summaryrefslogtreecommitdiffstats
path: root/freebsd/sys/netinet6/in6_rmx.c
blob: 4c59a1ade3ed2ed996cf51ed6b9530029322ecc3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
#include <machine/rtems-bsd-kernel-space.h>

/*-
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
 */

/*-
 * Copyright 1994, 1995 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that both the above copyright notice and this
 * permission notice appear in all copies, that both the above
 * copyright notice and this permission notice appear in all
 * supporting documentation, and that the name of M.I.T. not be used
 * in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  M.I.T. makes
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 *
 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <rtems/bsd/sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <rtems/bsd/sys/lock.h>
#include <sys/sysctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/rwlock.h>
#include <sys/syslog.h>
#include <sys/callout.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>

#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>

#include <netinet/icmp6.h>
#include <netinet6/nd6.h>

#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>

extern int	in6_inithead(void **head, int off);
#ifdef VIMAGE
extern int	in6_detachhead(void **head, int off);
#endif

/*
 * Do what we need to do when inserting a route.
 */
static struct radix_node *
in6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
    struct radix_node *treenodes)
{
	struct rtentry *rt = (struct rtentry *)treenodes;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
	struct radix_node *ret;

	RADIX_NODE_HEAD_WLOCK_ASSERT(head);
	if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
		rt->rt_flags |= RTF_MULTICAST;

	/*
	 * A little bit of help for both IPv6 output and input:
	 *   For local addresses, we make sure that RTF_LOCAL is set,
	 *   with the thought that this might one day be used to speed up
	 *   ip_input().
	 *
	 * We also mark routes to multicast addresses as such, because
	 * it's easy to do and might be useful (but this is much more
	 * dubious since it's so easy to inspect the address).  (This
	 * is done above.)
	 *
	 * XXX
	 * should elaborate the code.
	 */
	if (rt->rt_flags & RTF_HOST) {
		if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
					->sin6_addr,
				       &sin6->sin6_addr)) {
			rt->rt_flags |= RTF_LOCAL;
		}
	}

	if (!rt->rt_rmx.rmx_mtu && rt->rt_ifp)
		rt->rt_rmx.rmx_mtu = IN6_LINKMTU(rt->rt_ifp);

	ret = rn_addroute(v_arg, n_arg, head, treenodes);
	if (ret == NULL) {
		struct rtentry *rt2;
		/*
		 * We are trying to add a net route, but can't.
		 * The following case should be allowed, so we'll make a
		 * special check for this:
		 *	Two IPv6 addresses with the same prefix is assigned
		 *	to a single interrface.
		 *	# ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1)
		 *	# ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2)
		 *	In this case, (*1) and (*2) want to add the same
		 *	net route entry, 3ffe:0501:: -> if0.
		 *	This case should not raise an error.
		 */
		rt2 = in6_rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED,
		    rt->rt_fibnum);
		if (rt2) {
			if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0)
			 && rt2->rt_gateway
			 && rt2->rt_gateway->sa_family == AF_LINK
			 && rt2->rt_ifp == rt->rt_ifp) {
				ret = rt2->rt_nodes;
			}
			RTFREE_LOCKED(rt2);
		}
	}
	return (ret);
}

SYSCTL_DECL(_net_inet6_ip6);

static VNET_DEFINE(int, rtq_toomany6) = 128;
	/* 128 cached routes is ``too many'' */
#define	V_rtq_toomany6			VNET(rtq_toomany6)
SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW,
    &VNET_NAME(rtq_toomany6) , 0, "");

struct rtqk_arg {
	struct radix_node_head *rnh;
	int mode;
	int updating;
	int draining;
	int killed;
	int found;
	time_t nextstop;
};

/*
 * Age old PMTUs.
 */
struct mtuex_arg {
	struct radix_node_head *rnh;
	time_t nextstop;
};
static VNET_DEFINE(struct callout, rtq_mtutimer);
#define	V_rtq_mtutimer			VNET(rtq_mtutimer)

static int
in6_mtuexpire(struct radix_node *rn, void *rock)
{
	struct rtentry *rt = (struct rtentry *)rn;
	struct mtuex_arg *ap = rock;

	/* sanity */
	if (!rt)
		panic("rt == NULL in in6_mtuexpire");

	if (rt->rt_rmx.rmx_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
		if (rt->rt_rmx.rmx_expire <= time_uptime) {
			rt->rt_flags |= RTF_PROBEMTU;
		} else {
			ap->nextstop = lmin(ap->nextstop,
					rt->rt_rmx.rmx_expire);
		}
	}

	return 0;
}

#define	MTUTIMO_DEFAULT	(60*1)

static void
in6_mtutimo_one(struct radix_node_head *rnh)
{
	struct mtuex_arg arg;

	arg.rnh = rnh;
	arg.nextstop = time_uptime + MTUTIMO_DEFAULT;
	RADIX_NODE_HEAD_LOCK(rnh);
	rnh->rnh_walktree(rnh, in6_mtuexpire, &arg);
	RADIX_NODE_HEAD_UNLOCK(rnh);
}

static void
in6_mtutimo(void *rock)
{
	CURVNET_SET_QUIET((struct vnet *) rock);
	struct radix_node_head *rnh;
	struct timeval atv;
	u_int fibnum;

	for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
		rnh = rt_tables_get_rnh(fibnum, AF_INET6);
		if (rnh != NULL)
			in6_mtutimo_one(rnh);
	}

	atv.tv_sec = MTUTIMO_DEFAULT;
	atv.tv_usec = 0;
	callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
	CURVNET_RESTORE();
}

/*
 * Initialize our routing tree.
 * XXX MRT When off == 0, we are being called from vfs_export.c
 * so just set up their table and leave. (we know what the correct
 * value should be so just use that).. FIX AFTER RELENG_7 is MFC'd
 * see also comments in in_inithead() vfs_export.c and domain.h
 */
static VNET_DEFINE(int, _in6_rt_was_here);
#define	V__in6_rt_was_here	VNET(_in6_rt_was_here)

int
in6_inithead(void **head, int off)
{
	struct radix_node_head *rnh;

	if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3))
		return 0;		/* See above */

	if (off == 0)		/* See above */
		return 1;	/* only do the rest for the real thing */

	rnh = *head;
	rnh->rnh_addaddr = in6_addroute;

	if (V__in6_rt_was_here == 0) {
		callout_init(&V_rtq_mtutimer, CALLOUT_MPSAFE);
		in6_mtutimo(curvnet);	/* kick off timeout first time */
		V__in6_rt_was_here = 1;
	}

	return 1;
}

#ifdef VIMAGE
int
in6_detachhead(void **head, int off)
{

	callout_drain(&V_rtq_mtutimer);
	return (1);
}
#endif

/*
 * Extended API for IPv6 FIB support.
 */
void
in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
    int flags, struct sockaddr *src, u_int fibnum)
{

	rtredirect_fib(dst, gw, nm, flags, src, fibnum);
}

int
in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
    struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
{

	return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
}

void
in6_rtalloc(struct route_in6 *ro, u_int fibnum)
{

	rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
}

void
in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
{

	rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
}

struct rtentry *
in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
{

	return (rtalloc1_fib(dst, report, ignflags, fibnum));
}