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/route_ctl.h> 85 #include <net/route/route_var.h> 86 #include <net/route/nhop.h> 87 #include <net/route/shared.h> 88 89 #include <netinet/in.h> 90 #include <netinet/ip_var.h> 91 #include <netinet/in_var.h> 92 93 #include <netinet/ip6.h> 94 #include <netinet6/ip6_var.h> 95 96 #include <netinet/icmp6.h> 97 #include <netinet6/nd6.h> 98 99 #include <netinet/tcp.h> 100 #include <netinet/tcp_seq.h> 101 #include <netinet/tcp_timer.h> 102 #include <netinet/tcp_var.h> 103 104 static int 105 rib6_preadd(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask, 106 struct nhop_object *nh) 107 { 108 uint16_t nh_type; 109 110 /* XXX: RTF_LOCAL */ 111 112 /* 113 * Check route MTU: 114 * inherit interface MTU if not set or 115 * check if MTU is too large. 116 */ 117 if (nh->nh_mtu == 0) { 118 nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp); 119 } else if (nh->nh_mtu > IN6_LINKMTU(nh->nh_ifp)) 120 nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp); 121 122 /* Ensure that default route nhop has special flag */ 123 const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *)mask; 124 if ((nhop_get_rtflags(nh) & RTF_HOST) == 0 && mask6 != NULL && 125 IN6_IS_ADDR_UNSPECIFIED(&mask6->sin6_addr)) 126 nh->nh_flags |= NHF_DEFAULT; 127 128 /* Set nexthop type */ 129 if (nhop_get_type(nh) == 0) { 130 if (nh->nh_flags & NHF_GATEWAY) 131 nh_type = NH_TYPE_IPV6_ETHER_NHOP; 132 else 133 nh_type = NH_TYPE_IPV6_ETHER_RSLV; 134 135 nhop_set_type(nh, nh_type); 136 } 137 138 return (0); 139 } 140 141 /* 142 * Initialize our routing tree. 143 */ 144 145 struct rib_head * 146 in6_inithead(uint32_t fibnum) 147 { 148 struct rib_head *rh; 149 struct rib_subscription *rs; 150 151 rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3, 152 AF_INET6, fibnum); 153 if (rh == NULL) 154 return (NULL); 155 156 rh->rnh_preadd = rib6_preadd; 157 #ifdef RADIX_MPATH 158 rt_mpath_init_rnh(rh); 159 #endif 160 161 rs = rib_subscribe_internal(rh, nd6_subscription_cb, NULL, 162 RIB_NOTIFY_IMMEDIATE, true); 163 KASSERT(rs != NULL, ("Unable to subscribe to fib %u\n", fibnum)); 164 165 return (rh); 166 } 167 168 #ifdef VIMAGE 169 void 170 in6_detachhead(struct rib_head *rh) 171 { 172 173 rt_table_destroy(rh); 174 } 175 #endif 176 177