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_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $ 32 */ 33 34 /*- 35 * Copyright 1994, 1995 Massachusetts Institute of Technology 36 * 37 * Permission to use, copy, modify, and distribute this software and 38 * its documentation for any purpose and without fee is hereby 39 * granted, provided that both the above copyright notice and this 40 * permission notice appear in all copies, that both the above 41 * copyright notice and this permission notice appear in all 42 * supporting documentation, and that the name of M.I.T. not be used 43 * in advertising or publicity pertaining to distribution of the 44 * software without specific, written prior permission. M.I.T. makes 45 * no representations about the suitability of this software for any 46 * purpose. It is provided "as is" without express or implied 47 * warranty. 48 * 49 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 50 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 51 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 52 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 53 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 56 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 57 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 58 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 59 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 */ 63 64 #include <sys/cdefs.h> 65 __FBSDID("$FreeBSD$"); 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/kernel.h> 70 #include <sys/lock.h> 71 #include <sys/queue.h> 72 #include <sys/socket.h> 73 #include <sys/socketvar.h> 74 #include <sys/mbuf.h> 75 #include <sys/rwlock.h> 76 #include <sys/syslog.h> 77 #include <sys/callout.h> 78 79 #include <net/if.h> 80 #include <net/if_var.h> 81 #include <net/route.h> 82 #include <net/route_var.h> 83 84 #include <netinet/in.h> 85 #include <netinet/ip_var.h> 86 #include <netinet/in_var.h> 87 88 #include <netinet/ip6.h> 89 #include <netinet6/ip6_var.h> 90 91 #include <netinet/icmp6.h> 92 #include <netinet6/nd6.h> 93 94 #include <netinet/tcp.h> 95 #include <netinet/tcp_seq.h> 96 #include <netinet/tcp_timer.h> 97 #include <netinet/tcp_var.h> 98 99 extern int in6_inithead(void **head, int off); 100 #ifdef VIMAGE 101 extern int in6_detachhead(void **head, int off); 102 #endif 103 104 /* 105 * Do what we need to do when inserting a route. 106 */ 107 static struct radix_node * 108 in6_addroute(void *v_arg, void *n_arg, struct radix_head *head, 109 struct radix_node *treenodes) 110 { 111 struct rtentry *rt = (struct rtentry *)treenodes; 112 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt); 113 114 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 115 rt->rt_flags |= RTF_MULTICAST; 116 117 /* 118 * A little bit of help for both IPv6 output and input: 119 * For local addresses, we make sure that RTF_LOCAL is set, 120 * with the thought that this might one day be used to speed up 121 * ip_input(). 122 * 123 * We also mark routes to multicast addresses as such, because 124 * it's easy to do and might be useful (but this is much more 125 * dubious since it's so easy to inspect the address). (This 126 * is done above.) 127 * 128 * XXX 129 * should elaborate the code. 130 */ 131 if (rt->rt_flags & RTF_HOST) { 132 if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr) 133 ->sin6_addr, 134 &sin6->sin6_addr)) { 135 rt->rt_flags |= RTF_LOCAL; 136 } 137 } 138 139 if (rt->rt_ifp != NULL) { 140 141 /* 142 * Check route MTU: 143 * inherit interface MTU if not set or 144 * check if MTU is too large. 145 */ 146 if (rt->rt_mtu == 0) { 147 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp); 148 } else if (rt->rt_mtu > IN6_LINKMTU(rt->rt_ifp)) 149 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp); 150 } 151 152 return (rn_addroute(v_arg, n_arg, head, treenodes)); 153 } 154 155 /* 156 * Age old PMTUs. 157 */ 158 struct mtuex_arg { 159 struct rib_head *rnh; 160 time_t nextstop; 161 }; 162 VNET_DEFINE_STATIC(struct callout, rtq_mtutimer); 163 #define V_rtq_mtutimer VNET(rtq_mtutimer) 164 165 static int 166 in6_mtuexpire(struct rtentry *rt, void *rock) 167 { 168 struct mtuex_arg *ap = rock; 169 170 if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) { 171 if (rt->rt_expire <= time_uptime) { 172 rt->rt_flags |= RTF_PROBEMTU; 173 } else { 174 ap->nextstop = lmin(ap->nextstop, rt->rt_expire); 175 } 176 } 177 178 return (0); 179 } 180 181 #define MTUTIMO_DEFAULT (60*1) 182 183 static void 184 in6_mtutimo_setwa(struct rib_head *rnh, uint32_t fibum, int af, 185 void *_arg) 186 { 187 struct mtuex_arg *arg; 188 189 arg = (struct mtuex_arg *)_arg; 190 191 arg->rnh = rnh; 192 } 193 194 static void 195 in6_mtutimo(void *rock) 196 { 197 CURVNET_SET_QUIET((struct vnet *) rock); 198 struct timeval atv; 199 struct mtuex_arg arg; 200 201 rt_foreach_fib_walk(AF_INET6, in6_mtutimo_setwa, in6_mtuexpire, &arg); 202 203 atv.tv_sec = MTUTIMO_DEFAULT; 204 atv.tv_usec = 0; 205 callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock); 206 CURVNET_RESTORE(); 207 } 208 209 /* 210 * Initialize our routing tree. 211 */ 212 VNET_DEFINE_STATIC(int, _in6_rt_was_here); 213 #define V__in6_rt_was_here VNET(_in6_rt_was_here) 214 215 int 216 in6_inithead(void **head, int off) 217 { 218 struct rib_head *rh; 219 220 rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3); 221 if (rh == NULL) 222 return (0); 223 224 rh->rnh_addaddr = in6_addroute; 225 *head = (void *)rh; 226 227 if (V__in6_rt_was_here == 0) { 228 callout_init(&V_rtq_mtutimer, 1); 229 in6_mtutimo(curvnet); /* kick off timeout first time */ 230 V__in6_rt_was_here = 1; 231 } 232 233 return (1); 234 } 235 236 #ifdef VIMAGE 237 int 238 in6_detachhead(void **head, int off) 239 { 240 241 callout_drain(&V_rtq_mtutimer); 242 rt_table_destroy((struct rib_head *)(*head)); 243 244 return (1); 245 } 246 #endif 247 248 /* 249 * Extended API for IPv6 FIB support. 250 */ 251 void 252 in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm, 253 int flags, struct sockaddr *src, u_int fibnum) 254 { 255 256 rtredirect_fib(dst, gw, nm, flags, src, fibnum); 257 } 258 259 int 260 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw, 261 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum) 262 { 263 264 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum)); 265 } 266 267 void 268 in6_rtalloc(struct route_in6 *ro, u_int fibnum) 269 { 270 271 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum); 272 } 273 274 void 275 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum) 276 { 277 278 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum); 279 } 280 281 struct rtentry * 282 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum) 283 { 284 285 return (rtalloc1_fib(dst, report, ignflags, fibnum)); 286 } 287