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 "opt_mpath.h" 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/kernel.h> 72 #include <sys/lock.h> 73 #include <sys/queue.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/mbuf.h> 77 #include <sys/rwlock.h> 78 #include <sys/syslog.h> 79 #include <sys/callout.h> 80 81 #include <net/if.h> 82 #include <net/if_var.h> 83 #include <net/route.h> 84 #include <net/route_var.h> 85 #include <net/route/nhop.h> 86 #include <net/route/shared.h> 87 88 #include <netinet/in.h> 89 #include <netinet/ip_var.h> 90 #include <netinet/in_var.h> 91 92 #include <netinet/ip6.h> 93 #include <netinet6/ip6_var.h> 94 95 #include <netinet/icmp6.h> 96 #include <netinet6/nd6.h> 97 98 #include <netinet/tcp.h> 99 #include <netinet/tcp_seq.h> 100 #include <netinet/tcp_timer.h> 101 #include <netinet/tcp_var.h> 102 103 extern int in6_inithead(void **head, int off, u_int fibnum); 104 #ifdef VIMAGE 105 extern int in6_detachhead(void **head, int off); 106 #endif 107 108 static int 109 rib6_preadd(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask, 110 struct nhop_object *nh) 111 { 112 uint16_t nh_type; 113 114 /* XXX: RTF_LOCAL */ 115 116 /* 117 * Check route MTU: 118 * inherit interface MTU if not set or 119 * check if MTU is too large. 120 */ 121 if (nh->nh_mtu == 0) { 122 nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp); 123 } else if (nh->nh_mtu > IN6_LINKMTU(nh->nh_ifp)) 124 nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp); 125 126 /* Ensure that default route nhop has special flag */ 127 const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *)mask; 128 if ((nhop_get_rtflags(nh) & RTF_HOST) == 0 && mask6 != NULL && 129 IN6_IS_ADDR_UNSPECIFIED(&mask6->sin6_addr)) 130 nh->nh_flags |= NHF_DEFAULT; 131 132 /* Set nexthop type */ 133 if (nhop_get_type(nh) == 0) { 134 if (nh->nh_flags & NHF_GATEWAY) 135 nh_type = NH_TYPE_IPV6_ETHER_NHOP; 136 else 137 nh_type = NH_TYPE_IPV6_ETHER_RSLV; 138 139 nhop_set_type(nh, nh_type); 140 } 141 142 return (0); 143 } 144 145 /* 146 * Do what we need to do when inserting a route. 147 */ 148 static struct radix_node * 149 in6_addroute(void *v_arg, void *n_arg, struct radix_head *head, 150 struct radix_node *treenodes) 151 { 152 struct rtentry *rt = (struct rtentry *)treenodes; 153 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt); 154 155 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 156 rt->rt_flags |= RTF_MULTICAST; 157 158 /* 159 * A little bit of help for both IPv6 output and input: 160 * For local addresses, we make sure that RTF_LOCAL is set, 161 * with the thought that this might one day be used to speed up 162 * ip_input(). 163 * 164 * We also mark routes to multicast addresses as such, because 165 * it's easy to do and might be useful (but this is much more 166 * dubious since it's so easy to inspect the address). (This 167 * is done above.) 168 * 169 * XXX 170 * should elaborate the code. 171 */ 172 if (rt->rt_flags & RTF_HOST) { 173 if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr) 174 ->sin6_addr, 175 &sin6->sin6_addr)) { 176 rt->rt_flags |= RTF_LOCAL; 177 } 178 } 179 180 if (rt->rt_ifp != NULL) { 181 182 /* 183 * Check route MTU: 184 * inherit interface MTU if not set or 185 * check if MTU is too large. 186 */ 187 if (rt->rt_mtu == 0) { 188 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp); 189 } else if (rt->rt_mtu > IN6_LINKMTU(rt->rt_ifp)) 190 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp); 191 } 192 193 return (rn_addroute(v_arg, n_arg, head, treenodes)); 194 } 195 196 /* 197 * Initialize our routing tree. 198 */ 199 200 int 201 in6_inithead(void **head, int off, u_int fibnum) 202 { 203 struct rib_head *rh; 204 205 rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3, 206 AF_INET6, fibnum); 207 if (rh == NULL) 208 return (0); 209 210 rh->rnh_addaddr = in6_addroute; 211 rh->rnh_preadd = rib6_preadd; 212 #ifdef RADIX_MPATH 213 rt_mpath_init_rnh(rh); 214 #endif 215 *head = (void *)rh; 216 217 return (1); 218 } 219 220 #ifdef VIMAGE 221 int 222 in6_detachhead(void **head, int off) 223 { 224 225 rt_table_destroy((struct rib_head *)(*head)); 226 227 return (1); 228 } 229 #endif 230 231 /* 232 * Extended API for IPv6 FIB support. 233 */ 234 int 235 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw, 236 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum) 237 { 238 239 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum)); 240 } 241 242 void 243 in6_rtalloc(struct route_in6 *ro, u_int fibnum) 244 { 245 246 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum); 247 } 248 249 void 250 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum) 251 { 252 253 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum); 254 } 255 256 struct rtentry * 257 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum) 258 { 259 260 return (rtalloc1_fib(dst, report, ignflags, fibnum)); 261 } 262