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_bcopy_primary_ip6(const struct prison *pr, struct in6_addr *ia6)
72 bcopy(prison_ip_get0(pr, PR_INET6), ia6, sizeof(struct in6_addr));
76 prison_qcmp_v6(const void *ip1, const void *ip2)
78 const struct in6_addr *ia6a, *ia6b;
81 ia6a = (const struct in6_addr *)ip1;
82 ia6b = (const struct in6_addr *)ip2;
85 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
86 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
88 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
95 prison_valid_v6(const void *ip)
97 const struct in6_addr *ia = ip;
99 return (!IN6_IS_ADDR_UNSPECIFIED(ia));
103 * Pass back primary IPv6 address for this jail.
105 * If not restricted return success but do not alter the address. Caller has
106 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
108 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
111 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
115 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
116 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
118 pr = cred->cr_prison;
119 if (!(pr->pr_flags & PR_IP6))
121 mtx_lock(&pr->pr_mtx);
122 if (!(pr->pr_flags & PR_IP6)) {
123 mtx_unlock(&pr->pr_mtx);
126 if (pr->pr_addrs[PR_INET6] == NULL) {
127 mtx_unlock(&pr->pr_mtx);
128 return (EAFNOSUPPORT);
131 prison_bcopy_primary_ip6(pr, ia6);
132 mtx_unlock(&pr->pr_mtx);
137 * Return 1 if we should do proper source address selection or are not jailed.
138 * We will return 0 if we should bypass source address selection in favour
139 * of the primary jail IPv6 address. Only in this case *ia will be updated and
141 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
144 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
147 struct in6_addr lia6;
150 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
151 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
156 pr = cred->cr_prison;
157 if (pr->pr_flags & PR_IP6_SADDRSEL)
161 error = prison_get_ip6(cred, &lia6);
164 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
167 bcopy(&lia6, ia6, sizeof(struct in6_addr));
172 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
175 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
181 while (pr1 != &prison0 &&
183 !(pr1->pr_flags & PR_VNET) &&
185 !(pr1->pr_flags & PR_IP6_USER))
186 pr1 = pr1->pr_parent;
187 while (pr2 != &prison0 &&
189 !(pr2->pr_flags & PR_VNET) &&
191 !(pr2->pr_flags & PR_IP6_USER))
192 pr2 = pr2->pr_parent;
197 * Make sure our (source) address is set to something meaningful to this jail.
199 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
200 * when needed while binding.
202 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
203 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
204 * doesn't allow IPv6.
207 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
212 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
213 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
215 pr = cred->cr_prison;
216 if (!(pr->pr_flags & PR_IP6))
218 mtx_lock(&pr->pr_mtx);
219 if (!(pr->pr_flags & PR_IP6)) {
220 mtx_unlock(&pr->pr_mtx);
223 if (pr->pr_addrs[PR_INET6] == NULL) {
224 mtx_unlock(&pr->pr_mtx);
225 return (EAFNOSUPPORT);
228 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
230 * In case there is only 1 IPv6 address, and v6only is true,
231 * then bind directly.
233 if (v6only != 0 && prison_ip_cnt(pr, PR_INET6) == 1)
234 prison_bcopy_primary_ip6(pr, ia6);
235 mtx_unlock(&pr->pr_mtx);
239 error = prison_check_ip6_locked(pr, ia6);
240 if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) {
241 prison_bcopy_primary_ip6(pr, ia6);
245 mtx_unlock(&pr->pr_mtx);
250 * Rewrite destination address in case we will connect to loopback address.
252 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
255 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
259 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
260 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
262 pr = cred->cr_prison;
263 if (!(pr->pr_flags & PR_IP6))
265 mtx_lock(&pr->pr_mtx);
266 if (!(pr->pr_flags & PR_IP6)) {
267 mtx_unlock(&pr->pr_mtx);
270 if (pr->pr_addrs[PR_INET6] == NULL) {
271 mtx_unlock(&pr->pr_mtx);
272 return (EAFNOSUPPORT);
275 if (IN6_IS_ADDR_LOOPBACK(ia6) &&
276 prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) {
277 prison_bcopy_primary_ip6(pr, ia6);
278 mtx_unlock(&pr->pr_mtx);
283 * Return success because nothing had to be changed.
285 mtx_unlock(&pr->pr_mtx);
290 * Check if given address belongs to the jail referenced by cred/prison.
292 * Returns 0 if address belongs to jail,
293 * EADDRNOTAVAIL if the address doesn't belong to the jail.
296 prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6)
299 if (!(pr->pr_flags & PR_IP6))
302 return (prison_ip_check(pr, PR_INET6, ia6));
306 prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6)
311 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
312 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
314 pr = cred->cr_prison;
315 if (!(pr->pr_flags & PR_IP6))
317 mtx_lock(&pr->pr_mtx);
318 if (!(pr->pr_flags & PR_IP6)) {
319 mtx_unlock(&pr->pr_mtx);
322 if (pr->pr_addrs[PR_INET6] == NULL) {
323 mtx_unlock(&pr->pr_mtx);
324 return (EAFNOSUPPORT);
327 error = prison_check_ip6_locked(pr, ia6);
328 mtx_unlock(&pr->pr_mtx);