =              SOCK_RAW,
 310         .pr_protocol =          IPPROTO_IPV6,
 311         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 312         .pr_input =             encap6_input,
 313         .pr_output =            rip6_pr_output,
 314         .pr_ctloutput =         rip6_ctloutput,
 315         .pr_init =              encap6_init,
 316         .pr_usrreqs =           &rip6_usrreqs,
 317         .pr_unlock =            rip_unlock,
 318 },
 319 /* raw wildcard */
 320 {
 321         .pr_type =              SOCK_RAW,
 322         .pr_protocol =          0,
 323         .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
 324         .pr_input =             rip6_input,
 325         .pr_output =            rip6_pr_output,
 326         .pr_ctloutput =         rip6_ctloutput,
 327         .pr_usrreqs =           &rip6_usrreqs,
 328         .pr_unlock =            rip_unlock,
 329 },
 330 };
 331
 332 int in6_proto_count = (sizeof (inet6sw) / sizeof (struct ip6protosw));
 333
 334 struct domain inet6domain_s = {
 335         .dom_family =           PF_INET6,
 336         .dom_flags =            DOM_REENTRANT,
 337         .dom_name =             "internet6",
 338         .dom_init =             in6_dinit,
 339         .dom_rtattach =         in6_inithead,
 340         .dom_rtoffset =         offsetof(struct sockaddr_in6, sin6_addr) << 3,
 341         .dom_maxrtkey =         sizeof (struct sockaddr_in6),
 342         .dom_protohdrlen =      sizeof (struct sockaddr_in6),
 343 };
 344
 345 /* Initialize the PF_INET6 domain, and add in the pre-defined protos */
 346 void
 347 in6_dinit(struct domain *dp)
 348 {
 349         struct ip6protosw *pr;
 350         int i;
 351
 352         VERIFY(!(dp->dom_flags & DOM_INITIALIZED));
 353         VERIFY(inet6domain == NULL);
 354
 355         inet6domain = dp;
 356
 357         _CASSERT(sizeof (struct protosw) == sizeof (struct ip6protosw));
 358         _CASSERT(offsetof(struct ip6protosw, pr_entry) ==
 359             offsetof(struct protosw, pr_entry));
 360         _CASSERT(offsetof(struct ip6protosw, pr_domain) ==
 361             offsetof(struct protosw, pr_domain));
 362         _CASSERT(offsetof(struct ip6protosw, pr_protosw) ==
 363             offsetof(struct protosw, pr_protosw));
 364         _CASSERT(offsetof(struct ip6protosw, pr_type) ==
 365             offsetof(struct protosw, pr_type));
 366         _CASSERT(offsetof(struct ip6protosw, pr_protocol) ==
 367             offsetof(struct protosw, pr_protocol));
 368         _CASSERT(offsetof(struct ip6protosw, pr_flags) ==
 369             offsetof(struct protosw, pr_flags));
 370         _CASSERT(offsetof(struct ip6protosw, pr_input) ==
 371             offsetof(struct protosw, pr_input));
 372         _CASSERT(offsetof(struct ip6protosw, pr_output) ==
 373             offsetof(struct protosw, pr_output));
 374         _CASSERT(offsetof(struct ip6protosw, pr_ctlinput) ==
 375             offsetof(struct protosw, pr_ctlinput));
 376         _CASSERT(offsetof(struct ip6protosw, pr_ctloutput) ==
 377             offsetof(struct protosw, pr_ctloutput));
 378         _CASSERT(offsetof(struct ip6protosw, pr_usrreqs) ==
 379             offsetof(struct protosw, pr_usrreqs));
 380         _CASSERT(offsetof(struct ip6protosw, pr_init) ==
 381             offsetof(struct protosw, pr_init));
 382         _CASSERT(offsetof(struct ip6protosw, pr_drain) ==
 383             offsetof(struct protosw, pr_drain));
 384         _CASSERT(offsetof(struct ip6protosw, pr_sysctl) ==
 385             offsetof(struct protosw, pr_sysctl));
 386         _CASSERT(offsetof(struct ip6protosw, pr_lock) ==
 387             offsetof(struct protosw, pr_lock));
 388         _CASSERT(offsetof(struct ip6protosw, pr_unlock) ==
 389             offsetof(struct protosw, pr_unlock));
 390         _CASSERT(offsetof(struct ip6protosw, pr_getlock) ==
 391             offsetof(struct protosw, pr_getlock));
 392         _CASSERT(offsetof(struct ip6protosw, pr_filter_head) ==
 393             offsetof(struct protosw, pr_filter_head));
 394         _CASSERT(offsetof(struct ip6protosw, pr_old) ==
 395             offsetof(struct protosw, pr_old));
 396
 397         /*
 398          * Attach first, then initialize.  ip6_init() needs raw IP6 handler.
 399          */
 400         for (i = 0, pr = &inet6sw[0]; i < in6_proto_count; i++, pr++)
 401                 net_add_proto((struct protosw *)pr, dp, 0);
 402         for (i = 0, pr = &inet6sw[0]; i < in6_proto_count; i++, pr++)
 403                 net_init_proto((struct protosw *)pr, dp);
 404
 405         inet6_domain_mutex = dp->dom_mtx;
 406 }
 407
 408 static int
 409 rip6_pr_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *sin6,
 410     struct mbuf *m1)
 411 {
 412 #pragma unused(m, so, sin6, m1)
 413         panic("%s\n", __func__);
 414         /* NOTREACHED */
 415         return (0);
 416 }
 417
 418 /*
 419  * Internet configuration info
 420  */
 421 #ifndef IPV6FORWARDING
 422 #if GATEWAY6
 423 #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
 424 #else
 425 #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
 426 #endif /* GATEWAY6 */
 427 #endif /* !IPV6FORWARDING */
 428
 429 #ifndef IPV6_SENDREDIRECTS
 430 #define IPV6_SENDREDIRECTS      1
 431 #endif
 432
 433 int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
 434 int     ip6_sendredirects = IPV6_SENDREDIRECTS;
 435 int     ip6_defhlim = IPV6_DEFHLIM;
 436 int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
 437 int     ip6_accept_rtadv = 1;   /* deprecated */
 438 int     ip6_log_interval = 5;
 439 int     ip6_hdrnestlimit = 15;  /* How many header options will we process? */
 440 int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
 441 int     ip6_auto_flowlabel = 1;
 442 int     ip6_gif_hlim = 0;
 443 int     ip6_use_deprecated = 1; /* allow deprecated addr [RFC 4862, 5.5.4] */
 444 int     ip6_rr_prune = 5;       /* router renumbering prefix
 445                                  * walk list every 5 sec.    */
 446 int     ip6_mcast_pmtu = 0;     /* enable pMTU discovery for multicast? */
 447 int     ip6_v6only = 0;         /* Mapped addresses off by default -  Radar 3347718  -- REVISITING FOR 10.7 -- TESTING WITH MAPPED@ OFF */
 448
 449 int     ip6_neighborgcthresh = 1024;    /* Threshold # of NDP entries for GC */
 450 int     ip6_maxifprefixes = 16;         /* Max acceptable prefixes via RA per IF */
 451 int     ip6_maxifdefrouters = 16;       /* Max acceptable def routers via RA */
 452 int     ip6_maxdynroutes = 1024;        /* Max # of routes created via redirect */
 453 int     ip6_only_allow_rfc4193_prefix = 0;      /* Only allow RFC4193 style Unique Local IPv6 Unicast prefixes */
 454
 455 static int ip6_keepfaith = 0;
 456 uint64_t ip6_log_time = 0;
 457 int     nd6_onlink_ns_rfc4861 = 0; /* allow 'on-link' nd6 NS (as in RFC 4861) */
 458
 459 /* icmp6 */
 460 /*
 461  * BSDI4 defines these variables in in_proto.c...
 462  * XXX: what if we don't define INET? Should we define pmtu6_expire
 463  * or so? (jinmei@kame.net 19990310)
 464  */
 465 int pmtu_expire = 60*10;
 466 int pmtu_probe = 60*2;
 467
 468 /* raw IP6 parameters */
 469 /*
 470  * Nominal space allocated to a raw ip socket.
 471  */
 472 #define RIPV6SNDQ       8192
 473 #define RIPV6RCVQ       8192
 474
 475 u_int32_t       rip6_sendspace = RIPV6SNDQ;
 476 u_int32_t       rip6_recvspace = RIPV6RCVQ;
 477
 478 /* ICMPV6 parameters */
 479 int     icmp6_rediraccept = 1;          /* accept and process redirects */
 480 int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
 481 int     icmp6errppslim = 500;           /* 500 packets per second */
 482 int     icmp6rappslim = 10;             /* 10 packets per second */
 483 int     icmp6_nodeinfo = 3;             /* enable/disable NI response */
 484
 485 /* UDP on IP6 parameters */
 486 int     udp6_sendspace = 9216;          /* really max datagram size */
 487 int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
 488                                         /* 40 1K datagrams */
 489
 490 /*
 491  * sysctl related items.
 492  */
 493 SYSCTL_NODE(_net, PF_INET6, inet6,
 494         CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Internet6 Family");
 495
 496 /* net.inet6 */
 497 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6,
 498         CTLFLAG_RW|CTLFLAG_LOCKED, 0, "IP6");
 499 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6,
 500         CTLFLAG_RW|CTLFLAG_LOCKED, 0, "ICMP6");
 501 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6,
 502         CTLFLAG_RW|CTLFLAG_LOCKED, 0, "UDP6");
 503 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6,
 504         CTLFLAG_RW|CTLFLAG_LOCKED, 0, "TCP6");
 505 #if IPSEC
 506 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6,
 507         CTLFLAG_RW|CTLFLAG_LOCKED, 0, "IPSEC6");
 508 #endif /* IPSEC */
 509
 510 /* net.inet6.ip6 */
 511 static int
 512 sysctl_ip6_temppltime SYSCTL_HANDLER_ARGS
 513 {
 514 #pragma unused(oidp, arg2)
 515         int error = 0;
 516         int old;
 517
 518         error = SYSCTL_OUT(req, arg1, sizeof(int));
 519         if (error || !req->newptr)
 520                 return (error);
 521         old = ip6_temp_preferred_lifetime;
 522         error = SYSCTL_IN(req, arg1, sizeof(int));
 523         if (ip6_temp_preferred_lifetime > ND6_MAX_LIFETIME ||
 524             ip6_temp_preferred_lifetime <
 525             ip6_desync_factor + ip6_temp_regen_advance) {
 526                 ip6_temp_preferred_lifetime = old;
 527                 return (EINVAL);
 528         }
 529         return (error);
 530 }
 531
 532 static int
 533 sysctl_ip6_tempvltime SYSCTL_HANDLER_ARGS
 534 {
 535 #pragma unused(oidp, arg2)
 536         int error = 0;
 537         int old;
 538
 539         error = SYSCTL_OUT(req, arg1, sizeof(int));
 540         if (error || !req->newptr)
 541                 return (error);
 542         old = ip6_temp_valid_lifetime;
 543         error = SYSCTL_IN(req, arg1, sizeof(int));
 544         if (ip6_temp_valid_lifetime > ND6_MAX_LIFETIME ||
 545             ip6_temp_valid_lifetime < ip6_temp_preferred_lifetime) {
 546                 ip6_temp_valid_lifetime = old;
 547                 return (EINVAL);
 548         }
 549         return (error);
 550 }
 551
 552 static int
 553 ip6_getstat SYSCTL_HANDLER_ARGS
 554 {
 555 #pragma unused(oidp, arg1, arg2)
 556         if (req->oldptr == USER_ADDR_NULL)
 557                 req->oldlen = (size_t)sizeof (struct ip6stat);
 558
 559         return (SYSCTL_OUT(req, &ip6stat, MIN(sizeof (ip6stat), req->oldlen)));
 560 }
 561
 562 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING,
 563         forwarding, CTLFLAG_RW | CTLFLAG_LOCKED,        &ip6_forwarding,        0, "");
 564 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
 565         redirect, CTLFLAG_RW | CTLFLAG_LOCKED,  &ip6_sendredirects,     0, "");
 566 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
 567         hlim, CTLFLAG_RW | CTLFLAG_LOCKED,              &ip6_defhlim,   0, "");
 568 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_STATS, stats,
 569         CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
 570         0, 0, ip6_getstat, "S,ip6stat", "");
 571 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
 572         accept_rtadv, CTLFLAG_RD | CTLFLAG_LOCKED,
 573         &ip6_accept_rtadv,      0, "");
 574 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
 575         keepfaith, CTLFLAG_RD | CTLFLAG_LOCKED,         &ip6_keepfaith, 0, "");
 576 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
 577         log_interval, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_log_interval,   0, "");
 578 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
 579         hdrnestlimit, CTLFLAG_RW | CTLFLAG_LOCKED,      &ip6_hdrnestlimit,      0, "");
 580 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
 581         dad_count, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_dad_count, 0, "");
 582 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
 583         auto_flowlabel, CTLFLAG_RW | CTLFLAG_LOCKED,    &ip6_auto_flowlabel,    0, "");
 584 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
 585         defmcasthlim, CTLFLAG_RW | CTLFLAG_LOCKED,      &ip6_defmcasthlim,      0, "");
 586 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
 587         gifhlim, CTLFLAG_RW | CTLFLAG_LOCKED,   &ip6_gif_hlim,                  0, "");
 588 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
 589         kame_version, CTLFLAG_RD | CTLFLAG_LOCKED, (void *)((uintptr_t)(__KAME_VERSION)),               0, "");
 590 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
 591         use_deprecated, CTLFLAG_RW | CTLFLAG_LOCKED,    &ip6_use_deprecated,    0, "");
 592 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
 593         rr_prune, CTLFLAG_RW | CTLFLAG_LOCKED,  &ip6_rr_prune,                  0, "");
 594 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR,
 595         use_tempaddr, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_use_tempaddr,           0, "");
 596 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
 597            CTLTYPE_INT|CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_temp_preferred_lifetime, 0,
 598            sysctl_ip6_temppltime, "I", "");
 599 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
 600            CTLTYPE_INT|CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_temp_valid_lifetime, 0,
 601            sysctl_ip6_tempvltime, "I", "");
 602 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY,
 603         v6only, CTLFLAG_RW | CTLFLAG_LOCKED,    &ip6_v6only,            0, "");
 604 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
 605         auto_linklocal, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_auto_linklocal,       0, "");
 606 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD | CTLFLAG_LOCKED,
 607         &rip6stat, rip6stat, "");
 608 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR,
 609         prefer_tempaddr, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_prefer_tempaddr,     0, "");
 610 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE,
 611         use_defaultzone, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_use_defzone,         0,"");
 612 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU,
 613         mcast_pmtu, CTLFLAG_RW | CTLFLAG_LOCKED,        &ip6_mcast_pmtu,        0, "");
 614 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NEIGHBORGCTHRESH,
 615         neighborgcthresh, CTLFLAG_RW | CTLFLAG_LOCKED,  &ip6_neighborgcthresh,  0, "");
 616 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXIFPREFIXES,
 617         maxifprefixes, CTLFLAG_RW | CTLFLAG_LOCKED,     &ip6_maxifprefixes,     0, "");
 618 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXIFDEFROUTERS,
 619         maxifdefrouters, CTLFLAG_RW | CTLFLAG_LOCKED,   &ip6_maxifdefrouters,   0, "");
 620 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXDYNROUTES,
 621         maxdynroutes, CTLFLAG_RW | CTLFLAG_LOCKED,      &ip6_maxdynroutes,      0, "");
 622 SYSCTL_INT(_net_inet6_ip6, OID_AUTO,
 623         only_allow_rfc4193_prefixes, CTLFLAG_RW | CTLFLAG_LOCKED,
 624         &ip6_only_allow_rfc4193_prefix, 0, "");
 625
 626 /* net.inet6.icmp6 */
 627 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
 628         rediraccept, CTLFLAG_RW | CTLFLAG_LOCKED,       &icmp6_rediraccept,     0, "");
 629 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
 630         redirtimeout, CTLFLAG_RW | CTLFLAG_LOCKED,      &icmp6_redirtimeout,    0, "");
 631 SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED,
 632         &icmp6stat, icmp6stat, "");
 633 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
 634         nd6_prune, CTLFLAG_RW | CTLFLAG_LOCKED,         &nd6_prune,     0, "");
 635 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
 636         nd6_prune_lazy, CTLFLAG_RW | CTLFLAG_LOCKED,    &nd6_prune_lazy, 0, "");
 637 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
 638         nd6_delay, CTLFLAG_RW | CTLFLAG_LOCKED,         &nd6_delay,     0, "");
 639 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
 640         nd6_umaxtries, CTLFLAG_RW | CTLFLAG_LOCKED,     &nd6_umaxtries, 0, "");
 641 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
 642         nd6_mmaxtries, CTLFLAG_RW | CTLFLAG_LOCKED,     &nd6_mmaxtries, 0, "");
 643 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
 644         nd6_useloopback, CTLFLAG_RW | CTLFLAG_LOCKED,   &nd6_useloopback, 0, "");
 645 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ACCEPT_6TO4,
 646         nd6_accept_6to4, CTLFLAG_RW | CTLFLAG_LOCKED,   &nd6_accept_6to4, 0, "");
 647 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
 648         nodeinfo, CTLFLAG_RW | CTLFLAG_LOCKED,  &icmp6_nodeinfo,        0, "");
 649 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
 650         errppslimit, CTLFLAG_RW | CTLFLAG_LOCKED,       &icmp6errppslim,        0, "");
 651 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
 652         rappslimit, CTLFLAG_RW | CTLFLAG_LOCKED,        &icmp6rappslim, 0, "");
 653 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG,
 654         nd6_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_debug,             0, "");
 655 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
 656         nd6_onlink_ns_rfc4861, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_onlink_ns_rfc4861, 0,
 657         "Accept 'on-link' nd6 NS in compliance with RFC 4861.");
 658 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_OPTIMISTIC_DAD,
 659         nd6_optimistic_dad, CTLFLAG_RW | CTLFLAG_LOCKED,        &nd6_optimistic_dad,            0, "");