1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in_proto.c 8.1 (Berkeley) 6/10/93 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_ipstealth.h" 72 #include "opt_sctp.h" 73 #include "opt_route.h" 74 75 #include <sys/param.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/jail.h> 81 #include <sys/kernel.h> 82 #include <sys/malloc.h> 83 #include <sys/domain.h> 84 #include <sys/mbuf.h> 85 #include <sys/systm.h> 86 #include <sys/sysctl.h> 87 88 #include <net/if.h> 89 #include <net/if_var.h> 90 #include <netinet/in.h> 91 #include <netinet/ip6.h> 92 #include <netinet6/in6_var.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/raw_ip6.h> 97 98 /* netinet6/raw_ip6.c */ 99 extern struct protosw rip6_protosw; 100 /* netinet6/udp6_usrreq.c */ 101 extern struct protosw udp6_protosw, udplite6_protosw; 102 /* netinet/tcp_usrreq.c */ 103 extern struct protosw tcp6_protosw; 104 /* netinet/sctp6_usrreq.c */ 105 extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw; 106 107 /* 108 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 109 */ 110 FEATURE(inet6, "Internet Protocol version 6"); 111 112 struct domain inet6domain = { 113 .dom_family = AF_INET6, 114 .dom_name = "internet6", 115 .dom_rtattach = in6_inithead, 116 #ifdef VIMAGE 117 .dom_rtdetach = in6_detachhead, 118 #endif 119 .dom_ifattach = in6_domifattach, 120 .dom_ifdetach = in6_domifdetach, 121 .dom_ifmtu = in6_domifmtu, 122 .dom_nprotosw = 14, 123 .dom_protosw = { 124 &tcp6_protosw, 125 &udp6_protosw, 126 #ifdef SCTP 127 &sctp6_seqpacket_protosw, 128 &sctp6_stream_protosw, 129 #else 130 NULL, NULL, 131 #endif 132 &udplite6_protosw, 133 &rip6_protosw, 134 /* Spacer 8 times for loadable protocols. XXXGL: why 8? */ 135 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 136 }, 137 }; 138 139 DOMAIN_SET(inet6); 140 141 /* 142 * Internet configuration info 143 */ 144 #ifndef IPV6FORWARDING 145 #ifdef GATEWAY6 146 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 147 #else 148 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 149 #endif /* GATEWAY6 */ 150 #endif /* !IPV6FORWARDING */ 151 152 #ifndef IPV6_SENDREDIRECTS 153 #define IPV6_SENDREDIRECTS 1 154 #endif 155 156 VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING; /* act as router? */ 157 VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS; 158 VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM; 159 VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS; 160 VNET_DEFINE(int, ip6_accept_rtadv) = 0; 161 VNET_DEFINE(int, ip6_no_radr) = 0; 162 VNET_DEFINE(int, ip6_norbit_raif) = 0; 163 VNET_DEFINE(int, ip6_rfc6204w3) = 0; 164 VNET_DEFINE(int, ip6_log_interval) = 5; 165 VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we 166 * process? */ 167 VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */ 168 VNET_DEFINE(int, ip6_auto_flowlabel) = 1; 169 VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr 170 * (RFC2462 5.5.4) */ 171 VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix 172 * walk list every 5 sec. */ 173 VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */ 174 VNET_DEFINE(int, ip6_v6only) = 1; 175 176 VNET_DEFINE(time_t, ip6_log_time) = (time_t)0L; 177 #ifdef IPSTEALTH 178 VNET_DEFINE(int, ip6stealth) = 0; 179 #endif 180 VNET_DEFINE(int, nd6_onlink_ns_rfc4861) = 0;/* allow 'on-link' nd6 NS 181 * (RFC 4861) */ 182 183 /* icmp6 */ 184 /* 185 * BSDI4 defines these variables in in_proto.c... 186 * XXX: what if we don't define INET? Should we define pmtu6_expire 187 * or so? (jinmei@kame.net 19990310) 188 */ 189 VNET_DEFINE(int, pmtu_expire) = 60*10; 190 VNET_DEFINE(int, pmtu_probe) = 60*2; 191 192 /* ICMPV6 parameters */ 193 VNET_DEFINE(int, icmp6_rediraccept) = 1;/* accept and process redirects */ 194 VNET_DEFINE(int, icmp6_redirtimeout) = 10 * 60; /* 10 minutes */ 195 VNET_DEFINE(int, icmp6errppslim) = 100; /* 100pps */ 196 /* control how to respond to NI queries */ 197 VNET_DEFINE(int, icmp6_nodeinfo) = 198 (ICMP6_NODEINFO_FQDNOK|ICMP6_NODEINFO_NODEADDROK); 199 VNET_DEFINE(int, icmp6_nodeinfo_oldmcprefix) = 1; 200 201 /* 202 * sysctl related items. 203 */ 204 SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 205 "Internet6 Family"); 206 207 /* net.inet6 */ 208 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 209 "IP6"); 210 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 211 "ICMP6"); 212 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 213 "UDP6"); 214 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 215 "TCP6"); 216 #if defined(SCTP) || defined(SCTP_SUPPORT) 217 SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 218 "SCTP6"); 219 #endif 220 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 221 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 222 "IPSEC6"); 223 #endif /* IPSEC */ 224 225 /* net.inet6.ip6 */ 226 static int 227 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS) 228 { 229 int error, val; 230 231 val = V_ip6_temp_preferred_lifetime; 232 error = sysctl_handle_int(oidp, &val, 0, req); 233 if (error != 0 || !req->newptr) 234 return (error); 235 if (val < V_ip6_desync_factor + V_ip6_temp_regen_advance) 236 return (EINVAL); 237 V_ip6_temp_preferred_lifetime = val; 238 return (0); 239 } 240 241 static int 242 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS) 243 { 244 int error, val; 245 246 val = V_ip6_temp_valid_lifetime; 247 error = sysctl_handle_int(oidp, &val, 0, req); 248 if (error != 0 || !req->newptr) 249 return (error); 250 if (val < V_ip6_temp_preferred_lifetime) 251 return (EINVAL); 252 V_ip6_temp_valid_lifetime = val; 253 return (0); 254 } 255 256 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding, 257 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0, 258 "Enable forwarding of IPv6 packets between interfaces"); 259 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect, 260 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0, 261 "Send ICMPv6 redirects for unforwardable IPv6 packets"); 262 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim, 263 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0, 264 "Default hop limit to use for outgoing IPv6 packets"); 265 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat, 266 ip6stat, 267 "IP6 statistics (struct ip6stat, netinet6/ip6_var.h)"); 268 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv, 269 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_accept_rtadv), 0, 270 "Default value of per-interface flag for accepting ICMPv6 RA messages"); 271 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr, 272 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_no_radr), 0, 273 "Default value of per-interface flag to control whether routers " 274 "sending ICMPv6 RA messages on that interface are added into the " 275 "default router list"); 276 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif, 277 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0, 278 "Always set clear the R flag in ICMPv6 NA messages when accepting RA " 279 "on the interface"); 280 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3, 281 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0, 282 "Accept the default router list from ICMPv6 RA messages even " 283 "when packet forwarding is enabled"); 284 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval, 285 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0, 286 "Frequency in seconds at which to log IPv6 forwarding errors"); 287 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit, 288 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0, 289 "Default maximum number of IPv6 extension headers permitted on " 290 "incoming IPv6 packets, 0 for no artificial limit"); 291 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count, 292 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0, 293 "Number of ICMPv6 NS messages sent during duplicate address detection"); 294 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel, 295 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0, 296 "Provide an IPv6 flowlabel in outbound packets"); 297 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim, 298 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0, 299 "Default hop limit for IPv6 multicast packets originating from this " 300 "node"); 301 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version, 302 CTLFLAG_RD, __KAME_VERSION, 0, 303 "KAME version string"); 304 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated, 305 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0, 306 "Allow the use of addresses whose preferred lifetimes have expired"); 307 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune, 308 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0, 309 ""); /* XXX unused */ 310 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr, 311 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0, 312 "Create RFC3041 temporary addresses for autoconfigured addresses"); 313 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime, 314 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 315 NULL, 0, sysctl_ip6_temppltime, "I", 316 "Maximum preferred lifetime for temporary addresses"); 317 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime, 318 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 319 NULL, 0, sysctl_ip6_tempvltime, "I", 320 "Maximum valid lifetime for temporary addresses"); 321 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only, 322 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0, 323 "Restrict AF_INET6 sockets to IPv6 addresses only"); 324 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal, 325 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_linklocal), 0, 326 "Default value of per-interface flag for automatically adding an IPv6 " 327 "link-local address to interfaces when attached"); 328 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, 329 struct rip6stat, rip6stat, 330 "Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)"); 331 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr, 332 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0, 333 "Prefer RFC3041 temporary addresses in source address selection"); 334 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone, 335 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0, 336 "Use the default scope zone when none is specified"); 337 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu, 338 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0, 339 "Enable path MTU discovery for multicast packets"); 340 #ifdef IPSTEALTH 341 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW, 342 &VNET_NAME(ip6stealth), 0, 343 "Forward IPv6 packets without decrementing their TTL"); 344 #endif 345 346 /* net.inet6.icmp6 */ 347 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept, 348 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0, 349 "Accept ICMPv6 redirect messages"); 350 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout, 351 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0, 352 "Delay in seconds before expiring redirect route"); 353 SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, 354 struct icmp6stat, icmp6stat, 355 "ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)"); 356 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune, 357 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_prune), 0, 358 "Frequency in seconds of checks for expired prefixes and routers"); 359 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay, 360 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_delay), 0, 361 "Delay in seconds before probing for reachability"); 362 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries, 363 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_umaxtries), 0, 364 "Number of ICMPv6 NS messages sent during reachability detection"); 365 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries, 366 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_mmaxtries), 0, 367 "Number of ICMPv6 NS messages sent during address resolution"); 368 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback, 369 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0, 370 "Create a loopback route when configuring an IPv6 address"); 371 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo, 372 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0, 373 "Mask of enabled RFC4620 node information query types"); 374 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX, 375 nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW, 376 &VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0, 377 "Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup " 378 "for compatibility with KAME implementation"); 379 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit, 380 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0, 381 "Maximum number of ICMPv6 error messages per second"); 382 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT, nd6_maxnudhint, 383 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxnudhint), 0, 384 ""); /* XXX unused */ 385 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug, 386 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_debug), 0, 387 "Log NDP debug messages"); 388 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861, 389 nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW, 390 &VNET_NAME(nd6_onlink_ns_rfc4861), 0, 391 "Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861"); 392 #ifdef EXPERIMENTAL 393 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, 394 nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW, 395 &VNET_NAME(nd6_ignore_ipv6_only_ra), 0, 396 "Ignore the 'IPv6-Only flag' in RA messages in compliance with " 397 "draft-ietf-6man-ipv6only-flag"); 398 #endif 399