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: releng/12.0/sys/netinet6/in6_rmx.c 336676 2018-07-24 16:35:52Z andrew $");
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 }
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