bsd/netinet6/in6_proto.c

   1 /*      $KAME: in6_proto.c,v 1.47 2000/03/29 07:37:22 sumikawa Exp $    */
   2
   3 /*
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 1982, 1986, 1993
  34  *      The Regents of the University of California.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. All advertising materials mentioning features or use of this software
  45  *    must display the following acknowledgement:
  46  *      This product includes software developed by the University of
  47  *      California, Berkeley and its contributors.
  48  * 4. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  *
  64  *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
  65  */
  66
  67 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
  68 #include "opt_inet.h"
  69 #if __NetBSD__  /*XXX*/
  70 #include "opt_ipsec.h"
  71 #endif
  72 #endif
  73
  74 #include <sys/param.h>
  75 #include <sys/socket.h>
  76 #if defined(__FreeBSD__) || defined (__APPLE__)
  77 #include <sys/socketvar.h>
  78 #endif
  79 #include <sys/protosw.h>
  80 #include <sys/kernel.h>
  81 #include <sys/domain.h>
  82 #include <sys/mbuf.h>
  83 #if defined (__FreeBSD__) || defined (__APPLE__)
  84 #include <sys/systm.h>
  85 #include <sys/sysctl.h>
  86 #endif
  87
  88 #include <net/if.h>
  89 #include <net/radix.h>
  90 #include <net/route.h>
  91
  92 #include <netinet/in.h>
  93 #include <netinet/in_systm.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/ip_encap.h>
  96 #if defined (__APPLE__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3) || (defined(__NetBSD__) && !defined(TCP6)) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
  97 #include <netinet/ip.h>
  98 #include <netinet/ip_var.h>
  99 #endif
 100 #if (defined(__NetBSD__) && !defined(TCP6)) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
 101 #include <netinet/in_pcb.h>
 102 #endif
 103 #include <netinet/ip6.h>
 104 #include <netinet6/ip6_var.h>
 105 #include <netinet/icmp6.h>
 106
 107 #if defined (__APPLE__)
 108 #include <netinet/tcp.h>
 109 #include <netinet/tcp_timer.h>
 110 #include <netinet/tcp_var.h>
 111 #include <netinet/udp.h>
 112 #include <netinet/udp_var.h>
 113 # if (defined(__FreeBSD__) && __FreeBSD__ >= 4)
 114 #include <netinet6/tcp6_var.h>
 115 # endif
 116 #else
 117 #if defined(__NetBSD__) && !defined(TCP6)
 118 #include <netinet/tcp.h>
 119 #include <netinet/tcp_fsm.h>
 120 #include <netinet/tcp_seq.h>
 121 #include <netinet/tcp_timer.h>
 122 #include <netinet/tcp_var.h>
 123 #include <netinet/tcpip.h>
 124 #include <netinet/tcp_debug.h>
 125 #else
 126 #include <netinet6/tcp6.h>
 127 #include <netinet6/tcp6_fsm.h>
 128 #include <netinet6/tcp6_seq.h>
 129 #include <netinet6/tcp6_timer.h>
 130 #include <netinet6/tcp6_var.h>
 131 #endif
 132 #endif
 133
 134 #include <netinet6/udp6.h>
 135 #include <netinet6/udp6_var.h>
 136
 137 #include <netinet6/pim6_var.h>
 138
 139 #include <netinet6/nd6.h>
 140 #if defined (__APPLE__)
 141 #include <netinet6/in6_prefix.h>
 142 #endif
 143
 144 #if IPSEC
 145 #include <netinet6/ipsec.h>
 146 #include <netinet6/ah.h>
 147 #if IPSEC_ESP
 148 #include <netinet6/esp.h>
 149 #endif
 150 #include <netinet6/ipcomp.h>
 151 #endif /*IPSEC*/
 152
 153 #include <netinet6/ip6protosw.h>
 154 #include <netinet/tcpip.h>
 155
 156 #include "gif.h"
 157 #if NGIF > 0
 158 #include <netinet6/in6_gif.h>
 159 #endif
 160
 161 #if MIP6
 162 #include <netinet6/mip6.h>
 163 #endif
 164
 165 #include <net/net_osdep.h>
 166
 167 #define offsetof(type, member)  ((size_t)(&((type *)0)->member))
 168
 169 /*
 170  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 171  */
 172
 173 extern  struct domain inet6domain;
 174 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
 175 static struct pr_usrreqs nousrreqs;
 176 #endif
 177
 178 struct ip6protosw inet6sw[] = {
 179 { 0,            &inet6domain,   IPPROTO_IPV6,   0,
 180   0,            0,              0,              0,
 181   0,
 182   ip6_init,     0,              frag6_slowtimo, frag6_drain,
 183   0, &nousrreqs
 184 },
 185 { SOCK_DGRAM,   &inet6domain,   IPPROTO_UDP,    PR_ATOMIC | PR_ADDR,
 186   udp6_input,   0,              udp6_ctlinput,  ip6_ctloutput,
 187   0,
 188   0,            0,              0,              0,
 189   0, &udp6_usrreqs
 190 },
 191 { SOCK_STREAM,  &inet6domain,   IPPROTO_TCP,    PR_CONNREQUIRED | PR_WANTRCVD,
 192   tcp6_input,   0,              tcp6_ctlinput,  tcp_ctloutput,
 193   0,
 194   tcp_init,     0,              0,              tcp_drain,
 195   0, &tcp6_usrreqs
 196 },
 197 { SOCK_RAW,     &inet6domain,   IPPROTO_RAW,    PR_ATOMIC | PR_ADDR,
 198   rip6_input,   rip6_output,    rip6_ctlinput,          rip6_ctloutput,
 199   0,
 200   0,            0,              0,              0,
 201   0, &rip6_usrreqs
 202 },
 203 { SOCK_RAW,     &inet6domain,   IPPROTO_ICMPV6, PR_ATOMIC | PR_ADDR,
 204   icmp6_input,  rip6_output,    0,              rip6_ctloutput,
 205   0,
 206   icmp6_init,   icmp6_fasttimo, 0,              0,
 207   0, &rip6_usrreqs
 208 },
 209 { SOCK_RAW,     &inet6domain,   IPPROTO_DSTOPTS,PR_ATOMIC|PR_ADDR,
 210   dest6_input,  0,              0,              0,
 211   0,
 212   0,            0,              0,              0,
 213   0, &nousrreqs
 214 },
 215 { SOCK_RAW,     &inet6domain,   IPPROTO_ROUTING,PR_ATOMIC|PR_ADDR,
 216   route6_input, 0,              0,              0,
 217   0,
 218   0,            0,              0,              0,
 219   0, &nousrreqs
 220 },
 221 { SOCK_RAW,     &inet6domain,   IPPROTO_FRAGMENT,PR_ATOMIC|PR_ADDR,
 222   frag6_input,  0,              0,              0,
 223   0,
 224   0,            0,              0,              0,
 225   0, &nousrreqs
 226 },
 227 #if IPSEC
 228 { SOCK_RAW,     &inet6domain,   IPPROTO_AH,     PR_ATOMIC|PR_ADDR,
 229   ah6_input,    0,              0,              0,
 230   0,
 231   0,            0,              0,              0,
 232   0, &nousrreqs
 233 },
 234 #if IPSEC_ESP
 235 { SOCK_RAW,     &inet6domain,   IPPROTO_ESP,    PR_ATOMIC|PR_ADDR,
 236   esp6_input,   0,              0,              0,
 237   0,
 238   0,            0,              0,              0,
 239   0, &nousrreqs
 240 },
 241 #endif
 242 { SOCK_RAW,     &inet6domain,   IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR,
 243   ipcomp6_input, 0,             0,              0,
 244   0,
 245   0,            0,              0,              0,
 246   0, &nousrreqs
 247 },
 248 #endif /* IPSEC */
 249 { SOCK_RAW,     &inet6domain,   IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR,
 250   encap6_input, rip6_output,    0,              rip6_ctloutput,
 251   0,
 252   0,            0,              0,              0,
 253   0, &nousrreqs
 254 },
 255 #if INET6
 256 { SOCK_RAW,     &inet6domain,   IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR,
 257   encap6_input, rip6_output,     0,     rip6_ctloutput,
 258   0,
 259   0,            0,              0,              0,
 260   0, &rip6_usrreqs
 261 },
 262 #endif /*INET6*/
 263 { SOCK_RAW,     &inet6domain,   IPPROTO_PIM,    PR_ATOMIC|PR_ADDR,
 264   pim6_input,    rip6_output,   0,              rip6_ctloutput,
 265   0,
 266   0,            0,              0,              0,
 267   0, &rip6_usrreqs
 268 },
 269 /* raw wildcard */
 270 { SOCK_RAW,     &inet6domain,   0,              PR_ATOMIC | PR_ADDR,
 271   rip6_input,   rip6_output,    0,              rip6_ctloutput,
 272   0,
 273   0,            0,              0,              0,
 274   0, &rip6_usrreqs
 275 },
 276 };
 277
 278 #if NGIF > 0
 279 struct ip6protosw in6_gif_protosw =
 280 { SOCK_RAW,     &inet6domain,   0/*IPPROTO_IPV[46]*/,   PR_ATOMIC|PR_ADDR,
 281   in6_gif_input, rip6_output,   0,              rip6_ctloutput,
 282   0,
 283   0,            0,              0,              0,
 284   0, &rip6_usrreqs
 285 };
 286 #endif /*NGIF*/
 287
 288 #if MIP6
 289 struct ip6protosw mip6_tunnel_protosw =
 290 { SOCK_RAW,     &inet6domain,   0/*IPPROTO_IPV[46]*/,   PR_ATOMIC|PR_ADDR,
 291   mip6_tunnel_input, rip6_output,       0,              rip6_ctloutput,
 292   0,
 293   0,            0,              0,              0,
 294   0, &rip6_usrreqs
 295 };
 296 #endif /* MIP6 */
 297
 298 extern int in6_inithead __P((void **, int));
 299 int in6_proto_count = (sizeof (inet6sw) / sizeof (struct ip6protosw));
 300 extern void in6_dinit(void);
 301
 302 struct domain inet6domain =
 303     { AF_INET6, "internet6", in6_dinit, 0, 0,
 304       inet6sw, 0,
 305       in6_inithead, offsetof(struct sockaddr_in6, sin6_addr) << 3, sizeof(struct sockaddr_in6) ,
 306       sizeof(struct sockaddr_in6), 0
 307     };
 308
 309 DOMAIN_SET(inet6);
 310
 311 /*
 312  * Internet configuration info
 313  */
 314 #ifndef IPV6FORWARDING
 315 #if GATEWAY6
 316 #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
 317 #else
 318 #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
 319 #endif /* GATEWAY6 */
 320 #endif /* !IPV6FORWARDING */
 321
 322 #ifndef IPV6_SENDREDIRECTS
 323 #define IPV6_SENDREDIRECTS      1
 324 #endif
 325
 326 int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
 327 int     ip6_sendredirects = IPV6_SENDREDIRECTS;
 328 int     ip6_defhlim = IPV6_DEFHLIM;
 329 int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
 330 int     ip6_accept_rtadv = 0;   /* "IPV6FORWARDING ? 0 : 1" is dangerous */
 331 int     ip6_maxfragpackets = 200;
 332 int     ip6_log_interval = 5;
 333 int     ip6_hdrnestlimit = 50;  /* appropriate? */
 334 int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
 335 u_int32_t ip6_flow_seq;
 336 int     ip6_auto_flowlabel = 1;
 337 #if NGIF > 0
 338 int     ip6_gif_hlim = GIF_HLIM;
 339 #else
 340 int     ip6_gif_hlim = 0;
 341 #endif
 342 int     ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
 343 int     ip6_rr_prune = 5;       /* router renumbering prefix
 344                                  * walk list every 5 sec.    */
 345 #if MAPPED_ADDR_ENABLED
 346 int     ip6_mapped_addr_on = 1;
 347 #endif /* MAPPED_ADDR_ENABLED */
 348
 349 u_int32_t ip6_id = 0UL;
 350 int     ip6_keepfaith = 0;
 351 time_t  ip6_log_time = (time_t)0L;
 352
 353 /* icmp6 */
 354 #ifndef __bsdi__
 355 /*
 356  * BSDI4 defines these variables in in_proto.c...
 357  * XXX: what if we don't define INET? Should we define pmtu6_expire
 358  * or so? (jinmei@kame.net 19990310)
 359  */
 360 int pmtu_expire = 60*10;
 361 int pmtu_probe = 60*2;
 362 #endif
 363
 364 /* raw IP6 parameters */
 365 /*
 366  * Nominal space allocated to a raw ip socket.
 367  */
 368 #define RIPV6SNDQ       8192
 369 #define RIPV6RCVQ       8192
 370
 371 u_long  rip6_sendspace = RIPV6SNDQ;
 372 u_long  rip6_recvspace = RIPV6RCVQ;
 373
 374 /* ICMPV6 parameters */
 375 int     icmp6_rediraccept = 1;          /* accept and process redirects */
 376 int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
 377 u_int   icmp6errratelim = 1000;         /* 1000usec = 1msec */
 378 int     icmp6_nodeinfo = 1;             /* enable/disable NI response */
 379
 380 #if TCP6
 381 /* TCP on IP6 parameters */
 382 int     tcp6_sendspace = 1024 * 8;
 383 int     tcp6_recvspace = 1024 * 8;
 384 int     tcp6_mssdflt = TCP6_MSS;
 385 int     tcp6_rttdflt = TCP6TV_SRTTDFLT / PR_SLOWHZ;
 386 int     tcp6_do_rfc1323 = 1;
 387 int     tcp6_conntimeo = TCP6TV_KEEP_INIT;      /* initial connection timeout */
 388 int     tcp6_43maxseg = 0;
 389 int     tcp6_pmtu = 0;
 390
 391 /*
 392  * Parameters for keepalive option.
 393  * Connections for which SO_KEEPALIVE is set will be probed
 394  * after being idle for a time of tcp6_keepidle (in units of PR_SLOWHZ).
 395  * Starting at that time, the connection is probed at intervals
 396  * of tcp6_keepintvl (same units) until a response is received
 397  * or until tcp6_keepcnt probes have been made, at which time
 398  * the connection is dropped.  Note that a tcp6_keepidle value
 399  * under 2 hours is nonconformant with RFC-1122, Internet Host Requirements.
 400  */
 401 int     tcp6_keepidle = TCP6TV_KEEP_IDLE;       /* time before probing idle */
 402 int     tcp6_keepintvl = TCP6TV_KEEPINTVL;      /* interval betwn idle probes */
 403 int     tcp6_keepcnt = TCP6TV_KEEPCNT;          /* max idle probes */
 404 int     tcp6_maxpersistidle = TCP6TV_KEEP_IDLE; /* max idle time in persist */
 405
 406 #ifndef INET_SERVER
 407 #define TCP6_LISTEN_HASH_SIZE   17
 408 #define TCP6_CONN_HASH_SIZE     97
 409 #define TCP6_SYN_HASH_SIZE      293
 410 #define TCP6_SYN_BUCKET_SIZE    35
 411 #else
 412 #define TCP6_LISTEN_HASH_SIZE   97
 413 #define TCP6_CONN_HASH_SIZE     9973
 414 #define TCP6_SYN_HASH_SIZE      997
 415 #define TCP6_SYN_BUCKET_SIZE    35
 416 #endif
 417 int     tcp6_listen_hash_size = TCP6_LISTEN_HASH_SIZE;
 418 int     tcp6_conn_hash_size = TCP6_CONN_HASH_SIZE;
 419 struct  tcp6_hash_list tcp6_listen_hash[TCP6_LISTEN_HASH_SIZE],
 420         tcp6_conn_hash[TCP6_CONN_HASH_SIZE];
 421
 422 int     tcp6_syn_cache_size = TCP6_SYN_HASH_SIZE;
 423 int     tcp6_syn_cache_limit = TCP6_SYN_HASH_SIZE*TCP6_SYN_BUCKET_SIZE;
 424 int     tcp6_syn_bucket_limit = 3*TCP6_SYN_BUCKET_SIZE;
 425 struct  syn_cache_head6 tcp6_syn_cache[TCP6_SYN_HASH_SIZE];
 426 struct  syn_cache_head6 *tcp6_syn_cache_first;
 427 int     tcp6_syn_cache_interval = 8;    /* runs timer every 4 seconds */
 428 int     tcp6_syn_cache_timeo = TCP6TV_KEEP_INIT;
 429
 430 /*
 431  * Parameters for computing a desirable data segment size
 432  * given an upper bound (either interface MTU, or peer's MSS option)_.
 433  * As applications tend to use a buffer size that is a multiple
 434  * of kilobytes, try for something that divides evenly. However,
 435  * do not round down too much.
 436  *
 437  * Round segment size down to a multiple of TCP6_ROUNDSIZE if this
 438  * does not result in lowering by more than (size/TCP6_ROUNDFRAC).
 439  * For example, round 536 to 512.  Older versions of the system
 440  * effectively used MCLBYTES (1K or 2K) as TCP6_ROUNDSIZE, with
 441  * a value of 1 for TCP6_ROUNDFRAC (eliminating its effect).
 442  * We round to a multiple of 256 for SLIP.
 443  */
 444 #ifndef TCP6_ROUNDSIZE
 445 #define TCP6_ROUNDSIZE  256     /* round to multiple of 256 */
 446 #endif
 447 #ifndef TCP6_ROUNDFRAC
 448 #define TCP6_ROUNDFRAC  10      /* round down at most N/10, or 10% */
 449 #endif
 450
 451 int     tcp6_roundsize = TCP6_ROUNDSIZE;
 452 int     tcp6_roundfrac = TCP6_ROUNDFRAC;
 453 #endif /*TCP6*/
 454
 455 /* UDP on IP6 parameters */
 456 int     udp6_sendspace = 9216;          /* really max datagram size */
 457 int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
 458                                         /* 40 1K datagrams */
 459
 460 #if defined(__FreeBSD__) || defined(__APPLE__)
 461 /*
 462  * sysctl related items.
 463  */
 464 SYSCTL_NODE(_net,       PF_INET6,       inet6,  CTLFLAG_RW,     0,
 465         "Internet6 Family");
 466
 467 /* net.inet6 */
 468 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6,   ip6,    CTLFLAG_RW, 0,  "IP6");
 469 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6,  CTLFLAG_RW, 0,  "ICMP6");
 470 SYSCTL_NODE(_net_inet6, IPPROTO_UDP,    udp6,   CTLFLAG_RW, 0,  "UDP6");
 471 SYSCTL_NODE(_net_inet6, IPPROTO_TCP,    tcp6,   CTLFLAG_RW, 0,  "TCP6");
 472 #if IPSEC
 473 SYSCTL_NODE(_net_inet6, IPPROTO_ESP,    ipsec6, CTLFLAG_RW, 0,  "IPSEC6");
 474 #endif /* IPSEC */
 475
 476 /* net.inet6.ip6 */
 477 static int
 478 sysctl_ip6_forwarding SYSCTL_HANDLER_ARGS
 479 {
 480         int error = 0;
 481         int old_ip6_forwarding;
 482         int changed;
 483
 484         error = SYSCTL_OUT(req, arg1, sizeof(int));
 485         if (error || !req->newptr)
 486                 return (error);
 487         old_ip6_forwarding = ip6_forwarding;
 488         error = SYSCTL_IN(req, arg1, sizeof(int));
 489         if (error != 0)
 490                 return (error);
 491         changed = (ip6_forwarding ? 1 : 0) ^ (old_ip6_forwarding ? 1 : 0);
 492         if (changed == 0)
 493                 return (error);
 494         /*
 495          * XXX while host->router removes prefix got from RA,
 496          * router->host case nukes all the prefixes managed by in6_prefix.c
 497          * (both RR and static).  therefore, switching from host->router->host
 498          * will remove statically configured addresses/prefixes.
 499          * not sure if it is intended behavior or not.
 500          */
 501         if (ip6_forwarding != 0) {      /* host becomes router */
 502                 int s = splnet();
 503                 struct nd_prefix *pr, *next;
 504
 505                 for (pr = nd_prefix.lh_first; pr; pr = next) {
 506                         next = pr->ndpr_next;
 507                         if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
 508                                 in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
 509                         prelist_remove(pr);
 510                 }
 511                 splx(s);
 512         } else {                        /* router becomes host */
 513                 while(!LIST_EMPTY(&rr_prefix))
 514                         delete_each_prefix(LIST_FIRST(&rr_prefix),
 515                                            PR_ORIG_KERNEL);
 516         }
 517
 518         return (error);
 519 }
 520
 521 SYSCTL_OID(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
 522            CTLTYPE_INT|CTLFLAG_RW, &ip6_forwarding, 0, sysctl_ip6_forwarding,
 523            "I", "");
 524 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
 525         redirect, CTLFLAG_RW,           &ip6_sendredirects,     0, "");
 526 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
 527         hlim, CTLFLAG_RW,               &ip6_defhlim,   0, "");
 528 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS,
 529         maxfragpackets, CTLFLAG_RW,     &ip6_maxfragpackets,    0, "");
 530 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
 531         accept_rtadv, CTLFLAG_RW,       &ip6_accept_rtadv,      0, "");
 532 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
 533         keepfaith, CTLFLAG_RW,          &ip6_keepfaith, 0, "");
 534 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
 535         log_interval, CTLFLAG_RW,       &ip6_log_interval,      0, "");
 536 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
 537         hdrnestlimit, CTLFLAG_RW,       &ip6_hdrnestlimit,      0, "");
 538 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
 539         dad_count, CTLFLAG_RW,  &ip6_dad_count, 0, "");
 540 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
 541         auto_flowlabel, CTLFLAG_RW,     &ip6_auto_flowlabel,    0, "");
 542 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
 543         defmcasthlim, CTLFLAG_RW,       &ip6_defmcasthlim,      0, "");
 544 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
 545         gifhlim, CTLFLAG_RW,    &ip6_gif_hlim,                  0, "");
 546 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
 547         kame_version, CTLFLAG_RD,       __KAME_VERSION,         0, "");
 548 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
 549         use_deprecated, CTLFLAG_RW,     &ip6_use_deprecated,    0, "");
 550 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
 551         rr_prune, CTLFLAG_RW,   &ip6_rr_prune,                  0, "");
 552 #if MAPPED_ADDR_ENABLED
 553 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAPPED_ADDR,
 554         mapped_addr, CTLFLAG_RW,        &ip6_mapped_addr_on,    0, "");
 555 #endif /* MAPPED_ADDR_ENABLED */
 556
 557 /* net.inet6.icmp6 */
 558 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
 559         rediraccept, CTLFLAG_RW,        &icmp6_rediraccept,     0, "");
 560 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
 561         redirtimeout, CTLFLAG_RW,       &icmp6_redirtimeout,    0, "");
 562 SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
 563         &icmp6stat, icmp6stat, "");
 564 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRRATELIMIT,
 565         errratelimit, CTLFLAG_RW,       &icmp6errratelim,       0, "");
 566 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
 567         nd6_prune, CTLFLAG_RW,          &nd6_prune,     0, "");
 568 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
 569         nd6_delay, CTLFLAG_RW,          &nd6_delay,     0, "");
 570 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
 571         nd6_umaxtries, CTLFLAG_RW,      &nd6_umaxtries, 0, "");
 572 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
 573         nd6_mmaxtries, CTLFLAG_RW,      &nd6_mmaxtries, 0, "");
 574 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
 575         nd6_useloopback, CTLFLAG_RW,    &nd6_useloopback, 0, "");
 576 //SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PROXYALL,
 577 //      nd6_proxyall, CTLFLAG_RW,       &nd6_proxyall, 0, "");
 578 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
 579         nodeinfo, CTLFLAG_RW,   &icmp6_nodeinfo,        0, "");
 580
 581
 582 #if defined(__FreeBSD__) && __FreeBSD__ < 3
 583 /* net.inet6.udp6 */
 584 SYSCTL_INT(_net_inet6_udp6, UDP6CTL_SENDMAX,
 585         sendmax, CTLFLAG_RW,    &udp6_sendspace,        0, "");
 586 SYSCTL_INT(_net_inet6_udp6, UDP6CTL_RECVSPACE,
 587         recvspace, CTLFLAG_RW,  &udp6_recvspace,        0, "");
 588
 589 /* net.inet6.tcp6 */
 590 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_MSSDFLT,
 591         mssdflt, CTLFLAG_RW,    &tcp6_mssdflt, 0, "");
 592 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_DO_RFC1323,
 593         do_rfc1323, CTLFLAG_RW, &tcp6_do_rfc1323, 0, "");
 594 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_KEEPIDLE,
 595         keepidle, CTLFLAG_RW,   &tcp6_keepidle, 0, "");
 596 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_KEEPINTVL,
 597         keepintvl, CTLFLAG_RW,  &tcp6_keepintvl, 0, "");
 598 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_KEEPCNT,
 599         keepcnt, CTLFLAG_RW,    &tcp6_keepcnt, 0, "");
 600 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_MAXPERSISTIDLE,
 601         maxpersistidle, CTLFLAG_RW,     &tcp6_maxpersistidle, 0, "");
 602 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_SENDSPACE,
 603         sendspace, CTLFLAG_RW,  &tcp6_sendspace, 0, "");
 604 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_RECVSPACE,
 605         recvspace, CTLFLAG_RW,  &tcp6_recvspace, 0, "");
 606 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_CONNTIMEO,
 607         conntimeo, CTLFLAG_RW,  &tcp6_conntimeo, 0, "");
 608 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_PMTU,
 609         pmtu, CTLFLAG_RW,       &tcp6_pmtu, 0, "");
 610 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_PMTU_EXPIRE,
 611         pmtu_expire, CTLFLAG_RW,        &pmtu_expire, 0, "");
 612 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_PMTU_PROBE,
 613         pmtu_probe, CTLFLAG_RW, &pmtu_probe, 0, "");
 614 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_43MAXSEG,
 615         pmtu_43maxseg, CTLFLAG_RW,      &tcp6_43maxseg, 0, "");
 616 SYSCTL_STRUCT(_net_inet6_tcp6, TCP6CTL_STATS, stats, CTLFLAG_RD,
 617         &tcp6stat, tcp6stat, "");
 618 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_SYN_CACHE_LIMIT,
 619         syn_cache_limit, CTLFLAG_RW,    &tcp6_syn_cache_limit, 0, "");
 620 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_SYN_BUCKET_LIMIT,
 621         syn_bucket_limit, CTLFLAG_RW,   &tcp6_syn_bucket_limit, 0, "");
 622 SYSCTL_INT(_net_inet6_tcp6, TCP6CTL_SYN_CACHE_INTER,
 623         syn_cache_interval, CTLFLAG_RW, &tcp6_syn_cache_interval, 0, "");
 624 #endif /* !(defined(__FreeBSD__) && __FreeBSD__ >= 3) */
 625
 626 #endif /* __FreeBSD__ */