1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1991, 1993 5 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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 32 #include "opt_route.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/socket.h> 38 #include <sys/sysctl.h> 39 #include <sys/syslog.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/rmlock.h> 43 44 #include <net/if.h> 45 #include <net/if_var.h> 46 #include <net/if_private.h> 47 #include <net/if_dl.h> 48 #include <net/route.h> 49 #include <net/route/route_ctl.h> 50 #include <net/route/route_var.h> 51 #include <net/route/nhop.h> 52 #include <net/vnet.h> 53 54 #include <netinet/in.h> 55 56 /* 57 * Control interface address fib propagation. 58 * By default, interface address routes are added to the fib of the interface. 59 * Once set to non-zero, adds interface address route to all fibs. 60 */ 61 VNET_DEFINE(u_int, rt_add_addr_allfibs) = 0; 62 SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET, 63 &VNET_NAME(rt_add_addr_allfibs), 0, ""); 64 65 /* 66 * Executes routing tables change specified by @cmd and @info for the fib 67 * @fibnum. Generates routing message on success. 68 * Note: it assumes there is only single route (interface route) for the 69 * provided prefix. 70 * Returns 0 on success or errno. 71 */ 72 static int 73 rib_handle_ifaddr_one(uint32_t fibnum, int cmd, struct rt_addrinfo *info) 74 { 75 struct rib_cmd_info rc; 76 struct nhop_object *nh; 77 int error; 78 79 error = rib_action(fibnum, cmd, info, &rc); 80 if (error == 0) { 81 if (cmd == RTM_ADD) 82 nh = nhop_select(rc.rc_nh_new, 0); 83 else 84 nh = nhop_select(rc.rc_nh_old, 0); 85 rt_routemsg(cmd, rc.rc_rt, nh, fibnum); 86 } 87 88 return (error); 89 } 90 91 /* 92 * Adds/deletes interface prefix specified by @info to the routing table. 93 * If V_rt_add_addr_allfibs is set, iterates over all existing routing 94 * tables, otherwise uses fib in @fibnum. Generates routing message for 95 * each table. 96 * Returns 0 on success or errno. 97 */ 98 int 99 rib_handle_ifaddr_info(uint32_t fibnum, int cmd, struct rt_addrinfo *info) 100 { 101 int error = 0, last_error = 0; 102 bool didwork = false; 103 104 if (V_rt_add_addr_allfibs == 0) { 105 error = rib_handle_ifaddr_one(fibnum, cmd, info); 106 didwork = (error == 0); 107 } else { 108 for (fibnum = 0; fibnum < V_rt_numfibs; fibnum++) { 109 error = rib_handle_ifaddr_one(fibnum, cmd, info); 110 if (error == 0) 111 didwork = true; 112 else 113 last_error = error; 114 } 115 } 116 117 if (cmd == RTM_DELETE) { 118 if (didwork) { 119 error = 0; 120 } else { 121 /* we only give an error if it wasn't in any table */ 122 error = ((info->rti_flags & RTF_HOST) ? 123 EHOSTUNREACH : ENETUNREACH); 124 } 125 } else { 126 if (last_error != 0) { 127 /* return an error if any of them failed */ 128 error = last_error; 129 } 130 } 131 return (error); 132 } 133 134 static int 135 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 136 struct sockaddr *ia) 137 { 138 struct rib_cmd_info rc; 139 struct epoch_tracker et; 140 int error; 141 struct rt_addrinfo info; 142 struct sockaddr_dl null_sdl; 143 struct ifnet *ifp; 144 145 ifp = ifa->ifa_ifp; 146 147 NET_EPOCH_ENTER(et); 148 bzero(&info, sizeof(info)); 149 if (cmd != RTM_DELETE) 150 info.rti_ifp = V_loif; 151 if (cmd == RTM_ADD) { 152 /* explicitly specify (loopback) ifa */ 153 if (info.rti_ifp != NULL) 154 info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 155 } 156 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 157 info.rti_info[RTAX_DST] = ia; 158 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 159 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 160 161 error = rib_action(ifp->if_fib, cmd, &info, &rc); 162 NET_EPOCH_EXIT(et); 163 164 if (error == 0 || 165 (cmd == RTM_ADD && error == EEXIST) || 166 (cmd == RTM_DELETE && (error == ENOENT || error == ESRCH))) 167 return (error); 168 169 log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n", 170 __func__, otype, if_name(ifp), error); 171 172 return (error); 173 } 174 175 int 176 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 177 { 178 179 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 180 } 181 182 int 183 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 184 { 185 186 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 187 } 188 189 int 190 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 191 { 192 193 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 194 } 195 196 static bool 197 match_kernel_route(const struct rtentry *rt, struct nhop_object *nh) 198 { 199 if (!NH_IS_NHGRP(nh) && (nhop_get_rtflags(nh) & RTF_PINNED) && 200 nh->nh_aifp->if_fib == nhop_get_fibnum(nh)) 201 return (true); 202 return (false); 203 } 204 205 static int 206 pick_kernel_route(struct rtentry *rt, void *arg) 207 { 208 struct nhop_object *nh = rt->rt_nhop; 209 struct rib_head *rh_dst = (struct rib_head *)arg; 210 211 if (match_kernel_route(rt, nh)) { 212 struct rib_cmd_info rc = {}; 213 struct route_nhop_data rnd = { 214 .rnd_nhop = nh, 215 .rnd_weight = rt->rt_weight, 216 }; 217 rib_copy_route(rt, &rnd, rh_dst, &rc); 218 } 219 return (0); 220 } 221 222 /* 223 * Tries to copy kernel routes matching pattern from @rh_src to @rh_dst. 224 * 225 * Note: as this function acquires locks for both @rh_src and @rh_dst, 226 * it needs to be called under RTABLES_LOCK() to avoid deadlocking 227 * with multiple ribs. 228 */ 229 void 230 rib_copy_kernel_routes(struct rib_head *rh_src, struct rib_head *rh_dst) 231 { 232 struct epoch_tracker et; 233 234 if (V_rt_add_addr_allfibs == 0) 235 return; 236 237 NET_EPOCH_ENTER(et); 238 rib_walk_ext_internal(rh_src, false, pick_kernel_route, NULL, rh_dst); 239 NET_EPOCH_EXIT(et); 240 } 241 242