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


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

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    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: releng/10.0/sys/kern/kern_jail.c 258929 2013-12-04 18:25:04Z peter $");
   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 };
  211 const size_t pr_allow_names_size = sizeof(pr_allow_names);
  212 
  213 static char *pr_allow_nonames[] = {
  214         "allow.noset_hostname",
  215         "allow.nosysvipc",
  216         "allow.noraw_sockets",
  217         "allow.nochflags",
  218         "allow.nomount",
  219         "allow.noquotas",
  220         "allow.nosocket_af",
  221         "allow.mount.nodevfs",
  222         "allow.mount.nonullfs",
  223         "allow.mount.nozfs",
  224         "allow.mount.noprocfs",
  225         "allow.mount.notmpfs",
  226 };
  227 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
  228 
  229 #define JAIL_DEFAULT_ALLOW              PR_ALLOW_SET_HOSTNAME
  230 #define JAIL_DEFAULT_ENFORCE_STATFS     2
  231 #define JAIL_DEFAULT_DEVFS_RSNUM        0
  232 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
  233 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
  234 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
  235 #if defined(INET) || defined(INET6)
  236 static unsigned jail_max_af_ips = 255;
  237 #endif
  238 
  239 #ifdef INET
  240 static int
  241 qcmp_v4(const void *ip1, const void *ip2)
  242 {
  243         in_addr_t iaa, iab;
  244 
  245         /*
  246          * We need to compare in HBO here to get the list sorted as expected
  247          * by the result of the code.  Sorting NBO addresses gives you
  248          * interesting results.  If you do not understand, do not try.
  249          */
  250         iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
  251         iab = ntohl(((const struct in_addr *)ip2)->s_addr);
  252 
  253         /*
  254          * Do not simply return the difference of the two numbers, the int is
  255          * not wide enough.
  256          */
  257         if (iaa > iab)
  258                 return (1);
  259         else if (iaa < iab)
  260                 return (-1);
  261         else
  262                 return (0);
  263 }
  264 #endif
  265 
  266 #ifdef INET6
  267 static int
  268 qcmp_v6(const void *ip1, const void *ip2)
  269 {
  270         const struct in6_addr *ia6a, *ia6b;
  271         int i, rc;
  272 
  273         ia6a = (const struct in6_addr *)ip1;
  274         ia6b = (const struct in6_addr *)ip2;
  275 
  276         rc = 0;
  277         for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
  278                 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
  279                         rc = 1;
  280                 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
  281                         rc = -1;
  282         }
  283         return (rc);
  284 }
  285 #endif
  286 
  287 /*
  288  * struct jail_args {
  289  *      struct jail *jail;
  290  * };
  291  */
  292 int
  293 sys_jail(struct thread *td, struct jail_args *uap)
  294 {
  295         uint32_t version;
  296         int error;
  297         struct jail j;
  298 
  299         error = copyin(uap->jail, &version, sizeof(uint32_t));
  300         if (error)
  301                 return (error);
  302 
  303         switch (version) {
  304         case 0:
  305         {
  306                 struct jail_v0 j0;
  307 
  308                 /* FreeBSD single IPv4 jails. */
  309                 bzero(&j, sizeof(struct jail));
  310                 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
  311                 if (error)
  312                         return (error);
  313                 j.version = j0.version;
  314                 j.path = j0.path;
  315                 j.hostname = j0.hostname;
  316                 j.ip4s = htonl(j0.ip_number);   /* jail_v0 is host order */
  317                 break;
  318         }
  319 
  320         case 1:
  321                 /*
  322                  * Version 1 was used by multi-IPv4 jail implementations
  323                  * that never made it into the official kernel.
  324                  */
  325                 return (EINVAL);
  326 
  327         case 2: /* JAIL_API_VERSION */
  328                 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
  329                 error = copyin(uap->jail, &j, sizeof(struct jail));
  330                 if (error)
  331                         return (error);
  332                 break;
  333 
  334         default:
  335                 /* Sci-Fi jails are not supported, sorry. */
  336                 return (EINVAL);
  337         }
  338         return (kern_jail(td, &j));
  339 }
  340 
  341 int
  342 kern_jail(struct thread *td, struct jail *j)
  343 {
  344         struct iovec optiov[2 * (4
  345                             + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
  346 #ifdef INET
  347                             + 1
  348 #endif
  349 #ifdef INET6
  350                             + 1
  351 #endif
  352                             )];
  353         struct uio opt;
  354         char *u_path, *u_hostname, *u_name;
  355 #ifdef INET
  356         uint32_t ip4s;
  357         struct in_addr *u_ip4;
  358 #endif
  359 #ifdef INET6
  360         struct in6_addr *u_ip6;
  361 #endif
  362         size_t tmplen;
  363         int error, enforce_statfs, fi;
  364 
  365         bzero(&optiov, sizeof(optiov));
  366         opt.uio_iov = optiov;
  367         opt.uio_iovcnt = 0;
  368         opt.uio_offset = -1;
  369         opt.uio_resid = -1;
  370         opt.uio_segflg = UIO_SYSSPACE;
  371         opt.uio_rw = UIO_READ;
  372         opt.uio_td = td;
  373 
  374         /* Set permissions for top-level jails from sysctls. */
  375         if (!jailed(td->td_ucred)) {
  376                 for (fi = 0; fi < sizeof(pr_allow_names) /
  377                      sizeof(pr_allow_names[0]); fi++) {
  378                         optiov[opt.uio_iovcnt].iov_base =
  379                             (jail_default_allow & (1 << fi))
  380                             ? pr_allow_names[fi] : pr_allow_nonames[fi];
  381                         optiov[opt.uio_iovcnt].iov_len =
  382                             strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
  383                         opt.uio_iovcnt += 2;
  384                 }
  385                 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
  386                 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
  387                 opt.uio_iovcnt++;
  388                 enforce_statfs = jail_default_enforce_statfs;
  389                 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
  390                 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
  391                 opt.uio_iovcnt++;
  392         }
  393 
  394         tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
  395 #ifdef INET
  396         ip4s = (j->version == 0) ? 1 : j->ip4s;
  397         if (ip4s > jail_max_af_ips)
  398                 return (EINVAL);
  399         tmplen += ip4s * sizeof(struct in_addr);
  400 #else
  401         if (j->ip4s > 0)
  402                 return (EINVAL);
  403 #endif
  404 #ifdef INET6
  405         if (j->ip6s > jail_max_af_ips)
  406                 return (EINVAL);
  407         tmplen += j->ip6s * sizeof(struct in6_addr);
  408 #else
  409         if (j->ip6s > 0)
  410                 return (EINVAL);
  411 #endif
  412         u_path = malloc(tmplen, M_TEMP, M_WAITOK);
  413         u_hostname = u_path + MAXPATHLEN;
  414         u_name = u_hostname + MAXHOSTNAMELEN;
  415 #ifdef INET
  416         u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
  417 #endif
  418 #ifdef INET6
  419 #ifdef INET
  420         u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
  421 #else
  422         u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
  423 #endif
  424 #endif
  425         optiov[opt.uio_iovcnt].iov_base = "path";
  426         optiov[opt.uio_iovcnt].iov_len = sizeof("path");
  427         opt.uio_iovcnt++;
  428         optiov[opt.uio_iovcnt].iov_base = u_path;
  429         error = copyinstr(j->path, u_path, MAXPATHLEN,
  430             &optiov[opt.uio_iovcnt].iov_len);
  431         if (error) {
  432                 free(u_path, M_TEMP);
  433                 return (error);
  434         }
  435         opt.uio_iovcnt++;
  436         optiov[opt.uio_iovcnt].iov_base = "host.hostname";
  437         optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
  438         opt.uio_iovcnt++;
  439         optiov[opt.uio_iovcnt].iov_base = u_hostname;
  440         error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
  441             &optiov[opt.uio_iovcnt].iov_len);
  442         if (error) {
  443                 free(u_path, M_TEMP);
  444                 return (error);
  445         }
  446         opt.uio_iovcnt++;
  447         if (j->jailname != NULL) {
  448                 optiov[opt.uio_iovcnt].iov_base = "name";
  449                 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
  450                 opt.uio_iovcnt++;
  451                 optiov[opt.uio_iovcnt].iov_base = u_name;
  452                 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
  453                     &optiov[opt.uio_iovcnt].iov_len);
  454                 if (error) {
  455                         free(u_path, M_TEMP);
  456                         return (error);
  457                 }
  458                 opt.uio_iovcnt++;
  459         }
  460 #ifdef INET
  461         optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
  462         optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
  463         opt.uio_iovcnt++;
  464         optiov[opt.uio_iovcnt].iov_base = u_ip4;
  465         optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
  466         if (j->version == 0)
  467                 u_ip4->s_addr = j->ip4s;
  468         else {
  469                 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
  470                 if (error) {
  471                         free(u_path, M_TEMP);
  472                         return (error);
  473                 }
  474         }
  475         opt.uio_iovcnt++;
  476 #endif
  477 #ifdef INET6
  478         optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
  479         optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
  480         opt.uio_iovcnt++;
  481         optiov[opt.uio_iovcnt].iov_base = u_ip6;
  482         optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
  483         error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
  484         if (error) {
  485                 free(u_path, M_TEMP);
  486                 return (error);
  487         }
  488         opt.uio_iovcnt++;
  489 #endif
  490         KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
  491             ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
  492         error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
  493         free(u_path, M_TEMP);
  494         return (error);
  495 }
  496 
  497 
  498 /*
  499  * struct jail_set_args {
  500  *      struct iovec *iovp;
  501  *      unsigned int iovcnt;
  502  *      int flags;
  503  * };
  504  */
  505 int
  506 sys_jail_set(struct thread *td, struct jail_set_args *uap)
  507 {
  508         struct uio *auio;
  509         int error;
  510 
  511         /* Check that we have an even number of iovecs. */
  512         if (uap->iovcnt & 1)
  513                 return (EINVAL);
  514 
  515         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
  516         if (error)
  517                 return (error);
  518         error = kern_jail_set(td, auio, uap->flags);
  519         free(auio, M_IOV);
  520         return (error);
  521 }
  522 
  523 int
  524 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
  525 {
  526         struct nameidata nd;
  527 #ifdef INET
  528         struct in_addr *ip4;
  529 #endif
  530 #ifdef INET6
  531         struct in6_addr *ip6;
  532 #endif
  533         struct vfsopt *opt;
  534         struct vfsoptlist *opts;
  535         struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
  536         struct vnode *root;
  537         char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
  538         char *g_path;
  539 #if defined(INET) || defined(INET6)
  540         struct prison *tppr;
  541         void *op;
  542 #endif
  543         unsigned long hid;
  544         size_t namelen, onamelen;
  545         int created, cuflags, descend, enforce, error, errmsg_len, errmsg_pos;
  546         int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
  547         int fi, jid, jsys, len, level;
  548         int childmax, rsnum, slevel;
  549         int fullpath_disabled;
  550 #if defined(INET) || defined(INET6)
  551         int ii, ij;
  552 #endif
  553 #ifdef INET
  554         int ip4s, redo_ip4;
  555 #endif
  556 #ifdef INET6
  557         int ip6s, redo_ip6;
  558 #endif
  559         uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
  560         unsigned tallow;
  561         char numbuf[12];
  562 
  563         error = priv_check(td, PRIV_JAIL_SET);
  564         if (!error && (flags & JAIL_ATTACH))
  565                 error = priv_check(td, PRIV_JAIL_ATTACH);
  566         if (error)
  567                 return (error);
  568         mypr = ppr = td->td_ucred->cr_prison;
  569         if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
  570                 return (EPERM);
  571         if (flags & ~JAIL_SET_MASK)
  572                 return (EINVAL);
  573 
  574         /*
  575          * Check all the parameters before committing to anything.  Not all
  576          * errors can be caught early, but we may as well try.  Also, this
  577          * takes care of some expensive stuff (path lookup) before getting
  578          * the allprison lock.
  579          *
  580          * XXX Jails are not filesystems, and jail parameters are not mount
  581          *     options.  But it makes more sense to re-use the vfsopt code
  582          *     than duplicate it under a different name.
  583          */
  584         error = vfs_buildopts(optuio, &opts);
  585         if (error)
  586                 return (error);
  587 #ifdef INET
  588         ip4 = NULL;
  589 #endif
  590 #ifdef INET6
  591         ip6 = NULL;
  592 #endif
  593         g_path = NULL;
  594 
  595         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
  596         if (error == ENOENT)
  597                 jid = 0;
  598         else if (error != 0)
  599                 goto done_free;
  600 
  601         error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
  602         if (error == ENOENT)
  603                 gotslevel = 0;
  604         else if (error != 0)
  605                 goto done_free;
  606         else
  607                 gotslevel = 1;
  608 
  609         error =
  610             vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
  611         if (error == ENOENT)
  612                 gotchildmax = 0;
  613         else if (error != 0)
  614                 goto done_free;
  615         else
  616                 gotchildmax = 1;
  617 
  618         error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
  619         if (error == ENOENT)
  620                 gotenforce = 0;
  621         else if (error != 0)
  622                 goto done_free;
  623         else if (enforce < 0 || enforce > 2) {
  624                 error = EINVAL;
  625                 goto done_free;
  626         } else
  627                 gotenforce = 1;
  628 
  629         error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
  630         if (error == ENOENT)
  631                 gotrsnum = 0;
  632         else if (error != 0)
  633                 goto done_free;
  634         else
  635                 gotrsnum = 1;
  636 
  637         pr_flags = ch_flags = 0;
  638         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
  639             fi++) {
  640                 if (pr_flag_names[fi] == NULL)
  641                         continue;
  642                 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
  643                 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
  644         }
  645         ch_flags |= pr_flags;
  646         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
  647             fi++) {
  648                 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
  649                     sizeof(jsys));
  650                 if (error == ENOENT)
  651                         continue;
  652                 if (error != 0)
  653                         goto done_free;
  654                 switch (jsys) {
  655                 case JAIL_SYS_DISABLE:
  656                         if (!pr_flag_jailsys[fi].disable) {
  657                                 error = EINVAL;
  658                                 goto done_free;
  659                         }
  660                         pr_flags |= pr_flag_jailsys[fi].disable;
  661                         break;
  662                 case JAIL_SYS_NEW:
  663                         pr_flags |= pr_flag_jailsys[fi].new;
  664                         break;
  665                 case JAIL_SYS_INHERIT:
  666                         break;
  667                 default:
  668                         error = EINVAL;
  669                         goto done_free;
  670                 }
  671                 ch_flags |=
  672                     pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
  673         }
  674         if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
  675             && !(pr_flags & PR_PERSIST)) {
  676                 error = EINVAL;
  677                 vfs_opterror(opts, "new jail must persist or attach");
  678                 goto done_errmsg;
  679         }
  680 #ifdef VIMAGE
  681         if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
  682                 error = EINVAL;
  683                 vfs_opterror(opts, "vnet cannot be changed after creation");
  684                 goto done_errmsg;
  685         }
  686 #endif
  687 #ifdef INET
  688         if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
  689                 error = EINVAL;
  690                 vfs_opterror(opts, "ip4 cannot be changed after creation");
  691                 goto done_errmsg;
  692         }
  693 #endif
  694 #ifdef INET6
  695         if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
  696                 error = EINVAL;
  697                 vfs_opterror(opts, "ip6 cannot be changed after creation");
  698                 goto done_errmsg;
  699         }
  700 #endif
  701 
  702         pr_allow = ch_allow = 0;
  703         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
  704             fi++) {
  705                 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
  706                 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
  707         }
  708         ch_allow |= pr_allow;
  709 
  710         error = vfs_getopt(opts, "name", (void **)&name, &len);
  711         if (error == ENOENT)
  712                 name = NULL;
  713         else if (error != 0)
  714                 goto done_free;
  715         else {
  716                 if (len == 0 || name[len - 1] != '\0') {
  717                         error = EINVAL;
  718                         goto done_free;
  719                 }
  720                 if (len > MAXHOSTNAMELEN) {
  721                         error = ENAMETOOLONG;
  722                         goto done_free;
  723                 }
  724         }
  725 
  726         error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
  727         if (error == ENOENT)
  728                 host = NULL;
  729         else if (error != 0)
  730                 goto done_free;
  731         else {
  732                 ch_flags |= PR_HOST;
  733                 pr_flags |= PR_HOST;
  734                 if (len == 0 || host[len - 1] != '\0') {
  735                         error = EINVAL;
  736                         goto done_free;
  737                 }
  738                 if (len > MAXHOSTNAMELEN) {
  739                         error = ENAMETOOLONG;
  740                         goto done_free;
  741                 }
  742         }
  743 
  744         error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
  745         if (error == ENOENT)
  746                 domain = NULL;
  747         else if (error != 0)
  748                 goto done_free;
  749         else {
  750                 ch_flags |= PR_HOST;
  751                 pr_flags |= PR_HOST;
  752                 if (len == 0 || domain[len - 1] != '\0') {
  753                         error = EINVAL;
  754                         goto done_free;
  755                 }
  756                 if (len > MAXHOSTNAMELEN) {
  757                         error = ENAMETOOLONG;
  758                         goto done_free;
  759                 }
  760         }
  761 
  762         error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
  763         if (error == ENOENT)
  764                 uuid = NULL;
  765         else if (error != 0)
  766                 goto done_free;
  767         else {
  768                 ch_flags |= PR_HOST;
  769                 pr_flags |= PR_HOST;
  770                 if (len == 0 || uuid[len - 1] != '\0') {
  771                         error = EINVAL;
  772                         goto done_free;
  773                 }
  774                 if (len > HOSTUUIDLEN) {
  775                         error = ENAMETOOLONG;
  776                         goto done_free;
  777                 }
  778         }
  779 
  780 #ifdef COMPAT_FREEBSD32
  781         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
  782                 uint32_t hid32;
  783 
  784                 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
  785                 hid = hid32;
  786         } else
  787 #endif
  788                 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
  789         if (error == ENOENT)
  790                 gothid = 0;
  791         else if (error != 0)
  792                 goto done_free;
  793         else {
  794                 gothid = 1;
  795                 ch_flags |= PR_HOST;
  796                 pr_flags |= PR_HOST;
  797         }
  798 
  799 #ifdef INET
  800         error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
  801         if (error == ENOENT)
  802                 ip4s = (pr_flags & PR_IP4_DISABLE) ? 0 : -1;
  803         else if (error != 0)
  804                 goto done_free;
  805         else if (ip4s & (sizeof(*ip4) - 1)) {
  806                 error = EINVAL;
  807                 goto done_free;
  808         } else {
  809                 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
  810                 if (ip4s == 0)
  811                         pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
  812                 else {
  813                         pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
  814                         ip4s /= sizeof(*ip4);
  815                         if (ip4s > jail_max_af_ips) {
  816                                 error = EINVAL;
  817                                 vfs_opterror(opts, "too many IPv4 addresses");
  818                                 goto done_errmsg;
  819                         }
  820                         ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
  821                         bcopy(op, ip4, ip4s * sizeof(*ip4));
  822                         /*
  823                          * IP addresses are all sorted but ip[0] to preserve
  824                          * the primary IP address as given from userland.
  825                          * This special IP is used for unbound outgoing
  826                          * connections as well for "loopback" traffic in case
  827                          * source address selection cannot find any more fitting
  828                          * address to connect from.
  829                          */
  830                         if (ip4s > 1)
  831                                 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
  832                         /*
  833                          * Check for duplicate addresses and do some simple
  834                          * zero and broadcast checks. If users give other bogus
  835                          * addresses it is their problem.
  836                          *
  837                          * We do not have to care about byte order for these
  838                          * checks so we will do them in NBO.
  839                          */
  840                         for (ii = 0; ii < ip4s; ii++) {
  841                                 if (ip4[ii].s_addr == INADDR_ANY ||
  842                                     ip4[ii].s_addr == INADDR_BROADCAST) {
  843                                         error = EINVAL;
  844                                         goto done_free;
  845                                 }
  846                                 if ((ii+1) < ip4s &&
  847                                     (ip4[0].s_addr == ip4[ii+1].s_addr ||
  848                                      ip4[ii].s_addr == ip4[ii+1].s_addr)) {
  849                                         error = EINVAL;
  850                                         goto done_free;
  851                                 }
  852                         }
  853                 }
  854         }
  855 #endif
  856 
  857 #ifdef INET6
  858         error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
  859         if (error == ENOENT)
  860                 ip6s = (pr_flags & PR_IP6_DISABLE) ? 0 : -1;
  861         else if (error != 0)
  862                 goto done_free;
  863         else if (ip6s & (sizeof(*ip6) - 1)) {
  864                 error = EINVAL;
  865                 goto done_free;
  866         } else {
  867                 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
  868                 if (ip6s == 0)
  869                         pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
  870                 else {
  871                         pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
  872                         ip6s /= sizeof(*ip6);
  873                         if (ip6s > jail_max_af_ips) {
  874                                 error = EINVAL;
  875                                 vfs_opterror(opts, "too many IPv6 addresses");
  876                                 goto done_errmsg;
  877                         }
  878                         ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
  879                         bcopy(op, ip6, ip6s * sizeof(*ip6));
  880                         if (ip6s > 1)
  881                                 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
  882                         for (ii = 0; ii < ip6s; ii++) {
  883                                 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
  884                                         error = EINVAL;
  885                                         goto done_free;
  886                                 }
  887                                 if ((ii+1) < ip6s &&
  888                                     (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
  889                                      IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
  890                                 {
  891                                         error = EINVAL;
  892                                         goto done_free;
  893                                 }
  894                         }
  895                 }
  896         }
  897 #endif
  898 
  899 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
  900         if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
  901                 error = EINVAL;
  902                 vfs_opterror(opts,
  903                     "vnet jails cannot have IP address restrictions");
  904                 goto done_errmsg;
  905         }
  906 #endif
  907 
  908         fullpath_disabled = 0;
  909         root = NULL;
  910         error = vfs_getopt(opts, "path", (void **)&path, &len);
  911         if (error == ENOENT)
  912                 path = NULL;
  913         else if (error != 0)
  914                 goto done_free;
  915         else {
  916                 if (flags & JAIL_UPDATE) {
  917                         error = EINVAL;
  918                         vfs_opterror(opts,
  919                             "path cannot be changed after creation");
  920                         goto done_errmsg;
  921                 }
  922                 if (len == 0 || path[len - 1] != '\0') {
  923                         error = EINVAL;
  924                         goto done_free;
  925                 }
  926                 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
  927                     path, td);
  928                 error = namei(&nd);
  929                 if (error)
  930                         goto done_free;
  931                 root = nd.ni_vp;
  932                 NDFREE(&nd, NDF_ONLY_PNBUF);
  933                 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
  934                 strlcpy(g_path, path, MAXPATHLEN);
  935                 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
  936                 if (error == 0)
  937                         path = g_path;
  938                 else if (error == ENODEV) {
  939                         /* proceed if sysctl debug.disablefullpath == 1 */
  940                         fullpath_disabled = 1;
  941                         if (len < 2 || (len == 2 && path[0] == '/'))
  942                                 path = NULL;
  943                 } else {
  944                         /* exit on other errors */
  945                         goto done_free;
  946                 }
  947                 if (root->v_type != VDIR) {
  948                         error = ENOTDIR;
  949                         vput(root);
  950                         goto done_free;
  951                 }
  952                 VOP_UNLOCK(root, 0);
  953                 if (fullpath_disabled) {
  954                         /* Leave room for a real-root full pathname. */
  955                         if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
  956                             ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
  957                                 error = ENAMETOOLONG;
  958                                 goto done_free;
  959                         }
  960                 }
  961         }
  962 
  963         /*
  964          * Grab the allprison lock before letting modules check their
  965          * parameters.  Once we have it, do not let go so we'll have a
  966          * consistent view of the OSD list.
  967          */
  968         sx_xlock(&allprison_lock);
  969         error = osd_jail_call(NULL, PR_METHOD_CHECK, opts);
  970         if (error)
  971                 goto done_unlock_list;
  972 
  973         /* By now, all parameters should have been noted. */
  974         TAILQ_FOREACH(opt, opts, link) {
  975                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
  976                         error = EINVAL;
  977                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
  978                         goto done_unlock_list;
  979                 }
  980         }
  981 
  982         /*
  983          * See if we are creating a new record or updating an existing one.
  984          * This abuses the file error codes ENOENT and EEXIST.
  985          */
  986         cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
  987         if (!cuflags) {
  988                 error = EINVAL;
  989                 vfs_opterror(opts, "no valid operation (create or update)");
  990                 goto done_unlock_list;
  991         }
  992         pr = NULL;
  993         namelc = NULL;
  994         if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
  995                 namelc = strrchr(name, '.');
  996                 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
  997                 if (*p != '\0')
  998                         jid = 0;
  999         }
 1000         if (jid != 0) {
 1001                 /*
 1002                  * See if a requested jid already exists.  There is an
 1003                  * information leak here if the jid exists but is not within
 1004                  * the caller's jail hierarchy.  Jail creators will get EEXIST
 1005                  * even though they cannot see the jail, and CREATE | UPDATE
 1006                  * will return ENOENT which is not normally a valid error.
 1007                  */
 1008                 if (jid < 0) {
 1009                         error = EINVAL;
 1010                         vfs_opterror(opts, "negative jid");
 1011                         goto done_unlock_list;
 1012                 }
 1013                 pr = prison_find(jid);
 1014                 if (pr != NULL) {
 1015                         ppr = pr->pr_parent;
 1016                         /* Create: jid must not exist. */
 1017                         if (cuflags == JAIL_CREATE) {
 1018                                 mtx_unlock(&pr->pr_mtx);
 1019                                 error = EEXIST;
 1020                                 vfs_opterror(opts, "jail %d already exists",
 1021                                     jid);
 1022                                 goto done_unlock_list;
 1023                         }
 1024                         if (!prison_ischild(mypr, pr)) {
 1025                                 mtx_unlock(&pr->pr_mtx);
 1026                                 pr = NULL;
 1027                         } else if (pr->pr_uref == 0) {
 1028                                 if (!(flags & JAIL_DYING)) {
 1029                                         mtx_unlock(&pr->pr_mtx);
 1030                                         error = ENOENT;
 1031                                         vfs_opterror(opts, "jail %d is dying",
 1032                                             jid);
 1033                                         goto done_unlock_list;
 1034                                 } else if ((flags & JAIL_ATTACH) ||
 1035                                     (pr_flags & PR_PERSIST)) {
 1036                                         /*
 1037                                          * A dying jail might be resurrected
 1038                                          * (via attach or persist), but first
 1039                                          * it must determine if another jail
 1040                                          * has claimed its name.  Accomplish
 1041                                          * this by implicitly re-setting the
 1042                                          * name.
 1043                                          */
 1044                                         if (name == NULL)
 1045                                                 name = prison_name(mypr, pr);
 1046                                 }
 1047                         }
 1048                 }
 1049                 if (pr == NULL) {
 1050                         /* Update: jid must exist. */
 1051                         if (cuflags == JAIL_UPDATE) {
 1052                                 error = ENOENT;
 1053                                 vfs_opterror(opts, "jail %d not found", jid);
 1054                                 goto done_unlock_list;
 1055                         }
 1056                 }
 1057         }
 1058         /*
 1059          * If the caller provided a name, look for a jail by that name.
 1060          * This has different semantics for creates and updates keyed by jid
 1061          * (where the name must not already exist in a different jail),
 1062          * and updates keyed by the name itself (where the name must exist
 1063          * because that is the jail being updated).
 1064          */
 1065         if (name != NULL) {
 1066                 namelc = strrchr(name, '.');
 1067                 if (namelc == NULL)
 1068                         namelc = name;
 1069                 else {
 1070                         /*
 1071                          * This is a hierarchical name.  Split it into the
 1072                          * parent and child names, and make sure the parent
 1073                          * exists or matches an already found jail.
 1074                          */
 1075                         *namelc = '\0';
 1076                         if (pr != NULL) {
 1077                                 if (strncmp(name, ppr->pr_name, namelc - name)
 1078                                     || ppr->pr_name[namelc - name] != '\0') {
 1079                                         mtx_unlock(&pr->pr_mtx);
 1080                                         error = EINVAL;
 1081                                         vfs_opterror(opts,
 1082                                             "cannot change jail's parent");
 1083                                         goto done_unlock_list;
 1084                                 }
 1085                         } else {
 1086                                 ppr = prison_find_name(mypr, name);
 1087                                 if (ppr == NULL) {
 1088                                         error = ENOENT;
 1089                                         vfs_opterror(opts,
 1090                                             "jail \"%s\" not found", name);
 1091                                         goto done_unlock_list;
 1092                                 }
 1093                                 mtx_unlock(&ppr->pr_mtx);
 1094                         }
 1095                         name = ++namelc;
 1096                 }
 1097                 if (name[0] != '\0') {
 1098                         namelen =
 1099                             (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
 1100  name_again:
 1101                         deadpr = NULL;
 1102                         FOREACH_PRISON_CHILD(ppr, tpr) {
 1103                                 if (tpr != pr && tpr->pr_ref > 0 &&
 1104                                     !strcmp(tpr->pr_name + namelen, name)) {
 1105                                         if (pr == NULL &&
 1106                                             cuflags != JAIL_CREATE) {
 1107                                                 mtx_lock(&tpr->pr_mtx);
 1108                                                 if (tpr->pr_ref > 0) {
 1109                                                         /*
 1110                                                          * Use this jail
 1111                                                          * for updates.
 1112                                                          */
 1113                                                         if (tpr->pr_uref > 0) {
 1114                                                                 pr = tpr;
 1115                                                                 break;
 1116                                                         }
 1117                                                         deadpr = tpr;
 1118                                                 }
 1119                                                 mtx_unlock(&tpr->pr_mtx);
 1120                                         } else if (tpr->pr_uref > 0) {
 1121                                                 /*
 1122                                                  * Create, or update(jid):
 1123                                                  * name must not exist in an
 1124                                                  * active sibling jail.
 1125                                                  */
 1126                                                 error = EEXIST;
 1127                                                 if (pr != NULL)
 1128                                                         mtx_unlock(&pr->pr_mtx);
 1129                                                 vfs_opterror(opts,
 1130                                                    "jail \"%s\" already exists",
 1131                                                    name);
 1132                                                 goto done_unlock_list;
 1133                                         }
 1134                                 }
 1135                         }
 1136                         /* If no active jail is found, use a dying one. */
 1137                         if (deadpr != NULL && pr == NULL) {
 1138                                 if (flags & JAIL_DYING) {
 1139                                         mtx_lock(&deadpr->pr_mtx);
 1140                                         if (deadpr->pr_ref == 0) {
 1141                                                 mtx_unlock(&deadpr->pr_mtx);
 1142                                                 goto name_again;
 1143                                         }
 1144                                         pr = deadpr;
 1145                                 } else if (cuflags == JAIL_UPDATE) {
 1146                                         error = ENOENT;
 1147                                         vfs_opterror(opts,
 1148                                             "jail \"%s\" is dying", name);
 1149                                         goto done_unlock_list;
 1150                                 }
 1151                         }
 1152                         /* Update: name must exist if no jid. */
 1153                         else if (cuflags == JAIL_UPDATE && pr == NULL) {
 1154                                 error = ENOENT;
 1155                                 vfs_opterror(opts, "jail \"%s\" not found",
 1156                                     name);
 1157                                 goto done_unlock_list;
 1158                         }
 1159                 }
 1160         }
 1161         /* Update: must provide a jid or name. */
 1162         else if (cuflags == JAIL_UPDATE && pr == NULL) {
 1163                 error = ENOENT;
 1164                 vfs_opterror(opts, "update specified no jail");
 1165                 goto done_unlock_list;
 1166         }
 1167 
 1168         /* If there's no prison to update, create a new one and link it in. */
 1169         if (pr == NULL) {
 1170                 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
 1171                         if (tpr->pr_childcount >= tpr->pr_childmax) {
 1172                                 error = EPERM;
 1173                                 vfs_opterror(opts, "prison limit exceeded");
 1174                                 goto done_unlock_list;
 1175                         }
 1176                 created = 1;
 1177                 mtx_lock(&ppr->pr_mtx);
 1178                 if (ppr->pr_ref == 0 || (ppr->pr_flags & PR_REMOVE)) {
 1179                         mtx_unlock(&ppr->pr_mtx);
 1180                         error = ENOENT;
 1181                         vfs_opterror(opts, "parent jail went away!");
 1182                         goto done_unlock_list;
 1183                 }
 1184                 ppr->pr_ref++;
 1185                 ppr->pr_uref++;
 1186                 mtx_unlock(&ppr->pr_mtx);
 1187                 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
 1188                 if (jid == 0) {
 1189                         /* Find the next free jid. */
 1190                         jid = lastprid + 1;
 1191  findnext:
 1192                         if (jid == JAIL_MAX)
 1193                                 jid = 1;
 1194                         TAILQ_FOREACH(tpr, &allprison, pr_list) {
 1195                                 if (tpr->pr_id < jid)
 1196                                         continue;
 1197                                 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
 1198                                         TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
 1199                                         break;
 1200                                 }
 1201                                 if (jid == lastprid) {
 1202                                         error = EAGAIN;
 1203                                         vfs_opterror(opts,
 1204                                             "no available jail IDs");
 1205                                         free(pr, M_PRISON);
 1206                                         prison_deref(ppr, PD_DEREF |
 1207                                             PD_DEUREF | PD_LIST_XLOCKED);
 1208                                         goto done_releroot;
 1209                                 }
 1210                                 jid++;
 1211                                 goto findnext;
 1212                         }
 1213                         lastprid = jid;
 1214                 } else {
 1215                         /*
 1216                          * The jail already has a jid (that did not yet exist),
 1217                          * so just find where to insert it.
 1218                          */
 1219                         TAILQ_FOREACH(tpr, &allprison, pr_list)
 1220                                 if (tpr->pr_id >= jid) {
 1221                                         TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
 1222                                         break;
 1223                                 }
 1224                 }
 1225                 if (tpr == NULL)
 1226                         TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
 1227                 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
 1228                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 1229                         tpr->pr_childcount++;
 1230 
 1231                 pr->pr_parent = ppr;
 1232                 pr->pr_id = jid;
 1233 
 1234                 /* Set some default values, and inherit some from the parent. */
 1235                 if (name == NULL)
 1236                         name = "";
 1237                 if (path == NULL) {
 1238                         path = "/";
 1239                         root = mypr->pr_root;
 1240                         vref(root);
 1241                 }
 1242                 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
 1243                 pr->pr_flags |= PR_HOST;
 1244 #if defined(INET) || defined(INET6)
 1245 #ifdef VIMAGE
 1246                 if (!(pr_flags & PR_VNET))
 1247 #endif
 1248                 {
 1249 #ifdef INET
 1250                         if (!(ch_flags & PR_IP4_USER))
 1251                                 pr->pr_flags |=
 1252                                     PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
 1253                         else if (!(pr_flags & PR_IP4_USER)) {
 1254                                 pr->pr_flags |= ppr->pr_flags & PR_IP4;
 1255                                 if (ppr->pr_ip4 != NULL) {
 1256                                         pr->pr_ip4s = ppr->pr_ip4s;
 1257                                         pr->pr_ip4 = malloc(pr->pr_ip4s *
 1258                                             sizeof(struct in_addr), M_PRISON,
 1259                                             M_WAITOK);
 1260                                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 1261                                             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 1262                                 }
 1263                         }
 1264 #endif
 1265 #ifdef INET6
 1266                         if (!(ch_flags & PR_IP6_USER))
 1267                                 pr->pr_flags |=
 1268                                     PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
 1269                         else if (!(pr_flags & PR_IP6_USER)) {
 1270                                 pr->pr_flags |= ppr->pr_flags & PR_IP6;
 1271                                 if (ppr->pr_ip6 != NULL) {
 1272                                         pr->pr_ip6s = ppr->pr_ip6s;
 1273                                         pr->pr_ip6 = malloc(pr->pr_ip6s *
 1274                                             sizeof(struct in6_addr), M_PRISON,
 1275                                             M_WAITOK);
 1276                                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 1277                                             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 1278                                 }
 1279                         }
 1280 #endif
 1281                 }
 1282 #endif
 1283                 /* Source address selection is always on by default. */
 1284                 pr->pr_flags |= _PR_IP_SADDRSEL;
 1285 
 1286                 pr->pr_securelevel = ppr->pr_securelevel;
 1287                 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
 1288                 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
 1289                 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
 1290 
 1291                 LIST_INIT(&pr->pr_children);
 1292                 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
 1293 
 1294 #ifdef VIMAGE
 1295                 /* Allocate a new vnet if specified. */
 1296                 pr->pr_vnet = (pr_flags & PR_VNET)
 1297                     ? vnet_alloc() : ppr->pr_vnet;
 1298 #endif
 1299                 /*
 1300                  * Allocate a dedicated cpuset for each jail.
 1301                  * Unlike other initial settings, this may return an erorr.
 1302                  */
 1303                 error = cpuset_create_root(ppr, &pr->pr_cpuset);
 1304                 if (error) {
 1305                         prison_deref(pr, PD_LIST_XLOCKED);
 1306                         goto done_releroot;
 1307                 }
 1308 
 1309                 mtx_lock(&pr->pr_mtx);
 1310                 /*
 1311                  * New prisons do not yet have a reference, because we do not
 1312                  * want other to see the incomplete prison once the
 1313                  * allprison_lock is downgraded.
 1314                  */
 1315         } else {
 1316                 created = 0;
 1317                 /*
 1318                  * Grab a reference for existing prisons, to ensure they
 1319                  * continue to exist for the duration of the call.
 1320                  */
 1321                 pr->pr_ref++;
 1322 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
 1323                 if ((pr->pr_flags & PR_VNET) &&
 1324                     (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
 1325                         error = EINVAL;
 1326                         vfs_opterror(opts,
 1327                             "vnet jails cannot have IP address restrictions");
 1328                         goto done_deref_locked;
 1329                 }
 1330 #endif
 1331 #ifdef INET
 1332                 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
 1333                         error = EINVAL;
 1334                         vfs_opterror(opts,
 1335                             "ip4 cannot be changed after creation");
 1336                         goto done_deref_locked;
 1337                 }
 1338 #endif
 1339 #ifdef INET6
 1340                 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
 1341                         error = EINVAL;
 1342                         vfs_opterror(opts,
 1343                             "ip6 cannot be changed after creation");
 1344                         goto done_deref_locked;
 1345                 }
 1346 #endif
 1347         }
 1348 
 1349         /* Do final error checking before setting anything. */
 1350         if (gotslevel) {
 1351                 if (slevel < ppr->pr_securelevel) {
 1352                         error = EPERM;
 1353                         goto done_deref_locked;
 1354                 }
 1355         }
 1356         if (gotchildmax) {
 1357                 if (childmax >= ppr->pr_childmax) {
 1358                         error = EPERM;
 1359                         goto done_deref_locked;
 1360                 }
 1361         }
 1362         if (gotenforce) {
 1363                 if (enforce < ppr->pr_enforce_statfs) {
 1364                         error = EPERM;
 1365                         goto done_deref_locked;
 1366                 }
 1367         }
 1368         if (gotrsnum) {
 1369                 /*
 1370                  * devfs_rsnum is a uint16_t
 1371                  */
 1372                 if (rsnum < 0 || rsnum > 65535) {
 1373                         error = EINVAL;
 1374                         goto done_deref_locked;
 1375                 }
 1376                 /*
 1377                  * Nested jails always inherit parent's devfs ruleset
 1378                  */
 1379                 if (jailed(td->td_ucred)) {
 1380                         if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
 1381                                 error = EPERM;
 1382                                 goto done_deref_locked;
 1383                         } else
 1384                                 rsnum = ppr->pr_devfs_rsnum;
 1385                 }
 1386         }
 1387 #ifdef INET
 1388         if (ip4s > 0) {
 1389                 if (ppr->pr_flags & PR_IP4) {
 1390                         /*
 1391                          * Make sure the new set of IP addresses is a
 1392                          * subset of the parent's list.  Don't worry
 1393                          * about the parent being unlocked, as any
 1394                          * setting is done with allprison_lock held.
 1395                          */
 1396                         for (ij = 0; ij < ppr->pr_ip4s; ij++)
 1397                                 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 1398                                         break;
 1399                         if (ij == ppr->pr_ip4s) {
 1400                                 error = EPERM;
 1401                                 goto done_deref_locked;
 1402                         }
 1403                         if (ip4s > 1) {
 1404                                 for (ii = ij = 1; ii < ip4s; ii++) {
 1405                                         if (ip4[ii].s_addr ==
 1406                                             ppr->pr_ip4[0].s_addr)
 1407                                                 continue;
 1408                                         for (; ij < ppr->pr_ip4s; ij++)
 1409                                                 if (ip4[ii].s_addr ==
 1410                                                     ppr->pr_ip4[ij].s_addr)
 1411                                                         break;
 1412                                         if (ij == ppr->pr_ip4s)
 1413                                                 break;
 1414                                 }
 1415                                 if (ij == ppr->pr_ip4s) {
 1416                                         error = EPERM;
 1417                                         goto done_deref_locked;
 1418                                 }
 1419                         }
 1420                 }
 1421                 /*
 1422                  * Check for conflicting IP addresses.  We permit them
 1423                  * if there is no more than one IP on each jail.  If
 1424                  * there is a duplicate on a jail with more than one
 1425                  * IP stop checking and return error.
 1426                  */
 1427                 tppr = ppr;
 1428 #ifdef VIMAGE
 1429                 for (; tppr != &prison0; tppr = tppr->pr_parent)
 1430                         if (tppr->pr_flags & PR_VNET)
 1431                                 break;
 1432 #endif
 1433                 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
 1434                         if (tpr == pr ||
 1435 #ifdef VIMAGE
 1436                             (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
 1437 #endif
 1438                             tpr->pr_uref == 0) {
 1439                                 descend = 0;
 1440                                 continue;
 1441                         }
 1442                         if (!(tpr->pr_flags & PR_IP4_USER))
 1443                                 continue;
 1444                         descend = 0;
 1445                         if (tpr->pr_ip4 == NULL ||
 1446                             (ip4s == 1 && tpr->pr_ip4s == 1))
 1447                                 continue;
 1448                         for (ii = 0; ii < ip4s; ii++) {
 1449                                 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
 1450                                         error = EADDRINUSE;
 1451                                         vfs_opterror(opts,
 1452                                             "IPv4 addresses clash");
 1453                                         goto done_deref_locked;
 1454                                 }
 1455                         }
 1456                 }
 1457         }
 1458 #endif
 1459 #ifdef INET6
 1460         if (ip6s > 0) {
 1461                 if (ppr->pr_flags & PR_IP6) {
 1462                         /*
 1463                          * Make sure the new set of IP addresses is a
 1464                          * subset of the parent's list.
 1465                          */
 1466                         for (ij = 0; ij < ppr->pr_ip6s; ij++)
 1467                                 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
 1468                                     &ppr->pr_ip6[ij]))
 1469                                         break;
 1470                         if (ij == ppr->pr_ip6s) {
 1471                                 error = EPERM;
 1472                                 goto done_deref_locked;
 1473                         }
 1474                         if (ip6s > 1) {
 1475                                 for (ii = ij = 1; ii < ip6s; ii++) {
 1476                                         if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
 1477                                              &ppr->pr_ip6[0]))
 1478                                                 continue;
 1479                                         for (; ij < ppr->pr_ip6s; ij++)
 1480                                                 if (IN6_ARE_ADDR_EQUAL(
 1481                                                     &ip6[ii], &ppr->pr_ip6[ij]))
 1482                                                         break;
 1483                                         if (ij == ppr->pr_ip6s)
 1484                                                 break;
 1485                                 }
 1486                                 if (ij == ppr->pr_ip6s) {
 1487                                         error = EPERM;
 1488                                         goto done_deref_locked;
 1489                                 }
 1490                         }
 1491                 }
 1492                 /* Check for conflicting IP addresses. */
 1493                 tppr = ppr;
 1494 #ifdef VIMAGE
 1495                 for (; tppr != &prison0; tppr = tppr->pr_parent)
 1496                         if (tppr->pr_flags & PR_VNET)
 1497                                 break;
 1498 #endif
 1499                 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
 1500                         if (tpr == pr ||
 1501 #ifdef VIMAGE
 1502                             (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
 1503 #endif
 1504                             tpr->pr_uref == 0) {
 1505                                 descend = 0;
 1506                                 continue;
 1507                         }
 1508                         if (!(tpr->pr_flags & PR_IP6_USER))
 1509                                 continue;
 1510                         descend = 0;
 1511                         if (tpr->pr_ip6 == NULL ||
 1512                             (ip6s == 1 && tpr->pr_ip6s == 1))
 1513                                 continue;
 1514                         for (ii = 0; ii < ip6s; ii++) {
 1515                                 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
 1516                                         error = EADDRINUSE;
 1517                                         vfs_opterror(opts,
 1518                                             "IPv6 addresses clash");
 1519                                         goto done_deref_locked;
 1520                                 }
 1521                         }
 1522                 }
 1523         }
 1524 #endif
 1525         onamelen = namelen = 0;
 1526         if (name != NULL) {
 1527                 /* Give a default name of the jid. */
 1528                 if (name[0] == '\0')
 1529                         snprintf(name = numbuf, sizeof(numbuf), "%d", jid);
 1530                 else if (*namelc == '' || (strtoul(namelc, &p, 10) != jid &&
 1531                     *p == '\0')) {
 1532                         error = EINVAL;
 1533                         vfs_opterror(opts,
 1534                             "name cannot be numeric (unless it is the jid)");
 1535                         goto done_deref_locked;
 1536                 }
 1537                 /*
 1538                  * Make sure the name isn't too long for the prison or its
 1539                  * children.
 1540                  */
 1541                 onamelen = strlen(pr->pr_name);
 1542                 namelen = strlen(name);
 1543                 if (strlen(ppr->pr_name) + namelen + 2 > sizeof(pr->pr_name)) {
 1544                         error = ENAMETOOLONG;
 1545                         goto done_deref_locked;
 1546                 }
 1547                 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
 1548                         if (strlen(tpr->pr_name) + (namelen - onamelen) >=
 1549                             sizeof(pr->pr_name)) {
 1550                                 error = ENAMETOOLONG;
 1551                                 goto done_deref_locked;
 1552                         }
 1553                 }
 1554         }
 1555         if (pr_allow & ~ppr->pr_allow) {
 1556                 error = EPERM;
 1557                 goto done_deref_locked;
 1558         }
 1559 
 1560         /* Set the parameters of the prison. */
 1561 #ifdef INET
 1562         redo_ip4 = 0;
 1563         if (pr_flags & PR_IP4_USER) {
 1564                 pr->pr_flags |= PR_IP4;
 1565                 free(pr->pr_ip4, M_PRISON);
 1566                 pr->pr_ip4s = ip4s;
 1567                 pr->pr_ip4 = ip4;
 1568                 ip4 = NULL;
 1569                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1570 #ifdef VIMAGE
 1571                         if (tpr->pr_flags & PR_VNET) {
 1572                                 descend = 0;
 1573                                 continue;
 1574                         }
 1575 #endif
 1576                         if (prison_restrict_ip4(tpr, NULL)) {
 1577                                 redo_ip4 = 1;
 1578                                 descend = 0;
 1579                         }
 1580                 }
 1581         }
 1582 #endif
 1583 #ifdef INET6
 1584         redo_ip6 = 0;
 1585         if (pr_flags & PR_IP6_USER) {
 1586                 pr->pr_flags |= PR_IP6;
 1587                 free(pr->pr_ip6, M_PRISON);
 1588                 pr->pr_ip6s = ip6s;
 1589                 pr->pr_ip6 = ip6;
 1590                 ip6 = NULL;
 1591                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1592 #ifdef VIMAGE
 1593                         if (tpr->pr_flags & PR_VNET) {
 1594                                 descend = 0;
 1595                                 continue;
 1596                         }
 1597 #endif
 1598                         if (prison_restrict_ip6(tpr, NULL)) {
 1599                                 redo_ip6 = 1;
 1600                                 descend = 0;
 1601                         }
 1602                 }
 1603         }
 1604 #endif
 1605         if (gotslevel) {
 1606                 pr->pr_securelevel = slevel;
 1607                 /* Set all child jails to be at least this level. */
 1608                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1609                         if (tpr->pr_securelevel < slevel)
 1610                                 tpr->pr_securelevel = slevel;
 1611         }
 1612         if (gotchildmax) {
 1613                 pr->pr_childmax = childmax;
 1614                 /* Set all child jails to under this limit. */
 1615                 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
 1616                         if (tpr->pr_childmax > childmax - level)
 1617                                 tpr->pr_childmax = childmax > level
 1618                                     ? childmax - level : 0;
 1619         }
 1620         if (gotenforce) {
 1621                 pr->pr_enforce_statfs = enforce;
 1622                 /* Pass this restriction on to the children. */
 1623                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1624                         if (tpr->pr_enforce_statfs < enforce)
 1625                                 tpr->pr_enforce_statfs = enforce;
 1626         }
 1627         if (gotrsnum) {
 1628                 pr->pr_devfs_rsnum = rsnum;
 1629                 /* Pass this restriction on to the children. */
 1630                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1631                         tpr->pr_devfs_rsnum = rsnum;
 1632         }
 1633         if (name != NULL) {
 1634                 if (ppr == &prison0)
 1635                         strlcpy(pr->pr_name, name, sizeof(pr->pr_name));
 1636                 else
 1637                         snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
 1638                             ppr->pr_name, name);
 1639                 /* Change this component of child names. */
 1640                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1641                         bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
 1642                             strlen(tpr->pr_name + onamelen) + 1);
 1643                         bcopy(pr->pr_name, tpr->pr_name, namelen);
 1644                 }
 1645         }
 1646         if (path != NULL) {
 1647                 /* Try to keep a real-rooted full pathname. */
 1648                 if (fullpath_disabled && path[0] == '/' &&
 1649                     strcmp(mypr->pr_path, "/"))
 1650                         snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
 1651                             mypr->pr_path, path);
 1652                 else
 1653                         strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
 1654                 pr->pr_root = root;
 1655         }
 1656         if (PR_HOST & ch_flags & ~pr_flags) {
 1657                 if (pr->pr_flags & PR_HOST) {
 1658                         /*
 1659                          * Copy the parent's host info.  As with pr_ip4 above,
 1660                          * the lack of a lock on the parent is not a problem;
 1661                          * it is always set with allprison_lock at least
 1662                          * shared, and is held exclusively here.
 1663                          */
 1664                         strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
 1665                             sizeof(pr->pr_hostname));
 1666                         strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
 1667                             sizeof(pr->pr_domainname));
 1668                         strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
 1669                             sizeof(pr->pr_hostuuid));
 1670                         pr->pr_hostid = pr->pr_parent->pr_hostid;
 1671                 }
 1672         } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
 1673                 /* Set this prison, and any descendants without PR_HOST. */
 1674                 if (host != NULL)
 1675                         strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
 1676                 if (domain != NULL)
 1677                         strlcpy(pr->pr_domainname, domain, 
 1678                             sizeof(pr->pr_domainname));
 1679                 if (uuid != NULL)
 1680                         strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
 1681                 if (gothid)
 1682                         pr->pr_hostid = hid;
 1683                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1684                         if (tpr->pr_flags & PR_HOST)
 1685                                 descend = 0;
 1686                         else {
 1687                                 if (host != NULL)
 1688                                         strlcpy(tpr->pr_hostname,
 1689                                             pr->pr_hostname,
 1690                                             sizeof(tpr->pr_hostname));
 1691                                 if (domain != NULL)
 1692                                         strlcpy(tpr->pr_domainname, 
 1693                                             pr->pr_domainname,
 1694                                             sizeof(tpr->pr_domainname));
 1695                                 if (uuid != NULL)
 1696                                         strlcpy(tpr->pr_hostuuid,
 1697                                             pr->pr_hostuuid,
 1698                                             sizeof(tpr->pr_hostuuid));
 1699                                 if (gothid)
 1700                                         tpr->pr_hostid = hid;
 1701                         }
 1702                 }
 1703         }
 1704         if ((tallow = ch_allow & ~pr_allow)) {
 1705                 /* Clear allow bits in all children. */
 1706                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1707                         tpr->pr_allow &= ~tallow;
 1708         }
 1709         pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
 1710         /*
 1711          * Persistent prisons get an extra reference, and prisons losing their
 1712          * persist flag lose that reference.  Only do this for existing prisons
 1713          * for now, so new ones will remain unseen until after the module
 1714          * handlers have completed.
 1715          */
 1716         if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
 1717                 if (pr_flags & PR_PERSIST) {
 1718                         pr->pr_ref++;
 1719                         pr->pr_uref++;
 1720                 } else {
 1721                         pr->pr_ref--;
 1722                         pr->pr_uref--;
 1723                 }
 1724         }
 1725         pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
 1726         mtx_unlock(&pr->pr_mtx);
 1727 
 1728 #ifdef RACCT
 1729         if (created)
 1730                 prison_racct_attach(pr);
 1731 #endif
 1732 
 1733         /* Locks may have prevented a complete restriction of child IP
 1734          * addresses.  If so, allocate some more memory and try again.
 1735          */
 1736 #ifdef INET
 1737         while (redo_ip4) {
 1738                 ip4s = pr->pr_ip4s;
 1739                 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
 1740                 mtx_lock(&pr->pr_mtx);
 1741                 redo_ip4 = 0;
 1742                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1743 #ifdef VIMAGE
 1744                         if (tpr->pr_flags & PR_VNET) {
 1745                                 descend = 0;
 1746                                 continue;
 1747                         }
 1748 #endif
 1749                         if (prison_restrict_ip4(tpr, ip4)) {
 1750                                 if (ip4 != NULL)
 1751                                         ip4 = NULL;
 1752                                 else
 1753                                         redo_ip4 = 1;
 1754                         }
 1755                 }
 1756                 mtx_unlock(&pr->pr_mtx);
 1757         }
 1758 #endif
 1759 #ifdef INET6
 1760         while (redo_ip6) {
 1761                 ip6s = pr->pr_ip6s;
 1762                 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
 1763                 mtx_lock(&pr->pr_mtx);
 1764                 redo_ip6 = 0;
 1765                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1766 #ifdef VIMAGE
 1767                         if (tpr->pr_flags & PR_VNET) {
 1768                                 descend = 0;
 1769                                 continue;
 1770                         }
 1771 #endif
 1772                         if (prison_restrict_ip6(tpr, ip6)) {
 1773                                 if (ip6 != NULL)
 1774                                         ip6 = NULL;
 1775                                 else
 1776                                         redo_ip6 = 1;
 1777                         }
 1778                 }
 1779                 mtx_unlock(&pr->pr_mtx);
 1780         }
 1781 #endif
 1782 
 1783         /* Let the modules do their work. */
 1784         sx_downgrade(&allprison_lock);
 1785         if (created) {
 1786                 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
 1787                 if (error) {
 1788                         prison_deref(pr, PD_LIST_SLOCKED);
 1789                         goto done_errmsg;
 1790                 }
 1791         }
 1792         error = osd_jail_call(pr, PR_METHOD_SET, opts);
 1793         if (error) {
 1794                 prison_deref(pr, created
 1795                     ? PD_LIST_SLOCKED
 1796                     : PD_DEREF | PD_LIST_SLOCKED);
 1797                 goto done_errmsg;
 1798         }
 1799 
 1800         /* Attach this process to the prison if requested. */
 1801         if (flags & JAIL_ATTACH) {
 1802                 mtx_lock(&pr->pr_mtx);
 1803                 error = do_jail_attach(td, pr);
 1804                 if (error) {
 1805                         vfs_opterror(opts, "attach failed");
 1806                         if (!created)
 1807                                 prison_deref(pr, PD_DEREF);
 1808                         goto done_errmsg;
 1809                 }
 1810         }
 1811 
 1812 #ifdef RACCT
 1813         if (!created) {
 1814                 sx_sunlock(&allprison_lock);
 1815                 prison_racct_modify(pr);
 1816                 sx_slock(&allprison_lock);
 1817         }
 1818 #endif
 1819 
 1820         td->td_retval[0] = pr->pr_id;
 1821 
 1822         /*
 1823          * Now that it is all there, drop the temporary reference from existing
 1824          * prisons.  Or add a reference to newly created persistent prisons
 1825          * (which was not done earlier so that the prison would not be publicly
 1826          * visible).
 1827          */
 1828         if (!created) {
 1829                 prison_deref(pr, (flags & JAIL_ATTACH)
 1830                     ? PD_DEREF
 1831                     : PD_DEREF | PD_LIST_SLOCKED);
 1832         } else {
 1833                 if (pr_flags & PR_PERSIST) {
 1834                         mtx_lock(&pr->pr_mtx);
 1835                         pr->pr_ref++;
 1836                         pr->pr_uref++;
 1837                         mtx_unlock(&pr->pr_mtx);
 1838                 }
 1839                 if (!(flags & JAIL_ATTACH))
 1840                         sx_sunlock(&allprison_lock);
 1841         }
 1842 
 1843         goto done_errmsg;
 1844 
 1845  done_deref_locked:
 1846         prison_deref(pr, created
 1847             ? PD_LOCKED | PD_LIST_XLOCKED
 1848             : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 1849         goto done_releroot;
 1850  done_unlock_list:
 1851         sx_xunlock(&allprison_lock);
 1852  done_releroot:
 1853         if (root != NULL)
 1854                 vrele(root);
 1855  done_errmsg:
 1856         if (error) {
 1857                 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
 1858                 if (errmsg_len > 0) {
 1859                         errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
 1860                         if (errmsg_pos > 0) {
 1861                                 if (optuio->uio_segflg == UIO_SYSSPACE)
 1862                                         bcopy(errmsg,
 1863                                            optuio->uio_iov[errmsg_pos].iov_base,
 1864                                            errmsg_len);
 1865                                 else
 1866                                         copyout(errmsg,
 1867                                            optuio->uio_iov[errmsg_pos].iov_base,
 1868                                            errmsg_len);
 1869                         }
 1870                 }
 1871         }
 1872  done_free:
 1873 #ifdef INET
 1874         free(ip4, M_PRISON);
 1875 #endif
 1876 #ifdef INET6
 1877         free(ip6, M_PRISON);
 1878 #endif
 1879         if (g_path != NULL)
 1880                 free(g_path, M_TEMP);
 1881         vfs_freeopts(opts);
 1882         return (error);
 1883 }
 1884 
 1885 
 1886 /*
 1887  * struct jail_get_args {
 1888  *      struct iovec *iovp;
 1889  *      unsigned int iovcnt;
 1890  *      int flags;
 1891  * };
 1892  */
 1893 int
 1894 sys_jail_get(struct thread *td, struct jail_get_args *uap)
 1895 {
 1896         struct uio *auio;
 1897         int error;
 1898 
 1899         /* Check that we have an even number of iovecs. */
 1900         if (uap->iovcnt & 1)
 1901                 return (EINVAL);
 1902 
 1903         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
 1904         if (error)
 1905                 return (error);
 1906         error = kern_jail_get(td, auio, uap->flags);
 1907         if (error == 0)
 1908                 error = copyout(auio->uio_iov, uap->iovp,
 1909                     uap->iovcnt * sizeof (struct iovec));
 1910         free(auio, M_IOV);
 1911         return (error);
 1912 }
 1913 
 1914 int
 1915 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
 1916 {
 1917         struct prison *pr, *mypr;
 1918         struct vfsopt *opt;
 1919         struct vfsoptlist *opts;
 1920         char *errmsg, *name;
 1921         int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
 1922 
 1923         if (flags & ~JAIL_GET_MASK)
 1924                 return (EINVAL);
 1925 
 1926         /* Get the parameter list. */
 1927         error = vfs_buildopts(optuio, &opts);
 1928         if (error)
 1929                 return (error);
 1930         errmsg_pos = vfs_getopt_pos(opts, "errmsg");
 1931         mypr = td->td_ucred->cr_prison;
 1932 
 1933         /*
 1934          * Find the prison specified by one of: lastjid, jid, name.
 1935          */
 1936         sx_slock(&allprison_lock);
 1937         error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
 1938         if (error == 0) {
 1939                 TAILQ_FOREACH(pr, &allprison, pr_list) {
 1940                         if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
 1941                                 mtx_lock(&pr->pr_mtx);
 1942                                 if (pr->pr_ref > 0 &&
 1943                                     (pr->pr_uref > 0 || (flags & JAIL_DYING)))
 1944                                         break;
 1945                                 mtx_unlock(&pr->pr_mtx);
 1946                         }
 1947                 }
 1948                 if (pr != NULL)
 1949                         goto found_prison;
 1950                 error = ENOENT;
 1951                 vfs_opterror(opts, "no jail after %d", jid);
 1952                 goto done_unlock_list;
 1953         } else if (error != ENOENT)
 1954                 goto done_unlock_list;
 1955 
 1956         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
 1957         if (error == 0) {
 1958                 if (jid != 0) {
 1959                         pr = prison_find_child(mypr, jid);
 1960                         if (pr != NULL) {
 1961                                 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 1962                                         mtx_unlock(&pr->pr_mtx);
 1963                                         error = ENOENT;
 1964                                         vfs_opterror(opts, "jail %d is dying",
 1965                                             jid);
 1966                                         goto done_unlock_list;
 1967                                 }
 1968                                 goto found_prison;
 1969                         }
 1970                         error = ENOENT;
 1971                         vfs_opterror(opts, "jail %d not found", jid);
 1972                         goto done_unlock_list;
 1973                 }
 1974         } else if (error != ENOENT)
 1975                 goto done_unlock_list;
 1976 
 1977         error = vfs_getopt(opts, "name", (void **)&name, &len);
 1978         if (error == 0) {
 1979                 if (len == 0 || name[len - 1] != '\0') {
 1980                         error = EINVAL;
 1981                         goto done_unlock_list;
 1982                 }
 1983                 pr = prison_find_name(mypr, name);
 1984                 if (pr != NULL) {
 1985                         if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 1986                                 mtx_unlock(&pr->pr_mtx);
 1987                                 error = ENOENT;
 1988                                 vfs_opterror(opts, "jail \"%s\" is dying",
 1989                                     name);
 1990                                 goto done_unlock_list;
 1991                         }
 1992                         goto found_prison;
 1993                 }
 1994                 error = ENOENT;
 1995                 vfs_opterror(opts, "jail \"%s\" not found", name);
 1996                 goto done_unlock_list;
 1997         } else if (error != ENOENT)
 1998                 goto done_unlock_list;
 1999 
 2000         vfs_opterror(opts, "no jail specified");
 2001         error = ENOENT;
 2002         goto done_unlock_list;
 2003 
 2004  found_prison:
 2005         /* Get the parameters of the prison. */
 2006         pr->pr_ref++;
 2007         locked = PD_LOCKED;
 2008         td->td_retval[0] = pr->pr_id;
 2009         error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
 2010         if (error != 0 && error != ENOENT)
 2011                 goto done_deref;
 2012         i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
 2013         error = vfs_setopt(opts, "parent", &i, sizeof(i));
 2014         if (error != 0 && error != ENOENT)
 2015                 goto done_deref;
 2016         error = vfs_setopts(opts, "name", prison_name(mypr, pr));
 2017         if (error != 0 && error != ENOENT)
 2018                 goto done_deref;
 2019         error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
 2020             sizeof(pr->pr_cpuset->cs_id));
 2021         if (error != 0 && error != ENOENT)
 2022                 goto done_deref;
 2023         error = vfs_setopts(opts, "path", prison_path(mypr, pr));
 2024         if (error != 0 && error != ENOENT)
 2025                 goto done_deref;
 2026 #ifdef INET
 2027         error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
 2028             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2029         if (error != 0 && error != ENOENT)
 2030                 goto done_deref;
 2031 #endif
 2032 #ifdef INET6
 2033         error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
 2034             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 2035         if (error != 0 && error != ENOENT)
 2036                 goto done_deref;
 2037 #endif
 2038         error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
 2039             sizeof(pr->pr_securelevel));
 2040         if (error != 0 && error != ENOENT)
 2041                 goto done_deref;
 2042         error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
 2043             sizeof(pr->pr_childcount));
 2044         if (error != 0 && error != ENOENT)
 2045                 goto done_deref;
 2046         error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
 2047             sizeof(pr->pr_childmax));
 2048         if (error != 0 && error != ENOENT)
 2049                 goto done_deref;
 2050         error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
 2051         if (error != 0 && error != ENOENT)
 2052                 goto done_deref;
 2053         error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
 2054         if (error != 0 && error != ENOENT)
 2055                 goto done_deref;
 2056         error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
 2057         if (error != 0 && error != ENOENT)
 2058                 goto done_deref;
 2059 #ifdef COMPAT_FREEBSD32
 2060         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
 2061                 uint32_t hid32 = pr->pr_hostid;
 2062 
 2063                 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
 2064         } else
 2065 #endif
 2066         error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
 2067             sizeof(pr->pr_hostid));
 2068         if (error != 0 && error != ENOENT)
 2069                 goto done_deref;
 2070         error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
 2071             sizeof(pr->pr_enforce_statfs));
 2072         if (error != 0 && error != ENOENT)
 2073                 goto done_deref;
 2074         error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
 2075             sizeof(pr->pr_devfs_rsnum));
 2076         if (error != 0 && error != ENOENT)
 2077                 goto done_deref;
 2078         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 2079             fi++) {
 2080                 if (pr_flag_names[fi] == NULL)
 2081                         continue;
 2082                 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
 2083                 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
 2084                 if (error != 0 && error != ENOENT)
 2085                         goto done_deref;
 2086                 i = !i;
 2087                 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
 2088                 if (error != 0 && error != ENOENT)
 2089                         goto done_deref;
 2090         }
 2091         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 2092             fi++) {
 2093                 i = pr->pr_flags &
 2094                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 2095                 i = pr_flag_jailsys[fi].disable &&
 2096                       (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
 2097                     : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
 2098                     : JAIL_SYS_INHERIT;
 2099                 error =
 2100                     vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
 2101                 if (error != 0 && error != ENOENT)
 2102                         goto done_deref;
 2103         }
 2104         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 2105             fi++) {
 2106                 if (pr_allow_names[fi] == NULL)
 2107                         continue;
 2108                 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
 2109                 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
 2110                 if (error != 0 && error != ENOENT)
 2111                         goto done_deref;
 2112                 i = !i;
 2113                 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
 2114                 if (error != 0 && error != ENOENT)
 2115                         goto done_deref;
 2116         }
 2117         i = (pr->pr_uref == 0);
 2118         error = vfs_setopt(opts, "dying", &i, sizeof(i));
 2119         if (error != 0 && error != ENOENT)
 2120                 goto done_deref;
 2121         i = !i;
 2122         error = vfs_setopt(opts, "nodying", &i, sizeof(i));
 2123         if (error != 0 && error != ENOENT)
 2124                 goto done_deref;
 2125 
 2126         /* Get the module parameters. */
 2127         mtx_unlock(&pr->pr_mtx);
 2128         locked = 0;
 2129         error = osd_jail_call(pr, PR_METHOD_GET, opts);
 2130         if (error)
 2131                 goto done_deref;
 2132         prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
 2133 
 2134         /* By now, all parameters should have been noted. */
 2135         TAILQ_FOREACH(opt, opts, link) {
 2136                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
 2137                         error = EINVAL;
 2138                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
 2139                         goto done_errmsg;
 2140                 }
 2141         }
 2142 
 2143         /* Write the fetched parameters back to userspace. */
 2144         error = 0;
 2145         TAILQ_FOREACH(opt, opts, link) {
 2146                 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
 2147                         pos = 2 * opt->pos + 1;
 2148                         optuio->uio_iov[pos].iov_len = opt->len;
 2149                         if (opt->value != NULL) {
 2150                                 if (optuio->uio_segflg == UIO_SYSSPACE) {
 2151                                         bcopy(opt->value,
 2152                                             optuio->uio_iov[pos].iov_base,
 2153                                             opt->len);
 2154                                 } else {
 2155                                         error = copyout(opt->value,
 2156                                             optuio->uio_iov[pos].iov_base,
 2157                                             opt->len);
 2158                                         if (error)
 2159                                                 break;
 2160                                 }
 2161                         }
 2162                 }
 2163         }
 2164         goto done_errmsg;
 2165 
 2166  done_deref:
 2167         prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
 2168         goto done_errmsg;
 2169 
 2170  done_unlock_list:
 2171         sx_sunlock(&allprison_lock);
 2172  done_errmsg:
 2173         if (error && errmsg_pos >= 0) {
 2174                 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
 2175                 errmsg_pos = 2 * errmsg_pos + 1;
 2176                 if (errmsg_len > 0) {
 2177                         if (optuio->uio_segflg == UIO_SYSSPACE)
 2178                                 bcopy(errmsg,
 2179                                     optuio->uio_iov[errmsg_pos].iov_base,
 2180                                     errmsg_len);
 2181                         else
 2182                                 copyout(errmsg,
 2183                                     optuio->uio_iov[errmsg_pos].iov_base,
 2184                                     errmsg_len);
 2185                 }
 2186         }
 2187         vfs_freeopts(opts);
 2188         return (error);
 2189 }
 2190 
 2191 
 2192 /*
 2193  * struct jail_remove_args {
 2194  *      int jid;
 2195  * };
 2196  */
 2197 int
 2198 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
 2199 {
 2200         struct prison *pr, *cpr, *lpr, *tpr;
 2201         int descend, error;
 2202 
 2203         error = priv_check(td, PRIV_JAIL_REMOVE);
 2204         if (error)
 2205                 return (error);
 2206 
 2207         sx_xlock(&allprison_lock);
 2208         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2209         if (pr == NULL) {
 2210                 sx_xunlock(&allprison_lock);
 2211                 return (EINVAL);
 2212         }
 2213 
 2214         /* Remove all descendants of this prison, then remove this prison. */
 2215         pr->pr_ref++;
 2216         pr->pr_flags |= PR_REMOVE;
 2217         if (!LIST_EMPTY(&pr->pr_children)) {
 2218                 mtx_unlock(&pr->pr_mtx);
 2219                 lpr = NULL;
 2220                 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 2221                         mtx_lock(&cpr->pr_mtx);
 2222                         if (cpr->pr_ref > 0) {
 2223                                 tpr = cpr;
 2224                                 cpr->pr_ref++;
 2225                                 cpr->pr_flags |= PR_REMOVE;
 2226                         } else {
 2227                                 /* Already removed - do not do it again. */
 2228                                 tpr = NULL;
 2229                         }
 2230                         mtx_unlock(&cpr->pr_mtx);
 2231                         if (lpr != NULL) {
 2232                                 mtx_lock(&lpr->pr_mtx);
 2233                                 prison_remove_one(lpr);
 2234                                 sx_xlock(&allprison_lock);
 2235                         }
 2236                         lpr = tpr;
 2237                 }
 2238                 if (lpr != NULL) {
 2239                         mtx_lock(&lpr->pr_mtx);
 2240                         prison_remove_one(lpr);
 2241                         sx_xlock(&allprison_lock);
 2242                 }
 2243                 mtx_lock(&pr->pr_mtx);
 2244         }
 2245         prison_remove_one(pr);
 2246         return (0);
 2247 }
 2248 
 2249 static void
 2250 prison_remove_one(struct prison *pr)
 2251 {
 2252         struct proc *p;
 2253         int deuref;
 2254 
 2255         /* If the prison was persistent, it is not anymore. */
 2256         deuref = 0;
 2257         if (pr->pr_flags & PR_PERSIST) {
 2258                 pr->pr_ref--;
 2259                 deuref = PD_DEUREF;
 2260                 pr->pr_flags &= ~PR_PERSIST;
 2261         }
 2262 
 2263         /*
 2264          * jail_remove added a reference.  If that's the only one, remove
 2265          * the prison now.
 2266          */
 2267         KASSERT(pr->pr_ref > 0,
 2268             ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
 2269         if (pr->pr_ref == 1) {
 2270                 prison_deref(pr,
 2271                     deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 2272                 return;
 2273         }
 2274 
 2275         mtx_unlock(&pr->pr_mtx);
 2276         sx_xunlock(&allprison_lock);
 2277         /*
 2278          * Kill all processes unfortunate enough to be attached to this prison.
 2279          */
 2280         sx_slock(&allproc_lock);
 2281         LIST_FOREACH(p, &allproc, p_list) {
 2282                 PROC_LOCK(p);
 2283                 if (p->p_state != PRS_NEW && p->p_ucred &&
 2284                     p->p_ucred->cr_prison == pr)
 2285                         kern_psignal(p, SIGKILL);
 2286                 PROC_UNLOCK(p);
 2287         }
 2288         sx_sunlock(&allproc_lock);
 2289         /* Remove the temporary reference added by jail_remove. */
 2290         prison_deref(pr, deuref | PD_DEREF);
 2291 }
 2292 
 2293 
 2294 /*
 2295  * struct jail_attach_args {
 2296  *      int jid;
 2297  * };
 2298  */
 2299 int
 2300 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
 2301 {
 2302         struct prison *pr;
 2303         int error;
 2304 
 2305         error = priv_check(td, PRIV_JAIL_ATTACH);
 2306         if (error)
 2307                 return (error);
 2308 
 2309         sx_slock(&allprison_lock);
 2310         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2311         if (pr == NULL) {
 2312                 sx_sunlock(&allprison_lock);
 2313                 return (EINVAL);
 2314         }
 2315 
 2316         /*
 2317          * Do not allow a process to attach to a prison that is not
 2318          * considered to be "alive".
 2319          */
 2320         if (pr->pr_uref == 0) {
 2321                 mtx_unlock(&pr->pr_mtx);
 2322                 sx_sunlock(&allprison_lock);
 2323                 return (EINVAL);
 2324         }
 2325 
 2326         return (do_jail_attach(td, pr));
 2327 }
 2328 
 2329 static int
 2330 do_jail_attach(struct thread *td, struct prison *pr)
 2331 {
 2332         struct prison *ppr;
 2333         struct proc *p;
 2334         struct ucred *newcred, *oldcred;
 2335         int error;
 2336 
 2337         /*
 2338          * XXX: Note that there is a slight race here if two threads
 2339          * in the same privileged process attempt to attach to two
 2340          * different jails at the same time.  It is important for
 2341          * user processes not to do this, or they might end up with
 2342          * a process root from one prison, but attached to the jail
 2343          * of another.
 2344          */
 2345         pr->pr_ref++;
 2346         pr->pr_uref++;
 2347         mtx_unlock(&pr->pr_mtx);
 2348 
 2349         /* Let modules do whatever they need to prepare for attaching. */
 2350         error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
 2351         if (error) {
 2352                 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
 2353                 return (error);
 2354         }
 2355         sx_sunlock(&allprison_lock);
 2356 
 2357         /*
 2358          * Reparent the newly attached process to this jail.
 2359          */
 2360         ppr = td->td_ucred->cr_prison;
 2361         p = td->td_proc;
 2362         error = cpuset_setproc_update_set(p, pr->pr_cpuset);
 2363         if (error)
 2364                 goto e_revert_osd;
 2365 
 2366         vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
 2367         if ((error = change_dir(pr->pr_root, td)) != 0)
 2368                 goto e_unlock;
 2369 #ifdef MAC
 2370         if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
 2371                 goto e_unlock;
 2372 #endif
 2373         VOP_UNLOCK(pr->pr_root, 0);
 2374         if ((error = change_root(pr->pr_root, td)))
 2375                 goto e_revert_osd;
 2376 
 2377         newcred = crget();
 2378         PROC_LOCK(p);
 2379         oldcred = p->p_ucred;
 2380         setsugid(p);
 2381         crcopy(newcred, oldcred);
 2382         newcred->cr_prison = pr;
 2383         p->p_ucred = newcred;
 2384         PROC_UNLOCK(p);
 2385 #ifdef RACCT
 2386         racct_proc_ucred_changed(p, oldcred, newcred);
 2387 #endif
 2388         crfree(oldcred);
 2389         prison_deref(ppr, PD_DEREF | PD_DEUREF);
 2390         return (0);
 2391  e_unlock:
 2392         VOP_UNLOCK(pr->pr_root, 0);
 2393  e_revert_osd:
 2394         /* Tell modules this thread is still in its old jail after all. */
 2395         (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
 2396         prison_deref(pr, PD_DEREF | PD_DEUREF);
 2397         return (error);
 2398 }
 2399 
 2400 
 2401 /*
 2402  * Returns a locked prison instance, or NULL on failure.
 2403  */
 2404 struct prison *
 2405 prison_find(int prid)
 2406 {
 2407         struct prison *pr;
 2408 
 2409         sx_assert(&allprison_lock, SX_LOCKED);
 2410         TAILQ_FOREACH(pr, &allprison, pr_list) {
 2411                 if (pr->pr_id == prid) {
 2412                         mtx_lock(&pr->pr_mtx);
 2413                         if (pr->pr_ref > 0)
 2414                                 return (pr);
 2415                         mtx_unlock(&pr->pr_mtx);
 2416                 }
 2417         }
 2418         return (NULL);
 2419 }
 2420 
 2421 /*
 2422  * Find a prison that is a descendant of mypr.  Returns a locked prison or NULL.
 2423  */
 2424 struct prison *
 2425 prison_find_child(struct prison *mypr, int prid)
 2426 {
 2427         struct prison *pr;
 2428         int descend;
 2429 
 2430         sx_assert(&allprison_lock, SX_LOCKED);
 2431         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2432                 if (pr->pr_id == prid) {
 2433                         mtx_lock(&pr->pr_mtx);
 2434                         if (pr->pr_ref > 0)
 2435                                 return (pr);
 2436                         mtx_unlock(&pr->pr_mtx);
 2437                 }
 2438         }
 2439         return (NULL);
 2440 }
 2441 
 2442 /*
 2443  * Look for the name relative to mypr.  Returns a locked prison or NULL.
 2444  */
 2445 struct prison *
 2446 prison_find_name(struct prison *mypr, const char *name)
 2447 {
 2448         struct prison *pr, *deadpr;
 2449         size_t mylen;
 2450         int descend;
 2451 
 2452         sx_assert(&allprison_lock, SX_LOCKED);
 2453         mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
 2454  again:
 2455         deadpr = NULL;
 2456         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2457                 if (!strcmp(pr->pr_name + mylen, name)) {
 2458                         mtx_lock(&pr->pr_mtx);
 2459                         if (pr->pr_ref > 0) {
 2460                                 if (pr->pr_uref > 0)
 2461                                         return (pr);
 2462                                 deadpr = pr;
 2463                         }
 2464                         mtx_unlock(&pr->pr_mtx);
 2465                 }
 2466         }
 2467         /* There was no valid prison - perhaps there was a dying one. */
 2468         if (deadpr != NULL) {
 2469                 mtx_lock(&deadpr->pr_mtx);
 2470                 if (deadpr->pr_ref == 0) {
 2471                         mtx_unlock(&deadpr->pr_mtx);
 2472                         goto again;
 2473                 }
 2474         }
 2475         return (deadpr);
 2476 }
 2477 
 2478 /*
 2479  * See if a prison has the specific flag set.
 2480  */
 2481 int
 2482 prison_flag(struct ucred *cred, unsigned flag)
 2483 {
 2484 
 2485         /* This is an atomic read, so no locking is necessary. */
 2486         return (cred->cr_prison->pr_flags & flag);
 2487 }
 2488 
 2489 int
 2490 prison_allow(struct ucred *cred, unsigned flag)
 2491 {
 2492 
 2493         /* This is an atomic read, so no locking is necessary. */
 2494         return (cred->cr_prison->pr_allow & flag);
 2495 }
 2496 
 2497 /*
 2498  * Remove a prison reference.  If that was the last reference, remove the
 2499  * prison itself - but not in this context in case there are locks held.
 2500  */
 2501 void
 2502 prison_free_locked(struct prison *pr)
 2503 {
 2504 
 2505         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2506         pr->pr_ref--;
 2507         if (pr->pr_ref == 0) {
 2508                 mtx_unlock(&pr->pr_mtx);
 2509                 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
 2510                 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
 2511                 return;
 2512         }
 2513         mtx_unlock(&pr->pr_mtx);
 2514 }
 2515 
 2516 void
 2517 prison_free(struct prison *pr)
 2518 {
 2519 
 2520         mtx_lock(&pr->pr_mtx);
 2521         prison_free_locked(pr);
 2522 }
 2523 
 2524 static void
 2525 prison_complete(void *context, int pending)
 2526 {
 2527 
 2528         prison_deref((struct prison *)context, 0);
 2529 }
 2530 
 2531 /*
 2532  * Remove a prison reference (usually).  This internal version assumes no
 2533  * mutexes are held, except perhaps the prison itself.  If there are no more
 2534  * references, release and delist the prison.  On completion, the prison lock
 2535  * and the allprison lock are both unlocked.
 2536  */
 2537 static void
 2538 prison_deref(struct prison *pr, int flags)
 2539 {
 2540         struct prison *ppr, *tpr;
 2541 
 2542         if (!(flags & PD_LOCKED))
 2543                 mtx_lock(&pr->pr_mtx);
 2544         for (;;) {
 2545                 if (flags & PD_DEUREF) {
 2546                         pr->pr_uref--;
 2547                         KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
 2548                 }
 2549                 if (flags & PD_DEREF)
 2550                         pr->pr_ref--;
 2551                 /* If the prison still has references, nothing else to do. */
 2552                 if (pr->pr_ref > 0) {
 2553                         mtx_unlock(&pr->pr_mtx);
 2554                         if (flags & PD_LIST_SLOCKED)
 2555                                 sx_sunlock(&allprison_lock);
 2556                         else if (flags & PD_LIST_XLOCKED)
 2557                                 sx_xunlock(&allprison_lock);
 2558                         return;
 2559                 }
 2560 
 2561                 mtx_unlock(&pr->pr_mtx);
 2562                 if (flags & PD_LIST_SLOCKED) {
 2563                         if (!sx_try_upgrade(&allprison_lock)) {
 2564                                 sx_sunlock(&allprison_lock);
 2565                                 sx_xlock(&allprison_lock);
 2566                         }
 2567                 } else if (!(flags & PD_LIST_XLOCKED))
 2568                         sx_xlock(&allprison_lock);
 2569 
 2570                 TAILQ_REMOVE(&allprison, pr, pr_list);
 2571                 LIST_REMOVE(pr, pr_sibling);
 2572                 ppr = pr->pr_parent;
 2573                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 2574                         tpr->pr_childcount--;
 2575                 sx_xunlock(&allprison_lock);
 2576 
 2577 #ifdef VIMAGE
 2578                 if (pr->pr_vnet != ppr->pr_vnet)
 2579                         vnet_destroy(pr->pr_vnet);
 2580 #endif
 2581                 if (pr->pr_root != NULL)
 2582                         vrele(pr->pr_root);
 2583                 mtx_destroy(&pr->pr_mtx);
 2584 #ifdef INET
 2585                 free(pr->pr_ip4, M_PRISON);
 2586 #endif
 2587 #ifdef INET6
 2588                 free(pr->pr_ip6, M_PRISON);
 2589 #endif
 2590                 if (pr->pr_cpuset != NULL)
 2591                         cpuset_rel(pr->pr_cpuset);
 2592                 osd_jail_exit(pr);
 2593 #ifdef RACCT
 2594                 prison_racct_detach(pr);
 2595 #endif
 2596                 free(pr, M_PRISON);
 2597 
 2598                 /* Removing a prison frees a reference on its parent. */
 2599                 pr = ppr;
 2600                 mtx_lock(&pr->pr_mtx);
 2601                 flags = PD_DEREF | PD_DEUREF;
 2602         }
 2603 }
 2604 
 2605 void
 2606 prison_hold_locked(struct prison *pr)
 2607 {
 2608 
 2609         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2610         KASSERT(pr->pr_ref > 0,
 2611             ("Trying to hold dead prison (jid=%d).", pr->pr_id));
 2612         pr->pr_ref++;
 2613 }
 2614 
 2615 void
 2616 prison_hold(struct prison *pr)
 2617 {
 2618 
 2619         mtx_lock(&pr->pr_mtx);
 2620         prison_hold_locked(pr);
 2621         mtx_unlock(&pr->pr_mtx);
 2622 }
 2623 
 2624 void
 2625 prison_proc_hold(struct prison *pr)
 2626 {
 2627 
 2628         mtx_lock(&pr->pr_mtx);
 2629         KASSERT(pr->pr_uref > 0,
 2630             ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
 2631         pr->pr_uref++;
 2632         mtx_unlock(&pr->pr_mtx);
 2633 }
 2634 
 2635 void
 2636 prison_proc_free(struct prison *pr)
 2637 {
 2638 
 2639         mtx_lock(&pr->pr_mtx);
 2640         KASSERT(pr->pr_uref > 0,
 2641             ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
 2642         prison_deref(pr, PD_DEUREF | PD_LOCKED);
 2643 }
 2644 
 2645 
 2646 #ifdef INET
 2647 /*
 2648  * Restrict a prison's IP address list with its parent's, possibly replacing
 2649  * it.  Return true if the replacement buffer was used (or would have been).
 2650  */
 2651 static int
 2652 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
 2653 {
 2654         int ii, ij, used;
 2655         struct prison *ppr;
 2656 
 2657         ppr = pr->pr_parent;
 2658         if (!(pr->pr_flags & PR_IP4_USER)) {
 2659                 /* This has no user settings, so just copy the parent's list. */
 2660                 if (pr->pr_ip4s < ppr->pr_ip4s) {
 2661                         /*
 2662                          * There's no room for the parent's list.  Use the
 2663                          * new list buffer, which is assumed to be big enough
 2664                          * (if it was passed).  If there's no buffer, try to
 2665                          * allocate one.
 2666                          */
 2667                         used = 1;
 2668                         if (newip4 == NULL) {
 2669                                 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
 2670                                     M_PRISON, M_NOWAIT);
 2671                                 if (newip4 != NULL)
 2672                                         used = 0;
 2673                         }
 2674                         if (newip4 != NULL) {
 2675                                 bcopy(ppr->pr_ip4, newip4,
 2676                                     ppr->pr_ip4s * sizeof(*newip4));
 2677                                 free(pr->pr_ip4, M_PRISON);
 2678                                 pr->pr_ip4 = newip4;
 2679                                 pr->pr_ip4s = ppr->pr_ip4s;
 2680                         }
 2681                         return (used);
 2682                 }
 2683                 pr->pr_ip4s = ppr->pr_ip4s;
 2684                 if (pr->pr_ip4s > 0)
 2685                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 2686                             pr->pr_ip4s * sizeof(*newip4));
 2687                 else if (pr->pr_ip4 != NULL) {
 2688                         free(pr->pr_ip4, M_PRISON);
 2689                         pr->pr_ip4 = NULL;
 2690                 }
 2691         } else if (pr->pr_ip4s > 0) {
 2692                 /* Remove addresses that aren't in the parent. */
 2693                 for (ij = 0; ij < ppr->pr_ip4s; ij++)
 2694                         if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 2695                                 break;
 2696                 if (ij < ppr->pr_ip4s)
 2697                         ii = 1;
 2698                 else {
 2699                         bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
 2700                             --pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2701                         ii = 0;
 2702                 }
 2703                 for (ij = 1; ii < pr->pr_ip4s; ) {
 2704                         if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
 2705                                 ii++;
 2706                                 continue;
 2707                         }
 2708                         switch (ij >= ppr->pr_ip4s ? -1 :
 2709                                 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
 2710                         case -1:
 2711                                 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
 2712                                     (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
 2713                                 break;
 2714                         case 0:
 2715                                 ii++;
 2716                                 ij++;
 2717                                 break;
 2718                         case 1:
 2719                                 ij++;
 2720                                 break;
 2721                         }
 2722                 }
 2723                 if (pr->pr_ip4s == 0) {
 2724                         pr->pr_flags |= PR_IP4_DISABLE;
 2725                         free(pr->pr_ip4, M_PRISON);
 2726                         pr->pr_ip4 = NULL;
 2727                 }
 2728         }
 2729         return (0);
 2730 }
 2731 
 2732 /*
 2733  * Pass back primary IPv4 address of this jail.
 2734  *
 2735  * If not restricted return success but do not alter the address.  Caller has
 2736  * to make sure to initialize it correctly (e.g. INADDR_ANY).
 2737  *
 2738  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 2739  * Address returned in NBO.
 2740  */
 2741 int
 2742 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
 2743 {
 2744         struct prison *pr;
 2745 
 2746         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2747         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2748 
 2749         pr = cred->cr_prison;
 2750         if (!(pr->pr_flags & PR_IP4))
 2751                 return (0);
 2752         mtx_lock(&pr->pr_mtx);
 2753         if (!(pr->pr_flags & PR_IP4)) {
 2754                 mtx_unlock(&pr->pr_mtx);
 2755                 return (0);
 2756         }
 2757         if (pr->pr_ip4 == NULL) {
 2758                 mtx_unlock(&pr->pr_mtx);
 2759                 return (EAFNOSUPPORT);
 2760         }
 2761 
 2762         ia->s_addr = pr->pr_ip4[0].s_addr;
 2763         mtx_unlock(&pr->pr_mtx);
 2764         return (0);
 2765 }
 2766 
 2767 /*
 2768  * Return 1 if we should do proper source address selection or are not jailed.
 2769  * We will return 0 if we should bypass source address selection in favour
 2770  * of the primary jail IPv4 address. Only in this case *ia will be updated and
 2771  * returned in NBO.
 2772  * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
 2773  */
 2774 int
 2775 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
 2776 {
 2777         struct prison *pr;
 2778         struct in_addr lia;
 2779         int error;
 2780 
 2781         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2782         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2783 
 2784         if (!jailed(cred))
 2785                 return (1);
 2786 
 2787         pr = cred->cr_prison;
 2788         if (pr->pr_flags & PR_IP4_SADDRSEL)
 2789                 return (1);
 2790 
 2791         lia.s_addr = INADDR_ANY;
 2792         error = prison_get_ip4(cred, &lia);
 2793         if (error)
 2794                 return (error);
 2795         if (lia.s_addr == INADDR_ANY)
 2796                 return (1);
 2797 
 2798         ia->s_addr = lia.s_addr;
 2799         return (0);
 2800 }
 2801 
 2802 /*
 2803  * Return true if pr1 and pr2 have the same IPv4 address restrictions.
 2804  */
 2805 int
 2806 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
 2807 {
 2808 
 2809         if (pr1 == pr2)
 2810                 return (1);
 2811 
 2812         /*
 2813          * No need to lock since the PR_IP4_USER flag can't be altered for
 2814          * existing prisons.
 2815          */
 2816         while (pr1 != &prison0 &&
 2817 #ifdef VIMAGE
 2818                !(pr1->pr_flags & PR_VNET) &&
 2819 #endif
 2820                !(pr1->pr_flags & PR_IP4_USER))
 2821                 pr1 = pr1->pr_parent;
 2822         while (pr2 != &prison0 &&
 2823 #ifdef VIMAGE
 2824                !(pr2->pr_flags & PR_VNET) &&
 2825 #endif
 2826                !(pr2->pr_flags & PR_IP4_USER))
 2827                 pr2 = pr2->pr_parent;
 2828         return (pr1 == pr2);
 2829 }
 2830 
 2831 /*
 2832  * Make sure our (source) address is set to something meaningful to this
 2833  * jail.
 2834  *
 2835  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 2836  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 2837  * doesn't allow IPv4.  Address passed in in NBO and returned in NBO.
 2838  */
 2839 int
 2840 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
 2841 {
 2842         struct prison *pr;
 2843         struct in_addr ia0;
 2844         int error;
 2845 
 2846         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2847         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2848 
 2849         pr = cred->cr_prison;
 2850         if (!(pr->pr_flags & PR_IP4))
 2851                 return (0);
 2852         mtx_lock(&pr->pr_mtx);
 2853         if (!(pr->pr_flags & PR_IP4)) {
 2854                 mtx_unlock(&pr->pr_mtx);
 2855                 return (0);
 2856         }
 2857         if (pr->pr_ip4 == NULL) {
 2858                 mtx_unlock(&pr->pr_mtx);
 2859                 return (EAFNOSUPPORT);
 2860         }
 2861 
 2862         ia0.s_addr = ntohl(ia->s_addr);
 2863         if (ia0.s_addr == INADDR_LOOPBACK) {
 2864                 ia->s_addr = pr->pr_ip4[0].s_addr;
 2865                 mtx_unlock(&pr->pr_mtx);
 2866                 return (0);
 2867         }
 2868 
 2869         if (ia0.s_addr == INADDR_ANY) {
 2870                 /*
 2871                  * In case there is only 1 IPv4 address, bind directly.
 2872                  */
 2873                 if (pr->pr_ip4s == 1)
 2874                         ia->s_addr = pr->pr_ip4[0].s_addr;
 2875                 mtx_unlock(&pr->pr_mtx);
 2876                 return (0);
 2877         }
 2878 
 2879         error = _prison_check_ip4(pr, ia);
 2880         mtx_unlock(&pr->pr_mtx);
 2881         return (error);
 2882 }
 2883 
 2884 /*
 2885  * Rewrite destination address in case we will connect to loopback address.
 2886  *
 2887  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 2888  * Address passed in in NBO and returned in NBO.
 2889  */
 2890 int
 2891 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
 2892 {
 2893         struct prison *pr;
 2894 
 2895         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2896         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2897 
 2898         pr = cred->cr_prison;
 2899         if (!(pr->pr_flags & PR_IP4))
 2900                 return (0);
 2901         mtx_lock(&pr->pr_mtx);
 2902         if (!(pr->pr_flags & PR_IP4)) {
 2903                 mtx_unlock(&pr->pr_mtx);
 2904                 return (0);
 2905         }
 2906         if (pr->pr_ip4 == NULL) {
 2907                 mtx_unlock(&pr->pr_mtx);
 2908                 return (EAFNOSUPPORT);
 2909         }
 2910 
 2911         if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
 2912                 ia->s_addr = pr->pr_ip4[0].s_addr;
 2913                 mtx_unlock(&pr->pr_mtx);
 2914                 return (0);
 2915         }
 2916 
 2917         /*
 2918          * Return success because nothing had to be changed.
 2919          */
 2920         mtx_unlock(&pr->pr_mtx);
 2921         return (0);
 2922 }
 2923 
 2924 /*
 2925  * Check if given address belongs to the jail referenced by cred/prison.
 2926  *
 2927  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 2928  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 2929  * doesn't allow IPv4.  Address passed in in NBO.
 2930  */
 2931 static int
 2932 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
 2933 {
 2934         int i, a, z, d;
 2935 
 2936         /*
 2937          * Check the primary IP.
 2938          */
 2939         if (pr->pr_ip4[0].s_addr == ia->s_addr)
 2940                 return (0);
 2941 
 2942         /*
 2943          * All the other IPs are sorted so we can do a binary search.
 2944          */
 2945         a = 0;
 2946         z = pr->pr_ip4s - 2;
 2947         while (a <= z) {
 2948                 i = (a + z) / 2;
 2949                 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
 2950                 if (d > 0)
 2951                         z = i - 1;
 2952                 else if (d < 0)
 2953                         a = i + 1;
 2954                 else
 2955                         return (0);
 2956         }
 2957 
 2958         return (EADDRNOTAVAIL);
 2959 }
 2960 
 2961 int
 2962 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
 2963 {
 2964         struct prison *pr;
 2965         int error;
 2966 
 2967         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2968         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2969 
 2970         pr = cred->cr_prison;
 2971         if (!(pr->pr_flags & PR_IP4))
 2972                 return (0);
 2973         mtx_lock(&pr->pr_mtx);
 2974         if (!(pr->pr_flags & PR_IP4)) {
 2975                 mtx_unlock(&pr->pr_mtx);
 2976                 return (0);
 2977         }
 2978         if (pr->pr_ip4 == NULL) {
 2979                 mtx_unlock(&pr->pr_mtx);
 2980                 return (EAFNOSUPPORT);
 2981         }
 2982 
 2983         error = _prison_check_ip4(pr, ia);
 2984         mtx_unlock(&pr->pr_mtx);
 2985         return (error);
 2986 }
 2987 #endif
 2988 
 2989 #ifdef INET6
 2990 static int
 2991 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
 2992 {
 2993         int ii, ij, used;
 2994         struct prison *ppr;
 2995 
 2996         ppr = pr->pr_parent;
 2997         if (!(pr->pr_flags & PR_IP6_USER)) {
 2998                 /* This has no user settings, so just copy the parent's list. */
 2999                 if (pr->pr_ip6s < ppr->pr_ip6s) {
 3000                         /*
 3001                          * There's no room for the parent's list.  Use the
 3002                          * new list buffer, which is assumed to be big enough
 3003                          * (if it was passed).  If there's no buffer, try to
 3004                          * allocate one.
 3005                          */
 3006                         used = 1;
 3007                         if (newip6 == NULL) {
 3008                                 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
 3009                                     M_PRISON, M_NOWAIT);
 3010                                 if (newip6 != NULL)
 3011                                         used = 0;
 3012                         }
 3013                         if (newip6 != NULL) {
 3014                                 bcopy(ppr->pr_ip6, newip6,
 3015                                     ppr->pr_ip6s * sizeof(*newip6));
 3016                                 free(pr->pr_ip6, M_PRISON);
 3017                                 pr->pr_ip6 = newip6;
 3018                                 pr->pr_ip6s = ppr->pr_ip6s;
 3019                         }
 3020                         return (used);
 3021                 }
 3022                 pr->pr_ip6s = ppr->pr_ip6s;
 3023                 if (pr->pr_ip6s > 0)
 3024                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 3025                             pr->pr_ip6s * sizeof(*newip6));
 3026                 else if (pr->pr_ip6 != NULL) {
 3027                         free(pr->pr_ip6, M_PRISON);
 3028                         pr->pr_ip6 = NULL;
 3029                 }
 3030         } else if (pr->pr_ip6s > 0) {
 3031                 /* Remove addresses that aren't in the parent. */
 3032                 for (ij = 0; ij < ppr->pr_ip6s; ij++)
 3033                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
 3034                             &ppr->pr_ip6[ij]))
 3035                                 break;
 3036                 if (ij < ppr->pr_ip6s)
 3037                         ii = 1;
 3038                 else {
 3039                         bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
 3040                             --pr->pr_ip6s * sizeof(*pr->pr_ip6));
 3041                         ii = 0;
 3042                 }
 3043                 for (ij = 1; ii < pr->pr_ip6s; ) {
 3044                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
 3045                             &ppr->pr_ip6[0])) {
 3046                                 ii++;
 3047                                 continue;
 3048                         }
 3049                         switch (ij >= ppr->pr_ip4s ? -1 :
 3050                                 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
 3051                         case -1:
 3052                                 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
 3053                                     (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
 3054                                 break;
 3055                         case 0:
 3056                                 ii++;
 3057                                 ij++;
 3058                                 break;
 3059                         case 1:
 3060                                 ij++;
 3061                                 break;
 3062                         }
 3063                 }
 3064                 if (pr->pr_ip6s == 0) {
 3065                         pr->pr_flags |= PR_IP6_DISABLE;
 3066                         free(pr->pr_ip6, M_PRISON);
 3067                         pr->pr_ip6 = NULL;
 3068                 }
 3069         }
 3070         return 0;
 3071 }
 3072 
 3073 /*
 3074  * Pass back primary IPv6 address for this jail.
 3075  *
 3076  * If not restricted return success but do not alter the address.  Caller has
 3077  * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
 3078  *
 3079  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3080  */
 3081 int
 3082 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
 3083 {
 3084         struct prison *pr;
 3085 
 3086         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3087         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3088 
 3089         pr = cred->cr_prison;
 3090         if (!(pr->pr_flags & PR_IP6))
 3091                 return (0);
 3092         mtx_lock(&pr->pr_mtx);
 3093         if (!(pr->pr_flags & PR_IP6)) {
 3094                 mtx_unlock(&pr->pr_mtx);
 3095                 return (0);
 3096         }
 3097         if (pr->pr_ip6 == NULL) {
 3098                 mtx_unlock(&pr->pr_mtx);
 3099                 return (EAFNOSUPPORT);
 3100         }
 3101 
 3102         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3103         mtx_unlock(&pr->pr_mtx);
 3104         return (0);
 3105 }
 3106 
 3107 /*
 3108  * Return 1 if we should do proper source address selection or are not jailed.
 3109  * We will return 0 if we should bypass source address selection in favour
 3110  * of the primary jail IPv6 address. Only in this case *ia will be updated and
 3111  * returned in NBO.
 3112  * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
 3113  */
 3114 int
 3115 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
 3116 {
 3117         struct prison *pr;
 3118         struct in6_addr lia6;
 3119         int error;
 3120 
 3121         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3122         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3123 
 3124         if (!jailed(cred))
 3125                 return (1);
 3126 
 3127         pr = cred->cr_prison;
 3128         if (pr->pr_flags & PR_IP6_SADDRSEL)
 3129                 return (1);
 3130 
 3131         lia6 = in6addr_any;
 3132         error = prison_get_ip6(cred, &lia6);
 3133         if (error)
 3134                 return (error);
 3135         if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
 3136                 return (1);
 3137 
 3138         bcopy(&lia6, ia6, sizeof(struct in6_addr));
 3139         return (0);
 3140 }
 3141 
 3142 /*
 3143  * Return true if pr1 and pr2 have the same IPv6 address restrictions.
 3144  */
 3145 int
 3146 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
 3147 {
 3148 
 3149         if (pr1 == pr2)
 3150                 return (1);
 3151 
 3152         while (pr1 != &prison0 &&
 3153 #ifdef VIMAGE
 3154                !(pr1->pr_flags & PR_VNET) &&
 3155 #endif
 3156                !(pr1->pr_flags & PR_IP6_USER))
 3157                 pr1 = pr1->pr_parent;
 3158         while (pr2 != &prison0 &&
 3159 #ifdef VIMAGE
 3160                !(pr2->pr_flags & PR_VNET) &&
 3161 #endif
 3162                !(pr2->pr_flags & PR_IP6_USER))
 3163                 pr2 = pr2->pr_parent;
 3164         return (pr1 == pr2);
 3165 }
 3166 
 3167 /*
 3168  * Make sure our (source) address is set to something meaningful to this jail.
 3169  *
 3170  * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
 3171  * when needed while binding.
 3172  *
 3173  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3174  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3175  * doesn't allow IPv6.
 3176  */
 3177 int
 3178 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
 3179 {
 3180         struct prison *pr;
 3181         int error;
 3182 
 3183         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3184         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3185 
 3186         pr = cred->cr_prison;
 3187         if (!(pr->pr_flags & PR_IP6))
 3188                 return (0);
 3189         mtx_lock(&pr->pr_mtx);
 3190         if (!(pr->pr_flags & PR_IP6)) {
 3191                 mtx_unlock(&pr->pr_mtx);
 3192                 return (0);
 3193         }
 3194         if (pr->pr_ip6 == NULL) {
 3195                 mtx_unlock(&pr->pr_mtx);
 3196                 return (EAFNOSUPPORT);
 3197         }
 3198 
 3199         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3200                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3201                 mtx_unlock(&pr->pr_mtx);
 3202                 return (0);
 3203         }
 3204 
 3205         if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
 3206                 /*
 3207                  * In case there is only 1 IPv6 address, and v6only is true,
 3208                  * then bind directly.
 3209                  */
 3210                 if (v6only != 0 && pr->pr_ip6s == 1)
 3211                         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3212                 mtx_unlock(&pr->pr_mtx);
 3213                 return (0);
 3214         }
 3215 
 3216         error = _prison_check_ip6(pr, ia6);
 3217         mtx_unlock(&pr->pr_mtx);
 3218         return (error);
 3219 }
 3220 
 3221 /*
 3222  * Rewrite destination address in case we will connect to loopback address.
 3223  *
 3224  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3225  */
 3226 int
 3227 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
 3228 {
 3229         struct prison *pr;
 3230 
 3231         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3232         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3233 
 3234         pr = cred->cr_prison;
 3235         if (!(pr->pr_flags & PR_IP6))
 3236                 return (0);
 3237         mtx_lock(&pr->pr_mtx);
 3238         if (!(pr->pr_flags & PR_IP6)) {
 3239                 mtx_unlock(&pr->pr_mtx);
 3240                 return (0);
 3241         }
 3242         if (pr->pr_ip6 == NULL) {
 3243                 mtx_unlock(&pr->pr_mtx);
 3244                 return (EAFNOSUPPORT);
 3245         }
 3246 
 3247         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3248                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3249                 mtx_unlock(&pr->pr_mtx);
 3250                 return (0);
 3251         }
 3252 
 3253         /*
 3254          * Return success because nothing had to be changed.
 3255          */
 3256         mtx_unlock(&pr->pr_mtx);
 3257         return (0);
 3258 }
 3259 
 3260 /*
 3261  * Check if given address belongs to the jail referenced by cred/prison.
 3262  *
 3263  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3264  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3265  * doesn't allow IPv6.
 3266  */
 3267 static int
 3268 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
 3269 {
 3270         int i, a, z, d;
 3271 
 3272         /*
 3273          * Check the primary IP.
 3274          */
 3275         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
 3276                 return (0);
 3277 
 3278         /*
 3279          * All the other IPs are sorted so we can do a binary search.
 3280          */
 3281         a = 0;
 3282         z = pr->pr_ip6s - 2;
 3283         while (a <= z) {
 3284                 i = (a + z) / 2;
 3285                 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
 3286                 if (d > 0)
 3287                         z = i - 1;
 3288                 else if (d < 0)
 3289                         a = i + 1;
 3290                 else
 3291                         return (0);
 3292         }
 3293 
 3294         return (EADDRNOTAVAIL);
 3295 }
 3296 
 3297 int
 3298 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
 3299 {
 3300         struct prison *pr;
 3301         int error;
 3302 
 3303         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3304         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3305 
 3306         pr = cred->cr_prison;
 3307         if (!(pr->pr_flags & PR_IP6))
 3308                 return (0);
 3309         mtx_lock(&pr->pr_mtx);
 3310         if (!(pr->pr_flags & PR_IP6)) {
 3311                 mtx_unlock(&pr->pr_mtx);
 3312                 return (0);
 3313         }
 3314         if (pr->pr_ip6 == NULL) {
 3315                 mtx_unlock(&pr->pr_mtx);
 3316                 return (EAFNOSUPPORT);
 3317         }
 3318 
 3319         error = _prison_check_ip6(pr, ia6);
 3320         mtx_unlock(&pr->pr_mtx);
 3321         return (error);
 3322 }
 3323 #endif
 3324 
 3325 /*
 3326  * Check if a jail supports the given address family.
 3327  *
 3328  * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
 3329  * if not.
 3330  */
 3331 int
 3332 prison_check_af(struct ucred *cred, int af)
 3333 {
 3334         struct prison *pr;
 3335         int error;
 3336 
 3337         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3338 
 3339         pr = cred->cr_prison;
 3340 #ifdef VIMAGE
 3341         /* Prisons with their own network stack are not limited. */
 3342         if (prison_owns_vnet(cred))
 3343                 return (0);
 3344 #endif
 3345 
 3346         error = 0;
 3347         switch (af)
 3348         {
 3349 #ifdef INET
 3350         case AF_INET:
 3351                 if (pr->pr_flags & PR_IP4)
 3352                 {
 3353                         mtx_lock(&pr->pr_mtx);
 3354                         if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
 3355                                 error = EAFNOSUPPORT;
 3356                         mtx_unlock(&pr->pr_mtx);
 3357                 }
 3358                 break;
 3359 #endif
 3360 #ifdef INET6
 3361         case AF_INET6:
 3362                 if (pr->pr_flags & PR_IP6)
 3363                 {
 3364                         mtx_lock(&pr->pr_mtx);
 3365                         if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
 3366                                 error = EAFNOSUPPORT;
 3367                         mtx_unlock(&pr->pr_mtx);
 3368                 }
 3369                 break;
 3370 #endif
 3371         case AF_LOCAL:
 3372         case AF_ROUTE:
 3373                 break;
 3374         default:
 3375                 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
 3376                         error = EAFNOSUPPORT;
 3377         }
 3378         return (error);
 3379 }
 3380 
 3381 /*
 3382  * Check if given address belongs to the jail referenced by cred (wrapper to
 3383  * prison_check_ip[46]).
 3384  *
 3385  * Returns 0 if jail doesn't restrict the address family or if address belongs
 3386  * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
 3387  * the jail doesn't allow the address family.  IPv4 Address passed in in NBO.
 3388  */
 3389 int
 3390 prison_if(struct ucred *cred, struct sockaddr *sa)
 3391 {
 3392 #ifdef INET
 3393         struct sockaddr_in *sai;
 3394 #endif
 3395 #ifdef INET6
 3396         struct sockaddr_in6 *sai6;
 3397 #endif
 3398         int error;
 3399 
 3400         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3401         KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
 3402 
 3403 #ifdef VIMAGE
 3404         if (prison_owns_vnet(cred))
 3405                 return (0);
 3406 #endif
 3407 
 3408         error = 0;
 3409         switch (sa->sa_family)
 3410         {
 3411 #ifdef INET
 3412         case AF_INET:
 3413                 sai = (struct sockaddr_in *)sa;
 3414                 error = prison_check_ip4(cred, &sai->sin_addr);
 3415                 break;
 3416 #endif
 3417 #ifdef INET6
 3418         case AF_INET6:
 3419                 sai6 = (struct sockaddr_in6 *)sa;
 3420                 error = prison_check_ip6(cred, &sai6->sin6_addr);
 3421                 break;
 3422 #endif
 3423         default:
 3424                 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
 3425                         error = EAFNOSUPPORT;
 3426         }
 3427         return (error);
 3428 }
 3429 
 3430 /*
 3431  * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
 3432  */
 3433 int
 3434 prison_check(struct ucred *cred1, struct ucred *cred2)
 3435 {
 3436 
 3437         return ((cred1->cr_prison == cred2->cr_prison ||
 3438             prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
 3439 }
 3440 
 3441 /*
 3442  * Return 1 if p2 is a child of p1, otherwise 0.
 3443  */
 3444 int
 3445 prison_ischild(struct prison *pr1, struct prison *pr2)
 3446 {
 3447 
 3448         for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
 3449                 if (pr1 == pr2)
 3450                         return (1);
 3451         return (0);
 3452 }
 3453 
 3454 /*
 3455  * Return 1 if the passed credential is in a jail, otherwise 0.
 3456  */
 3457 int
 3458 jailed(struct ucred *cred)
 3459 {
 3460 
 3461         return (cred->cr_prison != &prison0);
 3462 }
 3463 
 3464 /*
 3465  * Return 1 if the passed credential is in a jail and that jail does not
 3466  * have its own virtual network stack, otherwise 0.
 3467  */
 3468 int
 3469 jailed_without_vnet(struct ucred *cred)
 3470 {
 3471 
 3472         if (!jailed(cred))
 3473                 return (0);
 3474 #ifdef VIMAGE
 3475         if (prison_owns_vnet(cred))
 3476                 return (0);
 3477 #endif
 3478 
 3479         return (1);
 3480 }
 3481 
 3482 /*
 3483  * Return the correct hostname (domainname, et al) for the passed credential.
 3484  */
 3485 void
 3486 getcredhostname(struct ucred *cred, char *buf, size_t size)
 3487 {
 3488         struct prison *pr;
 3489 
 3490         /*
 3491          * A NULL credential can be used to shortcut to the physical
 3492          * system's hostname.
 3493          */
 3494         pr = (cred != NULL) ? cred->cr_prison : &prison0;
 3495         mtx_lock(&pr->pr_mtx);
 3496         strlcpy(buf, pr->pr_hostname, size);
 3497         mtx_unlock(&pr->pr_mtx);
 3498 }
 3499 
 3500 void
 3501 getcreddomainname(struct ucred *cred, char *buf, size_t size)
 3502 {
 3503 
 3504         mtx_lock(&cred->cr_prison->pr_mtx);
 3505         strlcpy(buf, cred->cr_prison->pr_domainname, size);
 3506         mtx_unlock(&cred->cr_prison->pr_mtx);
 3507 }
 3508 
 3509 void
 3510 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
 3511 {
 3512 
 3513         mtx_lock(&cred->cr_prison->pr_mtx);
 3514         strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
 3515         mtx_unlock(&cred->cr_prison->pr_mtx);
 3516 }
 3517 
 3518 void
 3519 getcredhostid(struct ucred *cred, unsigned long *hostid)
 3520 {
 3521 
 3522         mtx_lock(&cred->cr_prison->pr_mtx);
 3523         *hostid = cred->cr_prison->pr_hostid;
 3524         mtx_unlock(&cred->cr_prison->pr_mtx);
 3525 }
 3526 
 3527 #ifdef VIMAGE
 3528 /*
 3529  * Determine whether the prison represented by cred owns
 3530  * its vnet rather than having it inherited.
 3531  *
 3532  * Returns 1 in case the prison owns the vnet, 0 otherwise.
 3533  */
 3534 int
 3535 prison_owns_vnet(struct ucred *cred)
 3536 {
 3537 
 3538         /*
 3539          * vnets cannot be added/removed after jail creation,
 3540          * so no need to lock here.
 3541          */
 3542         return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
 3543 }
 3544 #endif
 3545 
 3546 /*
 3547  * Determine whether the subject represented by cred can "see"
 3548  * status of a mount point.
 3549  * Returns: 0 for permitted, ENOENT otherwise.
 3550  * XXX: This function should be called cr_canseemount() and should be
 3551  *      placed in kern_prot.c.
 3552  */
 3553 int
 3554 prison_canseemount(struct ucred *cred, struct mount *mp)
 3555 {
 3556         struct prison *pr;
 3557         struct statfs *sp;
 3558         size_t len;
 3559 
 3560         pr = cred->cr_prison;
 3561         if (pr->pr_enforce_statfs == 0)
 3562                 return (0);
 3563         if (pr->pr_root->v_mount == mp)
 3564                 return (0);
 3565         if (pr->pr_enforce_statfs == 2)
 3566                 return (ENOENT);
 3567         /*
 3568          * If jail's chroot directory is set to "/" we should be able to see
 3569          * all mount-points from inside a jail.
 3570          * This is ugly check, but this is the only situation when jail's
 3571          * directory ends with '/'.
 3572          */
 3573         if (strcmp(pr->pr_path, "/") == 0)
 3574                 return (0);
 3575         len = strlen(pr->pr_path);
 3576         sp = &mp->mnt_stat;
 3577         if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
 3578                 return (ENOENT);
 3579         /*
 3580          * Be sure that we don't have situation where jail's root directory
 3581          * is "/some/path" and mount point is "/some/pathpath".
 3582          */
 3583         if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
 3584                 return (ENOENT);
 3585         return (0);
 3586 }
 3587 
 3588 void
 3589 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
 3590 {
 3591         char jpath[MAXPATHLEN];
 3592         struct prison *pr;
 3593         size_t len;
 3594 
 3595         pr = cred->cr_prison;
 3596         if (pr->pr_enforce_statfs == 0)
 3597                 return;
 3598         if (prison_canseemount(cred, mp) != 0) {
 3599                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3600                 strlcpy(sp->f_mntonname, "[restricted]",
 3601                     sizeof(sp->f_mntonname));
 3602                 return;
 3603         }
 3604         if (pr->pr_root->v_mount == mp) {
 3605                 /*
 3606                  * Clear current buffer data, so we are sure nothing from
 3607                  * the valid path left there.
 3608                  */
 3609                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3610                 *sp->f_mntonname = '/';
 3611                 return;
 3612         }
 3613         /*
 3614          * If jail's chroot directory is set to "/" we should be able to see
 3615          * all mount-points from inside a jail.
 3616          */
 3617         if (strcmp(pr->pr_path, "/") == 0)
 3618                 return;
 3619         len = strlen(pr->pr_path);
 3620         strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
 3621         /*
 3622          * Clear current buffer data, so we are sure nothing from
 3623          * the valid path left there.
 3624          */
 3625         bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3626         if (*jpath == '\0') {
 3627                 /* Should never happen. */
 3628                 *sp->f_mntonname = '/';
 3629         } else {
 3630                 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
 3631         }
 3632 }
 3633 
 3634 /*
 3635  * Check with permission for a specific privilege is granted within jail.  We
 3636  * have a specific list of accepted privileges; the rest are denied.
 3637  */
 3638 int
 3639 prison_priv_check(struct ucred *cred, int priv)
 3640 {
 3641 
 3642         if (!jailed(cred))
 3643                 return (0);
 3644 
 3645 #ifdef VIMAGE
 3646         /*
 3647          * Privileges specific to prisons with a virtual network stack.
 3648          * There might be a duplicate entry here in case the privilege
 3649          * is only granted conditionally in the legacy jail case.
 3650          */
 3651         switch (priv) {
 3652 #ifdef notyet
 3653                 /*
 3654                  * NFS-specific privileges.
 3655                  */
 3656         case PRIV_NFS_DAEMON:
 3657         case PRIV_NFS_LOCKD:
 3658 #endif
 3659                 /*
 3660                  * Network stack privileges.
 3661                  */
 3662         case PRIV_NET_BRIDGE:
 3663         case PRIV_NET_GRE:
 3664         case PRIV_NET_BPF:
 3665         case PRIV_NET_RAW:              /* Dup, cond. in legacy jail case. */
 3666         case PRIV_NET_ROUTE:
 3667         case PRIV_NET_TAP:
 3668         case PRIV_NET_SETIFMTU:
 3669         case PRIV_NET_SETIFFLAGS:
 3670         case PRIV_NET_SETIFCAP:
 3671         case PRIV_NET_SETIFDESCR:
 3672         case PRIV_NET_SETIFNAME :
 3673         case PRIV_NET_SETIFMETRIC:
 3674         case PRIV_NET_SETIFPHYS:
 3675         case PRIV_NET_SETIFMAC:
 3676         case PRIV_NET_ADDMULTI:
 3677         case PRIV_NET_DELMULTI:
 3678         case PRIV_NET_HWIOCTL:
 3679         case PRIV_NET_SETLLADDR:
 3680         case PRIV_NET_ADDIFGROUP:
 3681         case PRIV_NET_DELIFGROUP:
 3682         case PRIV_NET_IFCREATE:
 3683         case PRIV_NET_IFDESTROY:
 3684         case PRIV_NET_ADDIFADDR:
 3685         case PRIV_NET_DELIFADDR:
 3686         case PRIV_NET_LAGG:
 3687         case PRIV_NET_GIF:
 3688         case PRIV_NET_SETIFVNET:
 3689         case PRIV_NET_SETIFFIB:
 3690 
 3691                 /*
 3692                  * 802.11-related privileges.
 3693                  */
 3694         case PRIV_NET80211_GETKEY:
 3695 #ifdef notyet
 3696         case PRIV_NET80211_MANAGE:              /* XXX-BZ discuss with sam@ */
 3697 #endif
 3698 
 3699 #ifdef notyet
 3700                 /*
 3701                  * AppleTalk privileges.
 3702                  */
 3703         case PRIV_NETATALK_RESERVEDPORT:
 3704 
 3705                 /*
 3706                  * ATM privileges.
 3707                  */
 3708         case PRIV_NETATM_CFG:
 3709         case PRIV_NETATM_ADD:
 3710         case PRIV_NETATM_DEL:
 3711         case PRIV_NETATM_SET:
 3712 
 3713                 /*
 3714                  * Bluetooth privileges.
 3715                  */
 3716         case PRIV_NETBLUETOOTH_RAW:
 3717 #endif
 3718 
 3719                 /*
 3720                  * Netgraph and netgraph module privileges.
 3721                  */
 3722         case PRIV_NETGRAPH_CONTROL:
 3723 #ifdef notyet
 3724         case PRIV_NETGRAPH_TTY:
 3725 #endif
 3726 
 3727                 /*
 3728                  * IPv4 and IPv6 privileges.
 3729                  */
 3730         case PRIV_NETINET_IPFW:
 3731         case PRIV_NETINET_DIVERT:
 3732         case PRIV_NETINET_PF:
 3733         case PRIV_NETINET_DUMMYNET:
 3734         case PRIV_NETINET_CARP:
 3735         case PRIV_NETINET_MROUTE:
 3736         case PRIV_NETINET_RAW:
 3737         case PRIV_NETINET_ADDRCTRL6:
 3738         case PRIV_NETINET_ND6:
 3739         case PRIV_NETINET_SCOPE6:
 3740         case PRIV_NETINET_ALIFETIME6:
 3741         case PRIV_NETINET_IPSEC:
 3742         case PRIV_NETINET_BINDANY:
 3743 
 3744 #ifdef notyet
 3745                 /*
 3746                  * IPX/SPX privileges.
 3747                  */
 3748         case PRIV_NETIPX_RESERVEDPORT:
 3749         case PRIV_NETIPX_RAW:
 3750 
 3751                 /*
 3752                  * NCP privileges.
 3753                  */
 3754         case PRIV_NETNCP:
 3755 
 3756                 /*
 3757                  * SMB privileges.
 3758                  */
 3759         case PRIV_NETSMB:
 3760 #endif
 3761 
 3762         /*
 3763          * No default: or deny here.
 3764          * In case of no permit fall through to next switch().
 3765          */
 3766                 if (cred->cr_prison->pr_flags & PR_VNET)
 3767                         return (0);
 3768         }
 3769 #endif /* VIMAGE */
 3770 
 3771         switch (priv) {
 3772 
 3773                 /*
 3774                  * Allow ktrace privileges for root in jail.
 3775                  */
 3776         case PRIV_KTRACE:
 3777 
 3778 #if 0
 3779                 /*
 3780                  * Allow jailed processes to configure audit identity and
 3781                  * submit audit records (login, etc).  In the future we may
 3782                  * want to further refine the relationship between audit and
 3783                  * jail.
 3784                  */
 3785         case PRIV_AUDIT_GETAUDIT:
 3786         case PRIV_AUDIT_SETAUDIT:
 3787         case PRIV_AUDIT_SUBMIT:
 3788 #endif
 3789 
 3790                 /*
 3791                  * Allow jailed processes to manipulate process UNIX
 3792                  * credentials in any way they see fit.
 3793                  */
 3794         case PRIV_CRED_SETUID:
 3795         case PRIV_CRED_SETEUID:
 3796         case PRIV_CRED_SETGID:
 3797         case PRIV_CRED_SETEGID:
 3798         case PRIV_CRED_SETGROUPS:
 3799         case PRIV_CRED_SETREUID:
 3800         case PRIV_CRED_SETREGID:
 3801         case PRIV_CRED_SETRESUID:
 3802         case PRIV_CRED_SETRESGID:
 3803 
 3804                 /*
 3805                  * Jail implements visibility constraints already, so allow
 3806                  * jailed root to override uid/gid-based constraints.
 3807                  */
 3808         case PRIV_SEEOTHERGIDS:
 3809         case PRIV_SEEOTHERUIDS:
 3810 
 3811                 /*
 3812                  * Jail implements inter-process debugging limits already, so
 3813                  * allow jailed root various debugging privileges.
 3814                  */
 3815         case PRIV_DEBUG_DIFFCRED:
 3816         case PRIV_DEBUG_SUGID:
 3817         case PRIV_DEBUG_UNPRIV:
 3818 
 3819                 /*
 3820                  * Allow jail to set various resource limits and login
 3821                  * properties, and for now, exceed process resource limits.
 3822                  */
 3823         case PRIV_PROC_LIMIT:
 3824         case PRIV_PROC_SETLOGIN:
 3825         case PRIV_PROC_SETRLIMIT:
 3826 
 3827                 /*
 3828                  * System V and POSIX IPC privileges are granted in jail.
 3829                  */
 3830         case PRIV_IPC_READ:
 3831         case PRIV_IPC_WRITE:
 3832         case PRIV_IPC_ADMIN:
 3833         case PRIV_IPC_MSGSIZE:
 3834         case PRIV_MQ_ADMIN:
 3835 
 3836                 /*
 3837                  * Jail operations within a jail work on child jails.
 3838                  */
 3839         case PRIV_JAIL_ATTACH:
 3840         case PRIV_JAIL_SET:
 3841         case PRIV_JAIL_REMOVE:
 3842 
 3843                 /*
 3844                  * Jail implements its own inter-process limits, so allow
 3845                  * root processes in jail to change scheduling on other
 3846                  * processes in the same jail.  Likewise for signalling.
 3847                  */
 3848         case PRIV_SCHED_DIFFCRED:
 3849         case PRIV_SCHED_CPUSET:
 3850         case PRIV_SIGNAL_DIFFCRED:
 3851         case PRIV_SIGNAL_SUGID:
 3852 
 3853                 /*
 3854                  * Allow jailed processes to write to sysctls marked as jail
 3855                  * writable.
 3856                  */
 3857         case PRIV_SYSCTL_WRITEJAIL:
 3858 
 3859                 /*
 3860                  * Allow root in jail to manage a variety of quota
 3861                  * properties.  These should likely be conditional on a
 3862                  * configuration option.
 3863                  */
 3864         case PRIV_VFS_GETQUOTA:
 3865         case PRIV_VFS_SETQUOTA:
 3866 
 3867                 /*
 3868                  * Since Jail relies on chroot() to implement file system
 3869                  * protections, grant many VFS privileges to root in jail.
 3870                  * Be careful to exclude mount-related and NFS-related
 3871                  * privileges.
 3872                  */
 3873         case PRIV_VFS_READ:
 3874         case PRIV_VFS_WRITE:
 3875         case PRIV_VFS_ADMIN:
 3876         case PRIV_VFS_EXEC:
 3877         case PRIV_VFS_LOOKUP:
 3878         case PRIV_VFS_BLOCKRESERVE:     /* XXXRW: Slightly surprising. */
 3879         case PRIV_VFS_CHFLAGS_DEV:
 3880         case PRIV_VFS_CHOWN:
 3881         case PRIV_VFS_CHROOT:
 3882         case PRIV_VFS_RETAINSUGID:
 3883         case PRIV_VFS_FCHROOT:
 3884         case PRIV_VFS_LINK:
 3885         case PRIV_VFS_SETGID:
 3886         case PRIV_VFS_STAT:
 3887         case PRIV_VFS_STICKYFILE:
 3888 
 3889                 /*
 3890                  * As in the non-jail case, non-root users are expected to be
 3891                  * able to read kernel/phyiscal memory (provided /dev/[k]mem
 3892                  * exists in the jail and they have permission to access it).
 3893                  */
 3894         case PRIV_KMEM_READ:
 3895                 return (0);
 3896 
 3897                 /*
 3898                  * Depending on the global setting, allow privilege of
 3899                  * setting system flags.
 3900                  */
 3901         case PRIV_VFS_SYSFLAGS:
 3902                 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
 3903                         return (0);
 3904                 else
 3905                         return (EPERM);
 3906 
 3907                 /*
 3908                  * Depending on the global setting, allow privilege of
 3909                  * mounting/unmounting file systems.
 3910                  */
 3911         case PRIV_VFS_MOUNT:
 3912         case PRIV_VFS_UNMOUNT:
 3913         case PRIV_VFS_MOUNT_NONUSER:
 3914         case PRIV_VFS_MOUNT_OWNER:
 3915                 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
 3916                     cred->cr_prison->pr_enforce_statfs < 2)
 3917                         return (0);
 3918                 else
 3919                         return (EPERM);
 3920 
 3921                 /*
 3922                  * Allow jailed root to bind reserved ports and reuse in-use
 3923                  * ports.
 3924                  */
 3925         case PRIV_NETINET_RESERVEDPORT:
 3926         case PRIV_NETINET_REUSEPORT:
 3927                 return (0);
 3928 
 3929                 /*
 3930                  * Allow jailed root to set certian IPv4/6 (option) headers.
 3931                  */
 3932         case PRIV_NETINET_SETHDROPTS:
 3933                 return (0);
 3934 
 3935                 /*
 3936                  * Conditionally allow creating raw sockets in jail.
 3937                  */
 3938         case PRIV_NETINET_RAW:
 3939                 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
 3940                         return (0);
 3941                 else
 3942                         return (EPERM);
 3943 
 3944                 /*
 3945                  * Since jail implements its own visibility limits on netstat
 3946                  * sysctls, allow getcred.  This allows identd to work in
 3947                  * jail.
 3948                  */
 3949         case PRIV_NETINET_GETCRED:
 3950                 return (0);
 3951 
 3952                 /*
 3953                  * Allow jailed root to set loginclass.
 3954                  */
 3955         case PRIV_PROC_SETLOGINCLASS:
 3956                 return (0);
 3957 
 3958         default:
 3959                 /*
 3960                  * In all remaining cases, deny the privilege request.  This
 3961                  * includes almost all network privileges, many system
 3962                  * configuration privileges.
 3963                  */
 3964                 return (EPERM);
 3965         }
 3966 }
 3967 
 3968 /*
 3969  * Return the part of pr2's name that is relative to pr1, or the whole name
 3970  * if it does not directly follow.
 3971  */
 3972 
 3973 char *
 3974 prison_name(struct prison *pr1, struct prison *pr2)
 3975 {
 3976         char *name;
 3977 
 3978         /* Jails see themselves as "" (if they see themselves at all). */
 3979         if (pr1 == pr2)
 3980                 return "";
 3981         name = pr2->pr_name;
 3982         if (prison_ischild(pr1, pr2)) {
 3983                 /*
 3984                  * pr1 isn't locked (and allprison_lock may not be either)
 3985                  * so its length can't be counted on.  But the number of dots
 3986                  * can be counted on - and counted.
 3987                  */
 3988                 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
 3989                         name = strchr(name, '.') + 1;
 3990         }
 3991         return (name);
 3992 }
 3993 
 3994 /*
 3995  * Return the part of pr2's path that is relative to pr1, or the whole path
 3996  * if it does not directly follow.
 3997  */
 3998 static char *
 3999 prison_path(struct prison *pr1, struct prison *pr2)
 4000 {
 4001         char *path1, *path2;
 4002         int len1;
 4003 
 4004         path1 = pr1->pr_path;
 4005         path2 = pr2->pr_path;
 4006         if (!strcmp(path1, "/"))
 4007                 return (path2);
 4008         len1 = strlen(path1);
 4009         if (strncmp(path1, path2, len1))
 4010                 return (path2);
 4011         if (path2[len1] == '\0')
 4012                 return "/";
 4013         if (path2[len1] == '/')
 4014                 return (path2 + len1);
 4015         return (path2);
 4016 }
 4017 
 4018 
 4019 /*
 4020  * Jail-related sysctls.
 4021  */
 4022 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
 4023     "Jails");
 4024 
 4025 static int
 4026 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
 4027 {
 4028         struct xprison *xp;
 4029         struct prison *pr, *cpr;
 4030 #ifdef INET
 4031         struct in_addr *ip4 = NULL;
 4032         int ip4s = 0;
 4033 #endif
 4034 #ifdef INET6
 4035         struct in6_addr *ip6 = NULL;
 4036         int ip6s = 0;
 4037 #endif
 4038         int descend, error;
 4039 
 4040         xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
 4041         pr = req->td->td_ucred->cr_prison;
 4042         error = 0;
 4043         sx_slock(&allprison_lock);
 4044         FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 4045 #if defined(INET) || defined(INET6)
 4046  again:
 4047 #endif
 4048                 mtx_lock(&cpr->pr_mtx);
 4049 #ifdef INET
 4050                 if (cpr->pr_ip4s > 0) {
 4051                         if (ip4s < cpr->pr_ip4s) {
 4052                                 ip4s = cpr->pr_ip4s;
 4053                                 mtx_unlock(&cpr->pr_mtx);
 4054                                 ip4 = realloc(ip4, ip4s *
 4055                                     sizeof(struct in_addr), M_TEMP, M_WAITOK);
 4056                                 goto again;
 4057                         }
 4058                         bcopy(cpr->pr_ip4, ip4,
 4059                             cpr->pr_ip4s * sizeof(struct in_addr));
 4060                 }
 4061 #endif
 4062 #ifdef INET6
 4063                 if (cpr->pr_ip6s > 0) {
 4064                         if (ip6s < cpr->pr_ip6s) {
 4065                                 ip6s = cpr->pr_ip6s;
 4066                                 mtx_unlock(&cpr->pr_mtx);
 4067                                 ip6 = realloc(ip6, ip6s *
 4068                                     sizeof(struct in6_addr), M_TEMP, M_WAITOK);
 4069                                 goto again;
 4070                         }
 4071                         bcopy(cpr->pr_ip6, ip6,
 4072                             cpr->pr_ip6s * sizeof(struct in6_addr));
 4073                 }
 4074 #endif
 4075                 if (cpr->pr_ref == 0) {
 4076                         mtx_unlock(&cpr->pr_mtx);
 4077                         continue;
 4078                 }
 4079                 bzero(xp, sizeof(*xp));
 4080                 xp->pr_version = XPRISON_VERSION;
 4081                 xp->pr_id = cpr->pr_id;
 4082                 xp->pr_state = cpr->pr_uref > 0
 4083                     ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
 4084                 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
 4085                 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
 4086                 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
 4087 #ifdef INET
 4088                 xp->pr_ip4s = cpr->pr_ip4s;
 4089 #endif
 4090 #ifdef INET6
 4091                 xp->pr_ip6s = cpr->pr_ip6s;
 4092 #endif
 4093                 mtx_unlock(&cpr->pr_mtx);
 4094                 error = SYSCTL_OUT(req, xp, sizeof(*xp));
 4095                 if (error)
 4096                         break;
 4097 #ifdef INET
 4098                 if (xp->pr_ip4s > 0) {
 4099                         error = SYSCTL_OUT(req, ip4,
 4100                             xp->pr_ip4s * sizeof(struct in_addr));
 4101                         if (error)
 4102                                 break;
 4103                 }
 4104 #endif
 4105 #ifdef INET6
 4106                 if (xp->pr_ip6s > 0) {
 4107                         error = SYSCTL_OUT(req, ip6,
 4108                             xp->pr_ip6s * sizeof(struct in6_addr));
 4109                         if (error)
 4110                                 break;
 4111                 }
 4112 #endif
 4113         }
 4114         sx_sunlock(&allprison_lock);
 4115         free(xp, M_TEMP);
 4116 #ifdef INET
 4117         free(ip4, M_TEMP);
 4118 #endif
 4119 #ifdef INET6
 4120         free(ip6, M_TEMP);
 4121 #endif
 4122         return (error);
 4123 }
 4124 
 4125 SYSCTL_OID(_security_jail, OID_AUTO, list,
 4126     CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4127     sysctl_jail_list, "S", "List of active jails");
 4128 
 4129 static int
 4130 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
 4131 {
 4132         int error, injail;
 4133 
 4134         injail = jailed(req->td->td_ucred);
 4135         error = SYSCTL_OUT(req, &injail, sizeof(injail));
 4136 
 4137         return (error);
 4138 }
 4139 
 4140 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
 4141     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4142     sysctl_jail_jailed, "I", "Process in jail?");
 4143 
 4144 static int
 4145 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
 4146 {
 4147         int error, havevnet;
 4148 #ifdef VIMAGE
 4149         struct ucred *cred = req->td->td_ucred;
 4150 
 4151         havevnet = jailed(cred) && prison_owns_vnet(cred);
 4152 #else
 4153         havevnet = 0;
 4154 #endif
 4155         error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
 4156 
 4157         return (error);
 4158 }
 4159 
 4160 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
 4161     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4162     sysctl_jail_vnet, "I", "Jail owns VNET?");
 4163 
 4164 #if defined(INET) || defined(INET6)
 4165 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
 4166     &jail_max_af_ips, 0,
 4167     "Number of IP addresses a jail may have at most per address family");
 4168 #endif
 4169 
 4170 /*
 4171  * Default parameters for jail(2) compatability.  For historical reasons,
 4172  * the sysctl names have varying similarity to the parameter names.  Prisons
 4173  * just see their own parameters, and can't change them.
 4174  */
 4175 static int
 4176 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
 4177 {
 4178         struct prison *pr;
 4179         int allow, error, i;
 4180 
 4181         pr = req->td->td_ucred->cr_prison;
 4182         allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
 4183 
 4184         /* Get the current flag value, and convert it to a boolean. */
 4185         i = (allow & arg2) ? 1 : 0;
 4186         if (arg1 != NULL)
 4187                 i = !i;
 4188         error = sysctl_handle_int(oidp, &i, 0, req);
 4189         if (error || !req->newptr)
 4190                 return (error);
 4191         i = i ? arg2 : 0;
 4192         if (arg1 != NULL)
 4193                 i ^= arg2;
 4194         /*
 4195          * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
 4196          * for writing.
 4197          */
 4198         mtx_lock(&prison0.pr_mtx);
 4199         jail_default_allow = (jail_default_allow & ~arg2) | i;
 4200         mtx_unlock(&prison0.pr_mtx);
 4201         return (0);
 4202 }
 4203 
 4204 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
 4205     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4206     NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
 4207     "Processes in jail can set their hostnames");
 4208 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
 4209     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4210     (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
 4211     "Processes in jail are limited to creating UNIX/IP/route sockets only");
 4212 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
 4213     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4214     NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
 4215     "Processes in jail can use System V IPC primitives");
 4216 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
 4217     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4218     NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
 4219     "Prison root can create raw sockets");
 4220 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
 4221     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4222     NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
 4223     "Processes in jail can alter system file flags");
 4224 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
 4225     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4226     NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
 4227     "Processes in jail can mount/unmount jail-friendly file systems");
 4228 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
 4229     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4230     NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
 4231     "Processes in jail can mount the devfs file system");
 4232 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
 4233     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4234     NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
 4235     "Processes in jail can mount the nullfs file system");
 4236 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
 4237     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4238     NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
 4239     "Processes in jail can mount the procfs file system");
 4240 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
 4241     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4242     NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
 4243     "Processes in jail can mount the tmpfs file system");
 4244 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
 4245     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4246     NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
 4247     "Processes in jail can mount the zfs file system");
 4248 
 4249 static int
 4250 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
 4251 {
 4252         struct prison *pr;
 4253         int level, error;
 4254 
 4255         pr = req->td->td_ucred->cr_prison;
 4256         level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
 4257         error = sysctl_handle_int(oidp, &level, 0, req);
 4258         if (error || !req->newptr)
 4259                 return (error);
 4260         *(int *)arg1 = level;
 4261         return (0);
 4262 }
 4263 
 4264 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
 4265     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4266     &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
 4267     sysctl_jail_default_level, "I",
 4268     "Processes in jail cannot see all mounted file systems");
 4269 
 4270 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
 4271     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
 4272     &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
 4273     sysctl_jail_default_level, "I",
 4274     "Ruleset for the devfs filesystem in jail");
 4275 
 4276 /*
 4277  * Nodes to describe jail parameters.  Maximum length of string parameters
 4278  * is returned in the string itself, and the other parameters exist merely
 4279  * to make themselves and their types known.
 4280  */
 4281 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
 4282     "Jail parameters");
 4283 
 4284 int
 4285 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
 4286 {
 4287         int i;
 4288         long l;
 4289         size_t s;
 4290         char numbuf[12];
 4291 
 4292         switch (oidp->oid_kind & CTLTYPE)
 4293         {
 4294         case CTLTYPE_LONG:
 4295         case CTLTYPE_ULONG:
 4296                 l = 0;
 4297 #ifdef SCTL_MASK32
 4298                 if (!(req->flags & SCTL_MASK32))
 4299 #endif
 4300                         return (SYSCTL_OUT(req, &l, sizeof(l)));
 4301         case CTLTYPE_INT:
 4302         case CTLTYPE_UINT:
 4303                 i = 0;
 4304                 return (SYSCTL_OUT(req, &i, sizeof(i)));
 4305         case CTLTYPE_STRING:
 4306                 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
 4307                 return
 4308                     (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
 4309         case CTLTYPE_STRUCT:
 4310                 s = (size_t)arg2;
 4311                 return (SYSCTL_OUT(req, &s, sizeof(s)));
 4312         }
 4313         return (0);
 4314 }
 4315 
 4316 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
 4317 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
 4318 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
 4319 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
 4320 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
 4321     "I", "Jail secure level");
 4322 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
 4323     "I", "Jail cannot see all mounted file systems");
 4324 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
 4325     "I", "Ruleset for in-jail devfs mounts");
 4326 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
 4327     "B", "Jail persistence");
 4328 #ifdef VIMAGE
 4329 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
 4330     "E,jailsys", "Virtual network stack");
 4331 #endif
 4332 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
 4333     "B", "Jail is in the process of shutting down");
 4334 
 4335 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
 4336 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
 4337     "I", "Current number of child jails");
 4338 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
 4339     "I", "Maximum number of child jails");
 4340 
 4341 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
 4342 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4343     "Jail hostname");
 4344 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4345     "Jail NIS domainname");
 4346 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
 4347     "Jail host UUID");
 4348 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
 4349     "LU", "Jail host ID");
 4350 
 4351 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
 4352 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
 4353 
 4354 #ifdef INET
 4355 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
 4356     "Jail IPv4 address virtualization");
 4357 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
 4358     "S,in_addr,a", "Jail IPv4 addresses");
 4359 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4360     "B", "Do (not) use IPv4 source address selection rather than the "
 4361     "primary jail IPv4 address.");
 4362 #endif
 4363 #ifdef INET6
 4364 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
 4365     "Jail IPv6 address virtualization");
 4366 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
 4367     "S,in6_addr,a", "Jail IPv6 addresses");
 4368 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4369     "B", "Do (not) use IPv6 source address selection rather than the "
 4370     "primary jail IPv6 address.");
 4371 #endif
 4372 
 4373 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
 4374 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
 4375     "B", "Jail may set hostname");
 4376 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
 4377     "B", "Jail may use SYSV IPC");
 4378 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
 4379     "B", "Jail may create raw sockets");
 4380 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
 4381     "B", "Jail may alter system file flags");
 4382 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
 4383     "B", "Jail may set file quotas");
 4384 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
 4385     "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
 4386 
 4387 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
 4388 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
 4389     "B", "Jail may mount/unmount jail-friendly file systems in general");
 4390 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
 4391     "B", "Jail may mount the devfs file system");
 4392 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
 4393     "B", "Jail may mount the nullfs file system");
 4394 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
 4395     "B", "Jail may mount the procfs file system");
 4396 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
 4397     "B", "Jail may mount the tmpfs file system");
 4398 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
 4399     "B", "Jail may mount the zfs file system");
 4400 
 4401 void
 4402 prison_racct_foreach(void (*callback)(struct racct *racct,
 4403     void *arg2, void *arg3), void *arg2, void *arg3)
 4404 {
 4405         struct prison_racct *prr;
 4406 
 4407         sx_slock(&allprison_lock);
 4408         LIST_FOREACH(prr, &allprison_racct, prr_next)
 4409                 (callback)(prr->prr_racct, arg2, arg3);
 4410         sx_sunlock(&allprison_lock);
 4411 }
 4412 
 4413 static struct prison_racct *
 4414 prison_racct_find_locked(const char *name)
 4415 {
 4416         struct prison_racct *prr;
 4417 
 4418         sx_assert(&allprison_lock, SA_XLOCKED);
 4419 
 4420         if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
 4421                 return (NULL);
 4422 
 4423         LIST_FOREACH(prr, &allprison_racct, prr_next) {
 4424                 if (strcmp(name, prr->prr_name) != 0)
 4425                         continue;
 4426 
 4427                 /* Found prison_racct with a matching name? */
 4428                 prison_racct_hold(prr);
 4429                 return (prr);
 4430         }
 4431 
 4432         /* Add new prison_racct. */
 4433         prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
 4434         racct_create(&prr->prr_racct);
 4435 
 4436         strcpy(prr->prr_name, name);
 4437         refcount_init(&prr->prr_refcount, 1);
 4438         LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
 4439 
 4440         return (prr);
 4441 }
 4442 
 4443 struct prison_racct *
 4444 prison_racct_find(const char *name)
 4445 {
 4446         struct prison_racct *prr;
 4447 
 4448         sx_xlock(&allprison_lock);
 4449         prr = prison_racct_find_locked(name);
 4450         sx_xunlock(&allprison_lock);
 4451         return (prr);
 4452 }
 4453 
 4454 void
 4455 prison_racct_hold(struct prison_racct *prr)
 4456 {
 4457 
 4458         refcount_acquire(&prr->prr_refcount);
 4459 }
 4460 
 4461 static void
 4462 prison_racct_free_locked(struct prison_racct *prr)
 4463 {
 4464 
 4465         sx_assert(&allprison_lock, SA_XLOCKED);
 4466 
 4467         if (refcount_release(&prr->prr_refcount)) {
 4468                 racct_destroy(&prr->prr_racct);
 4469                 LIST_REMOVE(prr, prr_next);
 4470                 free(prr, M_PRISON_RACCT);
 4471         }
 4472 }
 4473 
 4474 void
 4475 prison_racct_free(struct prison_racct *prr)
 4476 {
 4477         int old;
 4478 
 4479         sx_assert(&allprison_lock, SA_UNLOCKED);
 4480 
 4481         old = prr->prr_refcount;
 4482         if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
 4483                 return;
 4484 
 4485         sx_xlock(&allprison_lock);
 4486         prison_racct_free_locked(prr);
 4487         sx_xunlock(&allprison_lock);
 4488 }
 4489 
 4490 #ifdef RACCT
 4491 static void
 4492 prison_racct_attach(struct prison *pr)
 4493 {
 4494         struct prison_racct *prr;
 4495 
 4496         sx_assert(&allprison_lock, SA_XLOCKED);
 4497 
 4498         prr = prison_racct_find_locked(pr->pr_name);
 4499         KASSERT(prr != NULL, ("cannot find prison_racct"));
 4500 
 4501         pr->pr_prison_racct = prr;
 4502 }
 4503 
 4504 /*
 4505  * Handle jail renaming.  From the racct point of view, renaming means
 4506  * moving from one prison_racct to another.
 4507  */
 4508 static void
 4509 prison_racct_modify(struct prison *pr)
 4510 {
 4511         struct proc *p;
 4512         struct ucred *cred;
 4513         struct prison_racct *oldprr;
 4514 
 4515         sx_slock(&allproc_lock);
 4516         sx_xlock(&allprison_lock);
 4517 
 4518         if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
 4519                 sx_xunlock(&allprison_lock);
 4520                 sx_sunlock(&allproc_lock);
 4521                 return;
 4522         }
 4523 
 4524         oldprr = pr->pr_prison_racct;
 4525         pr->pr_prison_racct = NULL;
 4526 
 4527         prison_racct_attach(pr);
 4528 
 4529         /*
 4530          * Move resource utilisation records.
 4531          */
 4532         racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
 4533 
 4534         /*
 4535          * Force rctl to reattach rules to processes.
 4536          */
 4537         FOREACH_PROC_IN_SYSTEM(p) {
 4538                 PROC_LOCK(p);
 4539                 cred = crhold(p->p_ucred);
 4540                 PROC_UNLOCK(p);
 4541                 racct_proc_ucred_changed(p, cred, cred);
 4542                 crfree(cred);
 4543         }
 4544 
 4545         sx_sunlock(&allproc_lock);
 4546         prison_racct_free_locked(oldprr);
 4547         sx_xunlock(&allprison_lock);
 4548 }
 4549 
 4550 static void
 4551 prison_racct_detach(struct prison *pr)
 4552 {
 4553 
 4554         sx_assert(&allprison_lock, SA_UNLOCKED);
 4555 
 4556         if (pr->pr_prison_racct == NULL)
 4557                 return;
 4558         prison_racct_free(pr->pr_prison_racct);
 4559         pr->pr_prison_racct = NULL;
 4560 }
 4561 #endif /* RACCT */
 4562 
 4563 #ifdef DDB
 4564 
 4565 static void
 4566 db_show_prison(struct prison *pr)
 4567 {
 4568         int fi;
 4569 #if defined(INET) || defined(INET6)
 4570         int ii;
 4571 #endif
 4572         unsigned jsf;
 4573 #ifdef INET6
 4574         char ip6buf[INET6_ADDRSTRLEN];
 4575 #endif
 4576 
 4577         db_printf("prison %p:\n", pr);
 4578         db_printf(" jid             = %d\n", pr->pr_id);
 4579         db_printf(" name            = %s\n", pr->pr_name);
 4580         db_printf(" parent          = %p\n", pr->pr_parent);
 4581         db_printf(" ref             = %d\n", pr->pr_ref);
 4582         db_printf(" uref            = %d\n", pr->pr_uref);
 4583         db_printf(" path            = %s\n", pr->pr_path);
 4584         db_printf(" cpuset          = %d\n", pr->pr_cpuset
 4585             ? pr->pr_cpuset->cs_id : -1);
 4586 #ifdef VIMAGE
 4587         db_printf(" vnet            = %p\n", pr->pr_vnet);
 4588 #endif
 4589         db_printf(" root            = %p\n", pr->pr_root);
 4590         db_printf(" securelevel     = %d\n", pr->pr_securelevel);
 4591         db_printf(" devfs_rsnum     = %d\n", pr->pr_devfs_rsnum);
 4592         db_printf(" children.max    = %d\n", pr->pr_childmax);
 4593         db_printf(" children.cur    = %d\n", pr->pr_childcount);
 4594         db_printf(" child           = %p\n", LIST_FIRST(&pr->pr_children));
 4595         db_printf(" sibling         = %p\n", LIST_NEXT(pr, pr_sibling));
 4596         db_printf(" flags           = 0x%x", pr->pr_flags);
 4597         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 4598             fi++)
 4599                 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
 4600                         db_printf(" %s", pr_flag_names[fi]);
 4601         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 4602             fi++) {
 4603                 jsf = pr->pr_flags &
 4604                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 4605                 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
 4606                     pr_flag_jailsys[fi].disable && 
 4607                       (jsf == pr_flag_jailsys[fi].disable) ? "disable"
 4608                     : (jsf == pr_flag_jailsys[fi].new) ? "new"
 4609                     : "inherit");
 4610         }
 4611         db_printf(" allow           = 0x%x", pr->pr_allow);
 4612         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 4613             fi++)
 4614                 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
 4615                         db_printf(" %s", pr_allow_names[fi]);
 4616         db_printf("\n");
 4617         db_printf(" enforce_statfs  = %d\n", pr->pr_enforce_statfs);
 4618         db_printf(" host.hostname   = %s\n", pr->pr_hostname);
 4619         db_printf(" host.domainname = %s\n", pr->pr_domainname);
 4620         db_printf(" host.hostuuid   = %s\n", pr->pr_hostuuid);
 4621         db_printf(" host.hostid     = %lu\n", pr->pr_hostid);
 4622 #ifdef INET
 4623         db_printf(" ip4s            = %d\n", pr->pr_ip4s);
 4624         for (ii = 0; ii < pr->pr_ip4s; ii++)
 4625                 db_printf(" %s %s\n",
 4626                     ii == 0 ? "ip4.addr        =" : "                 ",
 4627                     inet_ntoa(pr->pr_ip4[ii]));
 4628 #endif
 4629 #ifdef INET6
 4630         db_printf(" ip6s            = %d\n", pr->pr_ip6s);
 4631         for (ii = 0; ii < pr->pr_ip6s; ii++)
 4632                 db_printf(" %s %s\n",
 4633                     ii == 0 ? "ip6.addr        =" : "                 ",
 4634                     ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
 4635 #endif
 4636 }
 4637 
 4638 DB_SHOW_COMMAND(prison, db_show_prison_command)
 4639 {
 4640         struct prison *pr;
 4641 
 4642         if (!have_addr) {
 4643                 /*
 4644                  * Show all prisons in the list, and prison0 which is not
 4645                  * listed.
 4646                  */
 4647                 db_show_prison(&prison0);
 4648                 if (!db_pager_quit) {
 4649                         TAILQ_FOREACH(pr, &allprison, pr_list) {
 4650                                 db_show_prison(pr);
 4651                                 if (db_pager_quit)
 4652                                         break;
 4653                         }
 4654                 }
 4655                 return;
 4656         }
 4657 
 4658         if (addr == 0)
 4659                 pr = &prison0;
 4660         else {
 4661                 /* Look for a prison with the ID and with references. */
 4662                 TAILQ_FOREACH(pr, &allprison, pr_list)
 4663                         if (pr->pr_id == addr && pr->pr_ref > 0)
 4664                                 break;
 4665                 if (pr == NULL)
 4666                         /* Look again, without requiring a reference. */
 4667                         TAILQ_FOREACH(pr, &allprison, pr_list)
 4668                                 if (pr->pr_id == addr)
 4669                                         break;
 4670                 if (pr == NULL)
 4671                         /* Assume address points to a valid prison. */
 4672                         pr = (struct prison *)addr;
 4673         }
 4674         db_show_prison(pr);
 4675 }
 4676 
 4677 #endif /* DDB */

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