2 * Copyright (c) 1999 Poul-Henning Kamp.
3 * Copyright (c) 2008 Bjoern A. Zeeb.
4 * Copyright (c) 2009 James Gritton.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include "opt_inet6.h"
36 #include <sys/param.h>
37 #include <sys/types.h>
38 #include <sys/kernel.h>
39 #include <sys/systm.h>
40 #include <sys/errno.h>
41 #include <sys/sysproto.h>
42 #include <sys/malloc.h>
46 #include <sys/taskqueue.h>
47 #include <sys/fcntl.h>
50 #include <sys/mutex.h>
51 #include <sys/racct.h>
52 #include <sys/refcount.h>
54 #include <sys/namei.h>
55 #include <sys/mount.h>
56 #include <sys/queue.h>
57 #include <sys/socket.h>
58 #include <sys/syscallsubr.h>
59 #include <sys/sysctl.h>
60 #include <sys/vnode.h>
65 #include <netinet/in.h>
68 prison_qcmp_v4(const void *ip1, const void *ip2)
73 * We need to compare in HBO here to get the list sorted as expected
74 * by the result of the code. Sorting NBO addresses gives you
75 * interesting results. If you do not understand, do not try.
77 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
78 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
81 * Do not simply return the difference of the two numbers, the int is
93 * Restrict a prison's IP address list with its parent's, possibly replacing
94 * it. Return true if the replacement buffer was used (or would have been).
97 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
103 if (!(pr->pr_flags & PR_IP4_USER)) {
104 /* This has no user settings, so just copy the parent's list. */
105 if (pr->pr_ip4s < ppr->pr_ip4s) {
107 * There's no room for the parent's list. Use the
108 * new list buffer, which is assumed to be big enough
109 * (if it was passed). If there's no buffer, try to
113 if (newip4 == NULL) {
114 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
119 if (newip4 != NULL) {
120 bcopy(ppr->pr_ip4, newip4,
121 ppr->pr_ip4s * sizeof(*newip4));
122 free(pr->pr_ip4, M_PRISON);
124 pr->pr_ip4s = ppr->pr_ip4s;
128 pr->pr_ip4s = ppr->pr_ip4s;
130 bcopy(ppr->pr_ip4, pr->pr_ip4,
131 pr->pr_ip4s * sizeof(*newip4));
132 else if (pr->pr_ip4 != NULL) {
133 free(pr->pr_ip4, M_PRISON);
136 } else if (pr->pr_ip4s > 0) {
137 /* Remove addresses that aren't in the parent. */
138 for (ij = 0; ij < ppr->pr_ip4s; ij++)
139 if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
141 if (ij < ppr->pr_ip4s)
144 bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
145 --pr->pr_ip4s * sizeof(*pr->pr_ip4));
148 for (ij = 1; ii < pr->pr_ip4s; ) {
149 if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
153 switch (ij >= ppr->pr_ip4s ? -1 :
154 prison_qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
156 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
157 (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
168 if (pr->pr_ip4s == 0) {
169 free(pr->pr_ip4, M_PRISON);
177 * Pass back primary IPv4 address of this jail.
179 * If not restricted return success but do not alter the address. Caller has
180 * to make sure to initialize it correctly (e.g. INADDR_ANY).
182 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
183 * Address returned in NBO.
186 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
190 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
191 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
193 pr = cred->cr_prison;
194 if (!(pr->pr_flags & PR_IP4))
196 mtx_lock(&pr->pr_mtx);
197 if (!(pr->pr_flags & PR_IP4)) {
198 mtx_unlock(&pr->pr_mtx);
201 if (pr->pr_ip4 == NULL) {
202 mtx_unlock(&pr->pr_mtx);
203 return (EAFNOSUPPORT);
206 ia->s_addr = pr->pr_ip4[0].s_addr;
207 mtx_unlock(&pr->pr_mtx);
212 * Return 1 if we should do proper source address selection or are not jailed.
213 * We will return 0 if we should bypass source address selection in favour
214 * of the primary jail IPv4 address. Only in this case *ia will be updated and
216 * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
219 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
225 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
226 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
231 pr = cred->cr_prison;
232 if (pr->pr_flags & PR_IP4_SADDRSEL)
235 lia.s_addr = INADDR_ANY;
236 error = prison_get_ip4(cred, &lia);
239 if (lia.s_addr == INADDR_ANY)
242 ia->s_addr = lia.s_addr;
247 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
250 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
257 * No need to lock since the PR_IP4_USER flag can't be altered for
260 while (pr1 != &prison0 &&
262 !(pr1->pr_flags & PR_VNET) &&
264 !(pr1->pr_flags & PR_IP4_USER))
265 pr1 = pr1->pr_parent;
266 while (pr2 != &prison0 &&
268 !(pr2->pr_flags & PR_VNET) &&
270 !(pr2->pr_flags & PR_IP4_USER))
271 pr2 = pr2->pr_parent;
276 * Make sure our (source) address is set to something meaningful to this
279 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
280 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
281 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
284 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
290 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
291 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
293 pr = cred->cr_prison;
294 if (!(pr->pr_flags & PR_IP4))
296 mtx_lock(&pr->pr_mtx);
297 if (!(pr->pr_flags & PR_IP4)) {
298 mtx_unlock(&pr->pr_mtx);
301 if (pr->pr_ip4 == NULL) {
302 mtx_unlock(&pr->pr_mtx);
303 return (EAFNOSUPPORT);
306 ia0.s_addr = ntohl(ia->s_addr);
308 if (ia0.s_addr == INADDR_ANY) {
310 * In case there is only 1 IPv4 address, bind directly.
312 if (pr->pr_ip4s == 1)
313 ia->s_addr = pr->pr_ip4[0].s_addr;
314 mtx_unlock(&pr->pr_mtx);
318 error = prison_check_ip4_locked(pr, ia);
319 if (error == EADDRNOTAVAIL && ia0.s_addr == INADDR_LOOPBACK) {
320 ia->s_addr = pr->pr_ip4[0].s_addr;
324 mtx_unlock(&pr->pr_mtx);
329 * Rewrite destination address in case we will connect to loopback address.
331 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
332 * Address passed in in NBO and returned in NBO.
335 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
339 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
340 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
342 pr = cred->cr_prison;
343 if (!(pr->pr_flags & PR_IP4))
345 mtx_lock(&pr->pr_mtx);
346 if (!(pr->pr_flags & PR_IP4)) {
347 mtx_unlock(&pr->pr_mtx);
350 if (pr->pr_ip4 == NULL) {
351 mtx_unlock(&pr->pr_mtx);
352 return (EAFNOSUPPORT);
355 if (ntohl(ia->s_addr) == INADDR_LOOPBACK &&
356 prison_check_ip4_locked(pr, ia) == EADDRNOTAVAIL) {
357 ia->s_addr = pr->pr_ip4[0].s_addr;
358 mtx_unlock(&pr->pr_mtx);
363 * Return success because nothing had to be changed.
365 mtx_unlock(&pr->pr_mtx);
370 * Check if given address belongs to the jail referenced by cred/prison.
372 * Returns 0 if address belongs to jail,
373 * EADDRNOTAVAIL if the address doesn't belong to the jail.
376 prison_check_ip4_locked(const struct prison *pr, const struct in_addr *ia)
381 * Check the primary IP.
383 if (pr->pr_ip4[0].s_addr == ia->s_addr)
387 * All the other IPs are sorted so we can do a binary search.
393 d = prison_qcmp_v4(&pr->pr_ip4[i+1], ia);
402 return (EADDRNOTAVAIL);
406 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
411 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
412 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
414 pr = cred->cr_prison;
415 if (!(pr->pr_flags & PR_IP4))
417 mtx_lock(&pr->pr_mtx);
418 if (!(pr->pr_flags & PR_IP4)) {
419 mtx_unlock(&pr->pr_mtx);
422 if (pr->pr_ip4 == NULL) {
423 mtx_unlock(&pr->pr_mtx);
424 return (EAFNOSUPPORT);
427 error = prison_check_ip4_locked(pr, ia);
428 mtx_unlock(&pr->pr_mtx);