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 63 #include <sys/cdefs.h> 64 #include "opt_inet.h" 65 #include "opt_inet6.h" 66 #include "opt_ipsec.h" 67 #include "opt_ipstealth.h" 68 #include "opt_sctp.h" 69 #include "opt_route.h" 70 71 #include <sys/param.h> 72 #include <sys/socket.h> 73 #include <sys/socketvar.h> 74 #include <sys/proc.h> 75 #include <sys/protosw.h> 76 #include <sys/jail.h> 77 #include <sys/kernel.h> 78 #include <sys/malloc.h> 79 #include <sys/domain.h> 80 #include <sys/mbuf.h> 81 #include <sys/systm.h> 82 #include <sys/sysctl.h> 83 84 #include <net/if.h> 85 #include <net/if_var.h> 86 #include <netinet/in.h> 87 #include <netinet/ip6.h> 88 #include <netinet6/in6_var.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/nd6.h> 92 #include <netinet6/raw_ip6.h> 93 94 /* netinet6/raw_ip6.c */ 95 extern struct protosw rip6_protosw; 96 /* netinet6/udp6_usrreq.c */ 97 extern struct protosw udp6_protosw, udplite6_protosw; 98 /* netinet/tcp_usrreq.c */ 99 extern struct protosw tcp6_protosw; 100 /* netinet/sctp6_usrreq.c */ 101 extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw; 102 103 /* 104 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 105 */ 106 FEATURE(inet6, "Internet Protocol version 6"); 107 108 struct domain inet6domain = { 109 .dom_family = AF_INET6, 110 .dom_name = "internet6", 111 .dom_rtattach = in6_inithead, 112 #ifdef VIMAGE 113 .dom_rtdetach = in6_detachhead, 114 #endif 115 .dom_ifattach = in6_domifattach, 116 .dom_ifdetach = in6_domifdetach, 117 .dom_ifmtu = in6_domifmtu, 118 .dom_nprotosw = 14, 119 .dom_protosw = { 120 &tcp6_protosw, 121 &udp6_protosw, 122 #ifdef SCTP 123 &sctp6_seqpacket_protosw, 124 &sctp6_stream_protosw, 125 #else 126 NULL, NULL, 127 #endif 128 &udplite6_protosw, 129 &rip6_protosw, 130 /* Spacer 8 times for loadable protocols. XXXGL: why 8? */ 131 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 132 }, 133 }; 134 135 DOMAIN_SET(inet6); 136 137 /* 138 * Internet configuration info 139 */ 140 #ifndef IPV6FORWARDING 141 #ifdef GATEWAY6 142 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 143 #else 144 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 145 #endif /* GATEWAY6 */ 146 #endif /* !IPV6FORWARDING */ 147 148 #ifndef IPV6_SENDREDIRECTS 149 #define IPV6_SENDREDIRECTS 1 150 #endif 151 152 VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING; /* act as router? */ 153 VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS; 154 VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM; 155 VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS; 156 VNET_DEFINE(int, ip6_accept_rtadv) = 0; 157 VNET_DEFINE(int, ip6_no_radr) = 0; 158 VNET_DEFINE(int, ip6_norbit_raif) = 0; 159 VNET_DEFINE(int, ip6_rfc6204w3) = 0; 160 VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we 161 * process? */ 162 VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */ 163 VNET_DEFINE(int, ip6_auto_flowlabel) = 1; 164 VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr 165 * (RFC2462 5.5.4) */ 166 VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix 167 * walk list every 5 sec. */ 168 VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */ 169 VNET_DEFINE(int, ip6_v6only) = 1; 170 VNET_DEFINE(u_int, ip6_stableaddr_maxretries) = IP6_IDGEN_RETRIES; 171 172 #ifdef IPSTEALTH 173 VNET_DEFINE(int, ip6stealth) = 0; 174 #endif 175 VNET_DEFINE(bool, ip6_log_cannot_forward) = 1; 176 177 /* 178 * BSDI4 defines these variables in in_proto.c... 179 * XXX: what if we don't define INET? Should we define pmtu6_expire 180 * or so? (jinmei@kame.net 19990310) 181 */ 182 VNET_DEFINE(int, pmtu_expire) = 60*10; 183 VNET_DEFINE(int, pmtu_probe) = 60*2; 184 185 VNET_DEFINE_STATIC(int, ip6_log_interval) = 5; 186 VNET_DEFINE_STATIC(int, ip6_log_count) = 0; 187 VNET_DEFINE_STATIC(struct timeval, ip6_log_last) = { 0 }; 188 189 #define V_ip6_log_interval VNET(ip6_log_interval) 190 #define V_ip6_log_count VNET(ip6_log_count) 191 #define V_ip6_log_last VNET(ip6_log_last) 192 193 /* 194 * sysctl related items. 195 */ 196 SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 197 "Internet6 Family"); 198 199 /* net.inet6 */ 200 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 201 "IP6"); 202 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 203 "ICMP6"); 204 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 205 "UDP6"); 206 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 207 "TCP6"); 208 #if defined(SCTP) || defined(SCTP_SUPPORT) 209 SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 210 "SCTP6"); 211 #endif 212 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 213 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 214 "IPSEC6"); 215 #endif /* IPSEC */ 216 217 /* net.inet6.ip6 */ 218 static int 219 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS) 220 { 221 int error, val, ndf; 222 223 val = V_ip6_temp_preferred_lifetime; 224 error = sysctl_handle_int(oidp, &val, 0, req); 225 if (error != 0 || !req->newptr) 226 return (error); 227 ndf = TEMP_MAX_DESYNC_FACTOR_BASE + (val >> 2) + (val >> 3); 228 if (val < ndf + V_ip6_temp_regen_advance || 229 val > V_ip6_temp_valid_lifetime) 230 return (EINVAL); 231 V_ip6_temp_preferred_lifetime = val; 232 V_ip6_temp_max_desync_factor = ndf; 233 V_ip6_desync_factor = arc4random() % ndf; 234 return (0); 235 } 236 237 static int 238 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS) 239 { 240 int error, val; 241 242 val = V_ip6_temp_valid_lifetime; 243 error = sysctl_handle_int(oidp, &val, 0, req); 244 if (error != 0 || !req->newptr) 245 return (error); 246 if (val < V_ip6_temp_preferred_lifetime) 247 return (EINVAL); 248 V_ip6_temp_valid_lifetime = val; 249 return (0); 250 } 251 252 int 253 ip6_log_ratelimit(void) 254 { 255 256 return (ppsratecheck(&V_ip6_log_last, &V_ip6_log_count, 257 V_ip6_log_interval)); 258 } 259 260 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding, 261 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0, 262 "Enable forwarding of IPv6 packets between interfaces"); 263 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect, 264 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0, 265 "Send ICMPv6 redirects for unforwardable IPv6 packets"); 266 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim, 267 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0, 268 "Default hop limit to use for outgoing IPv6 packets"); 269 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat, 270 ip6stat, 271 "IP6 statistics (struct ip6stat, netinet6/ip6_var.h)"); 272 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv, 273 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_accept_rtadv), 0, 274 "Default value of per-interface flag for accepting ICMPv6 RA messages"); 275 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr, 276 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_no_radr), 0, 277 "Default value of per-interface flag to control whether routers " 278 "sending ICMPv6 RA messages on that interface are added into the " 279 "default router list"); 280 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif, 281 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0, 282 "Always set clear the R flag in ICMPv6 NA messages when accepting RA " 283 "on the interface"); 284 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3, 285 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0, 286 "Accept the default router list from ICMPv6 RA messages even " 287 "when packet forwarding is enabled"); 288 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval, 289 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0, 290 "Frequency in seconds at which to log IPv6 forwarding errors"); 291 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit, 292 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0, 293 "Default maximum number of IPv6 extension headers permitted on " 294 "incoming IPv6 packets, 0 for no artificial limit"); 295 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count, 296 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0, 297 "Number of ICMPv6 NS messages sent during duplicate address detection"); 298 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel, 299 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0, 300 "Provide an IPv6 flowlabel in outbound packets"); 301 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim, 302 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0, 303 "Default hop limit for IPv6 multicast packets originating from this " 304 "node"); 305 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version, 306 CTLFLAG_RD, __KAME_VERSION, 0, 307 "KAME version string"); 308 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated, 309 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0, 310 "Allow the use of addresses whose preferred lifetimes have expired"); 311 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune, 312 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0, 313 ""); /* XXX unused */ 314 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr, 315 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0, 316 "Create RFC3041 temporary addresses for autoconfigured addresses"); 317 SYSCTL_BOOL(_net_inet6_ip6, IPV6CTL_USESTABLEADDR, use_stableaddr, 318 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_use_stableaddr), 0, 319 "Create RFC7217 semantically opaque address for autoconfigured addresses (default for new interfaces)"); 320 SYSCTL_UINT(_net_inet6_ip6, IPV6CTL_STABLEADDR_MAXRETRIES, stableaddr_maxretries, 321 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_stableaddr_maxretries), IP6_IDGEN_RETRIES, 322 "RFC7217 semantically opaque address DAD max retries"); 323 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STABLEADDR_NETIFSRC, stableaddr_netifsource, 324 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_stableaddr_netifsource), IP6_STABLEADDR_NETIFSRC_NAME, 325 "RFC7217 semantically opaque address Net_Iface source (0 - name, 1 - ID, 2 - MAC addr)"); 326 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime, 327 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 328 NULL, 0, sysctl_ip6_temppltime, "I", 329 "Maximum preferred lifetime for temporary addresses"); 330 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime, 331 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 332 NULL, 0, sysctl_ip6_tempvltime, "I", 333 "Maximum valid lifetime for temporary addresses"); 334 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only, 335 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0, 336 "Restrict AF_INET6 sockets to IPv6 addresses only"); 337 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal, 338 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_auto_linklocal), 0, 339 "Default value of per-interface flag for automatically adding an IPv6 " 340 "link-local address to interfaces when attached"); 341 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, 342 struct rip6stat, rip6stat, 343 "Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)"); 344 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr, 345 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0, 346 "Prefer RFC3041 temporary addresses in source address selection"); 347 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone, 348 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0, 349 "Use the default scope zone when none is specified"); 350 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu, 351 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0, 352 "Enable path MTU discovery for multicast packets"); 353 #ifdef IPSTEALTH 354 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW, 355 &VNET_NAME(ip6stealth), 0, 356 "Forward IPv6 packets without decrementing their TTL"); 357 #endif 358 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, 359 log_cannot_forward, CTLFLAG_VNET | CTLFLAG_RW, 360 &VNET_NAME(ip6_log_cannot_forward), 1, 361 "Log packets that cannot be forwarded"); 362