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_primary_ip4(const struct prison *pr)
71 return (((const struct in_addr *)prison_ip_get0(pr, PR_INET))->s_addr);
75 prison_qcmp_v4(const void *ip1, const void *ip2)
80 * We need to compare in HBO here to get the list sorted as expected
81 * by the result of the code. Sorting NBO addresses gives you
82 * interesting results. If you do not understand, do not try.
84 iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
85 iab = ntohl(((const struct in_addr *)ip2)->s_addr);
88 * Do not simply return the difference of the two numbers, the int is
100 prison_valid_v4(const void *ip)
102 in_addr_t ia = ((const struct in_addr *)ip)->s_addr;
105 * We do not have to care about byte order for these
106 * checks so we will do them in NBO.
108 return (ia != INADDR_ANY && ia != INADDR_BROADCAST);
112 * Pass back primary IPv4 address of this jail.
114 * If not restricted return success but do not alter the address. Caller has
115 * to make sure to initialize it correctly (e.g. INADDR_ANY).
117 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
118 * Address returned in NBO.
121 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
125 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
126 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
128 pr = cred->cr_prison;
129 if (!(pr->pr_flags & PR_IP4))
131 mtx_lock(&pr->pr_mtx);
132 if (!(pr->pr_flags & PR_IP4)) {
133 mtx_unlock(&pr->pr_mtx);
136 if (pr->pr_addrs[PR_INET] == NULL) {
137 mtx_unlock(&pr->pr_mtx);
138 return (EAFNOSUPPORT);
141 ia->s_addr = prison_primary_ip4(pr);
142 mtx_unlock(&pr->pr_mtx);
147 * Return true if we should do proper source address selection or are not jailed.
148 * We will return false if we should bypass source address selection in favour
149 * of the primary jail IPv4 address. Only in this case *ia will be updated and
151 * Return true, even in case this jail does not allow IPv4.
154 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
159 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
160 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
165 pr = cred->cr_prison;
166 if (pr->pr_flags & PR_IP4_SADDRSEL)
169 lia.s_addr = INADDR_ANY;
170 if (prison_get_ip4(cred, &lia) != 0)
172 if (lia.s_addr == INADDR_ANY)
175 ia->s_addr = lia.s_addr;
180 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
183 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
190 * No need to lock since the PR_IP4_USER flag can't be altered for
193 while (pr1 != &prison0 &&
195 !(pr1->pr_flags & PR_VNET) &&
197 !(pr1->pr_flags & PR_IP4_USER))
198 pr1 = pr1->pr_parent;
199 while (pr2 != &prison0 &&
201 !(pr2->pr_flags & PR_VNET) &&
203 !(pr2->pr_flags & PR_IP4_USER))
204 pr2 = pr2->pr_parent;
209 * Make sure our (source) address is set to something meaningful to this
212 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
213 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
214 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
217 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
223 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
224 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
226 pr = cred->cr_prison;
227 if (!(pr->pr_flags & PR_IP4))
229 mtx_lock(&pr->pr_mtx);
230 if (!(pr->pr_flags & PR_IP4)) {
231 mtx_unlock(&pr->pr_mtx);
234 if (pr->pr_addrs[PR_INET] == NULL) {
235 mtx_unlock(&pr->pr_mtx);
236 return (EAFNOSUPPORT);
239 ia0.s_addr = ntohl(ia->s_addr);
241 if (ia0.s_addr == INADDR_ANY) {
243 * In case there is only 1 IPv4 address, bind directly.
245 if (prison_ip_cnt(pr, PR_INET) == 1)
246 ia->s_addr = prison_primary_ip4(pr);
247 mtx_unlock(&pr->pr_mtx);
251 error = prison_check_ip4_locked(pr, ia);
252 if (error == EADDRNOTAVAIL && ia0.s_addr == INADDR_LOOPBACK) {
253 ia->s_addr = prison_primary_ip4(pr);
257 mtx_unlock(&pr->pr_mtx);
262 * Rewrite destination address in case we will connect to loopback address.
264 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
265 * Address passed in in NBO and returned in NBO.
268 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
272 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
273 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
275 pr = cred->cr_prison;
276 if (!(pr->pr_flags & PR_IP4))
278 mtx_lock(&pr->pr_mtx);
279 if (!(pr->pr_flags & PR_IP4)) {
280 mtx_unlock(&pr->pr_mtx);
283 if (pr->pr_addrs[PR_INET] == NULL) {
284 mtx_unlock(&pr->pr_mtx);
285 return (EAFNOSUPPORT);
288 if (ntohl(ia->s_addr) == INADDR_LOOPBACK &&
289 prison_check_ip4_locked(pr, ia) == EADDRNOTAVAIL) {
290 ia->s_addr = prison_primary_ip4(pr);
291 mtx_unlock(&pr->pr_mtx);
296 * Return success because nothing had to be changed.
298 mtx_unlock(&pr->pr_mtx);
303 * Check if given address belongs to the jail referenced by cred/prison.
305 * Returns 0 if address belongs to jail,
306 * EADDRNOTAVAIL if the address doesn't belong to the jail.
309 prison_check_ip4_locked(const struct prison *pr, const struct in_addr *ia)
312 if (!(pr->pr_flags & PR_IP4))
315 return (prison_ip_check(pr, PR_INET, ia));
319 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
324 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
325 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
327 pr = cred->cr_prison;
328 if (!(pr->pr_flags & PR_IP4))
330 mtx_lock(&pr->pr_mtx);
331 if (!(pr->pr_flags & PR_IP4)) {
332 mtx_unlock(&pr->pr_mtx);
335 if (pr->pr_addrs[PR_INET] == NULL) {
336 mtx_unlock(&pr->pr_mtx);
337 return (EAFNOSUPPORT);
340 error = prison_check_ip4_locked(pr, ia);
341 mtx_unlock(&pr->pr_mtx);