bsd/netinet6/in6_proto.c

   1 /*
   2  * Copyright (c) 2008-2020 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 #include <net/nat464_utils.h>
 108
 109 #include <netinet/in.h>
 110 #include <netinet/in_systm.h>
 111 #include <netinet/in_var.h>
 112 #include <netinet/ip_encap.h>
 113 #include <netinet/ip.h>
 114 #include <netinet/ip_var.h>
 115 #include <netinet/ip6.h>
 116 #include <netinet6/ip6_var.h>
 117 #include <netinet6/in6_var.h>
 118 #include <netinet/icmp6.h>
 119
 120 #include <netinet/tcp.h>
 121 #include <netinet/tcp_timer.h>
 122 #include <netinet/tcp_var.h>
 123 #include <netinet/udp.h>
 124 #include <netinet/udp_var.h>
 125 #include <netinet6/tcp6_var.h>
 126 #include <netinet6/raw_ip6.h>
 127 #include <netinet6/udp6_var.h>
 128 #include <netinet6/nd6.h>
 129 #include <netinet6/mld6_var.h>
 130
 131 #if IPSEC
 132 #include <netinet6/ipsec.h>
 133 #include <netinet6/ipsec6.h>
 134 #include <netinet6/ah.h>
 135 #include <netinet6/ah6.h>
 136 #if IPSEC_ESP
 137 #include <netinet6/esp.h>
 138 #include <netinet6/esp6.h>
 139 #endif
 140 #endif /*IPSEC*/
 141
 142 #include <netinet6/ip6protosw.h>
 143
 144 #include <net/net_osdep.h>
 145
 146 /*
 147  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 148  */
 149
 150 extern struct domain inet6domain_s;
 151 struct domain *inet6domain = NULL;
 152
 153 static struct pr_usrreqs nousrreqs;
 154 lck_mtx_t *inet6_domain_mutex;
 155
 156 static void in6_dinit(struct domain *);
 157 static int rip6_pr_output(struct mbuf *, struct socket *,
 158     struct sockaddr_in6 *, struct mbuf *);
 159
 160 struct ip6protosw inet6sw[] = {
 161         {
 162                 .pr_type =              0,
 163                 .pr_protocol =          IPPROTO_IPV6,
 164                 .pr_init =              ip6_init,
 165                 .pr_drain =             ip6_drain,
 166                 .pr_usrreqs =           &nousrreqs,
 167         },
 168         {
 169                 .pr_type =              SOCK_DGRAM,
 170                 .pr_protocol =          IPPROTO_UDP,
 171                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_PROTOLOCK | PR_PCBLOCK |
 172     PR_EVCONNINFO | PR_PRECONN_WRITE,
 173                 .pr_input =             udp6_input,
 174                 .pr_ctlinput =          udp6_ctlinput,
 175                 .pr_ctloutput =         ip6_ctloutput,
 176 #if !INET       /* don't call initialization twice */
 177                 .pr_init =              udp_init,
 178 #endif /* !INET */
 179                 .pr_usrreqs =           &udp6_usrreqs,
 180                 .pr_lock =              udp_lock,
 181                 .pr_unlock =            udp_unlock,
 182                 .pr_getlock =           udp_getlock,
 183                 .pr_update_last_owner = inp_update_last_owner,
 184                 .pr_copy_last_owner =   inp_copy_last_owner,
 185         },
 186         {
 187                 .pr_type =              SOCK_STREAM,
 188                 .pr_protocol =          IPPROTO_TCP,
 189                 .pr_flags =             PR_CONNREQUIRED | PR_WANTRCVD | PR_PCBLOCK |
 190     PR_PROTOLOCK | PR_DISPOSE | PR_EVCONNINFO |
 191     PR_PRECONN_WRITE | PR_DATA_IDEMPOTENT,
 192                 .pr_input =             tcp6_input,
 193                 .pr_ctlinput =          tcp6_ctlinput,
 194                 .pr_ctloutput =         tcp_ctloutput,
 195 #if !INET       /* don't call initialization and timeout routines twice */
 196                 .pr_init =              tcp_init,
 197 #endif /* !INET */
 198                 .pr_drain =             tcp_drain,
 199                 .pr_usrreqs =           &tcp6_usrreqs,
 200                 .pr_lock =              tcp_lock,
 201                 .pr_unlock =            tcp_unlock,
 202                 .pr_getlock =           tcp_getlock,
 203                 .pr_update_last_owner = inp_update_last_owner,
 204                 .pr_copy_last_owner =   inp_copy_last_owner,
 205         },
 206         {
 207                 .pr_type =              SOCK_RAW,
 208                 .pr_protocol =          IPPROTO_RAW,
 209                 .pr_flags =             PR_ATOMIC | PR_ADDR,
 210                 .pr_input =             rip6_input,
 211                 .pr_output =            rip6_pr_output,
 212                 .pr_ctlinput =          rip6_ctlinput,
 213                 .pr_ctloutput =         rip6_ctloutput,
 214 #if !INET       /* don't call initialization and timeout routines twice */
 215                 .pr_init =              rip_init,
 216 #endif /* !INET */
 217                 .pr_usrreqs =           &rip6_usrreqs,
 218                 .pr_unlock =            rip_unlock,
 219                 .pr_update_last_owner = inp_update_last_owner,
 220                 .pr_copy_last_owner =   inp_copy_last_owner,
 221         },
 222         {
 223                 .pr_type =              SOCK_RAW,
 224                 .pr_protocol =          IPPROTO_ICMPV6,
 225                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_LASTHDR,
 226                 .pr_input =             icmp6_input,
 227                 .pr_output =            rip6_pr_output,
 228                 .pr_ctlinput =          rip6_ctlinput,
 229                 .pr_ctloutput =         rip6_ctloutput,
 230                 .pr_init =              icmp6_init,
 231                 .pr_usrreqs =           &rip6_usrreqs,
 232                 .pr_unlock =            rip_unlock,
 233                 .pr_update_last_owner = inp_update_last_owner,
 234                 .pr_copy_last_owner =   inp_copy_last_owner,
 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                 .pr_update_last_owner = inp_update_last_owner,
 248                 .pr_copy_last_owner =   inp_copy_last_owner,
 249         },
 250         {
 251                 .pr_type =              SOCK_RAW,
 252                 .pr_protocol =          IPPROTO_DSTOPTS,
 253                 .pr_flags =             PR_ATOMIC | PR_ADDR,
 254                 .pr_input =             dest6_input,
 255                 .pr_usrreqs =           &nousrreqs,
 256         },
 257         {
 258                 .pr_type =              SOCK_RAW,
 259                 .pr_protocol =          IPPROTO_ROUTING,
 260                 .pr_flags =             PR_ATOMIC | PR_ADDR,
 261                 .pr_input =             route6_input,
 262                 .pr_usrreqs =           &nousrreqs,
 263         },
 264         {
 265                 .pr_type =              SOCK_RAW,
 266                 .pr_protocol =          IPPROTO_FRAGMENT,
 267                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_PROTOLOCK,
 268                 .pr_input =             frag6_input,
 269                 .pr_usrreqs =           &nousrreqs,
 270         },
 271 #if IPSEC
 272         {
 273                 .pr_type =              SOCK_RAW,
 274                 .pr_protocol =          IPPROTO_AH,
 275                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_PROTOLOCK,
 276                 .pr_input =             ah6_input,
 277                 .pr_usrreqs =           &nousrreqs,
 278         },
 279 #if IPSEC_ESP
 280         {
 281                 .pr_type =              SOCK_RAW,
 282                 .pr_protocol =          IPPROTO_ESP,
 283                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_PROTOLOCK,
 284                 .pr_input =             esp6_input,
 285                 .pr_ctlinput =          esp6_ctlinput,
 286                 .pr_usrreqs =           &nousrreqs,
 287         },
 288 #endif /* IPSEC_ESP */
 289 #endif /* IPSEC */
 290 #if INET
 291         {
 292                 .pr_type =              SOCK_RAW,
 293                 .pr_protocol =          IPPROTO_IPV4,
 294                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_LASTHDR,
 295                 .pr_input =             encap6_input,
 296                 .pr_output =            rip6_pr_output,
 297                 .pr_ctloutput =         rip6_ctloutput,
 298                 .pr_init =              encap6_init,
 299                 .pr_usrreqs =           &rip6_usrreqs,
 300                 .pr_unlock =            rip_unlock,
 301                 .pr_update_last_owner = inp_update_last_owner,
 302                 .pr_copy_last_owner =   inp_copy_last_owner,
 303         },
 304 #endif /*INET*/
 305         {
 306                 .pr_type =              SOCK_RAW,
 307                 .pr_protocol =          IPPROTO_IPV6,
 308                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_LASTHDR,
 309                 .pr_input =             encap6_input,
 310                 .pr_output =            rip6_pr_output,
 311                 .pr_ctloutput =         rip6_ctloutput,
 312                 .pr_init =              encap6_init,
 313                 .pr_usrreqs =           &rip6_usrreqs,
 314                 .pr_unlock =            rip_unlock,
 315                 .pr_update_last_owner = inp_update_last_owner,
 316                 .pr_copy_last_owner =   inp_copy_last_owner,
 317         },
 318 /* raw wildcard */
 319         {
 320                 .pr_type =              SOCK_RAW,
 321                 .pr_protocol =          0,
 322                 .pr_flags =             PR_ATOMIC | PR_ADDR | PR_LASTHDR,
 323                 .pr_input =             rip6_input,
 324                 .pr_output =            rip6_pr_output,
 325                 .pr_ctloutput =         rip6_ctloutput,
 326                 .pr_usrreqs =           &rip6_usrreqs,
 327                 .pr_unlock =            rip_unlock,
 328                 .pr_update_last_owner = inp_update_last_owner,
 329                 .pr_copy_last_owner =   inp_copy_last_owner,
 330         },
 331 };
 332
 333 int in6_proto_count = (sizeof(inet6sw) / sizeof(struct ip6protosw));
 334
 335 struct domain inet6domain_s = {
 336         .dom_family =           PF_INET6,
 337         .dom_flags =            DOM_REENTRANT,
 338         .dom_name =             "internet6",
 339         .dom_init =             in6_dinit,
 340         .dom_rtattach =         in6_inithead,
 341         .dom_rtoffset =         offsetof(struct sockaddr_in6, sin6_addr) << 3,
 342                 .dom_maxrtkey =         sizeof(struct sockaddr_in6),
 343                 .dom_protohdrlen =      sizeof(struct sockaddr_in6),
 344 };
 345
 346 /* Initialize the PF_INET6 domain, and add in the pre-defined protos */
 347 void
 348 in6_dinit(struct domain *dp)
 349 {
 350         struct ip6protosw *pr;
 351         int i;
 352
 353         VERIFY(!(dp->dom_flags & DOM_INITIALIZED));
 354         VERIFY(inet6domain == NULL);
 355
 356         inet6domain = dp;
 357
 358         _CASSERT(sizeof(struct protosw) == sizeof(struct ip6protosw));
 359         _CASSERT(offsetof(struct ip6protosw, pr_entry) ==
 360             offsetof(struct protosw, pr_entry));
 361         _CASSERT(offsetof(struct ip6protosw, pr_domain) ==
 362             offsetof(struct protosw, pr_domain));
 363         _CASSERT(offsetof(struct ip6protosw, pr_protosw) ==
 364             offsetof(struct protosw, pr_protosw));
 365         _CASSERT(offsetof(struct ip6protosw, pr_type) ==
 366             offsetof(struct protosw, pr_type));
 367         _CASSERT(offsetof(struct ip6protosw, pr_protocol) ==
 368             offsetof(struct protosw, pr_protocol));
 369         _CASSERT(offsetof(struct ip6protosw, pr_flags) ==
 370             offsetof(struct protosw, pr_flags));
 371         _CASSERT(offsetof(struct ip6protosw, pr_input) ==
 372             offsetof(struct protosw, pr_input));
 373         _CASSERT(offsetof(struct ip6protosw, pr_output) ==
 374             offsetof(struct protosw, pr_output));
 375         _CASSERT(offsetof(struct ip6protosw, pr_ctlinput) ==
 376             offsetof(struct protosw, pr_ctlinput));
 377         _CASSERT(offsetof(struct ip6protosw, pr_ctloutput) ==
 378             offsetof(struct protosw, pr_ctloutput));
 379         _CASSERT(offsetof(struct ip6protosw, pr_usrreqs) ==
 380             offsetof(struct protosw, pr_usrreqs));
 381         _CASSERT(offsetof(struct ip6protosw, pr_init) ==
 382             offsetof(struct protosw, pr_init));
 383         _CASSERT(offsetof(struct ip6protosw, pr_drain) ==
 384             offsetof(struct protosw, pr_drain));
 385         _CASSERT(offsetof(struct ip6protosw, pr_sysctl) ==
 386             offsetof(struct protosw, pr_sysctl));
 387         _CASSERT(offsetof(struct ip6protosw, pr_lock) ==
 388             offsetof(struct protosw, pr_lock));
 389         _CASSERT(offsetof(struct ip6protosw, pr_unlock) ==
 390             offsetof(struct protosw, pr_unlock));
 391         _CASSERT(offsetof(struct ip6protosw, pr_getlock) ==
 392             offsetof(struct protosw, pr_getlock));
 393         _CASSERT(offsetof(struct ip6protosw, pr_filter_head) ==
 394             offsetof(struct protosw, pr_filter_head));
 395         _CASSERT(offsetof(struct ip6protosw, pr_old) ==
 396             offsetof(struct protosw, pr_old));
 397         _CASSERT(offsetof(struct ip6protosw, pr_update_last_owner) ==
 398             offsetof(struct protosw, pr_update_last_owner));
 399         _CASSERT(offsetof(struct ip6protosw, pr_copy_last_owner) ==
 400             offsetof(struct protosw, pr_copy_last_owner));
 401
 402         /*
 403          * Attach first, then initialize.  ip6_init() needs raw IP6 handler.
 404          */
 405         for (i = 0, pr = &inet6sw[0]; i < in6_proto_count; i++, pr++) {
 406                 net_add_proto((struct protosw *)pr, dp, 0);
 407         }
 408         for (i = 0, pr = &inet6sw[0]; i < in6_proto_count; i++, pr++) {
 409                 net_init_proto((struct protosw *)pr, dp);
 410         }
 411
 412         inet6_domain_mutex = dp->dom_mtx;
 413 }
 414
 415 static int
 416 rip6_pr_output(struct mbuf *m, struct socket *so, struct sockaddr_in6 *sin6,
 417     struct mbuf *m1)
 418 {
 419 #pragma unused(m, so, sin6, m1)
 420         panic("%s\n", __func__);
 421         /* NOTREACHED */
 422         return 0;
 423 }
 424
 425 /*
 426  * Internet configuration info
 427  */
 428 #ifndef IPV6FORWARDING
 429 #if GATEWAY6
 430 #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
 431 #else
 432 #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
 433 #endif /* GATEWAY6 */
 434 #endif /* !IPV6FORWARDING */
 435
 436 #ifndef IPV6_SENDREDIRECTS
 437 #define IPV6_SENDREDIRECTS      1
 438 #endif
 439
 440 int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
 441 int     ip6_sendredirects = IPV6_SENDREDIRECTS;
 442 int     ip6_defhlim = IPV6_DEFHLIM;
 443 int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
 444 int     ip6_accept_rtadv = 1;   /* deprecated */
 445 int     ip6_log_interval = 5;
 446 int     ip6_hdrnestlimit = 15;  /* How many header options will we process? */
 447 int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
 448 int     ip6_auto_flowlabel = 1;
 449 int     ip6_gif_hlim = 0;
 450 int     ip6_use_deprecated = 1; /* allow deprecated addr [RFC 4862, 5.5.4] */
 451 int     ip6_rr_prune = 5;       /* router renumbering prefix
 452                                  * walk list every 5 sec.    */
 453 int     ip6_mcast_pmtu = 0;     /* enable pMTU discovery for multicast? */
 454 int     ip6_v6only = 0;         /* Mapped addresses off by default -  Radar 3347718  -- REVISITING FOR 10.7 -- TESTING WITH MAPPED@ OFF */
 455
 456 int     ip6_neighborgcthresh = 1024;    /* Threshold # of NDP entries for GC */
 457 int     ip6_maxifprefixes = 16;         /* Max acceptable prefixes via RA per IF */
 458 int     ip6_maxifdefrouters = 64;       /* Max acceptable default or RTI routers via RA */
 459 int     ip6_maxdynroutes = 1024;        /* Max # of routes created via redirect */
 460 int     ip6_only_allow_rfc4193_prefix = 0;      /* Only allow RFC4193 style Unique Local IPv6 Unicast prefixes */
 461
 462 static int ip6_keepfaith = 0;
 463 uint64_t ip6_log_time = 0;
 464 int     nd6_onlink_ns_rfc4861 = 0; /* allow 'on-link' nd6 NS (as in RFC 4861) */
 465
 466 /* icmp6 */
 467 /*
 468  * BSDI4 defines these variables in in_proto.c...
 469  * XXX: what if we don't define INET? Should we define pmtu6_expire
 470  * or so? (jinmei@kame.net 19990310)
 471  */
 472 int pmtu_expire = 60 * 10;
 473 int pmtu_probe = 60 * 2;
 474
 475 /* raw IP6 parameters */
 476 /*
 477  * Nominal space allocated to a raw ip socket.
 478  */
 479 #define RIPV6SNDQ       8192
 480 #define RIPV6RCVQ       8192
 481
 482 u_int32_t       rip6_sendspace = RIPV6SNDQ;
 483 u_int32_t       rip6_recvspace = RIPV6RCVQ;
 484
 485 /* ICMPV6 parameters */
 486 int     icmp6_rediraccept = 1;          /* accept and process redirects */
 487 int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
 488 int     icmp6errppslim = 500;           /* 500 packets per second */
 489 int     icmp6rappslim = 10;             /* 10 packets per second */
 490 int     icmp6_nodeinfo = 3;             /* enable/disable NI response */
 491
 492 /* UDP on IP6 parameters */
 493 int     udp6_sendspace = 9216;          /* really max datagram size */
 494 int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
 495 /* 40 1K datagrams */
 496
 497 /*
 498  * sysctl related items.
 499  */
 500 SYSCTL_NODE(_net, PF_INET6, inet6,
 501     CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Internet6 Family");
 502
 503 /* net.inet6 */
 504 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6,
 505     CTLFLAG_RW | CTLFLAG_LOCKED, 0, "IP6");
 506 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6,
 507     CTLFLAG_RW | CTLFLAG_LOCKED, 0, "ICMP6");
 508 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6,
 509     CTLFLAG_RW | CTLFLAG_LOCKED, 0, "UDP6");
 510 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6,
 511     CTLFLAG_RW | CTLFLAG_LOCKED, 0, "TCP6");
 512 #if IPSEC
 513 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6,
 514     CTLFLAG_RW | CTLFLAG_LOCKED, 0, "IPSEC6");
 515 #endif /* IPSEC */
 516
 517 /* net.inet6.ip6 */
 518 static int
 519 sysctl_ip6_temppltime SYSCTL_HANDLER_ARGS
 520 {
 521 #pragma unused(oidp, arg2)
 522         int error = 0;
 523         int value = 0;
 524
 525         error = SYSCTL_OUT(req, arg1, sizeof(int));
 526         if (error || !req->newptr) {
 527                 return error;
 528         }
 529
 530         error = SYSCTL_IN(req, &value, sizeof(value));
 531         if (error) {
 532                 return error;
 533         }
 534
 535         if (value > ND6_MAX_LIFETIME ||
 536             value < ip6_desync_factor + ip6_temp_regen_advance) {
 537                 return EINVAL;
 538         }
 539
 540         ip6_temp_preferred_lifetime = value;
 541         return error;
 542 }
 543
 544 static int
 545 sysctl_ip6_tempvltime SYSCTL_HANDLER_ARGS
 546 {
 547 #pragma unused(oidp, arg2)
 548         int error = 0;
 549         int value = 0;
 550
 551         error = SYSCTL_OUT(req, arg1, sizeof(int));
 552         if (error || !req->newptr) {
 553                 return error;
 554         }
 555
 556         error = SYSCTL_IN(req, &value, sizeof(value));
 557         if (error) {
 558                 return error;
 559         }
 560
 561         if (value > ND6_MAX_LIFETIME ||
 562             value < ip6_temp_preferred_lifetime) {
 563                 return EINVAL;
 564         }
 565
 566         ip6_temp_valid_lifetime = value;
 567         return error;
 568 }
 569
 570 static int
 571 sysctl_ip6_cga_conflict_retries SYSCTL_HANDLER_ARGS
 572 {
 573 #pragma unused(oidp, arg2)
 574         int error = 0;
 575         int value = 0;
 576
 577         error = SYSCTL_OUT(req, arg1, sizeof(int));
 578         if (error || !req->newptr) {
 579                 return error;
 580         }
 581
 582         error = SYSCTL_IN(req, &value, sizeof(value));
 583         if (error) {
 584                 return error;
 585         }
 586         if (value > IPV6_CGA_CONFLICT_RETRIES_MAX || value < 0) {
 587                 return EINVAL;
 588         }
 589
 590         ip6_cga_conflict_retries = value;
 591         return 0;
 592 }
 593
 594 static int
 595 ip6_getstat SYSCTL_HANDLER_ARGS
 596 {
 597 #pragma unused(oidp, arg1, arg2)
 598         if (req->oldptr == USER_ADDR_NULL) {
 599                 req->oldlen = (size_t)sizeof(struct ip6stat);
 600         }
 601
 602         return SYSCTL_OUT(req, &ip6stat, MIN(sizeof(ip6stat), req->oldlen));
 603 }
 604
 605 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING,
 606     forwarding, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_forwarding, 0, "");
 607 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
 608     redirect, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_sendredirects, 0, "");
 609 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
 610     hlim, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_defhlim, 0, "");
 611 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_STATS, stats,
 612     CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
 613     0, 0, ip6_getstat, "S,ip6stat", "");
 614
 615 #if (DEVELOPMENT || DEBUG)
 616 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
 617     accept_rtadv, CTLFLAG_RW | CTLFLAG_LOCKED,
 618     &ip6_accept_rtadv, 0, "");
 619 #else
 620 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
 621     accept_rtadv, CTLFLAG_RD | CTLFLAG_LOCKED,
 622     &ip6_accept_rtadv, 0, "");
 623 #endif /* (DEVELOPMENT || DEBUG) */
 624 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
 625     keepfaith, CTLFLAG_RD | CTLFLAG_LOCKED, &ip6_keepfaith, 0, "");
 626 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
 627     log_interval, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_log_interval, 0, "");
 628 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
 629     hdrnestlimit, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_hdrnestlimit, 0, "");
 630 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
 631     dad_count, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_dad_count, 0, "");
 632 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
 633     auto_flowlabel, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_auto_flowlabel, 0, "");
 634 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
 635     defmcasthlim, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_defmcasthlim, 0, "");
 636 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
 637     gifhlim, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_gif_hlim, 0, "");
 638 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
 639     kame_version, CTLFLAG_RD | CTLFLAG_LOCKED, (void *)((uintptr_t)(__KAME_VERSION)), 0, "");
 640 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
 641     use_deprecated, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_use_deprecated, 0, "");
 642 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
 643     rr_prune, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_rr_prune, 0, "");
 644 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR,
 645     use_tempaddr, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_use_tempaddr, 0, "");
 646 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
 647     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_temp_preferred_lifetime, 0,
 648     sysctl_ip6_temppltime, "I", "");
 649 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
 650     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_temp_valid_lifetime, 0,
 651     sysctl_ip6_tempvltime, "I", "");
 652 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY,
 653     v6only, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_v6only, 0, "");
 654 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
 655     auto_linklocal, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_auto_linklocal, 0, "");
 656 SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD | CTLFLAG_LOCKED,
 657     &rip6stat, rip6stat, "");
 658 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR,
 659     prefer_tempaddr, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_prefer_tempaddr, 0, "");
 660 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE,
 661     use_defaultzone, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_use_defzone, 0, "");
 662 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU,
 663     mcast_pmtu, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_mcast_pmtu, 0, "");
 664 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NEIGHBORGCTHRESH,
 665     neighborgcthresh, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_neighborgcthresh, 0, "");
 666 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXIFPREFIXES,
 667     maxifprefixes, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_maxifprefixes, 0, "");
 668 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXIFDEFROUTERS,
 669     maxifdefrouters, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_maxifdefrouters, 0, "");
 670 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXDYNROUTES,
 671     maxdynroutes, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_maxdynroutes, 0, "");
 672 SYSCTL_INT(_net_inet6_ip6, OID_AUTO,
 673     only_allow_rfc4193_prefixes, CTLFLAG_RW | CTLFLAG_LOCKED,
 674     &ip6_only_allow_rfc4193_prefix, 0, "");
 675 SYSCTL_INT(_net_inet6_ip6, OID_AUTO,
 676     clat_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &clat_debug, 0, "");
 677
 678 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO,
 679     cga_conflict_retries, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
 680     &ip6_cga_conflict_retries, 0, sysctl_ip6_cga_conflict_retries, "IU", "");
 681
 682 /*
 683  * One single sysctl to set v6 stack profile for IPv6 compliance testing.
 684  * A lot of compliance test suites are not aware of other enhancements in IPv6
 685  * protocol and expect some arguably obsolete behavior.
 686  */
 687 int v6_compliance_profile = 0;
 688 static int
 689 sysctl_set_v6_compliance_profile SYSCTL_HANDLER_ARGS
 690 {
 691 #pragma unused(oidp, arg2)
 692         int changed, error;
 693         int value = *(int *) arg1;
 694
 695         error = sysctl_io_number(req, value, sizeof(value), &value, &changed);
 696         if (error || !changed) {
 697                 return error;
 698         }
 699
 700         if (value != 0 && value != 1) {
 701                 return ERANGE;
 702         }
 703
 704         if (value == 1) {
 705                 ip6_use_tempaddr = 0;
 706                 dad_enhanced = 0;
 707                 icmp6_rediraccept = 1;
 708                 nd6_optimistic_dad = 0;
 709                 nd6_process_rti = ND6_PROCESS_RTI_ENABLE;
 710         } else {
 711                 ip6_use_tempaddr = IP6_USE_TMPADDR_DEFAULT;
 712                 dad_enhanced = ND6_DAD_ENHANCED_DEFAULT;
 713                 icmp6_rediraccept = ICMP6_REDIRACCEPT_DEFAULT;
 714                 nd6_optimistic_dad = ND6_OPTIMISTIC_DAD_DEFAULT;
 715                 nd6_process_rti = ND6_PROCESS_RTI_DEFAULT;
 716         }
 717
 718         v6_compliance_profile = value;
 719         return 0;
 720 }
 721
 722 SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, compliance_profile,
 723     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
 724     &v6_compliance_profile, 0, sysctl_set_v6_compliance_profile,
 725     "I", "set IPv6 compliance profile");
 726
 727 /* net.inet6.icmp6 */
 728 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
 729     rediraccept, CTLFLAG_RW | CTLFLAG_LOCKED, &icmp6_rediraccept, 0, "");
 730 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
 731     redirtimeout, CTLFLAG_RW | CTLFLAG_LOCKED, &icmp6_redirtimeout, 0, "");
 732 SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD | CTLFLAG_LOCKED,
 733     &icmp6stat, icmp6stat, "");
 734 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
 735     nd6_prune, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_prune, 0, "");
 736 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
 737     nd6_prune_lazy, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_prune_lazy, 0, "");
 738 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
 739     nd6_delay, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_delay, 0, "");
 740 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
 741     nd6_umaxtries, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_umaxtries, 0, "");
 742 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
 743     nd6_mmaxtries, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_mmaxtries, 0, "");
 744 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
 745     nd6_useloopback, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_useloopback, 0, "");
 746 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ACCEPT_6TO4,
 747     nd6_accept_6to4, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_accept_6to4, 0, "");
 748 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
 749     nodeinfo, CTLFLAG_RW | CTLFLAG_LOCKED, &icmp6_nodeinfo, 0, "");
 750 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
 751     errppslimit, CTLFLAG_RW | CTLFLAG_LOCKED, &icmp6errppslim, 0, "");
 752 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
 753     rappslimit, CTLFLAG_RW | CTLFLAG_LOCKED, &icmp6rappslim, 0, "");
 754 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG,
 755     nd6_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_debug, 0, "");
 756 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
 757     nd6_onlink_ns_rfc4861, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_onlink_ns_rfc4861, 0,
 758     "Accept 'on-link' nd6 NS in compliance with RFC 4861.");
 759 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_OPTIMISTIC_DAD,
 760     nd6_optimistic_dad, CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_optimistic_dad, 0, "");