1 /* $OpenBSD: in6_proto.c,v 1.62 2011/03/31 10:36:42 jasper Exp $ */ 2 /* $KAME: in6_proto.c,v 1.66 2000/10/10 15:35:47 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in_proto.c 8.1 (Berkeley) 6/10/93 62 */ 63 64 #include <sys/param.h> 65 #include <sys/socket.h> 66 #include <sys/protosw.h> 67 #include <sys/kernel.h> 68 #include <sys/domain.h> 69 #include <sys/mbuf.h> 70 71 #include <net/if.h> 72 #include <net/radix.h> 73 #ifndef SMALL_KERNEL 74 #include <net/radix_mpath.h> 75 #endif 76 #include <net/route.h> 77 78 #include <netinet/in.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/in_var.h> 81 #include <netinet/ip.h> 82 #include <netinet/ip_var.h> 83 #include <netinet/in_pcb.h> 84 #include <netinet/ip6.h> 85 #include <netinet6/ip6_var.h> 86 #include <netinet/icmp6.h> 87 88 #include <netinet/tcp.h> 89 #include <netinet/tcp_timer.h> 90 #include <netinet/tcp_var.h> 91 #include <netinet/udp.h> 92 #include <netinet/udp_var.h> 93 #include <netinet/ip_ipsp.h> 94 #include <netinet/ip_ah.h> 95 #include <netinet/ip_esp.h> 96 #include <netinet/ip_ipip.h> 97 98 #ifdef MROUTING 99 #include <netinet6/pim6_var.h> 100 #endif 101 102 #include <netinet6/nd6.h> 103 104 #include <netinet6/ip6protosw.h> 105 106 #include "gif.h" 107 #if NGIF > 0 108 #include <netinet6/in6_gif.h> 109 #endif 110 111 #include "carp.h" 112 #if NCARP > 0 113 #include <netinet/ip_carp.h> 114 #endif 115 116 #include "pf.h" 117 #if NPF > 0 118 #include <netinet6/ip6_divert.h> 119 #endif 120 121 /* 122 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 123 */ 124 125 extern struct domain inet6domain; 126 127 struct ip6protosw inet6sw[] = { 128 { 0, &inet6domain, IPPROTO_IPV6, 0, 129 0, 0, 0, 0, 130 0, 131 ip6_init, 0, frag6_slowtimo, frag6_drain, 132 ip6_sysctl, 133 }, 134 { SOCK_DGRAM, &inet6domain, IPPROTO_UDP, PR_ATOMIC|PR_ADDR, 135 udp6_input, 0, udp6_ctlinput, ip6_ctloutput, 136 udp_usrreq, 0, 137 0, 0, 0, 138 udp_sysctl, 139 }, 140 { SOCK_STREAM, &inet6domain, IPPROTO_TCP, PR_CONNREQUIRED|PR_WANTRCVD|PR_ABRTACPTDIS|PR_SPLICE, 141 tcp6_input, 0, tcp6_ctlinput, tcp_ctloutput, 142 tcp_usrreq, 143 #ifdef INET /* don't call initialization and timeout routines twice */ 144 0, 0, 0, 0, 145 #else 146 tcp_init, tcp_fasttimo, tcp_slowtimo, 0, 147 #endif 148 tcp_sysctl, 149 }, 150 { SOCK_RAW, &inet6domain, IPPROTO_RAW, PR_ATOMIC|PR_ADDR, 151 rip6_input, rip6_output, rip6_ctlinput, rip6_ctloutput, 152 rip6_usrreq, 153 0, 0, 0, 0, rip6_sysctl 154 }, 155 { SOCK_RAW, &inet6domain, IPPROTO_ICMPV6, PR_ATOMIC|PR_ADDR, 156 icmp6_input, rip6_output, rip6_ctlinput, rip6_ctloutput, 157 rip6_usrreq, 158 icmp6_init, icmp6_fasttimo, 0, 0, 159 icmp6_sysctl, 160 }, 161 { SOCK_RAW, &inet6domain, IPPROTO_DSTOPTS,PR_ATOMIC|PR_ADDR, 162 dest6_input, 0, 0, 0, 163 0, 164 0, 0, 0, 0, 165 }, 166 { SOCK_RAW, &inet6domain, IPPROTO_ROUTING,PR_ATOMIC|PR_ADDR, 167 route6_input, 0, 0, 0, 168 0, 169 0, 0, 0, 0, 170 }, 171 { SOCK_RAW, &inet6domain, IPPROTO_FRAGMENT,PR_ATOMIC|PR_ADDR, 172 frag6_input, 0, 0, 0, 173 0, 174 0, 0, 0, 0, 175 }, 176 #ifdef IPSEC 177 { SOCK_RAW, &inet6domain, IPPROTO_AH, PR_ATOMIC|PR_ADDR, 178 ah6_input, 0, 0, 0, 179 0, 180 0, 0, 0, 0, 181 ah_sysctl, 182 }, 183 { SOCK_RAW, &inet6domain, IPPROTO_ESP, PR_ATOMIC|PR_ADDR, 184 esp6_input, 0, 0, 0, 185 0, 186 0, 0, 0, 0, 187 esp_sysctl, 188 }, 189 { SOCK_RAW, &inet6domain, IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR, 190 ipcomp6_input, 0, 0, 0, 191 0, 192 0, 0, 0, 0, 193 ipcomp_sysctl, 194 }, 195 #endif /* IPSEC */ 196 #if NGIF > 0 197 { SOCK_RAW, &inet6domain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 198 in6_gif_input, rip6_output, 0, rip6_ctloutput, 199 rip6_usrreq, /* XXX */ 200 0, 0, 0, 0, 201 }, 202 #ifdef INET 203 { SOCK_RAW, &inet6domain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR, 204 in6_gif_input, rip6_output, 0, rip6_ctloutput, 205 rip6_usrreq, /* XXX */ 206 0, 0, 0, 0, 207 }, 208 #endif /* INET */ 209 #else /* NGIF */ 210 { SOCK_RAW, &inet6domain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR, 211 ip4_input6, rip6_output, 0, rip6_ctloutput, 212 rip6_usrreq, /* XXX */ 213 0, 0, 0, 0, ipip_sysctl 214 }, 215 #ifdef INET 216 { SOCK_RAW, &inet6domain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR, 217 ip4_input6, rip6_output, 0, rip6_ctloutput, 218 rip6_usrreq, /* XXX */ 219 0, 0, 0, 0, 220 }, 221 #endif /* INET */ 222 #endif /* GIF */ 223 #ifdef MROUTING 224 { SOCK_RAW, &inet6domain, IPPROTO_PIM, PR_ATOMIC|PR_ADDR, 225 pim6_input, rip6_output, 0, rip6_ctloutput, 226 rip6_usrreq, 227 0, 0, 0, 0, pim6_sysctl 228 }, 229 #endif 230 #if NCARP > 0 231 { SOCK_RAW, &inet6domain, IPPROTO_CARP, PR_ATOMIC|PR_ADDR, 232 carp6_proto_input, rip6_output, 0, rip6_ctloutput, 233 rip6_usrreq, 234 0, 0, 0, 0, carp_sysctl 235 }, 236 #endif /* NCARP */ 237 #if NPF > 0 238 { SOCK_RAW, &inet6domain, IPPROTO_DIVERT, PR_ATOMIC|PR_ADDR, 239 divert6_input, 0, 0, rip6_ctloutput, 240 divert6_usrreq, 241 divert6_init, 0, 0, 0, divert6_sysctl 242 }, 243 #endif /* NPF > 0 */ 244 /* raw wildcard */ 245 { SOCK_RAW, &inet6domain, 0, PR_ATOMIC|PR_ADDR, 246 rip6_input, rip6_output, 0, rip6_ctloutput, 247 rip6_usrreq, rip6_init, 248 0, 0, 0, 249 }, 250 }; 251 252 struct domain inet6domain = 253 { AF_INET6, "internet6", 0, 0, 0, 254 (struct protosw *)inet6sw, 255 (struct protosw *)&inet6sw[nitems(inet6sw)], 0, 256 #ifndef SMALL_KERNEL 257 rn_mpath_inithead, 258 #else 259 rn_inithead, 260 #endif 261 offsetof(struct sockaddr_in6, sin6_addr) << 3, 262 sizeof(struct sockaddr_in6), 263 in6_domifattach, in6_domifdetach, }; 264 265 /* 266 * Internet configuration info 267 */ 268 int ip6_forwarding = 0; /* no forwarding unless sysctl'd to enable */ 269 int ip6_mforwarding = 0; /* no multicast forwarding unless ... */ 270 int ip6_multipath = 0; /* no using multipath routes unless ... */ 271 int ip6_sendredirects = 1; 272 int ip6_defhlim = IPV6_DEFHLIM; 273 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 274 int ip6_accept_rtadv = 0; /* enabling forwarding and rtadv concurrently is dangerous */ 275 int ip6_maxfragpackets = 200; 276 int ip6_maxfrags = 200; 277 int ip6_log_interval = 5; 278 int ip6_hdrnestlimit = 10; /* appropriate? */ 279 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 280 int ip6_dad_pending; /* number of currently running DADs */ 281 int ip6_auto_flowlabel = 1; 282 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 283 int ip6_rr_prune = 5; /* router renumbering prefix 284 * walk list every 5 sec. */ 285 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 286 const int ip6_v6only = 1; 287 int ip6_neighborgcthresh = 2048; /* Threshold # of NDP entries for GC */ 288 int ip6_maxifprefixes = 16; /* Max acceptable prefixes via RA per IF */ 289 int ip6_maxifdefrouters = 16; /* Max acceptable def routers via RA */ 290 int ip6_maxdynroutes = 4096; /* Max # of routes created via redirect */ 291 int ip6_keepfaith = 0; 292 time_t ip6_log_time = (time_t)0L; 293 294 /* icmp6 */ 295 /* 296 * BSDI4 defines these variables in in_proto.c... 297 * XXX: what if we don't define INET? Should we define pmtu6_expire 298 * or so? (jinmei@kame.net 19990310) 299 */ 300 int pmtu_expire = 60*10; 301 302 /* raw IP6 parameters */ 303 /* 304 * Nominal space allocated to a raw ip socket. 305 */ 306 #define RIPV6SNDQ 8192 307 #define RIPV6RCVQ 8192 308 309 u_long rip6_sendspace = RIPV6SNDQ; 310 u_long rip6_recvspace = RIPV6RCVQ; 311 312 /* ICMPV6 parameters */ 313 int icmp6_rediraccept = 0; /* don't process redirects by default */ 314 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 315 int icmp6errppslim = 100; /* 100pps */ 316 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 317