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 1 if we should do proper source address selection or are not jailed.
148 * We will return 0 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 EAFNOSUPPORT, in case this jail does not allow IPv4.
154 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
160 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
161 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
166 pr = cred->cr_prison;
167 if (pr->pr_flags & PR_IP4_SADDRSEL)
170 lia.s_addr = INADDR_ANY;
171 error = prison_get_ip4(cred, &lia);
174 if (lia.s_addr == INADDR_ANY)
177 ia->s_addr = lia.s_addr;
182 * Return true if pr1 and pr2 have the same IPv4 address restrictions.
185 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
192 * No need to lock since the PR_IP4_USER flag can't be altered for
195 while (pr1 != &prison0 &&
197 !(pr1->pr_flags & PR_VNET) &&
199 !(pr1->pr_flags & PR_IP4_USER))
200 pr1 = pr1->pr_parent;
201 while (pr2 != &prison0 &&
203 !(pr2->pr_flags & PR_VNET) &&
205 !(pr2->pr_flags & PR_IP4_USER))
206 pr2 = pr2->pr_parent;
211 * Make sure our (source) address is set to something meaningful to this
214 * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
215 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
216 * doesn't allow IPv4. Address passed in in NBO and returned in NBO.
219 prison_local_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__));
228 pr = cred->cr_prison;
229 if (!(pr->pr_flags & PR_IP4))
231 mtx_lock(&pr->pr_mtx);
232 if (!(pr->pr_flags & PR_IP4)) {
233 mtx_unlock(&pr->pr_mtx);
236 if (pr->pr_addrs[PR_INET] == NULL) {
237 mtx_unlock(&pr->pr_mtx);
238 return (EAFNOSUPPORT);
241 ia0.s_addr = ntohl(ia->s_addr);
243 if (ia0.s_addr == INADDR_ANY) {
245 * In case there is only 1 IPv4 address, bind directly.
247 if (prison_ip_cnt(pr, PR_INET) == 1)
248 ia->s_addr = prison_primary_ip4(pr);
249 mtx_unlock(&pr->pr_mtx);
253 error = prison_check_ip4_locked(pr, ia);
254 if (error == EADDRNOTAVAIL && ia0.s_addr == INADDR_LOOPBACK) {
255 ia->s_addr = prison_primary_ip4(pr);
259 mtx_unlock(&pr->pr_mtx);
264 * Rewrite destination address in case we will connect to loopback address.
266 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
267 * Address passed in in NBO and returned in NBO.
270 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
274 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
275 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
277 pr = cred->cr_prison;
278 if (!(pr->pr_flags & PR_IP4))
280 mtx_lock(&pr->pr_mtx);
281 if (!(pr->pr_flags & PR_IP4)) {
282 mtx_unlock(&pr->pr_mtx);
285 if (pr->pr_addrs[PR_INET] == NULL) {
286 mtx_unlock(&pr->pr_mtx);
287 return (EAFNOSUPPORT);
290 if (ntohl(ia->s_addr) == INADDR_LOOPBACK &&
291 prison_check_ip4_locked(pr, ia) == EADDRNOTAVAIL) {
292 ia->s_addr = prison_primary_ip4(pr);
293 mtx_unlock(&pr->pr_mtx);
298 * Return success because nothing had to be changed.
300 mtx_unlock(&pr->pr_mtx);
305 * Check if given address belongs to the jail referenced by cred/prison.
307 * Returns 0 if address belongs to jail,
308 * EADDRNOTAVAIL if the address doesn't belong to the jail.
311 prison_check_ip4_locked(const struct prison *pr, const struct in_addr *ia)
314 if (!(pr->pr_flags & PR_IP4))
317 return (prison_ip_check(pr, PR_INET, ia));
321 prison_check_ip4(const struct ucred *cred, const struct in_addr *ia)
326 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
327 KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
329 pr = cred->cr_prison;
330 if (!(pr->pr_flags & PR_IP4))
332 mtx_lock(&pr->pr_mtx);
333 if (!(pr->pr_flags & PR_IP4)) {
334 mtx_unlock(&pr->pr_mtx);
337 if (pr->pr_addrs[PR_INET] == NULL) {
338 mtx_unlock(&pr->pr_mtx);
339 return (EAFNOSUPPORT);
342 error = prison_check_ip4_locked(pr, ia);
343 mtx_unlock(&pr->pr_mtx);