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_bcopy_primary_ip6(const struct prison *pr, struct in6_addr *ia6)
71 bcopy(prison_ip_get0(pr, PR_INET6), ia6, sizeof(struct in6_addr));
75 prison_qcmp_v6(const void *ip1, const void *ip2)
77 const struct in6_addr *ia6a, *ia6b;
80 ia6a = (const struct in6_addr *)ip1;
81 ia6b = (const struct in6_addr *)ip2;
84 for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
85 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
87 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
94 prison_valid_v6(const void *ip)
96 const struct in6_addr *ia = ip;
98 return (!IN6_IS_ADDR_UNSPECIFIED(ia));
102 * Pass back primary IPv6 address for this jail.
104 * If not restricted return success but do not alter the address. Caller has
105 * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
107 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
110 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
114 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
115 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
117 pr = cred->cr_prison;
118 if (!(pr->pr_flags & PR_IP6))
120 mtx_lock(&pr->pr_mtx);
121 if (!(pr->pr_flags & PR_IP6)) {
122 mtx_unlock(&pr->pr_mtx);
125 if (pr->pr_addrs[PR_INET6] == NULL) {
126 mtx_unlock(&pr->pr_mtx);
127 return (EAFNOSUPPORT);
130 prison_bcopy_primary_ip6(pr, ia6);
131 mtx_unlock(&pr->pr_mtx);
136 * Return 1 if we should do proper source address selection or are not jailed.
137 * We will return 0 if we should bypass source address selection in favour
138 * of the primary jail IPv6 address. Only in this case *ia will be updated and
140 * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
143 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
146 struct in6_addr lia6;
149 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
150 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
155 pr = cred->cr_prison;
156 if (pr->pr_flags & PR_IP6_SADDRSEL)
160 error = prison_get_ip6(cred, &lia6);
163 if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
166 bcopy(&lia6, ia6, sizeof(struct in6_addr));
171 * Return true if pr1 and pr2 have the same IPv6 address restrictions.
174 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
180 while (pr1 != &prison0 &&
182 !(pr1->pr_flags & PR_VNET) &&
184 !(pr1->pr_flags & PR_IP6_USER))
185 pr1 = pr1->pr_parent;
186 while (pr2 != &prison0 &&
188 !(pr2->pr_flags & PR_VNET) &&
190 !(pr2->pr_flags & PR_IP6_USER))
191 pr2 = pr2->pr_parent;
196 * Make sure our (source) address is set to something meaningful to this jail.
198 * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
199 * when needed while binding.
201 * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
202 * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
203 * doesn't allow IPv6.
206 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
211 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
212 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
214 pr = cred->cr_prison;
215 if (!(pr->pr_flags & PR_IP6))
217 mtx_lock(&pr->pr_mtx);
218 if (!(pr->pr_flags & PR_IP6)) {
219 mtx_unlock(&pr->pr_mtx);
222 if (pr->pr_addrs[PR_INET6] == NULL) {
223 mtx_unlock(&pr->pr_mtx);
224 return (EAFNOSUPPORT);
227 if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
229 * In case there is only 1 IPv6 address, and v6only is true,
230 * then bind directly.
232 if (v6only != 0 && prison_ip_cnt(pr, PR_INET6) == 1)
233 prison_bcopy_primary_ip6(pr, ia6);
234 mtx_unlock(&pr->pr_mtx);
238 error = prison_check_ip6_locked(pr, ia6);
239 if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) {
240 prison_bcopy_primary_ip6(pr, ia6);
244 mtx_unlock(&pr->pr_mtx);
249 * Rewrite destination address in case we will connect to loopback address.
251 * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
254 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
258 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
259 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
261 pr = cred->cr_prison;
262 if (!(pr->pr_flags & PR_IP6))
264 mtx_lock(&pr->pr_mtx);
265 if (!(pr->pr_flags & PR_IP6)) {
266 mtx_unlock(&pr->pr_mtx);
269 if (pr->pr_addrs[PR_INET6] == NULL) {
270 mtx_unlock(&pr->pr_mtx);
271 return (EAFNOSUPPORT);
274 if (IN6_IS_ADDR_LOOPBACK(ia6) &&
275 prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) {
276 prison_bcopy_primary_ip6(pr, ia6);
277 mtx_unlock(&pr->pr_mtx);
282 * Return success because nothing had to be changed.
284 mtx_unlock(&pr->pr_mtx);
289 * Check if given address belongs to the jail referenced by cred/prison.
291 * Returns 0 if address belongs to jail,
292 * EADDRNOTAVAIL if the address doesn't belong to the jail.
295 prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6)
298 if (!(pr->pr_flags & PR_IP6))
301 return (prison_ip_check(pr, PR_INET6, ia6));
305 prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6)
310 KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
311 KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
313 pr = cred->cr_prison;
314 if (!(pr->pr_flags & PR_IP6))
316 mtx_lock(&pr->pr_mtx);
317 if (!(pr->pr_flags & PR_IP6)) {
318 mtx_unlock(&pr->pr_mtx);
321 if (pr->pr_addrs[PR_INET6] == NULL) {
322 mtx_unlock(&pr->pr_mtx);
323 return (EAFNOSUPPORT);
326 error = prison_check_ip6_locked(pr, ia6);
327 mtx_unlock(&pr->pr_mtx);