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/sysent.h>
55 #include <sys/namei.h>
56 #include <sys/mount.h>
57 #include <sys/queue.h>
58 #include <sys/socket.h>
59 #include <sys/syscallsubr.h>
60 #include <sys/sysctl.h>
61 #include <sys/vnode.h>
66 #include <netinet/in.h>
69 prison_qcmp_v6(const void *ip1, const void *ip2)
71 const struct in6_addr *ia6a, *ia6b;
74 ia6a = (const struct in6_addr *)ip1;
75 ia6b = (const struct in6_addr *)ip2;
78 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
79 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
81 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
88 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
94 if (!(pr->pr_flags & PR_IP6_USER)) {
95 /* This has no user settings, so just copy the parent's list. */
96 if (pr->pr_ip6s < ppr->pr_ip6s) {
98 * There's no room for the parent's list. Use the
99 * new list buffer, which is assumed to be big enough
100 * (if it was passed). If there's no buffer, try to
104 if (newip6 == NULL) {
105 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
110 if (newip6 != NULL) {
111 bcopy(ppr->pr_ip6, newip6,
112 ppr->pr_ip6s * sizeof(*newip6));
113 free(pr->pr_ip6, M_PRISON);
115 pr->pr_ip6s = ppr->pr_ip6s;
119 pr->pr_ip6s = ppr->pr_ip6s;
121 bcopy(ppr->pr_ip6, pr->pr_ip6,
122 pr->pr_ip6s * sizeof(*newip6));
123 else if (pr->pr_ip6 != NULL) {
124 free(pr->pr_ip6, M_PRISON);
127 } else if (pr->pr_ip6s > 0) {
128 /* Remove addresses that aren't in the parent. */
129 for (ij = 0; ij < ppr->pr_ip6s; ij++)
130 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
133 if (ij < ppr->pr_ip6s)
136 bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
137 --pr->pr_ip6s * sizeof(*pr->pr_ip6));
140 for (ij = 1; ii < pr->pr_ip6s; ) {
141 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
146 switch (ij >= ppr->pr_ip6s ? -1 :
147 prison_qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
149 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
150 (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
161 if (pr->pr_ip6s == 0) {
162 free(pr->pr_ip6, M_PRISON);
170 * Pass back primary IPv6 address for this jail.
172 * If not restricted return success but do not alter the address. Caller has
173 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
175 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
178 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
182 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
183 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
185 pr = cred->cr_prison;
186 if (!(pr->pr_flags & PR_IP6))
188 mtx_lock(&pr->pr_mtx);
189 if (!(pr->pr_flags & PR_IP6)) {
190 mtx_unlock(&pr->pr_mtx);
193 if (pr->pr_ip6 == NULL) {
194 mtx_unlock(&pr->pr_mtx);
195 return (EAFNOSUPPORT);
198 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
199 mtx_unlock(&pr->pr_mtx);
204 * Return 1 if we should do proper source address selection or are not jailed.
205 * We will return 0 if we should bypass source address selection in favour
206 * of the primary jail IPv6 address. Only in this case *ia will be updated and
208 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
211 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
214 struct in6_addr lia6;
217 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
218 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
223 pr = cred->cr_prison;
224 if (pr->pr_flags & PR_IP6_SADDRSEL)
228 error = prison_get_ip6(cred, &lia6);
231 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
234 bcopy(&lia6, ia6, sizeof(struct in6_addr));
239 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
242 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
248 while (pr1 != &prison0 &&
250 !(pr1->pr_flags & PR_VNET) &&
252 !(pr1->pr_flags & PR_IP6_USER))
253 pr1 = pr1->pr_parent;
254 while (pr2 != &prison0 &&
256 !(pr2->pr_flags & PR_VNET) &&
258 !(pr2->pr_flags & PR_IP6_USER))
259 pr2 = pr2->pr_parent;
264 * Make sure our (source) address is set to something meaningful to this jail.
266 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
267 * when needed while binding.
269 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
270 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
271 * doesn't allow IPv6.
274 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
279 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
280 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
282 pr = cred->cr_prison;
283 if (!(pr->pr_flags & PR_IP6))
285 mtx_lock(&pr->pr_mtx);
286 if (!(pr->pr_flags & PR_IP6)) {
287 mtx_unlock(&pr->pr_mtx);
290 if (pr->pr_ip6 == NULL) {
291 mtx_unlock(&pr->pr_mtx);
292 return (EAFNOSUPPORT);
295 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
297 * In case there is only 1 IPv6 address, and v6only is true,
298 * then bind directly.
300 if (v6only != 0 && pr->pr_ip6s == 1)
301 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
302 mtx_unlock(&pr->pr_mtx);
306 error = prison_check_ip6_locked(pr, ia6);
307 if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) {
308 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
312 mtx_unlock(&pr->pr_mtx);
317 * Rewrite destination address in case we will connect to loopback address.
319 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
322 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
326 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
327 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
329 pr = cred->cr_prison;
330 if (!(pr->pr_flags & PR_IP6))
332 mtx_lock(&pr->pr_mtx);
333 if (!(pr->pr_flags & PR_IP6)) {
334 mtx_unlock(&pr->pr_mtx);
337 if (pr->pr_ip6 == NULL) {
338 mtx_unlock(&pr->pr_mtx);
339 return (EAFNOSUPPORT);
342 if (IN6_IS_ADDR_LOOPBACK(ia6) &&
343 prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) {
344 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
345 mtx_unlock(&pr->pr_mtx);
350 * Return success because nothing had to be changed.
352 mtx_unlock(&pr->pr_mtx);
357 * Check if given address belongs to the jail referenced by cred/prison.
359 * Returns 0 if address belongs to jail,
360 * EADDRNOTAVAIL if the address doesn't belong to the jail.
363 prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6)
368 * Check the primary IP.
370 if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
374 * All the other IPs are sorted so we can do a binary search.
380 d = prison_qcmp_v6(&pr->pr_ip6[i+1], ia6);
389 return (EADDRNOTAVAIL);
393 prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6)
398 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
399 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
401 pr = cred->cr_prison;
402 if (!(pr->pr_flags & PR_IP6))
404 mtx_lock(&pr->pr_mtx);
405 if (!(pr->pr_flags & PR_IP6)) {
406 mtx_unlock(&pr->pr_mtx);
409 if (pr->pr_ip6 == NULL) {
410 mtx_unlock(&pr->pr_mtx);
411 return (EAFNOSUPPORT);
414 error = prison_check_ip6_locked(pr, ia6);
415 mtx_unlock(&pr->pr_mtx);