in6_rmx.c revision 274118
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $ 30 */ 31 32/*- 33 * Copyright 1994, 1995 Massachusetts Institute of Technology 34 * 35 * Permission to use, copy, modify, and distribute this software and 36 * its documentation for any purpose and without fee is hereby 37 * granted, provided that both the above copyright notice and this 38 * permission notice appear in all copies, that both the above 39 * copyright notice and this permission notice appear in all 40 * supporting documentation, and that the name of M.I.T. not be used 41 * in advertising or publicity pertaining to distribution of the 42 * software without specific, written prior permission. M.I.T. makes 43 * no representations about the suitability of this software for any 44 * purpose. It is provided "as is" without express or implied 45 * warranty. 46 * 47 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 48 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 49 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 50 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 51 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 53 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 54 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 55 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 56 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 57 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 */ 61 62#include <sys/cdefs.h> 63__FBSDID("$FreeBSD: head/sys/netinet6/in6_rmx.c 274118 2014-11-05 00:58:01Z melifaro $"); 64 65#include <sys/param.h> 66#include <sys/systm.h> 67#include <sys/kernel.h> 68#include <sys/lock.h> 69#include <sys/sysctl.h> 70#include <sys/queue.h> 71#include <sys/socket.h> 72#include <sys/socketvar.h> 73#include <sys/mbuf.h> 74#include <sys/rwlock.h> 75#include <sys/syslog.h> 76#include <sys/callout.h> 77 78#include <net/if.h> 79#include <net/if_var.h> 80#include <net/route.h> 81 82#include <netinet/in.h> 83#include <netinet/ip_var.h> 84#include <netinet/in_var.h> 85 86#include <netinet/ip6.h> 87#include <netinet6/ip6_var.h> 88 89#include <netinet/icmp6.h> 90#include <netinet6/nd6.h> 91 92#include <netinet/tcp.h> 93#include <netinet/tcp_seq.h> 94#include <netinet/tcp_timer.h> 95#include <netinet/tcp_var.h> 96 97extern int in6_inithead(void **head, int off); 98#ifdef VIMAGE 99extern int in6_detachhead(void **head, int off); 100#endif 101 102/* 103 * Do what we need to do when inserting a route. 104 */ 105static struct radix_node * 106in6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head, 107 struct radix_node *treenodes) 108{ 109 struct rtentry *rt = (struct rtentry *)treenodes; 110 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt); 111 struct radix_node *ret; 112 113 RADIX_NODE_HEAD_WLOCK_ASSERT(head); 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_mtu && rt->rt_ifp) 140 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp); 141 142 ret = rn_addroute(v_arg, n_arg, head, treenodes); 143 if (ret == NULL) { 144 struct rtentry *rt2; 145 /* 146 * We are trying to add a net route, but can't. 147 * The following case should be allowed, so we'll make a 148 * special check for this: 149 * Two IPv6 addresses with the same prefix is assigned 150 * to a single interrface. 151 * # ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1) 152 * # ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2) 153 * In this case, (*1) and (*2) want to add the same 154 * net route entry, 3ffe:0501:: -> if0. 155 * This case should not raise an error. 156 */ 157 rt2 = in6_rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED, 158 rt->rt_fibnum); 159 if (rt2) { 160 if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0) 161 && rt2->rt_gateway 162 && rt2->rt_gateway->sa_family == AF_LINK 163 && rt2->rt_ifp == rt->rt_ifp) { 164 ret = rt2->rt_nodes; 165 } 166 RTFREE_LOCKED(rt2); 167 } 168 } 169 return (ret); 170} 171 172SYSCTL_DECL(_net_inet6_ip6); 173 174static VNET_DEFINE(int, rtq_toomany6) = 128; 175 /* 128 cached routes is ``too many'' */ 176#define V_rtq_toomany6 VNET(rtq_toomany6) 177SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW, 178 &VNET_NAME(rtq_toomany6) , 0, ""); 179 180struct rtqk_arg { 181 struct radix_node_head *rnh; 182 int mode; 183 int updating; 184 int draining; 185 int killed; 186 int found; 187 time_t nextstop; 188}; 189 190/* 191 * Age old PMTUs. 192 */ 193struct mtuex_arg { 194 struct radix_node_head *rnh; 195 time_t nextstop; 196}; 197static VNET_DEFINE(struct callout, rtq_mtutimer); 198#define V_rtq_mtutimer VNET(rtq_mtutimer) 199 200static int 201in6_mtuexpire(struct radix_node *rn, void *rock) 202{ 203 struct rtentry *rt = (struct rtentry *)rn; 204 struct mtuex_arg *ap = rock; 205 206 /* sanity */ 207 if (!rt) 208 panic("rt == NULL in in6_mtuexpire"); 209 210 if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) { 211 if (rt->rt_expire <= time_uptime) { 212 rt->rt_flags |= RTF_PROBEMTU; 213 } else { 214 ap->nextstop = lmin(ap->nextstop, rt->rt_expire); 215 } 216 } 217 218 return 0; 219} 220 221#define MTUTIMO_DEFAULT (60*1) 222 223static void 224in6_mtutimo_one(struct radix_node_head *rnh) 225{ 226 struct mtuex_arg arg; 227 228 arg.rnh = rnh; 229 arg.nextstop = time_uptime + MTUTIMO_DEFAULT; 230 RADIX_NODE_HEAD_LOCK(rnh); 231 rnh->rnh_walktree(rnh, in6_mtuexpire, &arg); 232 RADIX_NODE_HEAD_UNLOCK(rnh); 233} 234 235static void 236in6_mtutimo(void *rock) 237{ 238 CURVNET_SET_QUIET((struct vnet *) rock); 239 struct radix_node_head *rnh; 240 struct timeval atv; 241 u_int fibnum; 242 243 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 244 rnh = rt_tables_get_rnh(fibnum, AF_INET6); 245 if (rnh != NULL) 246 in6_mtutimo_one(rnh); 247 } 248 249 atv.tv_sec = MTUTIMO_DEFAULT; 250 atv.tv_usec = 0; 251 callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock); 252 CURVNET_RESTORE(); 253} 254 255/* 256 * Initialize our routing tree. 257 */ 258static VNET_DEFINE(int, _in6_rt_was_here); 259#define V__in6_rt_was_here VNET(_in6_rt_was_here) 260 261int 262in6_inithead(void **head, int off) 263{ 264 struct radix_node_head *rnh; 265 266 if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3)) 267 return (0); 268 269 rnh = *head; 270 RADIX_NODE_HEAD_LOCK_INIT(rnh); 271 272 rnh->rnh_addaddr = in6_addroute; 273 274 if (V__in6_rt_was_here == 0) { 275 callout_init(&V_rtq_mtutimer, CALLOUT_MPSAFE); 276 in6_mtutimo(curvnet); /* kick off timeout first time */ 277 V__in6_rt_was_here = 1; 278 } 279 280 return (1); 281} 282 283#ifdef VIMAGE 284int 285in6_detachhead(void **head, int off) 286{ 287 288 callout_drain(&V_rtq_mtutimer); 289 return (1); 290} 291#endif 292 293/* 294 * Extended API for IPv6 FIB support. 295 */ 296void 297in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm, 298 int flags, struct sockaddr *src, u_int fibnum) 299{ 300 301 rtredirect_fib(dst, gw, nm, flags, src, fibnum); 302} 303 304int 305in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw, 306 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum) 307{ 308 309 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum)); 310} 311 312void 313in6_rtalloc(struct route_in6 *ro, u_int fibnum) 314{ 315 316 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum); 317} 318 319void 320in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum) 321{ 322 323 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum); 324} 325 326struct rtentry * 327in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum) 328{ 329 330 return (rtalloc1_fib(dst, report, ignflags, fibnum)); 331} 332