The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_jail.c

Version: -  FREEBSD  -  FREEBSD11  -  FREEBSD10  -  FREEBSD9  -  FREEBSD92  -  FREEBSD91  -  FREEBSD90  -  FREEBSD8  -  FREEBSD82  -  FREEBSD81  -  FREEBSD80  -  FREEBSD7  -  FREEBSD74  -  FREEBSD73  -  FREEBSD72  -  FREEBSD71  -  FREEBSD70  -  FREEBSD6  -  FREEBSD64  -  FREEBSD63  -  FREEBSD62  -  FREEBSD61  -  FREEBSD60  -  FREEBSD5  -  FREEBSD55  -  FREEBSD54  -  FREEBSD53  -  FREEBSD52  -  FREEBSD51  -  FREEBSD50  -  FREEBSD4  -  FREEBSD3  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 1999 Poul-Henning Kamp.
    3  * Copyright (c) 2008 Bjoern A. Zeeb.
    4  * Copyright (c) 2009 James Gritton.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   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.
   15  *
   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
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/10/sys/kern/kern_jail.c 339410 2018-10-17 16:17:56Z jamie $");
   31 
   32 #include "opt_compat.h"
   33 #include "opt_ddb.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/types.h>
   39 #include <sys/kernel.h>
   40 #include <sys/systm.h>
   41 #include <sys/errno.h>
   42 #include <sys/sysproto.h>
   43 #include <sys/malloc.h>
   44 #include <sys/osd.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/taskqueue.h>
   48 #include <sys/fcntl.h>
   49 #include <sys/jail.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/racct.h>
   53 #include <sys/refcount.h>
   54 #include <sys/sx.h>
   55 #include <sys/sysent.h>
   56 #include <sys/namei.h>
   57 #include <sys/mount.h>
   58 #include <sys/queue.h>
   59 #include <sys/socket.h>
   60 #include <sys/syscallsubr.h>
   61 #include <sys/sysctl.h>
   62 #include <sys/vnode.h>
   63 
   64 #include <net/if.h>
   65 #include <net/vnet.h>
   66 
   67 #include <netinet/in.h>
   68 
   69 #ifdef DDB
   70 #include <ddb/ddb.h>
   71 #ifdef INET6
   72 #include <netinet6/in6_var.h>
   73 #endif /* INET6 */
   74 #endif /* DDB */
   75 
   76 #include <security/mac/mac_framework.h>
   77 
   78 #define DEFAULT_HOSTUUID        "00000000-0000-0000-0000-000000000000"
   79 
   80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
   81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
   82 
   83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
   84 #ifdef INET
   85 #ifdef INET6
   86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
   87 #else
   88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
   89 #endif
   90 #else /* !INET */
   91 #ifdef INET6
   92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
   93 #else
   94 #define _PR_IP_SADDRSEL 0
   95 #endif
   96 #endif
   97 
   98 /* prison0 describes what is "real" about the system. */
   99 struct prison prison0 = {
  100         .pr_id          = 0,
  101         .pr_name        = "",
  102         .pr_ref         = 1,
  103         .pr_uref        = 1,
  104         .pr_path        = "/",
  105         .pr_securelevel = -1,
  106         .pr_devfs_rsnum = 0,
  107         .pr_childmax    = JAIL_MAX,
  108         .pr_hostuuid    = DEFAULT_HOSTUUID,
  109         .pr_children    = LIST_HEAD_INITIALIZER(prison0.pr_children),
  110 #ifdef VIMAGE
  111         .pr_flags       = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
  112 #else
  113         .pr_flags       = PR_HOST|_PR_IP_SADDRSEL,
  114 #endif
  115         .pr_allow       = PR_ALLOW_ALL,
  116 };
  117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
  118 
  119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
  120 struct  sx allprison_lock;
  121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
  122 struct  prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
  123 LIST_HEAD(, prison_racct) allprison_racct;
  124 int     lastprid = 0;
  125 
  126 static int do_jail_attach(struct thread *td, struct prison *pr);
  127 static void prison_complete(void *context, int pending);
  128 static void prison_deref(struct prison *pr, int flags);
  129 static char *prison_path(struct prison *pr1, struct prison *pr2);
  130 static void prison_remove_one(struct prison *pr);
  131 #ifdef RACCT
  132 static void prison_racct_attach(struct prison *pr);
  133 static void prison_racct_modify(struct prison *pr);
  134 static void prison_racct_detach(struct prison *pr);
  135 #endif
  136 #ifdef INET
  137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
  138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
  139 #endif
  140 #ifdef INET6
  141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
  142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
  143 #endif
  144 
  145 /* Flags for prison_deref */
  146 #define PD_DEREF        0x01
  147 #define PD_DEUREF       0x02
  148 #define PD_LOCKED       0x04
  149 #define PD_LIST_SLOCKED 0x08
  150 #define PD_LIST_XLOCKED 0x10
  151 
  152 /*
  153  * Parameter names corresponding to PR_* flag values.  Size values are for kvm
  154  * as we cannot figure out the size of a sparse array, or an array without a
  155  * terminating entry.
  156  */
  157 static char *pr_flag_names[] = {
  158         [0] = "persist",
  159 #ifdef INET
  160         [7] = "ip4.saddrsel",
  161 #endif
  162 #ifdef INET6
  163         [8] = "ip6.saddrsel",
  164 #endif
  165 };
  166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
  167 
  168 static char *pr_flag_nonames[] = {
  169         [0] = "nopersist",
  170 #ifdef INET
  171         [7] = "ip4.nosaddrsel",
  172 #endif
  173 #ifdef INET6
  174         [8] = "ip6.nosaddrsel",
  175 #endif
  176 };
  177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
  178 
  179 struct jailsys_flags {
  180         const char      *name;
  181         unsigned         disable;
  182         unsigned         new;
  183 } pr_flag_jailsys[] = {
  184         { "host", 0, PR_HOST },
  185 #ifdef VIMAGE
  186         { "vnet", 0, PR_VNET },
  187 #endif
  188 #ifdef INET
  189         { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
  190 #endif
  191 #ifdef INET6
  192         { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
  193 #endif
  194 };
  195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
  196 
  197 static char *pr_allow_names[] = {
  198         "allow.set_hostname",
  199         "allow.sysvipc",
  200         "allow.raw_sockets",
  201         "allow.chflags",
  202         "allow.mount",
  203         "allow.quotas",
  204         "allow.socket_af",
  205         "allow.mount.devfs",
  206         "allow.mount.nullfs",
  207         "allow.mount.zfs",
  208         "allow.mount.procfs",
  209         "allow.mount.tmpfs",
  210         "allow.mount.fdescfs",
  211         "allow.mount.linprocfs",
  212         "allow.mount.linsysfs",
  213 };
  214 const size_t pr_allow_names_size = sizeof(pr_allow_names);
  215 
  216 static char *pr_allow_nonames[] = {
  217         "allow.noset_hostname",
  218         "allow.nosysvipc",
  219         "allow.noraw_sockets",
  220         "allow.nochflags",
  221         "allow.nomount",
  222         "allow.noquotas",
  223         "allow.nosocket_af",
  224         "allow.mount.nodevfs",
  225         "allow.mount.nonullfs",
  226         "allow.mount.nozfs",
  227         "allow.mount.noprocfs",
  228         "allow.mount.notmpfs",
  229         "allow.mount.nofdescfs",
  230         "allow.mount.nolinprocfs",
  231         "allow.mount.nolinsysfs",
  232 };
  233 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
  234 
  235 #define JAIL_DEFAULT_ALLOW              PR_ALLOW_SET_HOSTNAME
  236 #define JAIL_DEFAULT_ENFORCE_STATFS     2
  237 #define JAIL_DEFAULT_DEVFS_RSNUM        0
  238 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
  239 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
  240 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
  241 #if defined(INET) || defined(INET6)
  242 static unsigned jail_max_af_ips = 255;
  243 #endif
  244 
  245 /*
  246  * Initialize the parts of prison0 that can't be static-initialized with
  247  * constants.  This is called from proc0_init() after creating thread0 cpuset.
  248  */
  249 void
  250 prison0_init(void)
  251 {
  252 
  253         prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
  254         prison0.pr_osreldate = osreldate;
  255         strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
  256 }
  257 
  258 #ifdef INET
  259 static int
  260 qcmp_v4(const void *ip1, const void *ip2)
  261 {
  262         in_addr_t iaa, iab;
  263 
  264         /*
  265          * We need to compare in HBO here to get the list sorted as expected
  266          * by the result of the code.  Sorting NBO addresses gives you
  267          * interesting results.  If you do not understand, do not try.
  268          */
  269         iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
  270         iab = ntohl(((const struct in_addr *)ip2)->s_addr);
  271 
  272         /*
  273          * Do not simply return the difference of the two numbers, the int is
  274          * not wide enough.
  275          */
  276         if (iaa > iab)
  277                 return (1);
  278         else if (iaa < iab)
  279                 return (-1);
  280         else
  281                 return (0);
  282 }
  283 #endif
  284 
  285 #ifdef INET6
  286 static int
  287 qcmp_v6(const void *ip1, const void *ip2)
  288 {
  289         const struct in6_addr *ia6a, *ia6b;
  290         int i, rc;
  291 
  292         ia6a = (const struct in6_addr *)ip1;
  293         ia6b = (const struct in6_addr *)ip2;
  294 
  295         rc = 0;
  296         for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
  297                 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
  298                         rc = 1;
  299                 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
  300                         rc = -1;
  301         }
  302         return (rc);
  303 }
  304 #endif
  305 
  306 /*
  307  * struct jail_args {
  308  *      struct jail *jail;
  309  * };
  310  */
  311 int
  312 sys_jail(struct thread *td, struct jail_args *uap)
  313 {
  314         uint32_t version;
  315         int error;
  316         struct jail j;
  317 
  318         error = copyin(uap->jail, &version, sizeof(uint32_t));
  319         if (error)
  320                 return (error);
  321 
  322         switch (version) {
  323         case 0:
  324         {
  325                 struct jail_v0 j0;
  326 
  327                 /* FreeBSD single IPv4 jails. */
  328                 bzero(&j, sizeof(struct jail));
  329                 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
  330                 if (error)
  331                         return (error);
  332                 j.version = j0.version;
  333                 j.path = j0.path;
  334                 j.hostname = j0.hostname;
  335                 j.ip4s = htonl(j0.ip_number);   /* jail_v0 is host order */
  336                 break;
  337         }
  338 
  339         case 1:
  340                 /*
  341                  * Version 1 was used by multi-IPv4 jail implementations
  342                  * that never made it into the official kernel.
  343                  */
  344                 return (EINVAL);
  345 
  346         case 2: /* JAIL_API_VERSION */
  347                 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
  348                 error = copyin(uap->jail, &j, sizeof(struct jail));
  349                 if (error)
  350                         return (error);
  351                 break;
  352 
  353         default:
  354                 /* Sci-Fi jails are not supported, sorry. */
  355                 return (EINVAL);
  356         }
  357         return (kern_jail(td, &j));
  358 }
  359 
  360 int
  361 kern_jail(struct thread *td, struct jail *j)
  362 {
  363         struct iovec optiov[2 * (4
  364                             + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
  365 #ifdef INET
  366                             + 1
  367 #endif
  368 #ifdef INET6
  369                             + 1
  370 #endif
  371                             )];
  372         struct uio opt;
  373         char *u_path, *u_hostname, *u_name;
  374 #ifdef INET
  375         uint32_t ip4s;
  376         struct in_addr *u_ip4;
  377 #endif
  378 #ifdef INET6
  379         struct in6_addr *u_ip6;
  380 #endif
  381         size_t tmplen;
  382         int error, enforce_statfs, fi;
  383 
  384         bzero(&optiov, sizeof(optiov));
  385         opt.uio_iov = optiov;
  386         opt.uio_iovcnt = 0;
  387         opt.uio_offset = -1;
  388         opt.uio_resid = -1;
  389         opt.uio_segflg = UIO_SYSSPACE;
  390         opt.uio_rw = UIO_READ;
  391         opt.uio_td = td;
  392 
  393         /* Set permissions for top-level jails from sysctls. */
  394         if (!jailed(td->td_ucred)) {
  395                 for (fi = 0; fi < sizeof(pr_allow_names) /
  396                      sizeof(pr_allow_names[0]); fi++) {
  397                         optiov[opt.uio_iovcnt].iov_base =
  398                             (jail_default_allow & (1 << fi))
  399                             ? pr_allow_names[fi] : pr_allow_nonames[fi];
  400                         optiov[opt.uio_iovcnt].iov_len =
  401                             strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
  402                         opt.uio_iovcnt += 2;
  403                 }
  404                 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
  405                 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
  406                 opt.uio_iovcnt++;
  407                 enforce_statfs = jail_default_enforce_statfs;
  408                 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
  409                 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
  410                 opt.uio_iovcnt++;
  411         }
  412 
  413         tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
  414 #ifdef INET
  415         ip4s = (j->version == 0) ? 1 : j->ip4s;
  416         if (ip4s > jail_max_af_ips)
  417                 return (EINVAL);
  418         tmplen += ip4s * sizeof(struct in_addr);
  419 #else
  420         if (j->ip4s > 0)
  421                 return (EINVAL);
  422 #endif
  423 #ifdef INET6
  424         if (j->ip6s > jail_max_af_ips)
  425                 return (EINVAL);
  426         tmplen += j->ip6s * sizeof(struct in6_addr);
  427 #else
  428         if (j->ip6s > 0)
  429                 return (EINVAL);
  430 #endif
  431         u_path = malloc(tmplen, M_TEMP, M_WAITOK);
  432         u_hostname = u_path + MAXPATHLEN;
  433         u_name = u_hostname + MAXHOSTNAMELEN;
  434 #ifdef INET
  435         u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
  436 #endif
  437 #ifdef INET6
  438 #ifdef INET
  439         u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
  440 #else
  441         u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
  442 #endif
  443 #endif
  444         optiov[opt.uio_iovcnt].iov_base = "path";
  445         optiov[opt.uio_iovcnt].iov_len = sizeof("path");
  446         opt.uio_iovcnt++;
  447         optiov[opt.uio_iovcnt].iov_base = u_path;
  448         error = copyinstr(j->path, u_path, MAXPATHLEN,
  449             &optiov[opt.uio_iovcnt].iov_len);
  450         if (error) {
  451                 free(u_path, M_TEMP);
  452                 return (error);
  453         }
  454         opt.uio_iovcnt++;
  455         optiov[opt.uio_iovcnt].iov_base = "host.hostname";
  456         optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
  457         opt.uio_iovcnt++;
  458         optiov[opt.uio_iovcnt].iov_base = u_hostname;
  459         error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
  460             &optiov[opt.uio_iovcnt].iov_len);
  461         if (error) {
  462                 free(u_path, M_TEMP);
  463                 return (error);
  464         }
  465         opt.uio_iovcnt++;
  466         if (j->jailname != NULL) {
  467                 optiov[opt.uio_iovcnt].iov_base = "name";
  468                 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
  469                 opt.uio_iovcnt++;
  470                 optiov[opt.uio_iovcnt].iov_base = u_name;
  471                 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
  472                     &optiov[opt.uio_iovcnt].iov_len);
  473                 if (error) {
  474                         free(u_path, M_TEMP);
  475                         return (error);
  476                 }
  477                 opt.uio_iovcnt++;
  478         }
  479 #ifdef INET
  480         optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
  481         optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
  482         opt.uio_iovcnt++;
  483         optiov[opt.uio_iovcnt].iov_base = u_ip4;
  484         optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
  485         if (j->version == 0)
  486                 u_ip4->s_addr = j->ip4s;
  487         else {
  488                 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
  489                 if (error) {
  490                         free(u_path, M_TEMP);
  491                         return (error);
  492                 }
  493         }
  494         opt.uio_iovcnt++;
  495 #endif
  496 #ifdef INET6
  497         optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
  498         optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
  499         opt.uio_iovcnt++;
  500         optiov[opt.uio_iovcnt].iov_base = u_ip6;
  501         optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
  502         error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
  503         if (error) {
  504                 free(u_path, M_TEMP);
  505                 return (error);
  506         }
  507         opt.uio_iovcnt++;
  508 #endif
  509         KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
  510             ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
  511         error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
  512         free(u_path, M_TEMP);
  513         return (error);
  514 }
  515 
  516 
  517 /*
  518  * struct jail_set_args {
  519  *      struct iovec *iovp;
  520  *      unsigned int iovcnt;
  521  *      int flags;
  522  * };
  523  */
  524 int
  525 sys_jail_set(struct thread *td, struct jail_set_args *uap)
  526 {
  527         struct uio *auio;
  528         int error;
  529 
  530         /* Check that we have an even number of iovecs. */
  531         if (uap->iovcnt & 1)
  532                 return (EINVAL);
  533 
  534         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
  535         if (error)
  536                 return (error);
  537         error = kern_jail_set(td, auio, uap->flags);
  538         free(auio, M_IOV);
  539         return (error);
  540 }
  541 
  542 int
  543 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
  544 {
  545         struct nameidata nd;
  546 #ifdef INET
  547         struct in_addr *ip4;
  548 #endif
  549 #ifdef INET6
  550         struct in6_addr *ip6;
  551 #endif
  552         struct vfsopt *opt;
  553         struct vfsoptlist *opts;
  554         struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
  555         struct vnode *root;
  556         char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
  557         char *g_path, *osrelstr;
  558 #if defined(INET) || defined(INET6)
  559         struct prison *tppr;
  560         void *op;
  561 #endif
  562         unsigned long hid;
  563         size_t namelen, onamelen, pnamelen;
  564         int born, created, cuflags, descend, enforce;
  565         int error, errmsg_len, errmsg_pos;
  566         int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
  567         int fi, jid, jsys, len, level;
  568         int childmax, osreldt, rsnum, slevel;
  569         int fullpath_disabled;
  570 #if defined(INET) || defined(INET6)
  571         int ii, ij;
  572 #endif
  573 #ifdef INET
  574         int ip4s, redo_ip4;
  575 #endif
  576 #ifdef INET6
  577         int ip6s, redo_ip6;
  578 #endif
  579         uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
  580         unsigned tallow;
  581         char numbuf[12];
  582 
  583         error = priv_check(td, PRIV_JAIL_SET);
  584         if (!error && (flags & JAIL_ATTACH))
  585                 error = priv_check(td, PRIV_JAIL_ATTACH);
  586         if (error)
  587                 return (error);
  588         mypr = td->td_ucred->cr_prison;
  589         if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
  590                 return (EPERM);
  591         if (flags & ~JAIL_SET_MASK)
  592                 return (EINVAL);
  593 
  594         /*
  595          * Check all the parameters before committing to anything.  Not all
  596          * errors can be caught early, but we may as well try.  Also, this
  597          * takes care of some expensive stuff (path lookup) before getting
  598          * the allprison lock.
  599          *
  600          * XXX Jails are not filesystems, and jail parameters are not mount
  601          *     options.  But it makes more sense to re-use the vfsopt code
  602          *     than duplicate it under a different name.
  603          */
  604         error = vfs_buildopts(optuio, &opts);
  605         if (error)
  606                 return (error);
  607 #ifdef INET
  608         ip4 = NULL;
  609 #endif
  610 #ifdef INET6
  611         ip6 = NULL;
  612 #endif
  613         g_path = NULL;
  614 
  615         cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
  616         if (!cuflags) {
  617                 error = EINVAL;
  618                 vfs_opterror(opts, "no valid operation (create or update)");
  619                 goto done_errmsg;
  620         }
  621 
  622         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
  623         if (error == ENOENT)
  624                 jid = 0;
  625         else if (error != 0)
  626                 goto done_free;
  627 
  628         error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
  629         if (error == ENOENT)
  630                 gotslevel = 0;
  631         else if (error != 0)
  632                 goto done_free;
  633         else
  634                 gotslevel = 1;
  635 
  636         error =
  637             vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
  638         if (error == ENOENT)
  639                 gotchildmax = 0;
  640         else if (error != 0)
  641                 goto done_free;
  642         else
  643                 gotchildmax = 1;
  644 
  645         error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
  646         if (error == ENOENT)
  647                 gotenforce = 0;
  648         else if (error != 0)
  649                 goto done_free;
  650         else if (enforce < 0 || enforce > 2) {
  651                 error = EINVAL;
  652                 goto done_free;
  653         } else
  654                 gotenforce = 1;
  655 
  656         error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
  657         if (error == ENOENT)
  658                 gotrsnum = 0;
  659         else if (error != 0)
  660                 goto done_free;
  661         else
  662                 gotrsnum = 1;
  663 
  664         pr_flags = ch_flags = 0;
  665         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
  666             fi++) {
  667                 if (pr_flag_names[fi] == NULL)
  668                         continue;
  669                 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
  670                 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
  671         }
  672         ch_flags |= pr_flags;
  673         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
  674             fi++) {
  675                 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
  676                     sizeof(jsys));
  677                 if (error == ENOENT)
  678                         continue;
  679                 if (error != 0)
  680                         goto done_free;
  681                 switch (jsys) {
  682                 case JAIL_SYS_DISABLE:
  683                         if (!pr_flag_jailsys[fi].disable) {
  684                                 error = EINVAL;
  685                                 goto done_free;
  686                         }
  687                         pr_flags |= pr_flag_jailsys[fi].disable;
  688                         break;
  689                 case JAIL_SYS_NEW:
  690                         pr_flags |= pr_flag_jailsys[fi].new;
  691                         break;
  692                 case JAIL_SYS_INHERIT:
  693                         break;
  694                 default:
  695                         error = EINVAL;
  696                         goto done_free;
  697                 }
  698                 ch_flags |=
  699                     pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
  700         }
  701         if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
  702             && !(pr_flags & PR_PERSIST)) {
  703                 error = EINVAL;
  704                 vfs_opterror(opts, "new jail must persist or attach");
  705                 goto done_errmsg;
  706         }
  707 #ifdef VIMAGE
  708         if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
  709                 error = EINVAL;
  710                 vfs_opterror(opts, "vnet cannot be changed after creation");
  711                 goto done_errmsg;
  712         }
  713 #endif
  714 #ifdef INET
  715         if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
  716                 error = EINVAL;
  717                 vfs_opterror(opts, "ip4 cannot be changed after creation");
  718                 goto done_errmsg;
  719         }
  720 #endif
  721 #ifdef INET6
  722         if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
  723                 error = EINVAL;
  724                 vfs_opterror(opts, "ip6 cannot be changed after creation");
  725                 goto done_errmsg;
  726         }
  727 #endif
  728 
  729         pr_allow = ch_allow = 0;
  730         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
  731             fi++) {
  732                 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
  733                 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
  734         }
  735         ch_allow |= pr_allow;
  736 
  737         error = vfs_getopt(opts, "name", (void **)&name, &len);
  738         if (error == ENOENT)
  739                 name = NULL;
  740         else if (error != 0)
  741                 goto done_free;
  742         else {
  743                 if (len == 0 || name[len - 1] != '\0') {
  744                         error = EINVAL;
  745                         goto done_free;
  746                 }
  747                 if (len > MAXHOSTNAMELEN) {
  748                         error = ENAMETOOLONG;
  749                         goto done_free;
  750                 }
  751         }
  752 
  753         error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
  754         if (error == ENOENT)
  755                 host = NULL;
  756         else if (error != 0)
  757                 goto done_free;
  758         else {
  759                 ch_flags |= PR_HOST;
  760                 pr_flags |= PR_HOST;
  761                 if (len == 0 || host[len - 1] != '\0') {
  762                         error = EINVAL;
  763                         goto done_free;
  764                 }
  765                 if (len > MAXHOSTNAMELEN) {
  766                         error = ENAMETOOLONG;
  767                         goto done_free;
  768                 }
  769         }
  770 
  771         error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
  772         if (error == ENOENT)
  773                 domain = NULL;
  774         else if (error != 0)
  775                 goto done_free;
  776         else {
  777                 ch_flags |= PR_HOST;
  778                 pr_flags |= PR_HOST;
  779                 if (len == 0 || domain[len - 1] != '\0') {
  780                         error = EINVAL;
  781                         goto done_free;
  782                 }
  783                 if (len > MAXHOSTNAMELEN) {
  784                         error = ENAMETOOLONG;
  785                         goto done_free;
  786                 }
  787         }
  788 
  789         error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
  790         if (error == ENOENT)
  791                 uuid = NULL;
  792         else if (error != 0)
  793                 goto done_free;
  794         else {
  795                 ch_flags |= PR_HOST;
  796                 pr_flags |= PR_HOST;
  797                 if (len == 0 || uuid[len - 1] != '\0') {
  798                         error = EINVAL;
  799                         goto done_free;
  800                 }
  801                 if (len > HOSTUUIDLEN) {
  802                         error = ENAMETOOLONG;
  803                         goto done_free;
  804                 }
  805         }
  806 
  807 #ifdef COMPAT_FREEBSD32
  808         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
  809                 uint32_t hid32;
  810 
  811                 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
  812                 hid = hid32;
  813         } else
  814 #endif
  815                 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
  816         if (error == ENOENT)
  817                 gothid = 0;
  818         else if (error != 0)
  819                 goto done_free;
  820         else {
  821                 gothid = 1;
  822                 ch_flags |= PR_HOST;
  823                 pr_flags |= PR_HOST;
  824         }
  825 
  826 #ifdef INET
  827         error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
  828         if (error == ENOENT)
  829                 ip4s = 0;
  830         else if (error != 0)
  831                 goto done_free;
  832         else if (ip4s & (sizeof(*ip4) - 1)) {
  833                 error = EINVAL;
  834                 goto done_free;
  835         } else {
  836                 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
  837                 if (ip4s == 0)
  838                         pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
  839                 else {
  840                         pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
  841                         ip4s /= sizeof(*ip4);
  842                         if (ip4s > jail_max_af_ips) {
  843                                 error = EINVAL;
  844                                 vfs_opterror(opts, "too many IPv4 addresses");
  845                                 goto done_errmsg;
  846                         }
  847                         ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
  848                         bcopy(op, ip4, ip4s * sizeof(*ip4));
  849                         /*
  850                          * IP addresses are all sorted but ip[0] to preserve
  851                          * the primary IP address as given from userland.
  852                          * This special IP is used for unbound outgoing
  853                          * connections as well for "loopback" traffic in case
  854                          * source address selection cannot find any more fitting
  855                          * address to connect from.
  856                          */
  857                         if (ip4s > 1)
  858                                 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
  859                         /*
  860                          * Check for duplicate addresses and do some simple
  861                          * zero and broadcast checks. If users give other bogus
  862                          * addresses it is their problem.
  863                          *
  864                          * We do not have to care about byte order for these
  865                          * checks so we will do them in NBO.
  866                          */
  867                         for (ii = 0; ii < ip4s; ii++) {
  868                                 if (ip4[ii].s_addr == INADDR_ANY ||
  869                                     ip4[ii].s_addr == INADDR_BROADCAST) {
  870                                         error = EINVAL;
  871                                         goto done_free;
  872                                 }
  873                                 if ((ii+1) < ip4s &&
  874                                     (ip4[0].s_addr == ip4[ii+1].s_addr ||
  875                                      ip4[ii].s_addr == ip4[ii+1].s_addr)) {
  876                                         error = EINVAL;
  877                                         goto done_free;
  878                                 }
  879                         }
  880                 }
  881         }
  882 #endif
  883 
  884 #ifdef INET6
  885         error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
  886         if (error == ENOENT)
  887                 ip6s = 0;
  888         else if (error != 0)
  889                 goto done_free;
  890         else if (ip6s & (sizeof(*ip6) - 1)) {
  891                 error = EINVAL;
  892                 goto done_free;
  893         } else {
  894                 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
  895                 if (ip6s == 0)
  896                         pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
  897                 else {
  898                         pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
  899                         ip6s /= sizeof(*ip6);
  900                         if (ip6s > jail_max_af_ips) {
  901                                 error = EINVAL;
  902                                 vfs_opterror(opts, "too many IPv6 addresses");
  903                                 goto done_errmsg;
  904                         }
  905                         ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
  906                         bcopy(op, ip6, ip6s * sizeof(*ip6));
  907                         if (ip6s > 1)
  908                                 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
  909                         for (ii = 0; ii < ip6s; ii++) {
  910                                 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
  911                                         error = EINVAL;
  912                                         goto done_free;
  913                                 }
  914                                 if ((ii+1) < ip6s &&
  915                                     (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
  916                                      IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
  917                                 {
  918                                         error = EINVAL;
  919                                         goto done_free;
  920                                 }
  921                         }
  922                 }
  923         }
  924 #endif
  925 
  926 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
  927         if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
  928                 error = EINVAL;
  929                 vfs_opterror(opts,
  930                     "vnet jails cannot have IP address restrictions");
  931                 goto done_errmsg;
  932         }
  933 #endif
  934 
  935         error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
  936         if (error == ENOENT)
  937                 osrelstr = NULL;
  938         else if (error != 0)
  939                 goto done_free;
  940         else {
  941                 if (flags & JAIL_UPDATE) {
  942                         error = EINVAL;
  943                         vfs_opterror(opts,
  944                             "osrelease cannot be changed after creation");
  945                         goto done_errmsg;
  946                 }
  947                 if (len == 0 || len >= OSRELEASELEN) {
  948                         error = EINVAL;
  949                         vfs_opterror(opts,
  950                             "osrelease string must be 1-%d bytes long",
  951                             OSRELEASELEN - 1);
  952                         goto done_errmsg;
  953                 }
  954         }
  955 
  956         error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
  957         if (error == ENOENT)
  958                 osreldt = 0;
  959         else if (error != 0)
  960                 goto done_free;
  961         else {
  962                 if (flags & JAIL_UPDATE) {
  963                         error = EINVAL;
  964                         vfs_opterror(opts,
  965                             "osreldate cannot be changed after creation");
  966                         goto done_errmsg;
  967                 }
  968                 if (osreldt == 0) {
  969                         error = EINVAL;
  970                         vfs_opterror(opts, "osreldate cannot be 0");
  971                         goto done_errmsg;
  972                 }
  973         }
  974 
  975         fullpath_disabled = 0;
  976         root = NULL;
  977         error = vfs_getopt(opts, "path", (void **)&path, &len);
  978         if (error == ENOENT)
  979                 path = NULL;
  980         else if (error != 0)
  981                 goto done_free;
  982         else {
  983                 if (flags & JAIL_UPDATE) {
  984                         error = EINVAL;
  985                         vfs_opterror(opts,
  986                             "path cannot be changed after creation");
  987                         goto done_errmsg;
  988                 }
  989                 if (len == 0 || path[len - 1] != '\0') {
  990                         error = EINVAL;
  991                         goto done_free;
  992                 }
  993                 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
  994                     path, td);
  995                 error = namei(&nd);
  996                 if (error)
  997                         goto done_free;
  998                 root = nd.ni_vp;
  999                 NDFREE(&nd, NDF_ONLY_PNBUF);
 1000                 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
 1001                 strlcpy(g_path, path, MAXPATHLEN);
 1002                 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
 1003                 if (error == 0)
 1004                         path = g_path;
 1005                 else if (error == ENODEV) {
 1006                         /* proceed if sysctl debug.disablefullpath == 1 */
 1007                         fullpath_disabled = 1;
 1008                         if (len < 2 || (len == 2 && path[0] == '/'))
 1009                                 path = NULL;
 1010                 } else {
 1011                         /* exit on other errors */
 1012                         goto done_free;
 1013                 }
 1014                 if (root->v_type != VDIR) {
 1015                         error = ENOTDIR;
 1016                         vput(root);
 1017                         goto done_free;
 1018                 }
 1019                 VOP_UNLOCK(root, 0);
 1020                 if (fullpath_disabled) {
 1021                         /* Leave room for a real-root full pathname. */
 1022                         if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
 1023                             ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
 1024                                 error = ENAMETOOLONG;
 1025                                 vrele(root);
 1026                                 goto done_free;
 1027                         }
 1028                 }
 1029         }
 1030 
 1031         /*
 1032          * Find the specified jail, or at least its parent.
 1033          * This abuses the file error codes ENOENT and EEXIST.
 1034          */
 1035         pr = NULL;
 1036         ppr = mypr;
 1037         if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
 1038                 namelc = strrchr(name, '.');
 1039                 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
 1040                 if (*p != '\0')
 1041                         jid = 0;
 1042         }
 1043         sx_xlock(&allprison_lock);
 1044         if (jid != 0) {
 1045                 /*
 1046                  * See if a requested jid already exists.  There is an
 1047                  * information leak here if the jid exists but is not within
 1048                  * the caller's jail hierarchy.  Jail creators will get EEXIST
 1049                  * even though they cannot see the jail, and CREATE | UPDATE
 1050                  * will return ENOENT which is not normally a valid error.
 1051                  */
 1052                 if (jid < 0) {
 1053                         error = EINVAL;
 1054                         vfs_opterror(opts, "negative jid");
 1055                         goto done_unlock_list;
 1056                 }
 1057                 pr = prison_find(jid);
 1058                 if (pr != NULL) {
 1059                         ppr = pr->pr_parent;
 1060                         /* Create: jid must not exist. */
 1061                         if (cuflags == JAIL_CREATE) {
 1062                                 mtx_unlock(&pr->pr_mtx);
 1063                                 error = EEXIST;
 1064                                 vfs_opterror(opts, "jail %d already exists",
 1065                                     jid);
 1066                                 goto done_unlock_list;
 1067                         }
 1068                         if (!prison_ischild(mypr, pr)) {
 1069                                 mtx_unlock(&pr->pr_mtx);
 1070                                 pr = NULL;
 1071                         } else if (pr->pr_uref == 0) {
 1072                                 if (!(flags & JAIL_DYING)) {
 1073                                         mtx_unlock(&pr->pr_mtx);
 1074                                         error = ENOENT;
 1075                                         vfs_opterror(opts, "jail %d is dying",
 1076                                             jid);
 1077                                         goto done_unlock_list;
 1078                                 } else if ((flags & JAIL_ATTACH) ||
 1079                                     (pr_flags & PR_PERSIST)) {
 1080                                         /*
 1081                                          * A dying jail might be resurrected
 1082                                          * (via attach or persist), but first
 1083                                          * it must determine if another jail
 1084                                          * has claimed its name.  Accomplish
 1085                                          * this by implicitly re-setting the
 1086                                          * name.
 1087                                          */
 1088                                         if (name == NULL)
 1089                                                 name = prison_name(mypr, pr);
 1090                                 }
 1091                         }
 1092                 }
 1093                 if (pr == NULL) {
 1094                         /* Update: jid must exist. */
 1095                         if (cuflags == JAIL_UPDATE) {
 1096                                 error = ENOENT;
 1097                                 vfs_opterror(opts, "jail %d not found", jid);
 1098                                 goto done_unlock_list;
 1099                         }
 1100                 }
 1101         }
 1102         /*
 1103          * If the caller provided a name, look for a jail by that name.
 1104          * This has different semantics for creates and updates keyed by jid
 1105          * (where the name must not already exist in a different jail),
 1106          * and updates keyed by the name itself (where the name must exist
 1107          * because that is the jail being updated).
 1108          */
 1109         namelc = NULL;
 1110         if (name != NULL) {
 1111                 namelc = strrchr(name, '.');
 1112                 if (namelc == NULL)
 1113                         namelc = name;
 1114                 else {
 1115                         /*
 1116                          * This is a hierarchical name.  Split it into the
 1117                          * parent and child names, and make sure the parent
 1118                          * exists or matches an already found jail.
 1119                          */
 1120                         if (pr != NULL) {
 1121                                 if (strncmp(name, ppr->pr_name, namelc - name)
 1122                                     || ppr->pr_name[namelc - name] != '\0') {
 1123                                         mtx_unlock(&pr->pr_mtx);
 1124                                         error = EINVAL;
 1125                                         vfs_opterror(opts,
 1126                                             "cannot change jail's parent");
 1127                                         goto done_unlock_list;
 1128                                 }
 1129                         } else {
 1130                                 *namelc = '\0';
 1131                                 ppr = prison_find_name(mypr, name);
 1132                                 if (ppr == NULL) {
 1133                                         error = ENOENT;
 1134                                         vfs_opterror(opts,
 1135                                             "jail \"%s\" not found", name);
 1136                                         goto done_unlock_list;
 1137                                 }
 1138                                 mtx_unlock(&ppr->pr_mtx);
 1139                                 *namelc = '.';
 1140                         }
 1141                         namelc++;
 1142                 }
 1143                 if (namelc[0] != '\0') {
 1144                         pnamelen =
 1145                             (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
 1146  name_again:
 1147                         deadpr = NULL;
 1148                         FOREACH_PRISON_CHILD(ppr, tpr) {
 1149                                 if (tpr != pr && tpr->pr_ref > 0 &&
 1150                                     !strcmp(tpr->pr_name + pnamelen, namelc)) {
 1151                                         if (pr == NULL &&
 1152                                             cuflags != JAIL_CREATE) {
 1153                                                 mtx_lock(&tpr->pr_mtx);
 1154                                                 if (tpr->pr_ref > 0) {
 1155                                                         /*
 1156                                                          * Use this jail
 1157                                                          * for updates.
 1158                                                          */
 1159                                                         if (tpr->pr_uref > 0) {
 1160                                                                 pr = tpr;
 1161                                                                 break;
 1162                                                         }
 1163                                                         deadpr = tpr;
 1164                                                 }
 1165                                                 mtx_unlock(&tpr->pr_mtx);
 1166                                         } else if (tpr->pr_uref > 0) {
 1167                                                 /*
 1168                                                  * Create, or update(jid):
 1169                                                  * name must not exist in an
 1170                                                  * active sibling jail.
 1171                                                  */
 1172                                                 error = EEXIST;
 1173                                                 if (pr != NULL)
 1174                                                         mtx_unlock(&pr->pr_mtx);
 1175                                                 vfs_opterror(opts,
 1176                                                    "jail \"%s\" already exists",
 1177                                                    name);
 1178                                                 goto done_unlock_list;
 1179                                         }
 1180                                 }
 1181                         }
 1182                         /* If no active jail is found, use a dying one. */
 1183                         if (deadpr != NULL && pr == NULL) {
 1184                                 if (flags & JAIL_DYING) {
 1185                                         mtx_lock(&deadpr->pr_mtx);
 1186                                         if (deadpr->pr_ref == 0) {
 1187                                                 mtx_unlock(&deadpr->pr_mtx);
 1188                                                 goto name_again;
 1189                                         }
 1190                                         pr = deadpr;
 1191                                 } else if (cuflags == JAIL_UPDATE) {
 1192                                         error = ENOENT;
 1193                                         vfs_opterror(opts,
 1194                                             "jail \"%s\" is dying", name);
 1195                                         goto done_unlock_list;
 1196                                 }
 1197                         }
 1198                         /* Update: name must exist if no jid. */
 1199                         else if (cuflags == JAIL_UPDATE && pr == NULL) {
 1200                                 error = ENOENT;
 1201                                 vfs_opterror(opts, "jail \"%s\" not found",
 1202                                     name);
 1203                                 goto done_unlock_list;
 1204                         }
 1205                 }
 1206         }
 1207         /* Update: must provide a jid or name. */
 1208         else if (cuflags == JAIL_UPDATE && pr == NULL) {
 1209                 error = ENOENT;
 1210                 vfs_opterror(opts, "update specified no jail");
 1211                 goto done_unlock_list;
 1212         }
 1213 
 1214         /* If there's no prison to update, create a new one and link it in. */
 1215         if (pr == NULL) {
 1216                 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
 1217                         if (tpr->pr_childcount >= tpr->pr_childmax) {
 1218                                 error = EPERM;
 1219                                 vfs_opterror(opts, "prison limit exceeded");
 1220                                 goto done_unlock_list;
 1221                         }
 1222                 created = 1;
 1223                 mtx_lock(&ppr->pr_mtx);
 1224                 if (ppr->pr_ref == 0) {
 1225                         mtx_unlock(&ppr->pr_mtx);
 1226                         error = ENOENT;
 1227                         vfs_opterror(opts, "jail \"%s\" not found",
 1228                             prison_name(mypr, ppr));
 1229                         goto done_unlock_list;
 1230                 }
 1231                 ppr->pr_ref++;
 1232                 ppr->pr_uref++;
 1233                 mtx_unlock(&ppr->pr_mtx);
 1234                 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
 1235                 if (jid == 0) {
 1236                         /* Find the next free jid. */
 1237                         jid = lastprid + 1;
 1238  findnext:
 1239                         if (jid == JAIL_MAX)
 1240                                 jid = 1;
 1241                         TAILQ_FOREACH(tpr, &allprison, pr_list) {
 1242                                 if (tpr->pr_id < jid)
 1243                                         continue;
 1244                                 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
 1245                                         TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
 1246                                         break;
 1247                                 }
 1248                                 if (jid == lastprid) {
 1249                                         error = EAGAIN;
 1250                                         vfs_opterror(opts,
 1251                                             "no available jail IDs");
 1252                                         free(pr, M_PRISON);
 1253                                         prison_deref(ppr, PD_DEREF |
 1254                                             PD_DEUREF | PD_LIST_XLOCKED);
 1255                                         goto done_releroot;
 1256                                 }
 1257                                 jid++;
 1258                                 goto findnext;
 1259                         }
 1260                         lastprid = jid;
 1261                 } else {
 1262                         /*
 1263                          * The jail already has a jid (that did not yet exist),
 1264                          * so just find where to insert it.
 1265                          */
 1266                         TAILQ_FOREACH(tpr, &allprison, pr_list)
 1267                                 if (tpr->pr_id >= jid) {
 1268                                         TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
 1269                                         break;
 1270                                 }
 1271                 }
 1272                 if (tpr == NULL)
 1273                         TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
 1274                 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
 1275                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 1276                         tpr->pr_childcount++;
 1277 
 1278                 pr->pr_parent = ppr;
 1279                 pr->pr_id = jid;
 1280 
 1281                 /* Set some default values, and inherit some from the parent. */
 1282                 if (namelc == NULL)
 1283                         namelc = "";
 1284                 if (path == NULL) {
 1285                         path = "/";
 1286                         root = mypr->pr_root;
 1287                         vref(root);
 1288                 }
 1289                 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
 1290                 pr->pr_flags |= PR_HOST;
 1291 #if defined(INET) || defined(INET6)
 1292 #ifdef VIMAGE
 1293                 if (!(pr_flags & PR_VNET))
 1294 #endif
 1295                 {
 1296 #ifdef INET
 1297                         if (!(ch_flags & PR_IP4_USER))
 1298                                 pr->pr_flags |=
 1299                                     PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
 1300                         else if (!(pr_flags & PR_IP4_USER)) {
 1301                                 pr->pr_flags |= ppr->pr_flags & PR_IP4;
 1302                                 if (ppr->pr_ip4 != NULL) {
 1303                                         pr->pr_ip4s = ppr->pr_ip4s;
 1304                                         pr->pr_ip4 = malloc(pr->pr_ip4s *
 1305                                             sizeof(struct in_addr), M_PRISON,
 1306                                             M_WAITOK);
 1307                                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 1308                                             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 1309                                 }
 1310                         }
 1311 #endif
 1312 #ifdef INET6
 1313                         if (!(ch_flags & PR_IP6_USER))
 1314                                 pr->pr_flags |=
 1315                                     PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
 1316                         else if (!(pr_flags & PR_IP6_USER)) {
 1317                                 pr->pr_flags |= ppr->pr_flags & PR_IP6;
 1318                                 if (ppr->pr_ip6 != NULL) {
 1319                                         pr->pr_ip6s = ppr->pr_ip6s;
 1320                                         pr->pr_ip6 = malloc(pr->pr_ip6s *
 1321                                             sizeof(struct in6_addr), M_PRISON,
 1322                                             M_WAITOK);
 1323                                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 1324                                             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 1325                                 }
 1326                         }
 1327 #endif
 1328                 }
 1329 #endif
 1330                 /* Source address selection is always on by default. */
 1331                 pr->pr_flags |= _PR_IP_SADDRSEL;
 1332 
 1333                 pr->pr_securelevel = ppr->pr_securelevel;
 1334                 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
 1335                 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
 1336                 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
 1337 
 1338                 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
 1339                 if (osrelstr == NULL)
 1340                     strcpy(pr->pr_osrelease, ppr->pr_osrelease);
 1341                 else
 1342                     strcpy(pr->pr_osrelease, osrelstr);
 1343 
 1344                 LIST_INIT(&pr->pr_children);
 1345                 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
 1346                 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
 1347 
 1348 #ifdef VIMAGE
 1349                 /* Allocate a new vnet if specified. */
 1350                 pr->pr_vnet = (pr_flags & PR_VNET)
 1351                     ? vnet_alloc() : ppr->pr_vnet;
 1352 #endif
 1353                 /*
 1354                  * Allocate a dedicated cpuset for each jail.
 1355                  * Unlike other initial settings, this may return an erorr.
 1356                  */
 1357                 error = cpuset_create_root(ppr, &pr->pr_cpuset);
 1358                 if (error) {
 1359                         prison_deref(pr, PD_LIST_XLOCKED);
 1360                         goto done_releroot;
 1361                 }
 1362 
 1363                 mtx_lock(&pr->pr_mtx);
 1364                 /*
 1365                  * New prisons do not yet have a reference, because we do not
 1366                  * want others to see the incomplete prison once the
 1367                  * allprison_lock is downgraded.
 1368                  */
 1369         } else {
 1370                 created = 0;
 1371                 /*
 1372                  * Grab a reference for existing prisons, to ensure they
 1373                  * continue to exist for the duration of the call.
 1374                  */
 1375                 pr->pr_ref++;
 1376 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
 1377                 if ((pr->pr_flags & PR_VNET) &&
 1378                     (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
 1379                         error = EINVAL;
 1380                         vfs_opterror(opts,
 1381                             "vnet jails cannot have IP address restrictions");
 1382                         goto done_deref_locked;
 1383                 }
 1384 #endif
 1385 #ifdef INET
 1386                 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
 1387                         error = EINVAL;
 1388                         vfs_opterror(opts,
 1389                             "ip4 cannot be changed after creation");
 1390                         goto done_deref_locked;
 1391                 }
 1392 #endif
 1393 #ifdef INET6
 1394                 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
 1395                         error = EINVAL;
 1396                         vfs_opterror(opts,
 1397                             "ip6 cannot be changed after creation");
 1398                         goto done_deref_locked;
 1399                 }
 1400 #endif
 1401         }
 1402 
 1403         /* Do final error checking before setting anything. */
 1404         if (gotslevel) {
 1405                 if (slevel < ppr->pr_securelevel) {
 1406                         error = EPERM;
 1407                         goto done_deref_locked;
 1408                 }
 1409         }
 1410         if (gotchildmax) {
 1411                 if (childmax >= ppr->pr_childmax) {
 1412                         error = EPERM;
 1413                         goto done_deref_locked;
 1414                 }
 1415         }
 1416         if (gotenforce) {
 1417                 if (enforce < ppr->pr_enforce_statfs) {
 1418                         error = EPERM;
 1419                         goto done_deref_locked;
 1420                 }
 1421         }
 1422         if (gotrsnum) {
 1423                 /*
 1424                  * devfs_rsnum is a uint16_t
 1425                  */
 1426                 if (rsnum < 0 || rsnum > 65535) {
 1427                         error = EINVAL;
 1428                         goto done_deref_locked;
 1429                 }
 1430                 /*
 1431                  * Nested jails always inherit parent's devfs ruleset
 1432                  */
 1433                 if (jailed(td->td_ucred)) {
 1434                         if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
 1435                                 error = EPERM;
 1436                                 goto done_deref_locked;
 1437                         } else
 1438                                 rsnum = ppr->pr_devfs_rsnum;
 1439                 }
 1440         }
 1441 #ifdef INET
 1442         if (ip4s > 0) {
 1443                 if (ppr->pr_flags & PR_IP4) {
 1444                         /*
 1445                          * Make sure the new set of IP addresses is a
 1446                          * subset of the parent's list.  Don't worry
 1447                          * about the parent being unlocked, as any
 1448                          * setting is done with allprison_lock held.
 1449                          */
 1450                         for (ij = 0; ij < ppr->pr_ip4s; ij++)
 1451                                 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 1452                                         break;
 1453                         if (ij == ppr->pr_ip4s) {
 1454                                 error = EPERM;
 1455                                 goto done_deref_locked;
 1456                         }
 1457                         if (ip4s > 1) {
 1458                                 for (ii = ij = 1; ii < ip4s; ii++) {
 1459                                         if (ip4[ii].s_addr ==
 1460                                             ppr->pr_ip4[0].s_addr)
 1461                                                 continue;
 1462                                         for (; ij < ppr->pr_ip4s; ij++)
 1463                                                 if (ip4[ii].s_addr ==
 1464                                                     ppr->pr_ip4[ij].s_addr)
 1465                                                         break;
 1466                                         if (ij == ppr->pr_ip4s)
 1467                                                 break;
 1468                                 }
 1469                                 if (ij == ppr->pr_ip4s) {
 1470                                         error = EPERM;
 1471                                         goto done_deref_locked;
 1472                                 }
 1473                         }
 1474                 }
 1475                 /*
 1476                  * Check for conflicting IP addresses.  We permit them
 1477                  * if there is no more than one IP on each jail.  If
 1478                  * there is a duplicate on a jail with more than one
 1479                  * IP stop checking and return error.
 1480                  */
 1481 #ifdef VIMAGE
 1482                 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
 1483                         if (tppr->pr_flags & PR_VNET)
 1484                                 break;
 1485 #else
 1486                 tppr = &prison0;
 1487 #endif
 1488                 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
 1489                         if (tpr == pr ||
 1490 #ifdef VIMAGE
 1491                             (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
 1492 #endif
 1493                             tpr->pr_uref == 0) {
 1494                                 descend = 0;
 1495                                 continue;
 1496                         }
 1497                         if (!(tpr->pr_flags & PR_IP4_USER))
 1498                                 continue;
 1499                         descend = 0;
 1500                         if (tpr->pr_ip4 == NULL ||
 1501                             (ip4s == 1 && tpr->pr_ip4s == 1))
 1502                                 continue;
 1503                         for (ii = 0; ii < ip4s; ii++) {
 1504                                 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
 1505                                         error = EADDRINUSE;
 1506                                         vfs_opterror(opts,
 1507                                             "IPv4 addresses clash");
 1508                                         goto done_deref_locked;
 1509                                 }
 1510                         }
 1511                 }
 1512         }
 1513 #endif
 1514 #ifdef INET6
 1515         if (ip6s > 0) {
 1516                 if (ppr->pr_flags & PR_IP6) {
 1517                         /*
 1518                          * Make sure the new set of IP addresses is a
 1519                          * subset of the parent's list.
 1520                          */
 1521                         for (ij = 0; ij < ppr->pr_ip6s; ij++)
 1522                                 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
 1523                                     &ppr->pr_ip6[ij]))
 1524                                         break;
 1525                         if (ij == ppr->pr_ip6s) {
 1526                                 error = EPERM;
 1527                                 goto done_deref_locked;
 1528                         }
 1529                         if (ip6s > 1) {
 1530                                 for (ii = ij = 1; ii < ip6s; ii++) {
 1531                                         if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
 1532                                              &ppr->pr_ip6[0]))
 1533                                                 continue;
 1534                                         for (; ij < ppr->pr_ip6s; ij++)
 1535                                                 if (IN6_ARE_ADDR_EQUAL(
 1536                                                     &ip6[ii], &ppr->pr_ip6[ij]))
 1537                                                         break;
 1538                                         if (ij == ppr->pr_ip6s)
 1539                                                 break;
 1540                                 }
 1541                                 if (ij == ppr->pr_ip6s) {
 1542                                         error = EPERM;
 1543                                         goto done_deref_locked;
 1544                                 }
 1545                         }
 1546                 }
 1547                 /* Check for conflicting IP addresses. */
 1548 #ifdef VIMAGE
 1549                 for (tppr = ppr; tppr != &prison0; tppr = tppr->pr_parent)
 1550                         if (tppr->pr_flags & PR_VNET)
 1551                                 break;
 1552 #else
 1553                 tppr = &prison0;
 1554 #endif
 1555                 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
 1556                         if (tpr == pr ||
 1557 #ifdef VIMAGE
 1558                             (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
 1559 #endif
 1560                             tpr->pr_uref == 0) {
 1561                                 descend = 0;
 1562                                 continue;
 1563                         }
 1564                         if (!(tpr->pr_flags & PR_IP6_USER))
 1565                                 continue;
 1566                         descend = 0;
 1567                         if (tpr->pr_ip6 == NULL ||
 1568                             (ip6s == 1 && tpr->pr_ip6s == 1))
 1569                                 continue;
 1570                         for (ii = 0; ii < ip6s; ii++) {
 1571                                 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
 1572                                         error = EADDRINUSE;
 1573                                         vfs_opterror(opts,
 1574                                             "IPv6 addresses clash");
 1575                                         goto done_deref_locked;
 1576                                 }
 1577                         }
 1578                 }
 1579         }
 1580 #endif
 1581         onamelen = namelen = 0;
 1582         if (namelc != NULL) {
 1583                 /* Give a default name of the jid.  Also allow the name to be
 1584                  * explicitly the jid - but not any other number, and only in
 1585                  * normal form (no leading zero/etc).
 1586                  */
 1587                 if (namelc[0] == '\0')
 1588                         snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
 1589                 else if ((strtoul(namelc, &p, 10) != jid ||
 1590                           namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
 1591                         error = EINVAL;
 1592                         vfs_opterror(opts,
 1593                             "name cannot be numeric (unless it is the jid)");
 1594                         goto done_deref_locked;
 1595                 }
 1596                 /*
 1597                  * Make sure the name isn't too long for the prison or its
 1598                  * children.
 1599                  */
 1600                 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
 1601                 onamelen = strlen(pr->pr_name + pnamelen);
 1602                 namelen = strlen(namelc);
 1603                 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
 1604                         error = ENAMETOOLONG;
 1605                         goto done_deref_locked;
 1606                 }
 1607                 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
 1608                         if (strlen(tpr->pr_name) + (namelen - onamelen) >=
 1609                             sizeof(pr->pr_name)) {
 1610                                 error = ENAMETOOLONG;
 1611                                 goto done_deref_locked;
 1612                         }
 1613                 }
 1614         }
 1615         if (pr_allow & ~ppr->pr_allow) {
 1616                 error = EPERM;
 1617                 goto done_deref_locked;
 1618         }
 1619 
 1620         /*
 1621          * Let modules check their parameters.  This requires unlocking and
 1622          * then re-locking the prison, but this is still a valid state as long
 1623          * as allprison_lock remains xlocked.
 1624          */
 1625         mtx_unlock(&pr->pr_mtx);
 1626         error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
 1627         if (error != 0) {
 1628                 prison_deref(pr, created
 1629                     ? PD_LIST_XLOCKED
 1630                     : PD_DEREF | PD_LIST_XLOCKED);
 1631                 goto done_releroot;
 1632         }
 1633         mtx_lock(&pr->pr_mtx);
 1634 
 1635         /* At this point, all valid parameters should have been noted. */
 1636         TAILQ_FOREACH(opt, opts, link) {
 1637                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
 1638                         error = EINVAL;
 1639                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
 1640                         goto done_deref_locked;
 1641                 }
 1642         }
 1643 
 1644         /* Set the parameters of the prison. */
 1645 #ifdef INET
 1646         redo_ip4 = 0;
 1647         if (pr_flags & PR_IP4_USER) {
 1648                 pr->pr_flags |= PR_IP4;
 1649                 free(pr->pr_ip4, M_PRISON);
 1650                 pr->pr_ip4s = ip4s;
 1651                 pr->pr_ip4 = ip4;
 1652                 ip4 = NULL;
 1653                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1654 #ifdef VIMAGE
 1655                         if (tpr->pr_flags & PR_VNET) {
 1656                                 descend = 0;
 1657                                 continue;
 1658                         }
 1659 #endif
 1660                         if (prison_restrict_ip4(tpr, NULL)) {
 1661                                 redo_ip4 = 1;
 1662                                 descend = 0;
 1663                         }
 1664                 }
 1665         }
 1666 #endif
 1667 #ifdef INET6
 1668         redo_ip6 = 0;
 1669         if (pr_flags & PR_IP6_USER) {
 1670                 pr->pr_flags |= PR_IP6;
 1671                 free(pr->pr_ip6, M_PRISON);
 1672                 pr->pr_ip6s = ip6s;
 1673                 pr->pr_ip6 = ip6;
 1674                 ip6 = NULL;
 1675                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1676 #ifdef VIMAGE
 1677                         if (tpr->pr_flags & PR_VNET) {
 1678                                 descend = 0;
 1679                                 continue;
 1680                         }
 1681 #endif
 1682                         if (prison_restrict_ip6(tpr, NULL)) {
 1683                                 redo_ip6 = 1;
 1684                                 descend = 0;
 1685                         }
 1686                 }
 1687         }
 1688 #endif
 1689         if (gotslevel) {
 1690                 pr->pr_securelevel = slevel;
 1691                 /* Set all child jails to be at least this level. */
 1692                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1693                         if (tpr->pr_securelevel < slevel)
 1694                                 tpr->pr_securelevel = slevel;
 1695         }
 1696         if (gotchildmax) {
 1697                 pr->pr_childmax = childmax;
 1698                 /* Set all child jails to under this limit. */
 1699                 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
 1700                         if (tpr->pr_childmax > childmax - level)
 1701                                 tpr->pr_childmax = childmax > level
 1702                                     ? childmax - level : 0;
 1703         }
 1704         if (gotenforce) {
 1705                 pr->pr_enforce_statfs = enforce;
 1706                 /* Pass this restriction on to the children. */
 1707                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1708                         if (tpr->pr_enforce_statfs < enforce)
 1709                                 tpr->pr_enforce_statfs = enforce;
 1710         }
 1711         if (gotrsnum) {
 1712                 pr->pr_devfs_rsnum = rsnum;
 1713                 /* Pass this restriction on to the children. */
 1714                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1715                         tpr->pr_devfs_rsnum = rsnum;
 1716         }
 1717         if (namelc != NULL) {
 1718                 if (ppr == &prison0)
 1719                         strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
 1720                 else
 1721                         snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
 1722                             ppr->pr_name, namelc);
 1723                 /* Change this component of child names. */
 1724                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1725                         bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
 1726                             strlen(tpr->pr_name + onamelen) + 1);
 1727                         bcopy(pr->pr_name, tpr->pr_name, namelen);
 1728                 }
 1729         }
 1730         if (path != NULL) {
 1731                 /* Try to keep a real-rooted full pathname. */
 1732                 if (fullpath_disabled && path[0] == '/' &&
 1733                     strcmp(mypr->pr_path, "/"))
 1734                         snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
 1735                             mypr->pr_path, path);
 1736                 else
 1737                         strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
 1738                 pr->pr_root = root;
 1739         }
 1740         if (PR_HOST & ch_flags & ~pr_flags) {
 1741                 if (pr->pr_flags & PR_HOST) {
 1742                         /*
 1743                          * Copy the parent's host info.  As with pr_ip4 above,
 1744                          * the lack of a lock on the parent is not a problem;
 1745                          * it is always set with allprison_lock at least
 1746                          * shared, and is held exclusively here.
 1747                          */
 1748                         strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
 1749                             sizeof(pr->pr_hostname));
 1750                         strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
 1751                             sizeof(pr->pr_domainname));
 1752                         strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
 1753                             sizeof(pr->pr_hostuuid));
 1754                         pr->pr_hostid = pr->pr_parent->pr_hostid;
 1755                 }
 1756         } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
 1757                 /* Set this prison, and any descendants without PR_HOST. */
 1758                 if (host != NULL)
 1759                         strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
 1760                 if (domain != NULL)
 1761                         strlcpy(pr->pr_domainname, domain, 
 1762                             sizeof(pr->pr_domainname));
 1763                 if (uuid != NULL)
 1764                         strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
 1765                 if (gothid)
 1766                         pr->pr_hostid = hid;
 1767                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1768                         if (tpr->pr_flags & PR_HOST)
 1769                                 descend = 0;
 1770                         else {
 1771                                 if (host != NULL)
 1772                                         strlcpy(tpr->pr_hostname,
 1773                                             pr->pr_hostname,
 1774                                             sizeof(tpr->pr_hostname));
 1775                                 if (domain != NULL)
 1776                                         strlcpy(tpr->pr_domainname, 
 1777                                             pr->pr_domainname,
 1778                                             sizeof(tpr->pr_domainname));
 1779                                 if (uuid != NULL)
 1780                                         strlcpy(tpr->pr_hostuuid,
 1781                                             pr->pr_hostuuid,
 1782                                             sizeof(tpr->pr_hostuuid));
 1783                                 if (gothid)
 1784                                         tpr->pr_hostid = hid;
 1785                         }
 1786                 }
 1787         }
 1788         if ((tallow = ch_allow & ~pr_allow)) {
 1789                 /* Clear allow bits in all children. */
 1790                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1791                         tpr->pr_allow &= ~tallow;
 1792         }
 1793         pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
 1794         /*
 1795          * Persistent prisons get an extra reference, and prisons losing their
 1796          * persist flag lose that reference.  Only do this for existing prisons
 1797          * for now, so new ones will remain unseen until after the module
 1798          * handlers have completed.
 1799          */
 1800         born = pr->pr_uref == 0;
 1801         if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
 1802                 if (pr_flags & PR_PERSIST) {
 1803                         pr->pr_ref++;
 1804                         pr->pr_uref++;
 1805                 } else {
 1806                         pr->pr_ref--;
 1807                         pr->pr_uref--;
 1808                 }
 1809         }
 1810         pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
 1811         mtx_unlock(&pr->pr_mtx);
 1812 
 1813 #ifdef RACCT
 1814         if (racct_enable && created)
 1815                 prison_racct_attach(pr);
 1816 #endif
 1817 
 1818         /* Locks may have prevented a complete restriction of child IP
 1819          * addresses.  If so, allocate some more memory and try again.
 1820          */
 1821 #ifdef INET
 1822         while (redo_ip4) {
 1823                 ip4s = pr->pr_ip4s;
 1824                 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
 1825                 mtx_lock(&pr->pr_mtx);
 1826                 redo_ip4 = 0;
 1827                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1828 #ifdef VIMAGE
 1829                         if (tpr->pr_flags & PR_VNET) {
 1830                                 descend = 0;
 1831                                 continue;
 1832                         }
 1833 #endif
 1834                         if (prison_restrict_ip4(tpr, ip4)) {
 1835                                 if (ip4 != NULL)
 1836                                         ip4 = NULL;
 1837                                 else
 1838                                         redo_ip4 = 1;
 1839                         }
 1840                 }
 1841                 mtx_unlock(&pr->pr_mtx);
 1842         }
 1843 #endif
 1844 #ifdef INET6
 1845         while (redo_ip6) {
 1846                 ip6s = pr->pr_ip6s;
 1847                 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
 1848                 mtx_lock(&pr->pr_mtx);
 1849                 redo_ip6 = 0;
 1850                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1851 #ifdef VIMAGE
 1852                         if (tpr->pr_flags & PR_VNET) {
 1853                                 descend = 0;
 1854                                 continue;
 1855                         }
 1856 #endif
 1857                         if (prison_restrict_ip6(tpr, ip6)) {
 1858                                 if (ip6 != NULL)
 1859                                         ip6 = NULL;
 1860                                 else
 1861                                         redo_ip6 = 1;
 1862                         }
 1863                 }
 1864                 mtx_unlock(&pr->pr_mtx);
 1865         }
 1866 #endif
 1867 
 1868         /* Let the modules do their work. */
 1869         sx_downgrade(&allprison_lock);
 1870         if (born) {
 1871                 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
 1872                 if (error) {
 1873                         (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
 1874                         prison_deref(pr, created
 1875                             ? PD_LIST_SLOCKED
 1876                             : PD_DEREF | PD_LIST_SLOCKED);
 1877                         goto done_errmsg;
 1878                 }
 1879         }
 1880         error = osd_jail_call(pr, PR_METHOD_SET, opts);
 1881         if (error) {
 1882                 if (born)
 1883                         (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
 1884                 prison_deref(pr, created
 1885                     ? PD_LIST_SLOCKED
 1886                     : PD_DEREF | PD_LIST_SLOCKED);
 1887                 goto done_errmsg;
 1888         }
 1889 
 1890         /* Attach this process to the prison if requested. */
 1891         if (flags & JAIL_ATTACH) {
 1892                 mtx_lock(&pr->pr_mtx);
 1893                 error = do_jail_attach(td, pr);
 1894                 if (error) {
 1895                         vfs_opterror(opts, "attach failed");
 1896                         if (!created)
 1897                                 prison_deref(pr, PD_DEREF);
 1898                         goto done_errmsg;
 1899                 }
 1900         }
 1901 
 1902 #ifdef RACCT
 1903         if (racct_enable && !created) {
 1904                 if (!(flags & JAIL_ATTACH))
 1905                         sx_sunlock(&allprison_lock);
 1906                 prison_racct_modify(pr);
 1907                 if (!(flags & JAIL_ATTACH))
 1908                         sx_slock(&allprison_lock);
 1909         }
 1910 #endif
 1911 
 1912         td->td_retval[0] = pr->pr_id;
 1913 
 1914         /*
 1915          * Now that it is all there, drop the temporary reference from existing
 1916          * prisons.  Or add a reference to newly created persistent prisons
 1917          * (which was not done earlier so that the prison would not be publicly
 1918          * visible).
 1919          */
 1920         if (!created) {
 1921                 prison_deref(pr, (flags & JAIL_ATTACH)
 1922                     ? PD_DEREF
 1923                     : PD_DEREF | PD_LIST_SLOCKED);
 1924         } else {
 1925                 if (pr_flags & PR_PERSIST) {
 1926                         mtx_lock(&pr->pr_mtx);
 1927                         pr->pr_ref++;
 1928                         pr->pr_uref++;
 1929                         mtx_unlock(&pr->pr_mtx);
 1930                 }
 1931                 if (!(flags & JAIL_ATTACH))
 1932                         sx_sunlock(&allprison_lock);
 1933         }
 1934 
 1935         goto done_free;
 1936 
 1937  done_deref_locked:
 1938         prison_deref(pr, created
 1939             ? PD_LOCKED | PD_LIST_XLOCKED
 1940             : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 1941         goto done_releroot;
 1942  done_unlock_list:
 1943         sx_xunlock(&allprison_lock);
 1944  done_releroot:
 1945         if (root != NULL)
 1946                 vrele(root);
 1947  done_errmsg:
 1948         if (error) {
 1949                 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
 1950                     &errmsg_len) == 0 && errmsg_len > 0) {
 1951                         errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
 1952                         if (optuio->uio_segflg == UIO_SYSSPACE)
 1953                                 bcopy(errmsg,
 1954                                     optuio->uio_iov[errmsg_pos].iov_base,
 1955                                     errmsg_len);
 1956                         else
 1957                                 copyout(errmsg,
 1958                                     optuio->uio_iov[errmsg_pos].iov_base,
 1959                                     errmsg_len);
 1960                 }
 1961         }
 1962  done_free:
 1963 #ifdef INET
 1964         free(ip4, M_PRISON);
 1965 #endif
 1966 #ifdef INET6
 1967         free(ip6, M_PRISON);
 1968 #endif
 1969         if (g_path != NULL)
 1970                 free(g_path, M_TEMP);
 1971         vfs_freeopts(opts);
 1972         return (error);
 1973 }
 1974 
 1975 
 1976 /*
 1977  * struct jail_get_args {
 1978  *      struct iovec *iovp;
 1979  *      unsigned int iovcnt;
 1980  *      int flags;
 1981  * };
 1982  */
 1983 int
 1984 sys_jail_get(struct thread *td, struct jail_get_args *uap)
 1985 {
 1986         struct uio *auio;
 1987         int error;
 1988 
 1989         /* Check that we have an even number of iovecs. */
 1990         if (uap->iovcnt & 1)
 1991                 return (EINVAL);
 1992 
 1993         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
 1994         if (error)
 1995                 return (error);
 1996         error = kern_jail_get(td, auio, uap->flags);
 1997         if (error == 0)
 1998                 error = copyout(auio->uio_iov, uap->iovp,
 1999                     uap->iovcnt * sizeof (struct iovec));
 2000         free(auio, M_IOV);
 2001         return (error);
 2002 }
 2003 
 2004 int
 2005 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
 2006 {
 2007         struct prison *pr, *mypr;
 2008         struct vfsopt *opt;
 2009         struct vfsoptlist *opts;
 2010         char *errmsg, *name;
 2011         int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
 2012 
 2013         if (flags & ~JAIL_GET_MASK)
 2014                 return (EINVAL);
 2015 
 2016         /* Get the parameter list. */
 2017         error = vfs_buildopts(optuio, &opts);
 2018         if (error)
 2019                 return (error);
 2020         errmsg_pos = vfs_getopt_pos(opts, "errmsg");
 2021         mypr = td->td_ucred->cr_prison;
 2022 
 2023         /*
 2024          * Find the prison specified by one of: lastjid, jid, name.
 2025          */
 2026         sx_slock(&allprison_lock);
 2027         error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
 2028         if (error == 0) {
 2029                 TAILQ_FOREACH(pr, &allprison, pr_list) {
 2030                         if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
 2031                                 mtx_lock(&pr->pr_mtx);
 2032                                 if (pr->pr_ref > 0 &&
 2033                                     (pr->pr_uref > 0 || (flags & JAIL_DYING)))
 2034                                         break;
 2035                                 mtx_unlock(&pr->pr_mtx);
 2036                         }
 2037                 }
 2038                 if (pr != NULL)
 2039                         goto found_prison;
 2040                 error = ENOENT;
 2041                 vfs_opterror(opts, "no jail after %d", jid);
 2042                 goto done_unlock_list;
 2043         } else if (error != ENOENT)
 2044                 goto done_unlock_list;
 2045 
 2046         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
 2047         if (error == 0) {
 2048                 if (jid != 0) {
 2049                         pr = prison_find_child(mypr, jid);
 2050                         if (pr != NULL) {
 2051                                 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 2052                                         mtx_unlock(&pr->pr_mtx);
 2053                                         error = ENOENT;
 2054                                         vfs_opterror(opts, "jail %d is dying",
 2055                                             jid);
 2056                                         goto done_unlock_list;
 2057                                 }
 2058                                 goto found_prison;
 2059                         }
 2060                         error = ENOENT;
 2061                         vfs_opterror(opts, "jail %d not found", jid);
 2062                         goto done_unlock_list;
 2063                 }
 2064         } else if (error != ENOENT)
 2065                 goto done_unlock_list;
 2066 
 2067         error = vfs_getopt(opts, "name", (void **)&name, &len);
 2068         if (error == 0) {
 2069                 if (len == 0 || name[len - 1] != '\0') {
 2070                         error = EINVAL;
 2071                         goto done_unlock_list;
 2072                 }
 2073                 pr = prison_find_name(mypr, name);
 2074                 if (pr != NULL) {
 2075                         if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 2076                                 mtx_unlock(&pr->pr_mtx);
 2077                                 error = ENOENT;
 2078                                 vfs_opterror(opts, "jail \"%s\" is dying",
 2079                                     name);
 2080                                 goto done_unlock_list;
 2081                         }
 2082                         goto found_prison;
 2083                 }
 2084                 error = ENOENT;
 2085                 vfs_opterror(opts, "jail \"%s\" not found", name);
 2086                 goto done_unlock_list;
 2087         } else if (error != ENOENT)
 2088                 goto done_unlock_list;
 2089 
 2090         vfs_opterror(opts, "no jail specified");
 2091         error = ENOENT;
 2092         goto done_unlock_list;
 2093 
 2094  found_prison:
 2095         /* Get the parameters of the prison. */
 2096         pr->pr_ref++;
 2097         locked = PD_LOCKED;
 2098         td->td_retval[0] = pr->pr_id;
 2099         error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
 2100         if (error != 0 && error != ENOENT)
 2101                 goto done_deref;
 2102         i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
 2103         error = vfs_setopt(opts, "parent", &i, sizeof(i));
 2104         if (error != 0 && error != ENOENT)
 2105                 goto done_deref;
 2106         error = vfs_setopts(opts, "name", prison_name(mypr, pr));
 2107         if (error != 0 && error != ENOENT)
 2108                 goto done_deref;
 2109         error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
 2110             sizeof(pr->pr_cpuset->cs_id));
 2111         if (error != 0 && error != ENOENT)
 2112                 goto done_deref;
 2113         error = vfs_setopts(opts, "path", prison_path(mypr, pr));
 2114         if (error != 0 && error != ENOENT)
 2115                 goto done_deref;
 2116 #ifdef INET
 2117         error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
 2118             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2119         if (error != 0 && error != ENOENT)
 2120                 goto done_deref;
 2121 #endif
 2122 #ifdef INET6
 2123         error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
 2124             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 2125         if (error != 0 && error != ENOENT)
 2126                 goto done_deref;
 2127 #endif
 2128         error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
 2129             sizeof(pr->pr_securelevel));
 2130         if (error != 0 && error != ENOENT)
 2131                 goto done_deref;
 2132         error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
 2133             sizeof(pr->pr_childcount));
 2134         if (error != 0 && error != ENOENT)
 2135                 goto done_deref;
 2136         error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
 2137             sizeof(pr->pr_childmax));
 2138         if (error != 0 && error != ENOENT)
 2139                 goto done_deref;
 2140         error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
 2141         if (error != 0 && error != ENOENT)
 2142                 goto done_deref;
 2143         error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
 2144         if (error != 0 && error != ENOENT)
 2145                 goto done_deref;
 2146         error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
 2147         if (error != 0 && error != ENOENT)
 2148                 goto done_deref;
 2149 #ifdef COMPAT_FREEBSD32
 2150         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
 2151                 uint32_t hid32 = pr->pr_hostid;
 2152 
 2153                 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
 2154         } else
 2155 #endif
 2156         error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
 2157             sizeof(pr->pr_hostid));
 2158         if (error != 0 && error != ENOENT)
 2159                 goto done_deref;
 2160         error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
 2161             sizeof(pr->pr_enforce_statfs));
 2162         if (error != 0 && error != ENOENT)
 2163                 goto done_deref;
 2164         error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
 2165             sizeof(pr->pr_devfs_rsnum));
 2166         if (error != 0 && error != ENOENT)
 2167                 goto done_deref;
 2168         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 2169             fi++) {
 2170                 if (pr_flag_names[fi] == NULL)
 2171                         continue;
 2172                 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
 2173                 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
 2174                 if (error != 0 && error != ENOENT)
 2175                         goto done_deref;
 2176                 i = !i;
 2177                 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
 2178                 if (error != 0 && error != ENOENT)
 2179                         goto done_deref;
 2180         }
 2181         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 2182             fi++) {
 2183                 i = pr->pr_flags &
 2184                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 2185                 i = pr_flag_jailsys[fi].disable &&
 2186                       (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
 2187                     : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
 2188                     : JAIL_SYS_INHERIT;
 2189                 error =
 2190                     vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
 2191                 if (error != 0 && error != ENOENT)
 2192                         goto done_deref;
 2193         }
 2194         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 2195             fi++) {
 2196                 if (pr_allow_names[fi] == NULL)
 2197                         continue;
 2198                 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
 2199                 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
 2200                 if (error != 0 && error != ENOENT)
 2201                         goto done_deref;
 2202                 i = !i;
 2203                 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
 2204                 if (error != 0 && error != ENOENT)
 2205                         goto done_deref;
 2206         }
 2207         i = (pr->pr_uref == 0);
 2208         error = vfs_setopt(opts, "dying", &i, sizeof(i));
 2209         if (error != 0 && error != ENOENT)
 2210                 goto done_deref;
 2211         i = !i;
 2212         error = vfs_setopt(opts, "nodying", &i, sizeof(i));
 2213         if (error != 0 && error != ENOENT)
 2214                 goto done_deref;
 2215         error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
 2216             sizeof(pr->pr_osreldate));
 2217         if (error != 0 && error != ENOENT)
 2218                 goto done_deref;
 2219         error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
 2220         if (error != 0 && error != ENOENT)
 2221                 goto done_deref;
 2222 
 2223         /* Get the module parameters. */
 2224         mtx_unlock(&pr->pr_mtx);
 2225         locked = 0;
 2226         error = osd_jail_call(pr, PR_METHOD_GET, opts);
 2227         if (error)
 2228                 goto done_deref;
 2229         prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
 2230 
 2231         /* By now, all parameters should have been noted. */
 2232         TAILQ_FOREACH(opt, opts, link) {
 2233                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
 2234                         error = EINVAL;
 2235                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
 2236                         goto done_errmsg;
 2237                 }
 2238         }
 2239 
 2240         /* Write the fetched parameters back to userspace. */
 2241         error = 0;
 2242         TAILQ_FOREACH(opt, opts, link) {
 2243                 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
 2244                         pos = 2 * opt->pos + 1;
 2245                         optuio->uio_iov[pos].iov_len = opt->len;
 2246                         if (opt->value != NULL) {
 2247                                 if (optuio->uio_segflg == UIO_SYSSPACE) {
 2248                                         bcopy(opt->value,
 2249                                             optuio->uio_iov[pos].iov_base,
 2250                                             opt->len);
 2251                                 } else {
 2252                                         error = copyout(opt->value,
 2253                                             optuio->uio_iov[pos].iov_base,
 2254                                             opt->len);
 2255                                         if (error)
 2256                                                 break;
 2257                                 }
 2258                         }
 2259                 }
 2260         }
 2261         goto done_errmsg;
 2262 
 2263  done_deref:
 2264         prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
 2265         goto done_errmsg;
 2266 
 2267  done_unlock_list:
 2268         sx_sunlock(&allprison_lock);
 2269  done_errmsg:
 2270         if (error && errmsg_pos >= 0) {
 2271                 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
 2272                 errmsg_pos = 2 * errmsg_pos + 1;
 2273                 if (errmsg_len > 0) {
 2274                         if (optuio->uio_segflg == UIO_SYSSPACE)
 2275                                 bcopy(errmsg,
 2276                                     optuio->uio_iov[errmsg_pos].iov_base,
 2277                                     errmsg_len);
 2278                         else
 2279                                 copyout(errmsg,
 2280                                     optuio->uio_iov[errmsg_pos].iov_base,
 2281                                     errmsg_len);
 2282                 }
 2283         }
 2284         vfs_freeopts(opts);
 2285         return (error);
 2286 }
 2287 
 2288 
 2289 /*
 2290  * struct jail_remove_args {
 2291  *      int jid;
 2292  * };
 2293  */
 2294 int
 2295 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
 2296 {
 2297         struct prison *pr, *cpr, *lpr, *tpr;
 2298         int descend, error;
 2299 
 2300         error = priv_check(td, PRIV_JAIL_REMOVE);
 2301         if (error)
 2302                 return (error);
 2303 
 2304         sx_xlock(&allprison_lock);
 2305         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2306         if (pr == NULL) {
 2307                 sx_xunlock(&allprison_lock);
 2308                 return (EINVAL);
 2309         }
 2310 
 2311         /* Remove all descendants of this prison, then remove this prison. */
 2312         pr->pr_ref++;
 2313         if (!LIST_EMPTY(&pr->pr_children)) {
 2314                 mtx_unlock(&pr->pr_mtx);
 2315                 lpr = NULL;
 2316                 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 2317                         mtx_lock(&cpr->pr_mtx);
 2318                         if (cpr->pr_ref > 0) {
 2319                                 tpr = cpr;
 2320                                 cpr->pr_ref++;
 2321                         } else {
 2322                                 /* Already removed - do not do it again. */
 2323                                 tpr = NULL;
 2324                         }
 2325                         mtx_unlock(&cpr->pr_mtx);
 2326                         if (lpr != NULL) {
 2327                                 mtx_lock(&lpr->pr_mtx);
 2328                                 prison_remove_one(lpr);
 2329                                 sx_xlock(&allprison_lock);
 2330                         }
 2331                         lpr = tpr;
 2332                 }
 2333                 if (lpr != NULL) {
 2334                         mtx_lock(&lpr->pr_mtx);
 2335                         prison_remove_one(lpr);
 2336                         sx_xlock(&allprison_lock);
 2337                 }
 2338                 mtx_lock(&pr->pr_mtx);
 2339         }
 2340         prison_remove_one(pr);
 2341         return (0);
 2342 }
 2343 
 2344 static void
 2345 prison_remove_one(struct prison *pr)
 2346 {
 2347         struct proc *p;
 2348         int deuref;
 2349 
 2350         /* If the prison was persistent, it is not anymore. */
 2351         deuref = 0;
 2352         if (pr->pr_flags & PR_PERSIST) {
 2353                 pr->pr_ref--;
 2354                 deuref = PD_DEUREF;
 2355                 pr->pr_flags &= ~PR_PERSIST;
 2356         }
 2357 
 2358         /*
 2359          * jail_remove added a reference.  If that's the only one, remove
 2360          * the prison now.
 2361          */
 2362         KASSERT(pr->pr_ref > 0,
 2363             ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
 2364         if (pr->pr_ref == 1) {
 2365                 prison_deref(pr,
 2366                     deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 2367                 return;
 2368         }
 2369 
 2370         mtx_unlock(&pr->pr_mtx);
 2371         sx_xunlock(&allprison_lock);
 2372         /*
 2373          * Kill all processes unfortunate enough to be attached to this prison.
 2374          */
 2375         sx_slock(&allproc_lock);
 2376         LIST_FOREACH(p, &allproc, p_list) {
 2377                 PROC_LOCK(p);
 2378                 if (p->p_state != PRS_NEW && p->p_ucred &&
 2379                     p->p_ucred->cr_prison == pr)
 2380                         kern_psignal(p, SIGKILL);
 2381                 PROC_UNLOCK(p);
 2382         }
 2383         sx_sunlock(&allproc_lock);
 2384         /* Remove the temporary reference added by jail_remove. */
 2385         prison_deref(pr, deuref | PD_DEREF);
 2386 }
 2387 
 2388 
 2389 /*
 2390  * struct jail_attach_args {
 2391  *      int jid;
 2392  * };
 2393  */
 2394 int
 2395 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
 2396 {
 2397         struct prison *pr;
 2398         int error;
 2399 
 2400         error = priv_check(td, PRIV_JAIL_ATTACH);
 2401         if (error)
 2402                 return (error);
 2403 
 2404         /*
 2405          * Start with exclusive hold on allprison_lock to ensure that a possible
 2406          * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove.
 2407          * But then immediately downgrade it since we don't need to stop
 2408          * readers.
 2409          */
 2410         sx_xlock(&allprison_lock);
 2411         sx_downgrade(&allprison_lock);
 2412         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2413         if (pr == NULL) {
 2414                 sx_sunlock(&allprison_lock);
 2415                 return (EINVAL);
 2416         }
 2417 
 2418         /*
 2419          * Do not allow a process to attach to a prison that is not
 2420          * considered to be "alive".
 2421          */
 2422         if (pr->pr_uref == 0) {
 2423                 mtx_unlock(&pr->pr_mtx);
 2424                 sx_sunlock(&allprison_lock);
 2425                 return (EINVAL);
 2426         }
 2427 
 2428         return (do_jail_attach(td, pr));
 2429 }
 2430 
 2431 static int
 2432 do_jail_attach(struct thread *td, struct prison *pr)
 2433 {
 2434         struct proc *p;
 2435         struct ucred *newcred, *oldcred;
 2436         int error;
 2437 
 2438         /*
 2439          * XXX: Note that there is a slight race here if two threads
 2440          * in the same privileged process attempt to attach to two
 2441          * different jails at the same time.  It is important for
 2442          * user processes not to do this, or they might end up with
 2443          * a process root from one prison, but attached to the jail
 2444          * of another.
 2445          */
 2446         pr->pr_ref++;
 2447         pr->pr_uref++;
 2448         mtx_unlock(&pr->pr_mtx);
 2449 
 2450         /* Let modules do whatever they need to prepare for attaching. */
 2451         error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
 2452         if (error) {
 2453                 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
 2454                 return (error);
 2455         }
 2456         sx_sunlock(&allprison_lock);
 2457 
 2458         /*
 2459          * Reparent the newly attached process to this jail.
 2460          */
 2461         p = td->td_proc;
 2462         error = cpuset_setproc_update_set(p, pr->pr_cpuset);
 2463         if (error)
 2464                 goto e_revert_osd;
 2465 
 2466         vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
 2467         if ((error = change_dir(pr->pr_root, td)) != 0)
 2468                 goto e_unlock;
 2469 #ifdef MAC
 2470         if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
 2471                 goto e_unlock;
 2472 #endif
 2473         VOP_UNLOCK(pr->pr_root, 0);
 2474         if ((error = change_root(pr->pr_root, td)))
 2475                 goto e_revert_osd;
 2476 
 2477         newcred = crget();
 2478         PROC_LOCK(p);
 2479         oldcred = crcopysafe(p, newcred);
 2480         newcred->cr_prison = pr;
 2481         proc_set_cred(p, newcred);
 2482         setsugid(p);
 2483         PROC_UNLOCK(p);
 2484 #ifdef RACCT
 2485         racct_proc_ucred_changed(p, oldcred, newcred);
 2486 #endif
 2487         prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
 2488         crfree(oldcred);
 2489         return (0);
 2490 
 2491  e_unlock:
 2492         VOP_UNLOCK(pr->pr_root, 0);
 2493  e_revert_osd:
 2494         /* Tell modules this thread is still in its old jail after all. */
 2495         (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
 2496         prison_deref(pr, PD_DEREF | PD_DEUREF);
 2497         return (error);
 2498 }
 2499 
 2500 
 2501 /*
 2502  * Returns a locked prison instance, or NULL on failure.
 2503  */
 2504 struct prison *
 2505 prison_find(int prid)
 2506 {
 2507         struct prison *pr;
 2508 
 2509         sx_assert(&allprison_lock, SX_LOCKED);
 2510         TAILQ_FOREACH(pr, &allprison, pr_list) {
 2511                 if (pr->pr_id == prid) {
 2512                         mtx_lock(&pr->pr_mtx);
 2513                         if (pr->pr_ref > 0)
 2514                                 return (pr);
 2515                         mtx_unlock(&pr->pr_mtx);
 2516                 }
 2517         }
 2518         return (NULL);
 2519 }
 2520 
 2521 /*
 2522  * Find a prison that is a descendant of mypr.  Returns a locked prison or NULL.
 2523  */
 2524 struct prison *
 2525 prison_find_child(struct prison *mypr, int prid)
 2526 {
 2527         struct prison *pr;
 2528         int descend;
 2529 
 2530         sx_assert(&allprison_lock, SX_LOCKED);
 2531         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2532                 if (pr->pr_id == prid) {
 2533                         mtx_lock(&pr->pr_mtx);
 2534                         if (pr->pr_ref > 0)
 2535                                 return (pr);
 2536                         mtx_unlock(&pr->pr_mtx);
 2537                 }
 2538         }
 2539         return (NULL);
 2540 }
 2541 
 2542 /*
 2543  * Look for the name relative to mypr.  Returns a locked prison or NULL.
 2544  */
 2545 struct prison *
 2546 prison_find_name(struct prison *mypr, const char *name)
 2547 {
 2548         struct prison *pr, *deadpr;
 2549         size_t mylen;
 2550         int descend;
 2551 
 2552         sx_assert(&allprison_lock, SX_LOCKED);
 2553         mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
 2554  again:
 2555         deadpr = NULL;
 2556         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2557                 if (!strcmp(pr->pr_name + mylen, name)) {
 2558                         mtx_lock(&pr->pr_mtx);
 2559                         if (pr->pr_ref > 0) {
 2560                                 if (pr->pr_uref > 0)
 2561                                         return (pr);
 2562                                 deadpr = pr;
 2563                         }
 2564                         mtx_unlock(&pr->pr_mtx);
 2565                 }
 2566         }
 2567         /* There was no valid prison - perhaps there was a dying one. */
 2568         if (deadpr != NULL) {
 2569                 mtx_lock(&deadpr->pr_mtx);
 2570                 if (deadpr->pr_ref == 0) {
 2571                         mtx_unlock(&deadpr->pr_mtx);
 2572                         goto again;
 2573                 }
 2574         }
 2575         return (deadpr);
 2576 }
 2577 
 2578 /*
 2579  * See if a prison has the specific flag set.
 2580  */
 2581 int
 2582 prison_flag(struct ucred *cred, unsigned flag)
 2583 {
 2584 
 2585         /* This is an atomic read, so no locking is necessary. */
 2586         return (cred->cr_prison->pr_flags & flag);
 2587 }
 2588 
 2589 int
 2590 prison_allow(struct ucred *cred, unsigned flag)
 2591 {
 2592 
 2593         /* This is an atomic read, so no locking is necessary. */
 2594         return (cred->cr_prison->pr_allow & flag);
 2595 }
 2596 
 2597 /*
 2598  * Remove a prison reference.  If that was the last reference, remove the
 2599  * prison itself - but not in this context in case there are locks held.
 2600  */
 2601 void
 2602 prison_free_locked(struct prison *pr)
 2603 {
 2604         int ref;
 2605 
 2606         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2607         ref = --pr->pr_ref;
 2608         mtx_unlock(&pr->pr_mtx);
 2609         if (ref == 0)
 2610                 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
 2611 }
 2612 
 2613 void
 2614 prison_free(struct prison *pr)
 2615 {
 2616 
 2617         mtx_lock(&pr->pr_mtx);
 2618         prison_free_locked(pr);
 2619 }
 2620 
 2621 /*
 2622  * Complete a call to either prison_free or prison_proc_free.
 2623  */
 2624 static void
 2625 prison_complete(void *context, int pending)
 2626 {
 2627         struct prison *pr = context;
 2628 
 2629         sx_xlock(&allprison_lock);
 2630         mtx_lock(&pr->pr_mtx);
 2631         prison_deref(pr, pr->pr_uref
 2632             ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED
 2633             : PD_LOCKED | PD_LIST_XLOCKED);
 2634 }
 2635 
 2636 /*
 2637  * Remove a prison reference (usually).  This internal version assumes no
 2638  * mutexes are held, except perhaps the prison itself.  If there are no more
 2639  * references, release and delist the prison.  On completion, the prison lock
 2640  * and the allprison lock are both unlocked.
 2641  */
 2642 static void
 2643 prison_deref(struct prison *pr, int flags)
 2644 {
 2645         struct prison *ppr, *tpr;
 2646         int ref, lasturef;
 2647 
 2648         if (!(flags & PD_LOCKED))
 2649                 mtx_lock(&pr->pr_mtx);
 2650         for (;;) {
 2651                 if (flags & PD_DEUREF) {
 2652                         KASSERT(pr->pr_uref > 0,
 2653                             ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
 2654                              pr->pr_id));
 2655                         pr->pr_uref--;
 2656                         lasturef = pr->pr_uref == 0;
 2657                         if (lasturef)
 2658                                 pr->pr_ref++;
 2659                         KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
 2660                 } else
 2661                         lasturef = 0;
 2662                 if (flags & PD_DEREF) {
 2663                         KASSERT(pr->pr_ref > 0,
 2664                             ("prison_deref PD_DEREF on a dead prison (jid=%d)",
 2665                              pr->pr_id));
 2666                         pr->pr_ref--;
 2667                 }
 2668                 ref = pr->pr_ref;
 2669                 mtx_unlock(&pr->pr_mtx);
 2670 
 2671                 /*
 2672                  * Tell the modules if the last user reference was removed
 2673                  * (even it sticks around in dying state).
 2674                  */
 2675                 if (lasturef) {
 2676                         if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
 2677                                 sx_xlock(&allprison_lock);
 2678                                 flags |= PD_LIST_XLOCKED;
 2679                         }
 2680                         (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
 2681                         mtx_lock(&pr->pr_mtx);
 2682                         ref = --pr->pr_ref;
 2683                         mtx_unlock(&pr->pr_mtx);
 2684                 }
 2685 
 2686                 /* If the prison still has references, nothing else to do. */
 2687                 if (ref > 0) {
 2688                         if (flags & PD_LIST_SLOCKED)
 2689                                 sx_sunlock(&allprison_lock);
 2690                         else if (flags & PD_LIST_XLOCKED)
 2691                                 sx_xunlock(&allprison_lock);
 2692                         return;
 2693                 }
 2694 
 2695                 if (flags & PD_LIST_SLOCKED) {
 2696                         if (!sx_try_upgrade(&allprison_lock)) {
 2697                                 sx_sunlock(&allprison_lock);
 2698                                 sx_xlock(&allprison_lock);
 2699                         }
 2700                 } else if (!(flags & PD_LIST_XLOCKED))
 2701                         sx_xlock(&allprison_lock);
 2702 
 2703                 TAILQ_REMOVE(&allprison, pr, pr_list);
 2704                 LIST_REMOVE(pr, pr_sibling);
 2705                 ppr = pr->pr_parent;
 2706                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 2707                         tpr->pr_childcount--;
 2708                 sx_xunlock(&allprison_lock);
 2709 
 2710 #ifdef VIMAGE
 2711                 if (pr->pr_vnet != ppr->pr_vnet)
 2712                         vnet_destroy(pr->pr_vnet);
 2713 #endif
 2714                 if (pr->pr_root != NULL)
 2715                         vrele(pr->pr_root);
 2716                 mtx_destroy(&pr->pr_mtx);
 2717 #ifdef INET
 2718                 free(pr->pr_ip4, M_PRISON);
 2719 #endif
 2720 #ifdef INET6
 2721                 free(pr->pr_ip6, M_PRISON);
 2722 #endif
 2723                 if (pr->pr_cpuset != NULL)
 2724                         cpuset_rel(pr->pr_cpuset);
 2725                 osd_jail_exit(pr);
 2726 #ifdef RACCT
 2727                 if (racct_enable)
 2728                         prison_racct_detach(pr);
 2729 #endif
 2730                 free(pr, M_PRISON);
 2731 
 2732                 /* Removing a prison frees a reference on its parent. */
 2733                 pr = ppr;
 2734                 mtx_lock(&pr->pr_mtx);
 2735                 flags = PD_DEREF | PD_DEUREF;
 2736         }
 2737 }
 2738 
 2739 void
 2740 prison_hold_locked(struct prison *pr)
 2741 {
 2742 
 2743         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2744         KASSERT(pr->pr_ref > 0,
 2745             ("Trying to hold dead prison (jid=%d).", pr->pr_id));
 2746         pr->pr_ref++;
 2747 }
 2748 
 2749 void
 2750 prison_hold(struct prison *pr)
 2751 {
 2752 
 2753         mtx_lock(&pr->pr_mtx);
 2754         prison_hold_locked(pr);
 2755         mtx_unlock(&pr->pr_mtx);
 2756 }
 2757 
 2758 void
 2759 prison_proc_hold(struct prison *pr)
 2760 {
 2761 
 2762         mtx_lock(&pr->pr_mtx);
 2763         KASSERT(pr->pr_uref > 0,
 2764             ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
 2765         pr->pr_uref++;
 2766         mtx_unlock(&pr->pr_mtx);
 2767 }
 2768 
 2769 void
 2770 prison_proc_free(struct prison *pr)
 2771 {
 2772 
 2773         mtx_lock(&pr->pr_mtx);
 2774         KASSERT(pr->pr_uref > 0,
 2775             ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
 2776         if (pr->pr_uref > 1)
 2777                 pr->pr_uref--;
 2778         else {
 2779                 /*
 2780                  * Don't remove the last user reference in this context, which
 2781                  * is expected to be a process that is not only locked, but
 2782                  * also half dead.
 2783                  */
 2784                 pr->pr_ref++;
 2785                 mtx_unlock(&pr->pr_mtx);
 2786                 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
 2787                 return;
 2788         }
 2789         mtx_unlock(&pr->pr_mtx);
 2790 }
 2791 
 2792 
 2793 #ifdef INET
 2794 /*
 2795  * Restrict a prison's IP address list with its parent's, possibly replacing
 2796  * it.  Return true if the replacement buffer was used (or would have been).
 2797  */
 2798 static int
 2799 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
 2800 {
 2801         int ii, ij, used;
 2802         struct prison *ppr;
 2803 
 2804         ppr = pr->pr_parent;
 2805         if (!(pr->pr_flags & PR_IP4_USER)) {
 2806                 /* This has no user settings, so just copy the parent's list. */
 2807                 if (pr->pr_ip4s < ppr->pr_ip4s) {
 2808                         /*
 2809                          * There's no room for the parent's list.  Use the
 2810                          * new list buffer, which is assumed to be big enough
 2811                          * (if it was passed).  If there's no buffer, try to
 2812                          * allocate one.
 2813                          */
 2814                         used = 1;
 2815                         if (newip4 == NULL) {
 2816                                 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
 2817                                     M_PRISON, M_NOWAIT);
 2818                                 if (newip4 != NULL)
 2819                                         used = 0;
 2820                         }
 2821                         if (newip4 != NULL) {
 2822                                 bcopy(ppr->pr_ip4, newip4,
 2823                                     ppr->pr_ip4s * sizeof(*newip4));
 2824                                 free(pr->pr_ip4, M_PRISON);
 2825                                 pr->pr_ip4 = newip4;
 2826                                 pr->pr_ip4s = ppr->pr_ip4s;
 2827                         }
 2828                         return (used);
 2829                 }
 2830                 pr->pr_ip4s = ppr->pr_ip4s;
 2831                 if (pr->pr_ip4s > 0)
 2832                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 2833                             pr->pr_ip4s * sizeof(*newip4));
 2834                 else if (pr->pr_ip4 != NULL) {
 2835                         free(pr->pr_ip4, M_PRISON);
 2836                         pr->pr_ip4 = NULL;
 2837                 }
 2838         } else if (pr->pr_ip4s > 0) {
 2839                 /* Remove addresses that aren't in the parent. */
 2840                 for (ij = 0; ij < ppr->pr_ip4s; ij++)
 2841                         if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 2842                                 break;
 2843                 if (ij < ppr->pr_ip4s)
 2844                         ii = 1;
 2845                 else {
 2846                         bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
 2847                             --pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2848                         ii = 0;
 2849                 }
 2850                 for (ij = 1; ii < pr->pr_ip4s; ) {
 2851                         if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
 2852                                 ii++;
 2853                                 continue;
 2854                         }
 2855                         switch (ij >= ppr->pr_ip4s ? -1 :
 2856                                 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
 2857                         case -1:
 2858                                 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
 2859                                     (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
 2860                                 break;
 2861                         case 0:
 2862                                 ii++;
 2863                                 ij++;
 2864                                 break;
 2865                         case 1:
 2866                                 ij++;
 2867                                 break;
 2868                         }
 2869                 }
 2870                 if (pr->pr_ip4s == 0) {
 2871                         pr->pr_flags |= PR_IP4_DISABLE;
 2872                         free(pr->pr_ip4, M_PRISON);
 2873                         pr->pr_ip4 = NULL;
 2874                 }
 2875         }
 2876         return (0);
 2877 }
 2878 
 2879 /*
 2880  * Pass back primary IPv4 address of this jail.
 2881  *
 2882  * If not restricted return success but do not alter the address.  Caller has
 2883  * to make sure to initialize it correctly (e.g. INADDR_ANY).
 2884  *
 2885  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 2886  * Address returned in NBO.
 2887  */
 2888 int
 2889 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
 2890 {
 2891         struct prison *pr;
 2892 
 2893         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2894         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2895 
 2896         pr = cred->cr_prison;
 2897         if (!(pr->pr_flags & PR_IP4))
 2898                 return (0);
 2899         mtx_lock(&pr->pr_mtx);
 2900         if (!(pr->pr_flags & PR_IP4)) {
 2901                 mtx_unlock(&pr->pr_mtx);
 2902                 return (0);
 2903         }
 2904         if (pr->pr_ip4 == NULL) {
 2905                 mtx_unlock(&pr->pr_mtx);
 2906                 return (EAFNOSUPPORT);
 2907         }
 2908 
 2909         ia->s_addr = pr->pr_ip4[0].s_addr;
 2910         mtx_unlock(&pr->pr_mtx);
 2911         return (0);
 2912 }
 2913 
 2914 /*
 2915  * Return 1 if we should do proper source address selection or are not jailed.
 2916  * We will return 0 if we should bypass source address selection in favour
 2917  * of the primary jail IPv4 address. Only in this case *ia will be updated and
 2918  * returned in NBO.
 2919  * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
 2920  */
 2921 int
 2922 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
 2923 {
 2924         struct prison *pr;
 2925         struct in_addr lia;
 2926         int error;
 2927 
 2928         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2929         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2930 
 2931         if (!jailed(cred))
 2932                 return (1);
 2933 
 2934         pr = cred->cr_prison;
 2935         if (pr->pr_flags & PR_IP4_SADDRSEL)
 2936                 return (1);
 2937 
 2938         lia.s_addr = INADDR_ANY;
 2939         error = prison_get_ip4(cred, &lia);
 2940         if (error)
 2941                 return (error);
 2942         if (lia.s_addr == INADDR_ANY)
 2943                 return (1);
 2944 
 2945         ia->s_addr = lia.s_addr;
 2946         return (0);
 2947 }
 2948 
 2949 /*
 2950  * Return true if pr1 and pr2 have the same IPv4 address restrictions.
 2951  */
 2952 int
 2953 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
 2954 {
 2955 
 2956         if (pr1 == pr2)
 2957                 return (1);
 2958 
 2959         /*
 2960          * No need to lock since the PR_IP4_USER flag can't be altered for
 2961          * existing prisons.
 2962          */
 2963         while (pr1 != &prison0 &&
 2964 #ifdef VIMAGE
 2965                !(pr1->pr_flags & PR_VNET) &&
 2966 #endif
 2967                !(pr1->pr_flags & PR_IP4_USER))
 2968                 pr1 = pr1->pr_parent;
 2969         while (pr2 != &prison0 &&
 2970 #ifdef VIMAGE
 2971                !(pr2->pr_flags & PR_VNET) &&
 2972 #endif
 2973                !(pr2->pr_flags & PR_IP4_USER))
 2974                 pr2 = pr2->pr_parent;
 2975         return (pr1 == pr2);
 2976 }
 2977 
 2978 /*
 2979  * Make sure our (source) address is set to something meaningful to this
 2980  * jail.
 2981  *
 2982  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 2983  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 2984  * doesn't allow IPv4.  Address passed in in NBO and returned in NBO.
 2985  */
 2986 int
 2987 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
 2988 {
 2989         struct prison *pr;
 2990         struct in_addr ia0;
 2991         int error;
 2992 
 2993         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2994         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2995 
 2996         pr = cred->cr_prison;
 2997         if (!(pr->pr_flags & PR_IP4))
 2998                 return (0);
 2999         mtx_lock(&pr->pr_mtx);
 3000         if (!(pr->pr_flags & PR_IP4)) {
 3001                 mtx_unlock(&pr->pr_mtx);
 3002                 return (0);
 3003         }
 3004         if (pr->pr_ip4 == NULL) {
 3005                 mtx_unlock(&pr->pr_mtx);
 3006                 return (EAFNOSUPPORT);
 3007         }
 3008 
 3009         ia0.s_addr = ntohl(ia->s_addr);
 3010         if (ia0.s_addr == INADDR_LOOPBACK) {
 3011                 ia->s_addr = pr->pr_ip4[0].s_addr;
 3012                 mtx_unlock(&pr->pr_mtx);
 3013                 return (0);
 3014         }
 3015 
 3016         if (ia0.s_addr == INADDR_ANY) {
 3017                 /*
 3018                  * In case there is only 1 IPv4 address, bind directly.
 3019                  */
 3020                 if (pr->pr_ip4s == 1)
 3021                         ia->s_addr = pr->pr_ip4[0].s_addr;
 3022                 mtx_unlock(&pr->pr_mtx);
 3023                 return (0);
 3024         }
 3025 
 3026         error = _prison_check_ip4(pr, ia);
 3027         mtx_unlock(&pr->pr_mtx);
 3028         return (error);
 3029 }
 3030 
 3031 /*
 3032  * Rewrite destination address in case we will connect to loopback address.
 3033  *
 3034  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 3035  * Address passed in in NBO and returned in NBO.
 3036  */
 3037 int
 3038 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
 3039 {
 3040         struct prison *pr;
 3041 
 3042         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3043         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 3044 
 3045         pr = cred->cr_prison;
 3046         if (!(pr->pr_flags & PR_IP4))
 3047                 return (0);
 3048         mtx_lock(&pr->pr_mtx);
 3049         if (!(pr->pr_flags & PR_IP4)) {
 3050                 mtx_unlock(&pr->pr_mtx);
 3051                 return (0);
 3052         }
 3053         if (pr->pr_ip4 == NULL) {
 3054                 mtx_unlock(&pr->pr_mtx);
 3055                 return (EAFNOSUPPORT);
 3056         }
 3057 
 3058         if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
 3059                 ia->s_addr = pr->pr_ip4[0].s_addr;
 3060                 mtx_unlock(&pr->pr_mtx);
 3061                 return (0);
 3062         }
 3063 
 3064         /*
 3065          * Return success because nothing had to be changed.
 3066          */
 3067         mtx_unlock(&pr->pr_mtx);
 3068         return (0);
 3069 }
 3070 
 3071 /*
 3072  * Check if given address belongs to the jail referenced by cred/prison.
 3073  *
 3074  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 3075  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3076  * doesn't allow IPv4.  Address passed in in NBO.
 3077  */
 3078 static int
 3079 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
 3080 {
 3081         int i, a, z, d;
 3082 
 3083         /*
 3084          * Check the primary IP.
 3085          */
 3086         if (pr->pr_ip4[0].s_addr == ia->s_addr)
 3087                 return (0);
 3088 
 3089         /*
 3090          * All the other IPs are sorted so we can do a binary search.
 3091          */
 3092         a = 0;
 3093         z = pr->pr_ip4s - 2;
 3094         while (a <= z) {
 3095                 i = (a + z) / 2;
 3096                 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
 3097                 if (d > 0)
 3098                         z = i - 1;
 3099                 else if (d < 0)
 3100                         a = i + 1;
 3101                 else
 3102                         return (0);
 3103         }
 3104 
 3105         return (EADDRNOTAVAIL);
 3106 }
 3107 
 3108 int
 3109 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
 3110 {
 3111         struct prison *pr;
 3112         int error;
 3113 
 3114         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3115         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 3116 
 3117         pr = cred->cr_prison;
 3118         if (!(pr->pr_flags & PR_IP4))
 3119                 return (0);
 3120         mtx_lock(&pr->pr_mtx);
 3121         if (!(pr->pr_flags & PR_IP4)) {
 3122                 mtx_unlock(&pr->pr_mtx);
 3123                 return (0);
 3124         }
 3125         if (pr->pr_ip4 == NULL) {
 3126                 mtx_unlock(&pr->pr_mtx);
 3127                 return (EAFNOSUPPORT);
 3128         }
 3129 
 3130         error = _prison_check_ip4(pr, ia);
 3131         mtx_unlock(&pr->pr_mtx);
 3132         return (error);
 3133 }
 3134 #endif
 3135 
 3136 #ifdef INET6
 3137 static int
 3138 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
 3139 {
 3140         int ii, ij, used;
 3141         struct prison *ppr;
 3142 
 3143         ppr = pr->pr_parent;
 3144         if (!(pr->pr_flags & PR_IP6_USER)) {
 3145                 /* This has no user settings, so just copy the parent's list. */
 3146                 if (pr->pr_ip6s < ppr->pr_ip6s) {
 3147                         /*
 3148                          * There's no room for the parent's list.  Use the
 3149                          * new list buffer, which is assumed to be big enough
 3150                          * (if it was passed).  If there's no buffer, try to
 3151                          * allocate one.
 3152                          */
 3153                         used = 1;
 3154                         if (newip6 == NULL) {
 3155                                 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
 3156                                     M_PRISON, M_NOWAIT);
 3157                                 if (newip6 != NULL)
 3158                                         used = 0;
 3159                         }
 3160                         if (newip6 != NULL) {
 3161                                 bcopy(ppr->pr_ip6, newip6,
 3162                                     ppr->pr_ip6s * sizeof(*newip6));
 3163                                 free(pr->pr_ip6, M_PRISON);
 3164                                 pr->pr_ip6 = newip6;
 3165                                 pr->pr_ip6s = ppr->pr_ip6s;
 3166                         }
 3167                         return (used);
 3168                 }
 3169                 pr->pr_ip6s = ppr->pr_ip6s;
 3170                 if (pr->pr_ip6s > 0)
 3171                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 3172                             pr->pr_ip6s * sizeof(*newip6));
 3173                 else if (pr->pr_ip6 != NULL) {
 3174                         free(pr->pr_ip6, M_PRISON);
 3175                         pr->pr_ip6 = NULL;
 3176                 }
 3177         } else if (pr->pr_ip6s > 0) {
 3178                 /* Remove addresses that aren't in the parent. */
 3179                 for (ij = 0; ij < ppr->pr_ip6s; ij++)
 3180                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
 3181                             &ppr->pr_ip6[ij]))
 3182                                 break;
 3183                 if (ij < ppr->pr_ip6s)
 3184                         ii = 1;
 3185                 else {
 3186                         bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
 3187                             --pr->pr_ip6s * sizeof(*pr->pr_ip6));
 3188                         ii = 0;
 3189                 }
 3190                 for (ij = 1; ii < pr->pr_ip6s; ) {
 3191                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
 3192                             &ppr->pr_ip6[0])) {
 3193                                 ii++;
 3194                                 continue;
 3195                         }
 3196                         switch (ij >= ppr->pr_ip6s ? -1 :
 3197                                 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
 3198                         case -1:
 3199                                 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
 3200                                     (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
 3201                                 break;
 3202                         case 0:
 3203                                 ii++;
 3204                                 ij++;
 3205                                 break;
 3206                         case 1:
 3207                                 ij++;
 3208                                 break;
 3209                         }
 3210                 }
 3211                 if (pr->pr_ip6s == 0) {
 3212                         pr->pr_flags |= PR_IP6_DISABLE;
 3213                         free(pr->pr_ip6, M_PRISON);
 3214                         pr->pr_ip6 = NULL;
 3215                 }
 3216         }
 3217         return 0;
 3218 }
 3219 
 3220 /*
 3221  * Pass back primary IPv6 address for this jail.
 3222  *
 3223  * If not restricted return success but do not alter the address.  Caller has
 3224  * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
 3225  *
 3226  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3227  */
 3228 int
 3229 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
 3230 {
 3231         struct prison *pr;
 3232 
 3233         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3234         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3235 
 3236         pr = cred->cr_prison;
 3237         if (!(pr->pr_flags & PR_IP6))
 3238                 return (0);
 3239         mtx_lock(&pr->pr_mtx);
 3240         if (!(pr->pr_flags & PR_IP6)) {
 3241                 mtx_unlock(&pr->pr_mtx);
 3242                 return (0);
 3243         }
 3244         if (pr->pr_ip6 == NULL) {
 3245                 mtx_unlock(&pr->pr_mtx);
 3246                 return (EAFNOSUPPORT);
 3247         }
 3248 
 3249         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3250         mtx_unlock(&pr->pr_mtx);
 3251         return (0);
 3252 }
 3253 
 3254 /*
 3255  * Return 1 if we should do proper source address selection or are not jailed.
 3256  * We will return 0 if we should bypass source address selection in favour
 3257  * of the primary jail IPv6 address. Only in this case *ia will be updated and
 3258  * returned in NBO.
 3259  * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
 3260  */
 3261 int
 3262 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
 3263 {
 3264         struct prison *pr;
 3265         struct in6_addr lia6;
 3266         int error;
 3267 
 3268         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3269         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3270 
 3271         if (!jailed(cred))
 3272                 return (1);
 3273 
 3274         pr = cred->cr_prison;
 3275         if (pr->pr_flags & PR_IP6_SADDRSEL)
 3276                 return (1);
 3277 
 3278         lia6 = in6addr_any;
 3279         error = prison_get_ip6(cred, &lia6);
 3280         if (error)
 3281                 return (error);
 3282         if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
 3283                 return (1);
 3284 
 3285         bcopy(&lia6, ia6, sizeof(struct in6_addr));
 3286         return (0);
 3287 }
 3288 
 3289 /*
 3290  * Return true if pr1 and pr2 have the same IPv6 address restrictions.
 3291  */
 3292 int
 3293 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
 3294 {
 3295 
 3296         if (pr1 == pr2)
 3297                 return (1);
 3298 
 3299         while (pr1 != &prison0 &&
 3300 #ifdef VIMAGE
 3301                !(pr1->pr_flags & PR_VNET) &&
 3302 #endif
 3303                !(pr1->pr_flags & PR_IP6_USER))
 3304                 pr1 = pr1->pr_parent;
 3305         while (pr2 != &prison0 &&
 3306 #ifdef VIMAGE
 3307                !(pr2->pr_flags & PR_VNET) &&
 3308 #endif
 3309                !(pr2->pr_flags & PR_IP6_USER))
 3310                 pr2 = pr2->pr_parent;
 3311         return (pr1 == pr2);
 3312 }
 3313 
 3314 /*
 3315  * Make sure our (source) address is set to something meaningful to this jail.
 3316  *
 3317  * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
 3318  * when needed while binding.
 3319  *
 3320  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3321  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3322  * doesn't allow IPv6.
 3323  */
 3324 int
 3325 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
 3326 {
 3327         struct prison *pr;
 3328         int error;
 3329 
 3330         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3331         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3332 
 3333         pr = cred->cr_prison;
 3334         if (!(pr->pr_flags & PR_IP6))
 3335                 return (0);
 3336         mtx_lock(&pr->pr_mtx);
 3337         if (!(pr->pr_flags & PR_IP6)) {
 3338                 mtx_unlock(&pr->pr_mtx);
 3339                 return (0);
 3340         }
 3341         if (pr->pr_ip6 == NULL) {
 3342                 mtx_unlock(&pr->pr_mtx);
 3343                 return (EAFNOSUPPORT);
 3344         }
 3345 
 3346         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3347                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3348                 mtx_unlock(&pr->pr_mtx);
 3349                 return (0);
 3350         }
 3351 
 3352         if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
 3353                 /*
 3354                  * In case there is only 1 IPv6 address, and v6only is true,
 3355                  * then bind directly.
 3356                  */
 3357                 if (v6only != 0 && pr->pr_ip6s == 1)
 3358                         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3359                 mtx_unlock(&pr->pr_mtx);
 3360                 return (0);
 3361         }
 3362 
 3363         error = _prison_check_ip6(pr, ia6);
 3364         mtx_unlock(&pr->pr_mtx);
 3365         return (error);
 3366 }
 3367 
 3368 /*
 3369  * Rewrite destination address in case we will connect to loopback address.
 3370  *
 3371  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3372  */
 3373 int
 3374 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
 3375 {
 3376         struct prison *pr;
 3377 
 3378         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3379         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3380 
 3381         pr = cred->cr_prison;
 3382         if (!(pr->pr_flags & PR_IP6))
 3383                 return (0);
 3384         mtx_lock(&pr->pr_mtx);
 3385         if (!(pr->pr_flags & PR_IP6)) {
 3386                 mtx_unlock(&pr->pr_mtx);
 3387                 return (0);
 3388         }
 3389         if (pr->pr_ip6 == NULL) {
 3390                 mtx_unlock(&pr->pr_mtx);
 3391                 return (EAFNOSUPPORT);
 3392         }
 3393 
 3394         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3395                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3396                 mtx_unlock(&pr->pr_mtx);
 3397                 return (0);
 3398         }
 3399 
 3400         /*
 3401          * Return success because nothing had to be changed.
 3402          */
 3403         mtx_unlock(&pr->pr_mtx);
 3404         return (0);
 3405 }
 3406 
 3407 /*
 3408  * Check if given address belongs to the jail referenced by cred/prison.
 3409  *
 3410  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3411  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3412  * doesn't allow IPv6.
 3413  */
 3414 static int
 3415 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
 3416 {
 3417         int i, a, z, d;
 3418 
 3419         /*
 3420          * Check the primary IP.
 3421          */
 3422         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
 3423                 return (0);
 3424 
 3425         /*
 3426          * All the other IPs are sorted so we can do a binary search.
 3427          */
 3428         a = 0;
 3429         z = pr->pr_ip6s - 2;
 3430         while (a <= z) {
 3431                 i = (a + z) / 2;
 3432                 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
 3433                 if (d > 0)
 3434                         z = i - 1;
 3435                 else if (d < 0)
 3436                         a = i + 1;
 3437                 else
 3438                         return (0);
 3439         }
 3440 
 3441         return (EADDRNOTAVAIL);
 3442 }
 3443 
 3444 int
 3445 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
 3446 {
 3447         struct prison *pr;
 3448         int error;
 3449 
 3450         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3451         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3452 
 3453         pr = cred->cr_prison;
 3454         if (!(pr->pr_flags & PR_IP6))
 3455                 return (0);
 3456         mtx_lock(&pr->pr_mtx);
 3457         if (!(pr->pr_flags & PR_IP6)) {
 3458                 mtx_unlock(&pr->pr_mtx);
 3459                 return (0);
 3460         }
 3461         if (pr->pr_ip6 == NULL) {
 3462                 mtx_unlock(&pr->pr_mtx);
 3463                 return (EAFNOSUPPORT);
 3464         }
 3465 
 3466         error = _prison_check_ip6(pr, ia6);
 3467         mtx_unlock(&pr->pr_mtx);
 3468         return (error);
 3469 }
 3470 #endif
 3471 
 3472 /*
 3473  * Check if a jail supports the given address family.
 3474  *
 3475  * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
 3476  * if not.
 3477  */
 3478 int
 3479 prison_check_af(struct ucred *cred, int af)
 3480 {
 3481         struct prison *pr;
 3482         int error;
 3483 
 3484         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3485 
 3486         pr = cred->cr_prison;
 3487 #ifdef VIMAGE
 3488         /* Prisons with their own network stack are not limited. */
 3489         if (prison_owns_vnet(cred))
 3490                 return (0);
 3491 #endif
 3492 
 3493         error = 0;
 3494         switch (af)
 3495         {
 3496 #ifdef INET
 3497         case AF_INET:
 3498                 if (pr->pr_flags & PR_IP4)
 3499                 {
 3500                         mtx_lock(&pr->pr_mtx);
 3501                         if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
 3502                                 error = EAFNOSUPPORT;
 3503                         mtx_unlock(&pr->pr_mtx);
 3504                 }
 3505                 break;
 3506 #endif
 3507 #ifdef INET6
 3508         case AF_INET6:
 3509                 if (pr->pr_flags & PR_IP6)
 3510                 {
 3511                         mtx_lock(&pr->pr_mtx);
 3512                         if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
 3513                                 error = EAFNOSUPPORT;
 3514                         mtx_unlock(&pr->pr_mtx);
 3515                 }
 3516                 break;
 3517 #endif
 3518         case AF_LOCAL:
 3519         case AF_ROUTE:
 3520                 break;
 3521         default:
 3522                 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
 3523                         error = EAFNOSUPPORT;
 3524         }
 3525         return (error);
 3526 }
 3527 
 3528 /*
 3529  * Check if given address belongs to the jail referenced by cred (wrapper to
 3530  * prison_check_ip[46]).
 3531  *
 3532  * Returns 0 if jail doesn't restrict the address family or if address belongs
 3533  * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
 3534  * the jail doesn't allow the address family.  IPv4 Address passed in in NBO.
 3535  */
 3536 int
 3537 prison_if(struct ucred *cred, struct sockaddr *sa)
 3538 {
 3539 #ifdef INET
 3540         struct sockaddr_in *sai;
 3541 #endif
 3542 #ifdef INET6
 3543         struct sockaddr_in6 *sai6;
 3544 #endif
 3545         int error;
 3546 
 3547         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3548         KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
 3549 
 3550 #ifdef VIMAGE
 3551         if (prison_owns_vnet(cred))
 3552                 return (0);
 3553 #endif
 3554 
 3555         error = 0;
 3556         switch (sa->sa_family)
 3557         {
 3558 #ifdef INET
 3559         case AF_INET:
 3560                 sai = (struct sockaddr_in *)sa;
 3561                 error = prison_check_ip4(cred, &sai->sin_addr);
 3562                 break;
 3563 #endif
 3564 #ifdef INET6
 3565         case AF_INET6:
 3566                 sai6 = (struct sockaddr_in6 *)sa;
 3567                 error = prison_check_ip6(cred, &sai6->sin6_addr);
 3568                 break;
 3569 #endif
 3570         default:
 3571                 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
 3572                         error = EAFNOSUPPORT;
 3573         }
 3574         return (error);
 3575 }
 3576 
 3577 /*
 3578  * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
 3579  */
 3580 int
 3581 prison_check(struct ucred *cred1, struct ucred *cred2)
 3582 {
 3583 
 3584         return ((cred1->cr_prison == cred2->cr_prison ||
 3585             prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
 3586 }
 3587 
 3588 /*
 3589  * Return 1 if p2 is a child of p1, otherwise 0.
 3590  */
 3591 int
 3592 prison_ischild(struct prison *pr1, struct prison *pr2)
 3593 {
 3594 
 3595         for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
 3596                 if (pr1 == pr2)
 3597                         return (1);
 3598         return (0);
 3599 }
 3600 
 3601 /*
 3602  * Return 1 if the passed credential is in a jail, otherwise 0.
 3603  */
 3604 int
 3605 jailed(struct ucred *cred)
 3606 {
 3607 
 3608         return (cred->cr_prison != &prison0);
 3609 }
 3610 
 3611 /*
 3612  * Return 1 if the passed credential is in a jail and that jail does not
 3613  * have its own virtual network stack, otherwise 0.
 3614  */
 3615 int
 3616 jailed_without_vnet(struct ucred *cred)
 3617 {
 3618 
 3619         if (!jailed(cred))
 3620                 return (0);
 3621 #ifdef VIMAGE
 3622         if (prison_owns_vnet(cred))
 3623                 return (0);
 3624 #endif
 3625 
 3626         return (1);
 3627 }
 3628 
 3629 /*
 3630  * Return the correct hostname (domainname, et al) for the passed credential.
 3631  */
 3632 void
 3633 getcredhostname(struct ucred *cred, char *buf, size_t size)
 3634 {
 3635         struct prison *pr;
 3636 
 3637         /*
 3638          * A NULL credential can be used to shortcut to the physical
 3639          * system's hostname.
 3640          */
 3641         pr = (cred != NULL) ? cred->cr_prison : &prison0;
 3642         mtx_lock(&pr->pr_mtx);
 3643         strlcpy(buf, pr->pr_hostname, size);
 3644         mtx_unlock(&pr->pr_mtx);
 3645 }
 3646 
 3647 void
 3648 getcreddomainname(struct ucred *cred, char *buf, size_t size)
 3649 {
 3650 
 3651         mtx_lock(&cred->cr_prison->pr_mtx);
 3652         strlcpy(buf, cred->cr_prison->pr_domainname, size);
 3653         mtx_unlock(&cred->cr_prison->pr_mtx);
 3654 }
 3655 
 3656 void
 3657 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
 3658 {
 3659 
 3660         mtx_lock(&cred->cr_prison->pr_mtx);
 3661         strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
 3662         mtx_unlock(&cred->cr_prison->pr_mtx);
 3663 }
 3664 
 3665 void
 3666 getcredhostid(struct ucred *cred, unsigned long *hostid)
 3667 {
 3668 
 3669         mtx_lock(&cred->cr_prison->pr_mtx);
 3670         *hostid = cred->cr_prison->pr_hostid;
 3671         mtx_unlock(&cred->cr_prison->pr_mtx);
 3672 }
 3673 
 3674 #ifdef VIMAGE
 3675 /*
 3676  * Determine whether the prison represented by cred owns
 3677  * its vnet rather than having it inherited.
 3678  *
 3679  * Returns 1 in case the prison owns the vnet, 0 otherwise.
 3680  */
 3681 int
 3682 prison_owns_vnet(struct ucred *cred)
 3683 {
 3684 
 3685         /*
 3686          * vnets cannot be added/removed after jail creation,
 3687          * so no need to lock here.
 3688          */
 3689         return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
 3690 }
 3691 #endif
 3692 
 3693 /*
 3694  * Determine whether the subject represented by cred can "see"
 3695  * status of a mount point.
 3696  * Returns: 0 for permitted, ENOENT otherwise.
 3697  * XXX: This function should be called cr_canseemount() and should be
 3698  *      placed in kern_prot.c.
 3699  */
 3700 int
 3701 prison_canseemount(struct ucred *cred, struct mount *mp)
 3702 {
 3703         struct prison *pr;
 3704         struct statfs *sp;
 3705         size_t len;
 3706 
 3707         pr = cred->cr_prison;
 3708         if (pr->pr_enforce_statfs == 0)
 3709                 return (0);
 3710         if (pr->pr_root->v_mount == mp)
 3711                 return (0);
 3712         if (pr->pr_enforce_statfs == 2)
 3713                 return (ENOENT);
 3714         /*
 3715          * If jail's chroot directory is set to "/" we should be able to see
 3716          * all mount-points from inside a jail.
 3717          * This is ugly check, but this is the only situation when jail's
 3718          * directory ends with '/'.
 3719          */
 3720         if (strcmp(pr->pr_path, "/") == 0)
 3721                 return (0);
 3722         len = strlen(pr->pr_path);
 3723         sp = &mp->mnt_stat;
 3724         if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
 3725                 return (ENOENT);
 3726         /*
 3727          * Be sure that we don't have situation where jail's root directory
 3728          * is "/some/path" and mount point is "/some/pathpath".
 3729          */
 3730         if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
 3731                 return (ENOENT);
 3732         return (0);
 3733 }
 3734 
 3735 void
 3736 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
 3737 {
 3738         char jpath[MAXPATHLEN];
 3739         struct prison *pr;
 3740         size_t len;
 3741 
 3742         pr = cred->cr_prison;
 3743         if (pr->pr_enforce_statfs == 0)
 3744                 return;
 3745         if (prison_canseemount(cred, mp) != 0) {
 3746                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3747                 strlcpy(sp->f_mntonname, "[restricted]",
 3748                     sizeof(sp->f_mntonname));
 3749                 return;
 3750         }
 3751         if (pr->pr_root->v_mount == mp) {
 3752                 /*
 3753                  * Clear current buffer data, so we are sure nothing from
 3754                  * the valid path left there.
 3755                  */
 3756                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3757                 *sp->f_mntonname = '/';
 3758                 return;
 3759         }
 3760         /*
 3761          * If jail's chroot directory is set to "/" we should be able to see
 3762          * all mount-points from inside a jail.
 3763          */
 3764         if (strcmp(pr->pr_path, "/") == 0)
 3765                 return;
 3766         len = strlen(pr->pr_path);
 3767         strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
 3768         /*
 3769          * Clear current buffer data, so we are sure nothing from
 3770          * the valid path left there.
 3771          */
 3772         bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3773         if (*jpath == '\0') {
 3774                 /* Should never happen. */
 3775                 *sp->f_mntonname = '/';
 3776         } else {
 3777                 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
 3778         }
 3779 }
 3780 
 3781 /*
 3782  * Check with permission for a specific privilege is granted within jail.  We
 3783  * have a specific list of accepted privileges; the rest are denied.
 3784  */
 3785 int
 3786 prison_priv_check(struct ucred *cred, int priv)
 3787 {
 3788 
 3789         if (!jailed(cred))
 3790                 return (0);
 3791 
 3792 #ifdef VIMAGE
 3793         /*
 3794          * Privileges specific to prisons with a virtual network stack.
 3795          * There might be a duplicate entry here in case the privilege
 3796          * is only granted conditionally in the legacy jail case.
 3797          */
 3798         switch (priv) {
 3799 #ifdef notyet
 3800                 /*
 3801                  * NFS-specific privileges.
 3802                  */
 3803         case PRIV_NFS_DAEMON:
 3804         case PRIV_NFS_LOCKD:
 3805 #endif
 3806                 /*
 3807                  * Network stack privileges.
 3808                  */
 3809         case PRIV_NET_BRIDGE:
 3810         case PRIV_NET_GRE:
 3811         case PRIV_NET_BPF:
 3812         case PRIV_NET_RAW:              /* Dup, cond. in legacy jail case. */
 3813         case PRIV_NET_ROUTE:
 3814         case PRIV_NET_TAP:
 3815         case PRIV_NET_SETIFMTU:
 3816         case PRIV_NET_SETIFFLAGS:
 3817         case PRIV_NET_SETIFCAP:
 3818         case PRIV_NET_SETIFDESCR:
 3819         case PRIV_NET_SETIFNAME :
 3820         case PRIV_NET_SETIFMETRIC:
 3821         case PRIV_NET_SETIFPHYS:
 3822         case PRIV_NET_SETIFMAC:
 3823         case PRIV_NET_ADDMULTI:
 3824         case PRIV_NET_DELMULTI:
 3825         case PRIV_NET_HWIOCTL:
 3826         case PRIV_NET_SETLLADDR:
 3827         case PRIV_NET_ADDIFGROUP:
 3828         case PRIV_NET_DELIFGROUP:
 3829         case PRIV_NET_IFCREATE:
 3830         case PRIV_NET_IFDESTROY:
 3831         case PRIV_NET_ADDIFADDR:
 3832         case PRIV_NET_DELIFADDR:
 3833         case PRIV_NET_LAGG:
 3834         case PRIV_NET_GIF:
 3835         case PRIV_NET_SETIFVNET:
 3836         case PRIV_NET_SETIFFIB:
 3837 
 3838                 /*
 3839                  * 802.11-related privileges.
 3840                  */
 3841         case PRIV_NET80211_GETKEY:
 3842 #ifdef notyet
 3843         case PRIV_NET80211_MANAGE:              /* XXX-BZ discuss with sam@ */
 3844 #endif
 3845 
 3846 #ifdef notyet
 3847                 /*
 3848                  * AppleTalk privileges.
 3849                  */
 3850         case PRIV_NETATALK_RESERVEDPORT:
 3851 
 3852                 /*
 3853                  * ATM privileges.
 3854                  */
 3855         case PRIV_NETATM_CFG:
 3856         case PRIV_NETATM_ADD:
 3857         case PRIV_NETATM_DEL:
 3858         case PRIV_NETATM_SET:
 3859 
 3860                 /*
 3861                  * Bluetooth privileges.
 3862                  */
 3863         case PRIV_NETBLUETOOTH_RAW:
 3864 #endif
 3865 
 3866                 /*
 3867                  * Netgraph and netgraph module privileges.
 3868                  */
 3869         case PRIV_NETGRAPH_CONTROL:
 3870 #ifdef notyet
 3871         case PRIV_NETGRAPH_TTY:
 3872 #endif
 3873 
 3874                 /*
 3875                  * IPv4 and IPv6 privileges.
 3876                  */
 3877         case PRIV_NETINET_IPFW:
 3878         case PRIV_NETINET_DIVERT:
 3879         case PRIV_NETINET_PF:
 3880         case PRIV_NETINET_DUMMYNET:
 3881         case PRIV_NETINET_CARP:
 3882         case PRIV_NETINET_MROUTE:
 3883         case PRIV_NETINET_RAW:
 3884         case PRIV_NETINET_ADDRCTRL6:
 3885         case PRIV_NETINET_ND6:
 3886         case PRIV_NETINET_SCOPE6:
 3887         case PRIV_NETINET_ALIFETIME6:
 3888         case PRIV_NETINET_IPSEC:
 3889         case PRIV_NETINET_BINDANY:
 3890 
 3891 #ifdef notyet
 3892                 /*
 3893                  * IPX/SPX privileges.
 3894                  */
 3895         case PRIV_NETIPX_RESERVEDPORT:
 3896         case PRIV_NETIPX_RAW:
 3897 
 3898                 /*
 3899                  * NCP privileges.
 3900                  */
 3901         case PRIV_NETNCP:
 3902 
 3903                 /*
 3904                  * SMB privileges.
 3905                  */
 3906         case PRIV_NETSMB:
 3907 #endif
 3908 
 3909         /*
 3910          * No default: or deny here.
 3911          * In case of no permit fall through to next switch().
 3912          */
 3913                 if (cred->cr_prison->pr_flags & PR_VNET)
 3914                         return (0);
 3915         }
 3916 #endif /* VIMAGE */
 3917 
 3918         switch (priv) {
 3919 
 3920                 /*
 3921                  * Allow ktrace privileges for root in jail.
 3922                  */
 3923         case PRIV_KTRACE:
 3924 
 3925 #if 0
 3926                 /*
 3927                  * Allow jailed processes to configure audit identity and
 3928                  * submit audit records (login, etc).  In the future we may
 3929                  * want to further refine the relationship between audit and
 3930                  * jail.
 3931                  */
 3932         case PRIV_AUDIT_GETAUDIT:
 3933         case PRIV_AUDIT_SETAUDIT:
 3934         case PRIV_AUDIT_SUBMIT:
 3935 #endif
 3936 
 3937                 /*
 3938                  * Allow jailed processes to manipulate process UNIX
 3939                  * credentials in any way they see fit.
 3940                  */
 3941         case PRIV_CRED_SETUID:
 3942         case PRIV_CRED_SETEUID:
 3943         case PRIV_CRED_SETGID:
 3944         case PRIV_CRED_SETEGID:
 3945         case PRIV_CRED_SETGROUPS:
 3946         case PRIV_CRED_SETREUID:
 3947         case PRIV_CRED_SETREGID:
 3948         case PRIV_CRED_SETRESUID:
 3949         case PRIV_CRED_SETRESGID:
 3950 
 3951                 /*
 3952                  * Jail implements visibility constraints already, so allow
 3953                  * jailed root to override uid/gid-based constraints.
 3954                  */
 3955         case PRIV_SEEOTHERGIDS:
 3956         case PRIV_SEEOTHERUIDS:
 3957 
 3958                 /*
 3959                  * Jail implements inter-process debugging limits already, so
 3960                  * allow jailed root various debugging privileges.
 3961                  */
 3962         case PRIV_DEBUG_DIFFCRED:
 3963         case PRIV_DEBUG_SUGID:
 3964         case PRIV_DEBUG_UNPRIV:
 3965 
 3966                 /*
 3967                  * Allow jail to set various resource limits and login
 3968                  * properties, and for now, exceed process resource limits.
 3969                  */
 3970         case PRIV_PROC_LIMIT:
 3971         case PRIV_PROC_SETLOGIN:
 3972         case PRIV_PROC_SETRLIMIT:
 3973 
 3974                 /*
 3975                  * System V and POSIX IPC privileges are granted in jail.
 3976                  */
 3977         case PRIV_IPC_READ:
 3978         case PRIV_IPC_WRITE:
 3979         case PRIV_IPC_ADMIN:
 3980         case PRIV_IPC_MSGSIZE:
 3981         case PRIV_MQ_ADMIN:
 3982 
 3983                 /*
 3984                  * Jail operations within a jail work on child jails.
 3985                  */
 3986         case PRIV_JAIL_ATTACH:
 3987         case PRIV_JAIL_SET:
 3988         case PRIV_JAIL_REMOVE:
 3989 
 3990                 /*
 3991                  * Jail implements its own inter-process limits, so allow
 3992                  * root processes in jail to change scheduling on other
 3993                  * processes in the same jail.  Likewise for signalling.
 3994                  */
 3995         case PRIV_SCHED_DIFFCRED:
 3996         case PRIV_SCHED_CPUSET:
 3997         case PRIV_SIGNAL_DIFFCRED:
 3998         case PRIV_SIGNAL_SUGID:
 3999 
 4000                 /*
 4001                  * Allow jailed processes to write to sysctls marked as jail
 4002                  * writable.
 4003                  */
 4004         case PRIV_SYSCTL_WRITEJAIL:
 4005 
 4006                 /*
 4007                  * Allow root in jail to manage a variety of quota
 4008                  * properties.  These should likely be conditional on a
 4009                  * configuration option.
 4010                  */
 4011         case PRIV_VFS_GETQUOTA:
 4012         case PRIV_VFS_SETQUOTA:
 4013 
 4014                 /*
 4015                  * Since Jail relies on chroot() to implement file system
 4016                  * protections, grant many VFS privileges to root in jail.
 4017                  * Be careful to exclude mount-related and NFS-related
 4018                  * privileges.
 4019                  */
 4020         case PRIV_VFS_READ:
 4021         case PRIV_VFS_WRITE:
 4022         case PRIV_VFS_ADMIN:
 4023         case PRIV_VFS_EXEC:
 4024         case PRIV_VFS_LOOKUP:
 4025         case PRIV_VFS_BLOCKRESERVE:     /* XXXRW: Slightly surprising. */
 4026         case PRIV_VFS_CHFLAGS_DEV:
 4027         case PRIV_VFS_CHOWN:
 4028         case PRIV_VFS_CHROOT:
 4029         case PRIV_VFS_RETAINSUGID:
 4030         case PRIV_VFS_FCHROOT:
 4031         case PRIV_VFS_LINK:
 4032         case PRIV_VFS_SETGID:
 4033         case PRIV_VFS_STAT:
 4034         case PRIV_VFS_STICKYFILE:
 4035 
 4036                 /*
 4037                  * As in the non-jail case, non-root users are expected to be
 4038                  * able to read kernel/phyiscal memory (provided /dev/[k]mem
 4039                  * exists in the jail and they have permission to access it).
 4040                  */
 4041         case PRIV_KMEM_READ:
 4042                 return (0);
 4043 
 4044                 /*
 4045                  * Depending on the global setting, allow privilege of
 4046                  * setting system flags.
 4047                  */
 4048         case PRIV_VFS_SYSFLAGS:
 4049                 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
 4050                         return (0);
 4051                 else
 4052                         return (EPERM);
 4053 
 4054                 /*
 4055                  * Depending on the global setting, allow privilege of
 4056                  * mounting/unmounting file systems.
 4057                  */
 4058         case PRIV_VFS_MOUNT:
 4059         case PRIV_VFS_UNMOUNT:
 4060         case PRIV_VFS_MOUNT_NONUSER:
 4061         case PRIV_VFS_MOUNT_OWNER:
 4062                 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
 4063                     cred->cr_prison->pr_enforce_statfs < 2)
 4064                         return (0);
 4065                 else
 4066                         return (EPERM);
 4067 
 4068                 /*
 4069                  * Allow jailed root to bind reserved ports and reuse in-use
 4070                  * ports.
 4071                  */
 4072         case PRIV_NETINET_RESERVEDPORT:
 4073         case PRIV_NETINET_REUSEPORT:
 4074                 return (0);
 4075 
 4076                 /*
 4077                  * Allow jailed root to set certain IPv4/6 (option) headers.
 4078                  */
 4079         case PRIV_NETINET_SETHDROPTS:
 4080                 return (0);
 4081 
 4082                 /*
 4083                  * Conditionally allow creating raw sockets in jail.
 4084                  */
 4085         case PRIV_NETINET_RAW:
 4086                 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
 4087                         return (0);
 4088                 else
 4089                         return (EPERM);
 4090 
 4091                 /*
 4092                  * Since jail implements its own visibility limits on netstat
 4093                  * sysctls, allow getcred.  This allows identd to work in
 4094                  * jail.
 4095                  */
 4096         case PRIV_NETINET_GETCRED:
 4097                 return (0);
 4098 
 4099                 /*
 4100                  * Allow jailed root to set loginclass.
 4101                  */
 4102         case PRIV_PROC_SETLOGINCLASS:
 4103                 return (0);
 4104 
 4105         default:
 4106                 /*
 4107                  * In all remaining cases, deny the privilege request.  This
 4108                  * includes almost all network privileges, many system
 4109                  * configuration privileges.
 4110                  */
 4111                 return (EPERM);
 4112         }
 4113 }
 4114 
 4115 /*
 4116  * Return the part of pr2's name that is relative to pr1, or the whole name
 4117  * if it does not directly follow.
 4118  */
 4119 
 4120 char *
 4121 prison_name(struct prison *pr1, struct prison *pr2)
 4122 {
 4123         char *name;
 4124 
 4125         /* Jails see themselves as "" (if they see themselves at all). */
 4126         if (pr1 == pr2)
 4127                 return "";
 4128         name = pr2->pr_name;
 4129         if (prison_ischild(pr1, pr2)) {
 4130                 /*
 4131                  * pr1 isn't locked (and allprison_lock may not be either)
 4132                  * so its length can't be counted on.  But the number of dots
 4133                  * can be counted on - and counted.
 4134                  */
 4135                 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
 4136                         name = strchr(name, '.') + 1;
 4137         }
 4138         return (name);
 4139 }
 4140 
 4141 /*
 4142  * Return the part of pr2's path that is relative to pr1, or the whole path
 4143  * if it does not directly follow.
 4144  */
 4145 static char *
 4146 prison_path(struct prison *pr1, struct prison *pr2)
 4147 {
 4148         char *path1, *path2;
 4149         int len1;
 4150 
 4151         path1 = pr1->pr_path;
 4152         path2 = pr2->pr_path;
 4153         if (!strcmp(path1, "/"))
 4154                 return (path2);
 4155         len1 = strlen(path1);
 4156         if (strncmp(path1, path2, len1))
 4157                 return (path2);
 4158         if (path2[len1] == '\0')
 4159                 return "/";
 4160         if (path2[len1] == '/')
 4161                 return (path2 + len1);
 4162         return (path2);
 4163 }
 4164 
 4165 
 4166 /*
 4167  * Jail-related sysctls.
 4168  */
 4169 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
 4170     "Jails");
 4171 
 4172 static int
 4173 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
 4174 {
 4175         struct xprison *xp;
 4176         struct prison *pr, *cpr;
 4177 #ifdef INET
 4178         struct in_addr *ip4 = NULL;
 4179         int ip4s = 0;
 4180 #endif
 4181 #ifdef INET6
 4182         struct in6_addr *ip6 = NULL;
 4183         int ip6s = 0;
 4184 #endif
 4185         int descend, error;
 4186 
 4187         xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
 4188         pr = req->td->td_ucred->cr_prison;
 4189         error = 0;
 4190         sx_slock(&allprison_lock);
 4191         FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 4192 #if defined(INET) || defined(INET6)
 4193  again:
 4194 #endif
 4195                 mtx_lock(&cpr->pr_mtx);
 4196 #ifdef INET
 4197                 if (cpr->pr_ip4s > 0) {
 4198                         if (ip4s < cpr->pr_ip4s) {
 4199                                 ip4s = cpr->pr_ip4s;
 4200                                 mtx_unlock(&cpr->pr_mtx);
 4201                                 ip4 = realloc(ip4, ip4s *
 4202                                     sizeof(struct in_addr), M_TEMP, M_WAITOK);
 4203                                 goto again;
 4204                         }
 4205                         bcopy(cpr->pr_ip4, ip4,
 4206                             cpr->pr_ip4s * sizeof(struct in_addr));
 4207                 }
 4208 #endif
 4209 #ifdef INET6
 4210                 if (cpr->pr_ip6s > 0) {
 4211                         if (ip6s < cpr->pr_ip6s) {
 4212                                 ip6s = cpr->pr_ip6s;
 4213                                 mtx_unlock(&cpr->pr_mtx);
 4214                                 ip6 = realloc(ip6, ip6s *
 4215                                     sizeof(struct in6_addr), M_TEMP, M_WAITOK);
 4216                                 goto again;
 4217                         }
 4218                         bcopy(cpr->pr_ip6, ip6,
 4219                             cpr->pr_ip6s * sizeof(struct in6_addr));
 4220                 }
 4221 #endif
 4222                 if (cpr->pr_ref == 0) {
 4223                         mtx_unlock(&cpr->pr_mtx);
 4224                         continue;
 4225                 }
 4226                 bzero(xp, sizeof(*xp));
 4227                 xp->pr_version = XPRISON_VERSION;
 4228                 xp->pr_id = cpr->pr_id;
 4229                 xp->pr_state = cpr->pr_uref > 0
 4230                     ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
 4231                 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
 4232                 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
 4233                 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
 4234 #ifdef INET
 4235                 xp->pr_ip4s = cpr->pr_ip4s;
 4236 #endif
 4237 #ifdef INET6
 4238                 xp->pr_ip6s = cpr->pr_ip6s;
 4239 #endif
 4240                 mtx_unlock(&cpr->pr_mtx);
 4241                 error = SYSCTL_OUT(req, xp, sizeof(*xp));
 4242                 if (error)
 4243                         break;
 4244 #ifdef INET
 4245                 if (xp->pr_ip4s > 0) {
 4246                         error = SYSCTL_OUT(req, ip4,
 4247                             xp->pr_ip4s * sizeof(struct in_addr));
 4248                         if (error)
 4249                                 break;
 4250                 }
 4251 #endif
 4252 #ifdef INET6
 4253                 if (xp->pr_ip6s > 0) {
 4254                         error = SYSCTL_OUT(req, ip6,
 4255                             xp->pr_ip6s * sizeof(struct in6_addr));
 4256                         if (error)
 4257                                 break;
 4258                 }
 4259 #endif
 4260         }
 4261         sx_sunlock(&allprison_lock);
 4262         free(xp, M_TEMP);
 4263 #ifdef INET
 4264         free(ip4, M_TEMP);
 4265 #endif
 4266 #ifdef INET6
 4267         free(ip6, M_TEMP);
 4268 #endif
 4269         return (error);
 4270 }
 4271 
 4272 SYSCTL_OID(_security_jail, OID_AUTO, list,
 4273     CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4274     sysctl_jail_list, "S", "List of active jails");
 4275 
 4276 static int
 4277 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
 4278 {
 4279         int error, injail;
 4280 
 4281         injail = jailed(req->td->td_ucred);
 4282         error = SYSCTL_OUT(req, &injail, sizeof(injail));
 4283 
 4284         return (error);
 4285 }
 4286 
 4287 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
 4288     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4289     sysctl_jail_jailed, "I", "Process in jail?");
 4290 
 4291 static int
 4292 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
 4293 {
 4294         int error, havevnet;
 4295 #ifdef VIMAGE
 4296         struct ucred *cred = req->td->td_ucred;
 4297 
 4298         havevnet = jailed(cred) && prison_owns_vnet(cred);
 4299 #else
 4300         havevnet = 0;
 4301 #endif
 4302         error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
 4303 
 4304         return (error);
 4305 }
 4306 
 4307 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
 4308     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4309     sysctl_jail_vnet, "I", "Jail owns VNET?");
 4310 
 4311 #if defined(INET) || defined(INET6)
 4312 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
 4313     &jail_max_af_ips, 0,
 4314     "Number of IP addresses a jail may have at most per address family (deprecated)");
 4315 #endif
 4316 
 4317 /*
 4318  * Default parameters for jail(2) compatibility.  For historical reasons,
 4319  * the sysctl names have varying similarity to the parameter names.  Prisons
 4320  * just see their own parameters, and can't change them.
 4321  */
 4322 static int
 4323 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
 4324 {
 4325         struct prison *pr;
 4326         int allow, error, i;
 4327 
 4328         pr = req->td->td_ucred->cr_prison;
 4329         allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
 4330 
 4331         /* Get the current flag value, and convert it to a boolean. */
 4332         i = (allow & arg2) ? 1 : 0;
 4333         if (arg1 != NULL)
 4334                 i = !i;
 4335         error = sysctl_handle_int(oidp, &i, 0, req);
 4336         if (error || !req->newptr)
 4337                 return (error);
 4338         i = i ? arg2 : 0;
 4339         if (arg1 != NULL)
 4340                 i ^= arg2;
 4341         /*
 4342          * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
 4343          * for writing.
 4344          */
 4345         mtx_lock(&prison0.pr_mtx);
 4346         jail_default_allow = (jail_default_allow & ~arg2) | i;
 4347         mtx_unlock(&prison0.pr_mtx);
 4348         return (0);
 4349 }
 4350 
 4351 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
 4352     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4353     NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
 4354     "Processes in jail can set their hostnames (deprecated)");
 4355 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
 4356     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4357     (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
 4358     "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
 4359 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
 4360     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4361     NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
 4362     "Processes in jail can use System V IPC primitives (deprecated)");
 4363 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
 4364     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4365     NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
 4366     "Prison root can create raw sockets (deprecated)");
 4367 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
 4368     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4369     NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
 4370     "Processes in jail can alter system file flags (deprecated)");
 4371 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
 4372     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4373     NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
 4374     "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
 4375 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
 4376     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4377     NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
 4378     "Processes in jail can mount the devfs file system (deprecated)");
 4379 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed,
 4380     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4381     NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I",
 4382     "Processes in jail can mount the fdescfs file system (deprecated)");
 4383 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
 4384     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4385     NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
 4386     "Processes in jail can mount the nullfs file system (deprecated)");
 4387 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
 4388     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4389     NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
 4390     "Processes in jail can mount the procfs file system (deprecated)");
 4391 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
 4392     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4393     NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
 4394     "Processes in jail can mount the linprocfs file system (deprecated)");
 4395 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
 4396     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4397     NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
 4398     "Processes in jail can mount the linsysfs file system (deprecated)");
 4399 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
 4400     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4401     NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
 4402     "Processes in jail can mount the tmpfs file system (deprecated)");
 4403 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
 4404     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4405     NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
 4406     "Processes in jail can mount the zfs file system (deprecated)");
 4407 
 4408 static int
 4409 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
 4410 {
 4411         struct prison *pr;
 4412         int level, error;
 4413 
 4414         pr = req->td->td_ucred->cr_prison;
 4415         level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
 4416         error = sysctl_handle_int(oidp, &level, 0, req);
 4417         if (error || !req->newptr)
 4418                 return (error);
 4419         *(int *)arg1 = level;
 4420         return (0);
 4421 }
 4422 
 4423 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
 4424     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4425     &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
 4426     sysctl_jail_default_level, "I",
 4427     "Processes in jail cannot see all mounted file systems (deprecated)");
 4428 
 4429 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
 4430     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
 4431     &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
 4432     sysctl_jail_default_level, "I",
 4433     "Ruleset for the devfs filesystem in jail (deprecated)");
 4434 
 4435 /*
 4436  * Nodes to describe jail parameters.  Maximum length of string parameters
 4437  * is returned in the string itself, and the other parameters exist merely
 4438  * to make themselves and their types known.
 4439  */
 4440 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
 4441     "Jail parameters");
 4442 
 4443 int
 4444 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
 4445 {
 4446         int i;
 4447         long l;
 4448         size_t s;
 4449         char numbuf[12];
 4450 
 4451         switch (oidp->oid_kind & CTLTYPE)
 4452         {
 4453         case CTLTYPE_LONG:
 4454         case CTLTYPE_ULONG:
 4455                 l = 0;
 4456 #ifdef SCTL_MASK32
 4457                 if (!(req->flags & SCTL_MASK32))
 4458 #endif
 4459                         return (SYSCTL_OUT(req, &l, sizeof(l)));
 4460         case CTLTYPE_INT:
 4461         case CTLTYPE_UINT:
 4462                 i = 0;
 4463                 return (SYSCTL_OUT(req, &i, sizeof(i)));
 4464         case CTLTYPE_STRING:
 4465                 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
 4466                 return
 4467                     (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
 4468         case CTLTYPE_STRUCT:
 4469                 s = (size_t)arg2;
 4470                 return (SYSCTL_OUT(req, &s, sizeof(s)));
 4471         }
 4472         return (0);
 4473 }
 4474 
 4475 /*
 4476  * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
 4477  * jail creation time but cannot be changed in an existing jail.
 4478  */
 4479 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
 4480 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
 4481 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
 4482 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
 4483 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
 4484     "I", "Jail secure level");
 4485 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 
 4486     "Jail value for kern.osreldate and uname -K");
 4487 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 
 4488     "Jail value for kern.osrelease and uname -r");
 4489 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
 4490     "I", "Jail cannot see all mounted file systems");
 4491 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
 4492     "I", "Ruleset for in-jail devfs mounts");
 4493 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
 4494     "B", "Jail persistence");
 4495 #ifdef VIMAGE
 4496 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
 4497     "E,jailsys", "Virtual network stack");
 4498 #endif
 4499 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
 4500     "B", "Jail is in the process of shutting down");
 4501 
 4502 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
 4503 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
 4504     "I", "Current number of child jails");
 4505 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
 4506     "I", "Maximum number of child jails");
 4507 
 4508 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
 4509 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4510     "Jail hostname");
 4511 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4512     "Jail NIS domainname");
 4513 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
 4514     "Jail host UUID");
 4515 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
 4516     "LU", "Jail host ID");
 4517 
 4518 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
 4519 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
 4520 
 4521 #ifdef INET
 4522 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
 4523     "Jail IPv4 address virtualization");
 4524 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
 4525     "S,in_addr,a", "Jail IPv4 addresses");
 4526 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4527     "B", "Do (not) use IPv4 source address selection rather than the "
 4528     "primary jail IPv4 address.");
 4529 #endif
 4530 #ifdef INET6
 4531 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
 4532     "Jail IPv6 address virtualization");
 4533 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
 4534     "S,in6_addr,a", "Jail IPv6 addresses");
 4535 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4536     "B", "Do (not) use IPv6 source address selection rather than the "
 4537     "primary jail IPv6 address.");
 4538 #endif
 4539 
 4540 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
 4541 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
 4542     "B", "Jail may set hostname");
 4543 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
 4544     "B", "Jail may use SYSV IPC");
 4545 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
 4546     "B", "Jail may create raw sockets");
 4547 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
 4548     "B", "Jail may alter system file flags");
 4549 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
 4550     "B", "Jail may set file quotas");
 4551 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
 4552     "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
 4553 
 4554 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
 4555 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
 4556     "B", "Jail may mount/unmount jail-friendly file systems in general");
 4557 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
 4558     "B", "Jail may mount the devfs file system");
 4559 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW,
 4560     "B", "Jail may mount the fdescfs file system");
 4561 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
 4562     "B", "Jail may mount the nullfs file system");
 4563 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
 4564     "B", "Jail may mount the procfs file system");
 4565 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
 4566     "B", "Jail may mount the linprocfs file system");
 4567 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
 4568     "B", "Jail may mount the linsysfs file system");
 4569 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
 4570     "B", "Jail may mount the tmpfs file system");
 4571 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
 4572     "B", "Jail may mount the zfs file system");
 4573 
 4574 #ifdef RACCT
 4575 void
 4576 prison_racct_foreach(void (*callback)(struct racct *racct,
 4577     void *arg2, void *arg3), void *arg2, void *arg3)
 4578 {
 4579         struct prison_racct *prr;
 4580 
 4581         ASSERT_RACCT_ENABLED();
 4582 
 4583         sx_slock(&allprison_lock);
 4584         LIST_FOREACH(prr, &allprison_racct, prr_next)
 4585                 (callback)(prr->prr_racct, arg2, arg3);
 4586         sx_sunlock(&allprison_lock);
 4587 }
 4588 
 4589 static struct prison_racct *
 4590 prison_racct_find_locked(const char *name)
 4591 {
 4592         struct prison_racct *prr;
 4593 
 4594         ASSERT_RACCT_ENABLED();
 4595         sx_assert(&allprison_lock, SA_XLOCKED);
 4596 
 4597         if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
 4598                 return (NULL);
 4599 
 4600         LIST_FOREACH(prr, &allprison_racct, prr_next) {
 4601                 if (strcmp(name, prr->prr_name) != 0)
 4602                         continue;
 4603 
 4604                 /* Found prison_racct with a matching name? */
 4605                 prison_racct_hold(prr);
 4606                 return (prr);
 4607         }
 4608 
 4609         /* Add new prison_racct. */
 4610         prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
 4611         racct_create(&prr->prr_racct);
 4612 
 4613         strcpy(prr->prr_name, name);
 4614         refcount_init(&prr->prr_refcount, 1);
 4615         LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
 4616 
 4617         return (prr);
 4618 }
 4619 
 4620 struct prison_racct *
 4621 prison_racct_find(const char *name)
 4622 {
 4623         struct prison_racct *prr;
 4624 
 4625         ASSERT_RACCT_ENABLED();
 4626 
 4627         sx_xlock(&allprison_lock);
 4628         prr = prison_racct_find_locked(name);
 4629         sx_xunlock(&allprison_lock);
 4630         return (prr);
 4631 }
 4632 
 4633 void
 4634 prison_racct_hold(struct prison_racct *prr)
 4635 {
 4636 
 4637         ASSERT_RACCT_ENABLED();
 4638 
 4639         refcount_acquire(&prr->prr_refcount);
 4640 }
 4641 
 4642 static void
 4643 prison_racct_free_locked(struct prison_racct *prr)
 4644 {
 4645 
 4646         ASSERT_RACCT_ENABLED();
 4647         sx_assert(&allprison_lock, SA_XLOCKED);
 4648 
 4649         if (refcount_release(&prr->prr_refcount)) {
 4650                 racct_destroy(&prr->prr_racct);
 4651                 LIST_REMOVE(prr, prr_next);
 4652                 free(prr, M_PRISON_RACCT);
 4653         }
 4654 }
 4655 
 4656 void
 4657 prison_racct_free(struct prison_racct *prr)
 4658 {
 4659         int old;
 4660 
 4661         ASSERT_RACCT_ENABLED();
 4662         sx_assert(&allprison_lock, SA_UNLOCKED);
 4663 
 4664         old = prr->prr_refcount;
 4665         if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
 4666                 return;
 4667 
 4668         sx_xlock(&allprison_lock);
 4669         prison_racct_free_locked(prr);
 4670         sx_xunlock(&allprison_lock);
 4671 }
 4672 
 4673 static void
 4674 prison_racct_attach(struct prison *pr)
 4675 {
 4676         struct prison_racct *prr;
 4677 
 4678         ASSERT_RACCT_ENABLED();
 4679         sx_assert(&allprison_lock, SA_XLOCKED);
 4680 
 4681         prr = prison_racct_find_locked(pr->pr_name);
 4682         KASSERT(prr != NULL, ("cannot find prison_racct"));
 4683 
 4684         pr->pr_prison_racct = prr;
 4685 }
 4686 
 4687 /*
 4688  * Handle jail renaming.  From the racct point of view, renaming means
 4689  * moving from one prison_racct to another.
 4690  */
 4691 static void
 4692 prison_racct_modify(struct prison *pr)
 4693 {
 4694         struct proc *p;
 4695         struct ucred *cred;
 4696         struct prison_racct *oldprr;
 4697 
 4698         ASSERT_RACCT_ENABLED();
 4699 
 4700         sx_slock(&allproc_lock);
 4701         sx_xlock(&allprison_lock);
 4702 
 4703         if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
 4704                 sx_xunlock(&allprison_lock);
 4705                 sx_sunlock(&allproc_lock);
 4706                 return;
 4707         }
 4708 
 4709         oldprr = pr->pr_prison_racct;
 4710         pr->pr_prison_racct = NULL;
 4711 
 4712         prison_racct_attach(pr);
 4713 
 4714         /*
 4715          * Move resource utilisation records.
 4716          */
 4717         racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
 4718 
 4719         /*
 4720          * Force rctl to reattach rules to processes.
 4721          */
 4722         FOREACH_PROC_IN_SYSTEM(p) {
 4723                 PROC_LOCK(p);
 4724                 cred = crhold(p->p_ucred);
 4725                 PROC_UNLOCK(p);
 4726                 racct_proc_ucred_changed(p, cred, cred);
 4727                 crfree(cred);
 4728         }
 4729 
 4730         sx_sunlock(&allproc_lock);
 4731         prison_racct_free_locked(oldprr);
 4732         sx_xunlock(&allprison_lock);
 4733 }
 4734 
 4735 static void
 4736 prison_racct_detach(struct prison *pr)
 4737 {
 4738 
 4739         ASSERT_RACCT_ENABLED();
 4740         sx_assert(&allprison_lock, SA_UNLOCKED);
 4741 
 4742         if (pr->pr_prison_racct == NULL)
 4743                 return;
 4744         prison_racct_free(pr->pr_prison_racct);
 4745         pr->pr_prison_racct = NULL;
 4746 }
 4747 #endif /* RACCT */
 4748 
 4749 #ifdef DDB
 4750 
 4751 static void
 4752 db_show_prison(struct prison *pr)
 4753 {
 4754         int fi;
 4755 #if defined(INET) || defined(INET6)
 4756         int ii;
 4757 #endif
 4758         unsigned jsf;
 4759 #ifdef INET6
 4760         char ip6buf[INET6_ADDRSTRLEN];
 4761 #endif
 4762 
 4763         db_printf("prison %p:\n", pr);
 4764         db_printf(" jid             = %d\n", pr->pr_id);
 4765         db_printf(" name            = %s\n", pr->pr_name);
 4766         db_printf(" parent          = %p\n", pr->pr_parent);
 4767         db_printf(" ref             = %d\n", pr->pr_ref);
 4768         db_printf(" uref            = %d\n", pr->pr_uref);
 4769         db_printf(" path            = %s\n", pr->pr_path);
 4770         db_printf(" cpuset          = %d\n", pr->pr_cpuset
 4771             ? pr->pr_cpuset->cs_id : -1);
 4772 #ifdef VIMAGE
 4773         db_printf(" vnet            = %p\n", pr->pr_vnet);
 4774 #endif
 4775         db_printf(" root            = %p\n", pr->pr_root);
 4776         db_printf(" securelevel     = %d\n", pr->pr_securelevel);
 4777         db_printf(" devfs_rsnum     = %d\n", pr->pr_devfs_rsnum);
 4778         db_printf(" children.max    = %d\n", pr->pr_childmax);
 4779         db_printf(" children.cur    = %d\n", pr->pr_childcount);
 4780         db_printf(" child           = %p\n", LIST_FIRST(&pr->pr_children));
 4781         db_printf(" sibling         = %p\n", LIST_NEXT(pr, pr_sibling));
 4782         db_printf(" flags           = 0x%x", pr->pr_flags);
 4783         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 4784             fi++)
 4785                 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
 4786                         db_printf(" %s", pr_flag_names[fi]);
 4787         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 4788             fi++) {
 4789                 jsf = pr->pr_flags &
 4790                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 4791                 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
 4792                     pr_flag_jailsys[fi].disable && 
 4793                       (jsf == pr_flag_jailsys[fi].disable) ? "disable"
 4794                     : (jsf == pr_flag_jailsys[fi].new) ? "new"
 4795                     : "inherit");
 4796         }
 4797         db_printf(" allow           = 0x%x", pr->pr_allow);
 4798         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 4799             fi++)
 4800                 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
 4801                         db_printf(" %s", pr_allow_names[fi]);
 4802         db_printf("\n");
 4803         db_printf(" enforce_statfs  = %d\n", pr->pr_enforce_statfs);
 4804         db_printf(" host.hostname   = %s\n", pr->pr_hostname);
 4805         db_printf(" host.domainname = %s\n", pr->pr_domainname);
 4806         db_printf(" host.hostuuid   = %s\n", pr->pr_hostuuid);
 4807         db_printf(" host.hostid     = %lu\n", pr->pr_hostid);
 4808 #ifdef INET
 4809         db_printf(" ip4s            = %d\n", pr->pr_ip4s);
 4810         for (ii = 0; ii < pr->pr_ip4s; ii++)
 4811                 db_printf(" %s %s\n",
 4812                     ii == 0 ? "ip4.addr        =" : "                 ",
 4813                     inet_ntoa(pr->pr_ip4[ii]));
 4814 #endif
 4815 #ifdef INET6
 4816         db_printf(" ip6s            = %d\n", pr->pr_ip6s);
 4817         for (ii = 0; ii < pr->pr_ip6s; ii++)
 4818                 db_printf(" %s %s\n",
 4819                     ii == 0 ? "ip6.addr        =" : "                 ",
 4820                     ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
 4821 #endif
 4822 }
 4823 
 4824 DB_SHOW_COMMAND(prison, db_show_prison_command)
 4825 {
 4826         struct prison *pr;
 4827 
 4828         if (!have_addr) {
 4829                 /*
 4830                  * Show all prisons in the list, and prison0 which is not
 4831                  * listed.
 4832                  */
 4833                 db_show_prison(&prison0);
 4834                 if (!db_pager_quit) {
 4835                         TAILQ_FOREACH(pr, &allprison, pr_list) {
 4836                                 db_show_prison(pr);
 4837                                 if (db_pager_quit)
 4838                                         break;
 4839                         }
 4840                 }
 4841                 return;
 4842         }
 4843 
 4844         if (addr == 0)
 4845                 pr = &prison0;
 4846         else {
 4847                 /* Look for a prison with the ID and with references. */
 4848                 TAILQ_FOREACH(pr, &allprison, pr_list)
 4849                         if (pr->pr_id == addr && pr->pr_ref > 0)
 4850                                 break;
 4851                 if (pr == NULL)
 4852                         /* Look again, without requiring a reference. */
 4853                         TAILQ_FOREACH(pr, &allprison, pr_list)
 4854                                 if (pr->pr_id == addr)
 4855                                         break;
 4856                 if (pr == NULL)
 4857                         /* Assume address points to a valid prison. */
 4858                         pr = (struct prison *)addr;
 4859         }
 4860         db_show_prison(pr);
 4861 }
 4862 
 4863 #endif /* DDB */

Cache object: 352a52e6ec4c67d1235151500e2c5ab4


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.