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
|
/*-
* Copyright (c) 1999 Poul-Henning Kamp.
* Copyright (c) 2008 Bjoern A. Zeeb.
* Copyright (c) 2009 James Gritton.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/sysproto.h>
#include <sys/malloc.h>
#include <sys/osd.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/taskqueue.h>
#include <sys/fcntl.h>
#include <sys/jail.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/racct.h>
#include <sys/refcount.h>
#include <sys/sx.h>
#include <sys/sysent.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/vnet.h>
#include <netinet/in.h>
static void
prison_bcopy_primary_ip6(const struct prison *pr, struct in6_addr *ia6)
{
bcopy(prison_ip_get0(pr, PR_INET6), ia6, sizeof(struct in6_addr));
}
int
prison_qcmp_v6(const void *ip1, const void *ip2)
{
const struct in6_addr *ia6a, *ia6b;
int i, rc;
ia6a = (const struct in6_addr *)ip1;
ia6b = (const struct in6_addr *)ip2;
rc = 0;
for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
rc = 1;
else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
rc = -1;
}
return (rc);
}
bool
prison_valid_v6(const void *ip)
{
const struct in6_addr *ia = ip;
return (!IN6_IS_ADDR_UNSPECIFIED(ia));
}
/*
* Pass back primary IPv6 address for this jail.
*
* If not restricted return success but do not alter the address. Caller has
* to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
*
* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
*/
int
prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
{
struct prison *pr;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
pr = cred->cr_prison;
if (!(pr->pr_flags & PR_IP6))
return (0);
mtx_lock(&pr->pr_mtx);
if (!(pr->pr_flags & PR_IP6)) {
mtx_unlock(&pr->pr_mtx);
return (0);
}
if (pr->pr_addrs[PR_INET6] == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
prison_bcopy_primary_ip6(pr, ia6);
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Return 1 if we should do proper source address selection or are not jailed.
* We will return 0 if we should bypass source address selection in favour
* of the primary jail IPv6 address. Only in this case *ia will be updated and
* returned in NBO.
* Return EAFNOSUPPORT, in case this jail does not allow IPv6.
*/
int
prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
{
struct prison *pr;
struct in6_addr lia6;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
if (!jailed(cred))
return (1);
pr = cred->cr_prison;
if (pr->pr_flags & PR_IP6_SADDRSEL)
return (1);
lia6 = in6addr_any;
error = prison_get_ip6(cred, &lia6);
if (error)
return (error);
if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
return (1);
bcopy(&lia6, ia6, sizeof(struct in6_addr));
return (0);
}
/*
* Return true if pr1 and pr2 have the same IPv6 address restrictions.
*/
int
prison_equal_ip6(struct prison *pr1, struct prison *pr2)
{
if (pr1 == pr2)
return (1);
while (pr1 != &prison0 &&
#ifdef VIMAGE
!(pr1->pr_flags & PR_VNET) &&
#endif
!(pr1->pr_flags & PR_IP6_USER))
pr1 = pr1->pr_parent;
while (pr2 != &prison0 &&
#ifdef VIMAGE
!(pr2->pr_flags & PR_VNET) &&
#endif
!(pr2->pr_flags & PR_IP6_USER))
pr2 = pr2->pr_parent;
return (pr1 == pr2);
}
/*
* Make sure our (source) address is set to something meaningful to this jail.
*
* v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
* when needed while binding.
*
* Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
* EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
* doesn't allow IPv6.
*/
int
prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
pr = cred->cr_prison;
if (!(pr->pr_flags & PR_IP6))
return (0);
mtx_lock(&pr->pr_mtx);
if (!(pr->pr_flags & PR_IP6)) {
mtx_unlock(&pr->pr_mtx);
return (0);
}
if (pr->pr_addrs[PR_INET6] == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
/*
* In case there is only 1 IPv6 address, and v6only is true,
* then bind directly.
*/
if (v6only != 0 && prison_ip_cnt(pr, PR_INET6) == 1)
prison_bcopy_primary_ip6(pr, ia6);
mtx_unlock(&pr->pr_mtx);
return (0);
}
error = prison_check_ip6_locked(pr, ia6);
if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) {
prison_bcopy_primary_ip6(pr, ia6);
error = 0;
}
mtx_unlock(&pr->pr_mtx);
return (error);
}
/*
* Rewrite destination address in case we will connect to loopback address.
*
* Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
*/
int
prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
{
struct prison *pr;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
pr = cred->cr_prison;
if (!(pr->pr_flags & PR_IP6))
return (0);
mtx_lock(&pr->pr_mtx);
if (!(pr->pr_flags & PR_IP6)) {
mtx_unlock(&pr->pr_mtx);
return (0);
}
if (pr->pr_addrs[PR_INET6] == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
if (IN6_IS_ADDR_LOOPBACK(ia6) &&
prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) {
prison_bcopy_primary_ip6(pr, ia6);
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Return success because nothing had to be changed.
*/
mtx_unlock(&pr->pr_mtx);
return (0);
}
/*
* Check if given address belongs to the jail referenced by cred/prison.
*
* Returns 0 if address belongs to jail,
* EADDRNOTAVAIL if the address doesn't belong to the jail.
*/
int
prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6)
{
if (!(pr->pr_flags & PR_IP6))
return (0);
return (prison_ip_check(pr, PR_INET6, ia6));
}
int
prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6)
{
struct prison *pr;
int error;
KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
pr = cred->cr_prison;
if (!(pr->pr_flags & PR_IP6))
return (0);
mtx_lock(&pr->pr_mtx);
if (!(pr->pr_flags & PR_IP6)) {
mtx_unlock(&pr->pr_mtx);
return (0);
}
if (pr->pr_addrs[PR_INET6] == NULL) {
mtx_unlock(&pr->pr_mtx);
return (EAFNOSUPPORT);
}
error = prison_check_ip6_locked(pr, ia6);
mtx_unlock(&pr->pr_mtx);
return (error);
}
|
