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: releng/10.2/sys/netinet6/in6_rmx.c 263478 2014-03-21 15:15:30Z glebius $");
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/route.h>
80
81 #include <netinet/in.h>
82 #include <netinet/ip_var.h>
83 #include <netinet/in_var.h>
84
85 #include <netinet/ip6.h>
86 #include <netinet6/ip6_var.h>
87
88 #include <netinet/icmp6.h>
89 #include <netinet6/nd6.h>
90
91 #include <netinet/tcp.h>
92 #include <netinet/tcp_seq.h>
93 #include <netinet/tcp_timer.h>
94 #include <netinet/tcp_var.h>
95
96 extern int in6_inithead(void **head, int off);
97 #ifdef VIMAGE
98 extern int in6_detachhead(void **head, int off);
99 #endif
100
101 /*
102 * Do what we need to do when inserting a route.
103 */
104 static struct radix_node *
105 in6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
106 struct radix_node *treenodes)
107 {
108 struct rtentry *rt = (struct rtentry *)treenodes;
109 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
110 struct radix_node *ret;
111
112 RADIX_NODE_HEAD_WLOCK_ASSERT(head);
113 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
114 rt->rt_flags |= RTF_MULTICAST;
115
116 /*
117 * A little bit of help for both IPv6 output and input:
118 * For local addresses, we make sure that RTF_LOCAL is set,
119 * with the thought that this might one day be used to speed up
120 * ip_input().
121 *
122 * We also mark routes to multicast addresses as such, because
123 * it's easy to do and might be useful (but this is much more
124 * dubious since it's so easy to inspect the address). (This
125 * is done above.)
126 *
127 * XXX
128 * should elaborate the code.
129 */
130 if (rt->rt_flags & RTF_HOST) {
131 if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
132 ->sin6_addr,
133 &sin6->sin6_addr)) {
134 rt->rt_flags |= RTF_LOCAL;
135 }
136 }
137
138 if (!rt->rt_mtu && rt->rt_ifp)
139 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
140
141 ret = rn_addroute(v_arg, n_arg, head, treenodes);
142 if (ret == NULL) {
143 struct rtentry *rt2;
144 /*
145 * We are trying to add a net route, but can't.
146 * The following case should be allowed, so we'll make a
147 * special check for this:
148 * Two IPv6 addresses with the same prefix is assigned
149 * to a single interrface.
150 * # ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1)
151 * # ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2)
152 * In this case, (*1) and (*2) want to add the same
153 * net route entry, 3ffe:0501:: -> if0.
154 * This case should not raise an error.
155 */
156 rt2 = in6_rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED,
157 rt->rt_fibnum);
158 if (rt2) {
159 if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0)
160 && rt2->rt_gateway
161 && rt2->rt_gateway->sa_family == AF_LINK
162 && rt2->rt_ifp == rt->rt_ifp) {
163 ret = rt2->rt_nodes;
164 }
165 RTFREE_LOCKED(rt2);
166 }
167 }
168 return (ret);
169 }
170
171 SYSCTL_DECL(_net_inet6_ip6);
172
173 static VNET_DEFINE(int, rtq_toomany6) = 128;
174 /* 128 cached routes is ``too many'' */
175 #define V_rtq_toomany6 VNET(rtq_toomany6)
176 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW,
177 &VNET_NAME(rtq_toomany6) , 0, "");
178
179 struct rtqk_arg {
180 struct radix_node_head *rnh;
181 int mode;
182 int updating;
183 int draining;
184 int killed;
185 int found;
186 time_t nextstop;
187 };
188
189 /*
190 * Age old PMTUs.
191 */
192 struct mtuex_arg {
193 struct radix_node_head *rnh;
194 time_t nextstop;
195 };
196 static VNET_DEFINE(struct callout, rtq_mtutimer);
197 #define V_rtq_mtutimer VNET(rtq_mtutimer)
198
199 static int
200 in6_mtuexpire(struct radix_node *rn, void *rock)
201 {
202 struct rtentry *rt = (struct rtentry *)rn;
203 struct mtuex_arg *ap = rock;
204
205 /* sanity */
206 if (!rt)
207 panic("rt == NULL in in6_mtuexpire");
208
209 if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
210 if (rt->rt_expire <= time_uptime) {
211 rt->rt_flags |= RTF_PROBEMTU;
212 } else {
213 ap->nextstop = lmin(ap->nextstop, rt->rt_expire);
214 }
215 }
216
217 return 0;
218 }
219
220 #define MTUTIMO_DEFAULT (60*1)
221
222 static void
223 in6_mtutimo_one(struct radix_node_head *rnh)
224 {
225 struct mtuex_arg arg;
226
227 arg.rnh = rnh;
228 arg.nextstop = time_uptime + MTUTIMO_DEFAULT;
229 RADIX_NODE_HEAD_LOCK(rnh);
230 rnh->rnh_walktree(rnh, in6_mtuexpire, &arg);
231 RADIX_NODE_HEAD_UNLOCK(rnh);
232 }
233
234 static void
235 in6_mtutimo(void *rock)
236 {
237 CURVNET_SET_QUIET((struct vnet *) rock);
238 struct radix_node_head *rnh;
239 struct timeval atv;
240 u_int fibnum;
241
242 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
243 rnh = rt_tables_get_rnh(fibnum, AF_INET6);
244 if (rnh != NULL)
245 in6_mtutimo_one(rnh);
246 }
247
248 atv.tv_sec = MTUTIMO_DEFAULT;
249 atv.tv_usec = 0;
250 callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
251 CURVNET_RESTORE();
252 }
253
254 /*
255 * Initialize our routing tree.
256 * XXX MRT When off == 0, we are being called from vfs_export.c
257 * so just set up their table and leave. (we know what the correct
258 * value should be so just use that).. FIX AFTER RELENG_7 is MFC'd
259 * see also comments in in_inithead() vfs_export.c and domain.h
260 */
261 static VNET_DEFINE(int, _in6_rt_was_here);
262 #define V__in6_rt_was_here VNET(_in6_rt_was_here)
263
264 int
265 in6_inithead(void **head, int off)
266 {
267 struct radix_node_head *rnh;
268
269 if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3))
270 return 0; /* See above */
271
272 if (off == 0) /* See above */
273 return 1; /* only do the rest for the real thing */
274
275 rnh = *head;
276 rnh->rnh_addaddr = in6_addroute;
277
278 if (V__in6_rt_was_here == 0) {
279 callout_init(&V_rtq_mtutimer, CALLOUT_MPSAFE);
280 in6_mtutimo(curvnet); /* kick off timeout first time */
281 V__in6_rt_was_here = 1;
282 }
283
284 return 1;
285 }
286
287 #ifdef VIMAGE
288 int
289 in6_detachhead(void **head, int off)
290 {
291
292 callout_drain(&V_rtq_mtutimer);
293 return (1);
294 }
295 #endif
296
297 /*
298 * Extended API for IPv6 FIB support.
299 */
300 void
301 in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
302 int flags, struct sockaddr *src, u_int fibnum)
303 {
304
305 rtredirect_fib(dst, gw, nm, flags, src, fibnum);
306 }
307
308 int
309 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
310 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
311 {
312
313 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
314 }
315
316 void
317 in6_rtalloc(struct route_in6 *ro, u_int fibnum)
318 {
319
320 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
321 }
322
323 void
324 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
325 {
326
327 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
328 }
329
330 struct rtentry *
331 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
332 {
333
334 return (rtalloc1_fib(dst, report, ignflags, fibnum));
335 }
Cache object: dd21af16dd3fdbfe57909197271de27b
|