/*- * Copyright (c) 1999 Poul-Henning Kamp. * Copyright (c) 2008 Bjoern A. Zeeb. * Copyright (c) 2009 James Gritton. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include "opt_ddb.h" #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void prison_bcopy_primary_ip6(const struct prison *pr, struct in6_addr *ia6) { bcopy(prison_ip_get0(pr, PR_INET6), ia6, sizeof(struct in6_addr)); } int prison_qcmp_v6(const void *ip1, const void *ip2) { const struct in6_addr *ia6a, *ia6b; int i, rc; ia6a = (const struct in6_addr *)ip1; ia6b = (const struct in6_addr *)ip2; rc = 0; for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) { if (ia6a->s6_addr[i] > ia6b->s6_addr[i]) rc = 1; else if (ia6a->s6_addr[i] < ia6b->s6_addr[i]) rc = -1; } return (rc); } bool prison_valid_v6(const void *ip) { const struct in6_addr *ia = ip; return (!IN6_IS_ADDR_UNSPECIFIED(ia)); } /* * Pass back primary IPv6 address for this jail. * * If not restricted return success but do not alter the address. Caller has * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT). * * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. */ int prison_get_ip6(struct ucred *cred, struct in6_addr *ia6) { struct prison *pr; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP6)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP6)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET6] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } prison_bcopy_primary_ip6(pr, ia6); mtx_unlock(&pr->pr_mtx); return (0); } /* * Return true if we should do proper source address selection or are not jailed. * We will return false if we should bypass source address selection in favour * of the primary jail IPv6 address. Only in this case *ia will be updated and * returned in NBO. * Return true, even in case this jail does not allow IPv6. */ bool prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6) { struct prison *pr; struct in6_addr lia6; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); if (!jailed(cred)) return (true); pr = cred->cr_prison; if (pr->pr_flags & PR_IP6_SADDRSEL) return (true); lia6 = in6addr_any; if (prison_get_ip6(cred, &lia6) != 0) return (true); if (IN6_IS_ADDR_UNSPECIFIED(&lia6)) return (true); bcopy(&lia6, ia6, sizeof(struct in6_addr)); return (false); } /* * Return true if pr1 and pr2 have the same IPv6 address restrictions. */ bool prison_equal_ip6(struct prison *pr1, struct prison *pr2) { if (pr1 == pr2) return (true); while (pr1 != &prison0 && #ifdef VIMAGE !(pr1->pr_flags & PR_VNET) && #endif !(pr1->pr_flags & PR_IP6_USER)) pr1 = pr1->pr_parent; while (pr2 != &prison0 && #ifdef VIMAGE !(pr2->pr_flags & PR_VNET) && #endif !(pr2->pr_flags & PR_IP6_USER)) pr2 = pr2->pr_parent; return (pr1 == pr2); } /* * Make sure our (source) address is set to something meaningful to this jail. * * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0) * when needed while binding. * * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail, * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail * doesn't allow IPv6. */ int prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only) { struct prison *pr; int error; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP6)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP6)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET6] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } if (IN6_IS_ADDR_UNSPECIFIED(ia6)) { /* * In case there is only 1 IPv6 address, and v6only is true, * then bind directly. */ if (v6only != 0 && prison_ip_cnt(pr, PR_INET6) == 1) prison_bcopy_primary_ip6(pr, ia6); mtx_unlock(&pr->pr_mtx); return (0); } error = prison_check_ip6_locked(pr, ia6); if (error == EADDRNOTAVAIL && IN6_IS_ADDR_LOOPBACK(ia6)) { prison_bcopy_primary_ip6(pr, ia6); error = 0; } mtx_unlock(&pr->pr_mtx); return (error); } /* * Rewrite destination address in case we will connect to loopback address. * * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6. */ int prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6) { struct prison *pr; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP6)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP6)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET6] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } if (IN6_IS_ADDR_LOOPBACK(ia6) && prison_check_ip6_locked(pr, ia6) == EADDRNOTAVAIL) { prison_bcopy_primary_ip6(pr, ia6); mtx_unlock(&pr->pr_mtx); return (0); } /* * Return success because nothing had to be changed. */ mtx_unlock(&pr->pr_mtx); return (0); } /* * Check if given address belongs to the jail referenced by cred/prison. * * Returns 0 if address belongs to jail, * EADDRNOTAVAIL if the address doesn't belong to the jail. */ int prison_check_ip6_locked(const struct prison *pr, const struct in6_addr *ia6) { if (!(pr->pr_flags & PR_IP6)) return (0); return (prison_ip_check(pr, PR_INET6, ia6)); } int prison_check_ip6(const struct ucred *cred, const struct in6_addr *ia6) { struct prison *pr; int error; KASSERT(cred != NULL, ("%s: cred is NULL", __func__)); KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__)); pr = cred->cr_prison; if (!(pr->pr_flags & PR_IP6)) return (0); mtx_lock(&pr->pr_mtx); if (!(pr->pr_flags & PR_IP6)) { mtx_unlock(&pr->pr_mtx); return (0); } if (pr->pr_addrs[PR_INET6] == NULL) { mtx_unlock(&pr->pr_mtx); return (EAFNOSUPPORT); } error = prison_check_ip6_locked(pr, ia6); mtx_unlock(&pr->pr_mtx); return (error); }