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/10.1/sys/kern/kern_jail.c 271622 2014-09-15 13:01:47Z trasz $");
   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                 if (!(flags & JAIL_ATTACH))
 1815                         sx_sunlock(&allprison_lock);
 1816                 prison_racct_modify(pr);
 1817                 if (!(flags & JAIL_ATTACH))
 1818                         sx_slock(&allprison_lock);
 1819         }
 1820 #endif
 1821 
 1822         td->td_retval[0] = pr->pr_id;
 1823 
 1824         /*
 1825          * Now that it is all there, drop the temporary reference from existing
 1826          * prisons.  Or add a reference to newly created persistent prisons
 1827          * (which was not done earlier so that the prison would not be publicly
 1828          * visible).
 1829          */
 1830         if (!created) {
 1831                 prison_deref(pr, (flags & JAIL_ATTACH)
 1832                     ? PD_DEREF
 1833                     : PD_DEREF | PD_LIST_SLOCKED);
 1834         } else {
 1835                 if (pr_flags & PR_PERSIST) {
 1836                         mtx_lock(&pr->pr_mtx);
 1837                         pr->pr_ref++;
 1838                         pr->pr_uref++;
 1839                         mtx_unlock(&pr->pr_mtx);
 1840                 }
 1841                 if (!(flags & JAIL_ATTACH))
 1842                         sx_sunlock(&allprison_lock);
 1843         }
 1844 
 1845         goto done_errmsg;
 1846 
 1847  done_deref_locked:
 1848         prison_deref(pr, created
 1849             ? PD_LOCKED | PD_LIST_XLOCKED
 1850             : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 1851         goto done_releroot;
 1852  done_unlock_list:
 1853         sx_xunlock(&allprison_lock);
 1854  done_releroot:
 1855         if (root != NULL)
 1856                 vrele(root);
 1857  done_errmsg:
 1858         if (error) {
 1859                 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
 1860                 if (errmsg_len > 0) {
 1861                         errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
 1862                         if (errmsg_pos > 0) {
 1863                                 if (optuio->uio_segflg == UIO_SYSSPACE)
 1864                                         bcopy(errmsg,
 1865                                            optuio->uio_iov[errmsg_pos].iov_base,
 1866                                            errmsg_len);
 1867                                 else
 1868                                         copyout(errmsg,
 1869                                            optuio->uio_iov[errmsg_pos].iov_base,
 1870                                            errmsg_len);
 1871                         }
 1872                 }
 1873         }
 1874  done_free:
 1875 #ifdef INET
 1876         free(ip4, M_PRISON);
 1877 #endif
 1878 #ifdef INET6
 1879         free(ip6, M_PRISON);
 1880 #endif
 1881         if (g_path != NULL)
 1882                 free(g_path, M_TEMP);
 1883         vfs_freeopts(opts);
 1884         return (error);
 1885 }
 1886 
 1887 
 1888 /*
 1889  * struct jail_get_args {
 1890  *      struct iovec *iovp;
 1891  *      unsigned int iovcnt;
 1892  *      int flags;
 1893  * };
 1894  */
 1895 int
 1896 sys_jail_get(struct thread *td, struct jail_get_args *uap)
 1897 {
 1898         struct uio *auio;
 1899         int error;
 1900 
 1901         /* Check that we have an even number of iovecs. */
 1902         if (uap->iovcnt & 1)
 1903                 return (EINVAL);
 1904 
 1905         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
 1906         if (error)
 1907                 return (error);
 1908         error = kern_jail_get(td, auio, uap->flags);
 1909         if (error == 0)
 1910                 error = copyout(auio->uio_iov, uap->iovp,
 1911                     uap->iovcnt * sizeof (struct iovec));
 1912         free(auio, M_IOV);
 1913         return (error);
 1914 }
 1915 
 1916 int
 1917 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
 1918 {
 1919         struct prison *pr, *mypr;
 1920         struct vfsopt *opt;
 1921         struct vfsoptlist *opts;
 1922         char *errmsg, *name;
 1923         int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
 1924 
 1925         if (flags & ~JAIL_GET_MASK)
 1926                 return (EINVAL);
 1927 
 1928         /* Get the parameter list. */
 1929         error = vfs_buildopts(optuio, &opts);
 1930         if (error)
 1931                 return (error);
 1932         errmsg_pos = vfs_getopt_pos(opts, "errmsg");
 1933         mypr = td->td_ucred->cr_prison;
 1934 
 1935         /*
 1936          * Find the prison specified by one of: lastjid, jid, name.
 1937          */
 1938         sx_slock(&allprison_lock);
 1939         error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
 1940         if (error == 0) {
 1941                 TAILQ_FOREACH(pr, &allprison, pr_list) {
 1942                         if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
 1943                                 mtx_lock(&pr->pr_mtx);
 1944                                 if (pr->pr_ref > 0 &&
 1945                                     (pr->pr_uref > 0 || (flags & JAIL_DYING)))
 1946                                         break;
 1947                                 mtx_unlock(&pr->pr_mtx);
 1948                         }
 1949                 }
 1950                 if (pr != NULL)
 1951                         goto found_prison;
 1952                 error = ENOENT;
 1953                 vfs_opterror(opts, "no jail after %d", jid);
 1954                 goto done_unlock_list;
 1955         } else if (error != ENOENT)
 1956                 goto done_unlock_list;
 1957 
 1958         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
 1959         if (error == 0) {
 1960                 if (jid != 0) {
 1961                         pr = prison_find_child(mypr, jid);
 1962                         if (pr != NULL) {
 1963                                 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 1964                                         mtx_unlock(&pr->pr_mtx);
 1965                                         error = ENOENT;
 1966                                         vfs_opterror(opts, "jail %d is dying",
 1967                                             jid);
 1968                                         goto done_unlock_list;
 1969                                 }
 1970                                 goto found_prison;
 1971                         }
 1972                         error = ENOENT;
 1973                         vfs_opterror(opts, "jail %d not found", jid);
 1974                         goto done_unlock_list;
 1975                 }
 1976         } else if (error != ENOENT)
 1977                 goto done_unlock_list;
 1978 
 1979         error = vfs_getopt(opts, "name", (void **)&name, &len);
 1980         if (error == 0) {
 1981                 if (len == 0 || name[len - 1] != '\0') {
 1982                         error = EINVAL;
 1983                         goto done_unlock_list;
 1984                 }
 1985                 pr = prison_find_name(mypr, name);
 1986                 if (pr != NULL) {
 1987                         if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 1988                                 mtx_unlock(&pr->pr_mtx);
 1989                                 error = ENOENT;
 1990                                 vfs_opterror(opts, "jail \"%s\" is dying",
 1991                                     name);
 1992                                 goto done_unlock_list;
 1993                         }
 1994                         goto found_prison;
 1995                 }
 1996                 error = ENOENT;
 1997                 vfs_opterror(opts, "jail \"%s\" not found", name);
 1998                 goto done_unlock_list;
 1999         } else if (error != ENOENT)
 2000                 goto done_unlock_list;
 2001 
 2002         vfs_opterror(opts, "no jail specified");
 2003         error = ENOENT;
 2004         goto done_unlock_list;
 2005 
 2006  found_prison:
 2007         /* Get the parameters of the prison. */
 2008         pr->pr_ref++;
 2009         locked = PD_LOCKED;
 2010         td->td_retval[0] = pr->pr_id;
 2011         error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
 2012         if (error != 0 && error != ENOENT)
 2013                 goto done_deref;
 2014         i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
 2015         error = vfs_setopt(opts, "parent", &i, sizeof(i));
 2016         if (error != 0 && error != ENOENT)
 2017                 goto done_deref;
 2018         error = vfs_setopts(opts, "name", prison_name(mypr, pr));
 2019         if (error != 0 && error != ENOENT)
 2020                 goto done_deref;
 2021         error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
 2022             sizeof(pr->pr_cpuset->cs_id));
 2023         if (error != 0 && error != ENOENT)
 2024                 goto done_deref;
 2025         error = vfs_setopts(opts, "path", prison_path(mypr, pr));
 2026         if (error != 0 && error != ENOENT)
 2027                 goto done_deref;
 2028 #ifdef INET
 2029         error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
 2030             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2031         if (error != 0 && error != ENOENT)
 2032                 goto done_deref;
 2033 #endif
 2034 #ifdef INET6
 2035         error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
 2036             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 2037         if (error != 0 && error != ENOENT)
 2038                 goto done_deref;
 2039 #endif
 2040         error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
 2041             sizeof(pr->pr_securelevel));
 2042         if (error != 0 && error != ENOENT)
 2043                 goto done_deref;
 2044         error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
 2045             sizeof(pr->pr_childcount));
 2046         if (error != 0 && error != ENOENT)
 2047                 goto done_deref;
 2048         error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
 2049             sizeof(pr->pr_childmax));
 2050         if (error != 0 && error != ENOENT)
 2051                 goto done_deref;
 2052         error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
 2053         if (error != 0 && error != ENOENT)
 2054                 goto done_deref;
 2055         error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
 2056         if (error != 0 && error != ENOENT)
 2057                 goto done_deref;
 2058         error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
 2059         if (error != 0 && error != ENOENT)
 2060                 goto done_deref;
 2061 #ifdef COMPAT_FREEBSD32
 2062         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
 2063                 uint32_t hid32 = pr->pr_hostid;
 2064 
 2065                 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
 2066         } else
 2067 #endif
 2068         error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
 2069             sizeof(pr->pr_hostid));
 2070         if (error != 0 && error != ENOENT)
 2071                 goto done_deref;
 2072         error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
 2073             sizeof(pr->pr_enforce_statfs));
 2074         if (error != 0 && error != ENOENT)
 2075                 goto done_deref;
 2076         error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
 2077             sizeof(pr->pr_devfs_rsnum));
 2078         if (error != 0 && error != ENOENT)
 2079                 goto done_deref;
 2080         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 2081             fi++) {
 2082                 if (pr_flag_names[fi] == NULL)
 2083                         continue;
 2084                 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
 2085                 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
 2086                 if (error != 0 && error != ENOENT)
 2087                         goto done_deref;
 2088                 i = !i;
 2089                 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
 2090                 if (error != 0 && error != ENOENT)
 2091                         goto done_deref;
 2092         }
 2093         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 2094             fi++) {
 2095                 i = pr->pr_flags &
 2096                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 2097                 i = pr_flag_jailsys[fi].disable &&
 2098                       (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
 2099                     : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
 2100                     : JAIL_SYS_INHERIT;
 2101                 error =
 2102                     vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
 2103                 if (error != 0 && error != ENOENT)
 2104                         goto done_deref;
 2105         }
 2106         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 2107             fi++) {
 2108                 if (pr_allow_names[fi] == NULL)
 2109                         continue;
 2110                 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
 2111                 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
 2112                 if (error != 0 && error != ENOENT)
 2113                         goto done_deref;
 2114                 i = !i;
 2115                 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
 2116                 if (error != 0 && error != ENOENT)
 2117                         goto done_deref;
 2118         }
 2119         i = (pr->pr_uref == 0);
 2120         error = vfs_setopt(opts, "dying", &i, sizeof(i));
 2121         if (error != 0 && error != ENOENT)
 2122                 goto done_deref;
 2123         i = !i;
 2124         error = vfs_setopt(opts, "nodying", &i, sizeof(i));
 2125         if (error != 0 && error != ENOENT)
 2126                 goto done_deref;
 2127 
 2128         /* Get the module parameters. */
 2129         mtx_unlock(&pr->pr_mtx);
 2130         locked = 0;
 2131         error = osd_jail_call(pr, PR_METHOD_GET, opts);
 2132         if (error)
 2133                 goto done_deref;
 2134         prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
 2135 
 2136         /* By now, all parameters should have been noted. */
 2137         TAILQ_FOREACH(opt, opts, link) {
 2138                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
 2139                         error = EINVAL;
 2140                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
 2141                         goto done_errmsg;
 2142                 }
 2143         }
 2144 
 2145         /* Write the fetched parameters back to userspace. */
 2146         error = 0;
 2147         TAILQ_FOREACH(opt, opts, link) {
 2148                 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
 2149                         pos = 2 * opt->pos + 1;
 2150                         optuio->uio_iov[pos].iov_len = opt->len;
 2151                         if (opt->value != NULL) {
 2152                                 if (optuio->uio_segflg == UIO_SYSSPACE) {
 2153                                         bcopy(opt->value,
 2154                                             optuio->uio_iov[pos].iov_base,
 2155                                             opt->len);
 2156                                 } else {
 2157                                         error = copyout(opt->value,
 2158                                             optuio->uio_iov[pos].iov_base,
 2159                                             opt->len);
 2160                                         if (error)
 2161                                                 break;
 2162                                 }
 2163                         }
 2164                 }
 2165         }
 2166         goto done_errmsg;
 2167 
 2168  done_deref:
 2169         prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
 2170         goto done_errmsg;
 2171 
 2172  done_unlock_list:
 2173         sx_sunlock(&allprison_lock);
 2174  done_errmsg:
 2175         if (error && errmsg_pos >= 0) {
 2176                 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
 2177                 errmsg_pos = 2 * errmsg_pos + 1;
 2178                 if (errmsg_len > 0) {
 2179                         if (optuio->uio_segflg == UIO_SYSSPACE)
 2180                                 bcopy(errmsg,
 2181                                     optuio->uio_iov[errmsg_pos].iov_base,
 2182                                     errmsg_len);
 2183                         else
 2184                                 copyout(errmsg,
 2185                                     optuio->uio_iov[errmsg_pos].iov_base,
 2186                                     errmsg_len);
 2187                 }
 2188         }
 2189         vfs_freeopts(opts);
 2190         return (error);
 2191 }
 2192 
 2193 
 2194 /*
 2195  * struct jail_remove_args {
 2196  *      int jid;
 2197  * };
 2198  */
 2199 int
 2200 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
 2201 {
 2202         struct prison *pr, *cpr, *lpr, *tpr;
 2203         int descend, error;
 2204 
 2205         error = priv_check(td, PRIV_JAIL_REMOVE);
 2206         if (error)
 2207                 return (error);
 2208 
 2209         sx_xlock(&allprison_lock);
 2210         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2211         if (pr == NULL) {
 2212                 sx_xunlock(&allprison_lock);
 2213                 return (EINVAL);
 2214         }
 2215 
 2216         /* Remove all descendants of this prison, then remove this prison. */
 2217         pr->pr_ref++;
 2218         pr->pr_flags |= PR_REMOVE;
 2219         if (!LIST_EMPTY(&pr->pr_children)) {
 2220                 mtx_unlock(&pr->pr_mtx);
 2221                 lpr = NULL;
 2222                 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 2223                         mtx_lock(&cpr->pr_mtx);
 2224                         if (cpr->pr_ref > 0) {
 2225                                 tpr = cpr;
 2226                                 cpr->pr_ref++;
 2227                                 cpr->pr_flags |= PR_REMOVE;
 2228                         } else {
 2229                                 /* Already removed - do not do it again. */
 2230                                 tpr = NULL;
 2231                         }
 2232                         mtx_unlock(&cpr->pr_mtx);
 2233                         if (lpr != NULL) {
 2234                                 mtx_lock(&lpr->pr_mtx);
 2235                                 prison_remove_one(lpr);
 2236                                 sx_xlock(&allprison_lock);
 2237                         }
 2238                         lpr = tpr;
 2239                 }
 2240                 if (lpr != NULL) {
 2241                         mtx_lock(&lpr->pr_mtx);
 2242                         prison_remove_one(lpr);
 2243                         sx_xlock(&allprison_lock);
 2244                 }
 2245                 mtx_lock(&pr->pr_mtx);
 2246         }
 2247         prison_remove_one(pr);
 2248         return (0);
 2249 }
 2250 
 2251 static void
 2252 prison_remove_one(struct prison *pr)
 2253 {
 2254         struct proc *p;
 2255         int deuref;
 2256 
 2257         /* If the prison was persistent, it is not anymore. */
 2258         deuref = 0;
 2259         if (pr->pr_flags & PR_PERSIST) {
 2260                 pr->pr_ref--;
 2261                 deuref = PD_DEUREF;
 2262                 pr->pr_flags &= ~PR_PERSIST;
 2263         }
 2264 
 2265         /*
 2266          * jail_remove added a reference.  If that's the only one, remove
 2267          * the prison now.
 2268          */
 2269         KASSERT(pr->pr_ref > 0,
 2270             ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
 2271         if (pr->pr_ref == 1) {
 2272                 prison_deref(pr,
 2273                     deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 2274                 return;
 2275         }
 2276 
 2277         mtx_unlock(&pr->pr_mtx);
 2278         sx_xunlock(&allprison_lock);
 2279         /*
 2280          * Kill all processes unfortunate enough to be attached to this prison.
 2281          */
 2282         sx_slock(&allproc_lock);
 2283         LIST_FOREACH(p, &allproc, p_list) {
 2284                 PROC_LOCK(p);
 2285                 if (p->p_state != PRS_NEW && p->p_ucred &&
 2286                     p->p_ucred->cr_prison == pr)
 2287                         kern_psignal(p, SIGKILL);
 2288                 PROC_UNLOCK(p);
 2289         }
 2290         sx_sunlock(&allproc_lock);
 2291         /* Remove the temporary reference added by jail_remove. */
 2292         prison_deref(pr, deuref | PD_DEREF);
 2293 }
 2294 
 2295 
 2296 /*
 2297  * struct jail_attach_args {
 2298  *      int jid;
 2299  * };
 2300  */
 2301 int
 2302 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
 2303 {
 2304         struct prison *pr;
 2305         int error;
 2306 
 2307         error = priv_check(td, PRIV_JAIL_ATTACH);
 2308         if (error)
 2309                 return (error);
 2310 
 2311         sx_slock(&allprison_lock);
 2312         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2313         if (pr == NULL) {
 2314                 sx_sunlock(&allprison_lock);
 2315                 return (EINVAL);
 2316         }
 2317 
 2318         /*
 2319          * Do not allow a process to attach to a prison that is not
 2320          * considered to be "alive".
 2321          */
 2322         if (pr->pr_uref == 0) {
 2323                 mtx_unlock(&pr->pr_mtx);
 2324                 sx_sunlock(&allprison_lock);
 2325                 return (EINVAL);
 2326         }
 2327 
 2328         return (do_jail_attach(td, pr));
 2329 }
 2330 
 2331 static int
 2332 do_jail_attach(struct thread *td, struct prison *pr)
 2333 {
 2334         struct prison *ppr;
 2335         struct proc *p;
 2336         struct ucred *newcred, *oldcred;
 2337         int error;
 2338 
 2339         /*
 2340          * XXX: Note that there is a slight race here if two threads
 2341          * in the same privileged process attempt to attach to two
 2342          * different jails at the same time.  It is important for
 2343          * user processes not to do this, or they might end up with
 2344          * a process root from one prison, but attached to the jail
 2345          * of another.
 2346          */
 2347         pr->pr_ref++;
 2348         pr->pr_uref++;
 2349         mtx_unlock(&pr->pr_mtx);
 2350 
 2351         /* Let modules do whatever they need to prepare for attaching. */
 2352         error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
 2353         if (error) {
 2354                 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
 2355                 return (error);
 2356         }
 2357         sx_sunlock(&allprison_lock);
 2358 
 2359         /*
 2360          * Reparent the newly attached process to this jail.
 2361          */
 2362         ppr = td->td_ucred->cr_prison;
 2363         p = td->td_proc;
 2364         error = cpuset_setproc_update_set(p, pr->pr_cpuset);
 2365         if (error)
 2366                 goto e_revert_osd;
 2367 
 2368         vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
 2369         if ((error = change_dir(pr->pr_root, td)) != 0)
 2370                 goto e_unlock;
 2371 #ifdef MAC
 2372         if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
 2373                 goto e_unlock;
 2374 #endif
 2375         VOP_UNLOCK(pr->pr_root, 0);
 2376         if ((error = change_root(pr->pr_root, td)))
 2377                 goto e_revert_osd;
 2378 
 2379         newcred = crget();
 2380         PROC_LOCK(p);
 2381         oldcred = p->p_ucred;
 2382         setsugid(p);
 2383         crcopy(newcred, oldcred);
 2384         newcred->cr_prison = pr;
 2385         p->p_ucred = newcred;
 2386         PROC_UNLOCK(p);
 2387 #ifdef RACCT
 2388         racct_proc_ucred_changed(p, oldcred, newcred);
 2389 #endif
 2390         crfree(oldcred);
 2391         prison_deref(ppr, PD_DEREF | PD_DEUREF);
 2392         return (0);
 2393  e_unlock:
 2394         VOP_UNLOCK(pr->pr_root, 0);
 2395  e_revert_osd:
 2396         /* Tell modules this thread is still in its old jail after all. */
 2397         (void)osd_jail_call(ppr, PR_METHOD_ATTACH, td);
 2398         prison_deref(pr, PD_DEREF | PD_DEUREF);
 2399         return (error);
 2400 }
 2401 
 2402 
 2403 /*
 2404  * Returns a locked prison instance, or NULL on failure.
 2405  */
 2406 struct prison *
 2407 prison_find(int prid)
 2408 {
 2409         struct prison *pr;
 2410 
 2411         sx_assert(&allprison_lock, SX_LOCKED);
 2412         TAILQ_FOREACH(pr, &allprison, pr_list) {
 2413                 if (pr->pr_id == prid) {
 2414                         mtx_lock(&pr->pr_mtx);
 2415                         if (pr->pr_ref > 0)
 2416                                 return (pr);
 2417                         mtx_unlock(&pr->pr_mtx);
 2418                 }
 2419         }
 2420         return (NULL);
 2421 }
 2422 
 2423 /*
 2424  * Find a prison that is a descendant of mypr.  Returns a locked prison or NULL.
 2425  */
 2426 struct prison *
 2427 prison_find_child(struct prison *mypr, int prid)
 2428 {
 2429         struct prison *pr;
 2430         int descend;
 2431 
 2432         sx_assert(&allprison_lock, SX_LOCKED);
 2433         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2434                 if (pr->pr_id == prid) {
 2435                         mtx_lock(&pr->pr_mtx);
 2436                         if (pr->pr_ref > 0)
 2437                                 return (pr);
 2438                         mtx_unlock(&pr->pr_mtx);
 2439                 }
 2440         }
 2441         return (NULL);
 2442 }
 2443 
 2444 /*
 2445  * Look for the name relative to mypr.  Returns a locked prison or NULL.
 2446  */
 2447 struct prison *
 2448 prison_find_name(struct prison *mypr, const char *name)
 2449 {
 2450         struct prison *pr, *deadpr;
 2451         size_t mylen;
 2452         int descend;
 2453 
 2454         sx_assert(&allprison_lock, SX_LOCKED);
 2455         mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
 2456  again:
 2457         deadpr = NULL;
 2458         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2459                 if (!strcmp(pr->pr_name + mylen, name)) {
 2460                         mtx_lock(&pr->pr_mtx);
 2461                         if (pr->pr_ref > 0) {
 2462                                 if (pr->pr_uref > 0)
 2463                                         return (pr);
 2464                                 deadpr = pr;
 2465                         }
 2466                         mtx_unlock(&pr->pr_mtx);
 2467                 }
 2468         }
 2469         /* There was no valid prison - perhaps there was a dying one. */
 2470         if (deadpr != NULL) {
 2471                 mtx_lock(&deadpr->pr_mtx);
 2472                 if (deadpr->pr_ref == 0) {
 2473                         mtx_unlock(&deadpr->pr_mtx);
 2474                         goto again;
 2475                 }
 2476         }
 2477         return (deadpr);
 2478 }
 2479 
 2480 /*
 2481  * See if a prison has the specific flag set.
 2482  */
 2483 int
 2484 prison_flag(struct ucred *cred, unsigned flag)
 2485 {
 2486 
 2487         /* This is an atomic read, so no locking is necessary. */
 2488         return (cred->cr_prison->pr_flags & flag);
 2489 }
 2490 
 2491 int
 2492 prison_allow(struct ucred *cred, unsigned flag)
 2493 {
 2494 
 2495         /* This is an atomic read, so no locking is necessary. */
 2496         return (cred->cr_prison->pr_allow & flag);
 2497 }
 2498 
 2499 /*
 2500  * Remove a prison reference.  If that was the last reference, remove the
 2501  * prison itself - but not in this context in case there are locks held.
 2502  */
 2503 void
 2504 prison_free_locked(struct prison *pr)
 2505 {
 2506 
 2507         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2508         pr->pr_ref--;
 2509         if (pr->pr_ref == 0) {
 2510                 mtx_unlock(&pr->pr_mtx);
 2511                 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
 2512                 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
 2513                 return;
 2514         }
 2515         mtx_unlock(&pr->pr_mtx);
 2516 }
 2517 
 2518 void
 2519 prison_free(struct prison *pr)
 2520 {
 2521 
 2522         mtx_lock(&pr->pr_mtx);
 2523         prison_free_locked(pr);
 2524 }
 2525 
 2526 static void
 2527 prison_complete(void *context, int pending)
 2528 {
 2529 
 2530         prison_deref((struct prison *)context, 0);
 2531 }
 2532 
 2533 /*
 2534  * Remove a prison reference (usually).  This internal version assumes no
 2535  * mutexes are held, except perhaps the prison itself.  If there are no more
 2536  * references, release and delist the prison.  On completion, the prison lock
 2537  * and the allprison lock are both unlocked.
 2538  */
 2539 static void
 2540 prison_deref(struct prison *pr, int flags)
 2541 {
 2542         struct prison *ppr, *tpr;
 2543 
 2544         if (!(flags & PD_LOCKED))
 2545                 mtx_lock(&pr->pr_mtx);
 2546         for (;;) {
 2547                 if (flags & PD_DEUREF) {
 2548                         pr->pr_uref--;
 2549                         KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
 2550                 }
 2551                 if (flags & PD_DEREF)
 2552                         pr->pr_ref--;
 2553                 /* If the prison still has references, nothing else to do. */
 2554                 if (pr->pr_ref > 0) {
 2555                         mtx_unlock(&pr->pr_mtx);
 2556                         if (flags & PD_LIST_SLOCKED)
 2557                                 sx_sunlock(&allprison_lock);
 2558                         else if (flags & PD_LIST_XLOCKED)
 2559                                 sx_xunlock(&allprison_lock);
 2560                         return;
 2561                 }
 2562 
 2563                 mtx_unlock(&pr->pr_mtx);
 2564                 if (flags & PD_LIST_SLOCKED) {
 2565                         if (!sx_try_upgrade(&allprison_lock)) {
 2566                                 sx_sunlock(&allprison_lock);
 2567                                 sx_xlock(&allprison_lock);
 2568                         }
 2569                 } else if (!(flags & PD_LIST_XLOCKED))
 2570                         sx_xlock(&allprison_lock);
 2571 
 2572                 TAILQ_REMOVE(&allprison, pr, pr_list);
 2573                 LIST_REMOVE(pr, pr_sibling);
 2574                 ppr = pr->pr_parent;
 2575                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 2576                         tpr->pr_childcount--;
 2577                 sx_xunlock(&allprison_lock);
 2578 
 2579 #ifdef VIMAGE
 2580                 if (pr->pr_vnet != ppr->pr_vnet)
 2581                         vnet_destroy(pr->pr_vnet);
 2582 #endif
 2583                 if (pr->pr_root != NULL)
 2584                         vrele(pr->pr_root);
 2585                 mtx_destroy(&pr->pr_mtx);
 2586 #ifdef INET
 2587                 free(pr->pr_ip4, M_PRISON);
 2588 #endif
 2589 #ifdef INET6
 2590                 free(pr->pr_ip6, M_PRISON);
 2591 #endif
 2592                 if (pr->pr_cpuset != NULL)
 2593                         cpuset_rel(pr->pr_cpuset);
 2594                 osd_jail_exit(pr);
 2595 #ifdef RACCT
 2596                 prison_racct_detach(pr);
 2597 #endif
 2598                 free(pr, M_PRISON);
 2599 
 2600                 /* Removing a prison frees a reference on its parent. */
 2601                 pr = ppr;
 2602                 mtx_lock(&pr->pr_mtx);
 2603                 flags = PD_DEREF | PD_DEUREF;
 2604         }
 2605 }
 2606 
 2607 void
 2608 prison_hold_locked(struct prison *pr)
 2609 {
 2610 
 2611         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2612         KASSERT(pr->pr_ref > 0,
 2613             ("Trying to hold dead prison (jid=%d).", pr->pr_id));
 2614         pr->pr_ref++;
 2615 }
 2616 
 2617 void
 2618 prison_hold(struct prison *pr)
 2619 {
 2620 
 2621         mtx_lock(&pr->pr_mtx);
 2622         prison_hold_locked(pr);
 2623         mtx_unlock(&pr->pr_mtx);
 2624 }
 2625 
 2626 void
 2627 prison_proc_hold(struct prison *pr)
 2628 {
 2629 
 2630         mtx_lock(&pr->pr_mtx);
 2631         KASSERT(pr->pr_uref > 0,
 2632             ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
 2633         pr->pr_uref++;
 2634         mtx_unlock(&pr->pr_mtx);
 2635 }
 2636 
 2637 void
 2638 prison_proc_free(struct prison *pr)
 2639 {
 2640 
 2641         mtx_lock(&pr->pr_mtx);
 2642         KASSERT(pr->pr_uref > 0,
 2643             ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
 2644         prison_deref(pr, PD_DEUREF | PD_LOCKED);
 2645 }
 2646 
 2647 
 2648 #ifdef INET
 2649 /*
 2650  * Restrict a prison's IP address list with its parent's, possibly replacing
 2651  * it.  Return true if the replacement buffer was used (or would have been).
 2652  */
 2653 static int
 2654 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
 2655 {
 2656         int ii, ij, used;
 2657         struct prison *ppr;
 2658 
 2659         ppr = pr->pr_parent;
 2660         if (!(pr->pr_flags & PR_IP4_USER)) {
 2661                 /* This has no user settings, so just copy the parent's list. */
 2662                 if (pr->pr_ip4s < ppr->pr_ip4s) {
 2663                         /*
 2664                          * There's no room for the parent's list.  Use the
 2665                          * new list buffer, which is assumed to be big enough
 2666                          * (if it was passed).  If there's no buffer, try to
 2667                          * allocate one.
 2668                          */
 2669                         used = 1;
 2670                         if (newip4 == NULL) {
 2671                                 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
 2672                                     M_PRISON, M_NOWAIT);
 2673                                 if (newip4 != NULL)
 2674                                         used = 0;
 2675                         }
 2676                         if (newip4 != NULL) {
 2677                                 bcopy(ppr->pr_ip4, newip4,
 2678                                     ppr->pr_ip4s * sizeof(*newip4));
 2679                                 free(pr->pr_ip4, M_PRISON);
 2680                                 pr->pr_ip4 = newip4;
 2681                                 pr->pr_ip4s = ppr->pr_ip4s;
 2682                         }
 2683                         return (used);
 2684                 }
 2685                 pr->pr_ip4s = ppr->pr_ip4s;
 2686                 if (pr->pr_ip4s > 0)
 2687                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 2688                             pr->pr_ip4s * sizeof(*newip4));
 2689                 else if (pr->pr_ip4 != NULL) {
 2690                         free(pr->pr_ip4, M_PRISON);
 2691                         pr->pr_ip4 = NULL;
 2692                 }
 2693         } else if (pr->pr_ip4s > 0) {
 2694                 /* Remove addresses that aren't in the parent. */
 2695                 for (ij = 0; ij < ppr->pr_ip4s; ij++)
 2696                         if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 2697                                 break;
 2698                 if (ij < ppr->pr_ip4s)
 2699                         ii = 1;
 2700                 else {
 2701                         bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
 2702                             --pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2703                         ii = 0;
 2704                 }
 2705                 for (ij = 1; ii < pr->pr_ip4s; ) {
 2706                         if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
 2707                                 ii++;
 2708                                 continue;
 2709                         }
 2710                         switch (ij >= ppr->pr_ip4s ? -1 :
 2711                                 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
 2712                         case -1:
 2713                                 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
 2714                                     (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
 2715                                 break;
 2716                         case 0:
 2717                                 ii++;
 2718                                 ij++;
 2719                                 break;
 2720                         case 1:
 2721                                 ij++;
 2722                                 break;
 2723                         }
 2724                 }
 2725                 if (pr->pr_ip4s == 0) {
 2726                         pr->pr_flags |= PR_IP4_DISABLE;
 2727                         free(pr->pr_ip4, M_PRISON);
 2728                         pr->pr_ip4 = NULL;
 2729                 }
 2730         }
 2731         return (0);
 2732 }
 2733 
 2734 /*
 2735  * Pass back primary IPv4 address of this jail.
 2736  *
 2737  * If not restricted return success but do not alter the address.  Caller has
 2738  * to make sure to initialize it correctly (e.g. INADDR_ANY).
 2739  *
 2740  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 2741  * Address returned in NBO.
 2742  */
 2743 int
 2744 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
 2745 {
 2746         struct prison *pr;
 2747 
 2748         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2749         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2750 
 2751         pr = cred->cr_prison;
 2752         if (!(pr->pr_flags & PR_IP4))
 2753                 return (0);
 2754         mtx_lock(&pr->pr_mtx);
 2755         if (!(pr->pr_flags & PR_IP4)) {
 2756                 mtx_unlock(&pr->pr_mtx);
 2757                 return (0);
 2758         }
 2759         if (pr->pr_ip4 == NULL) {
 2760                 mtx_unlock(&pr->pr_mtx);
 2761                 return (EAFNOSUPPORT);
 2762         }
 2763 
 2764         ia->s_addr = pr->pr_ip4[0].s_addr;
 2765         mtx_unlock(&pr->pr_mtx);
 2766         return (0);
 2767 }
 2768 
 2769 /*
 2770  * Return 1 if we should do proper source address selection or are not jailed.
 2771  * We will return 0 if we should bypass source address selection in favour
 2772  * of the primary jail IPv4 address. Only in this case *ia will be updated and
 2773  * returned in NBO.
 2774  * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
 2775  */
 2776 int
 2777 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
 2778 {
 2779         struct prison *pr;
 2780         struct in_addr lia;
 2781         int error;
 2782 
 2783         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2784         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2785 
 2786         if (!jailed(cred))
 2787                 return (1);
 2788 
 2789         pr = cred->cr_prison;
 2790         if (pr->pr_flags & PR_IP4_SADDRSEL)
 2791                 return (1);
 2792 
 2793         lia.s_addr = INADDR_ANY;
 2794         error = prison_get_ip4(cred, &lia);
 2795         if (error)
 2796                 return (error);
 2797         if (lia.s_addr == INADDR_ANY)
 2798                 return (1);
 2799 
 2800         ia->s_addr = lia.s_addr;
 2801         return (0);
 2802 }
 2803 
 2804 /*
 2805  * Return true if pr1 and pr2 have the same IPv4 address restrictions.
 2806  */
 2807 int
 2808 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
 2809 {
 2810 
 2811         if (pr1 == pr2)
 2812                 return (1);
 2813 
 2814         /*
 2815          * No need to lock since the PR_IP4_USER flag can't be altered for
 2816          * existing prisons.
 2817          */
 2818         while (pr1 != &prison0 &&
 2819 #ifdef VIMAGE
 2820                !(pr1->pr_flags & PR_VNET) &&
 2821 #endif
 2822                !(pr1->pr_flags & PR_IP4_USER))
 2823                 pr1 = pr1->pr_parent;
 2824         while (pr2 != &prison0 &&
 2825 #ifdef VIMAGE
 2826                !(pr2->pr_flags & PR_VNET) &&
 2827 #endif
 2828                !(pr2->pr_flags & PR_IP4_USER))
 2829                 pr2 = pr2->pr_parent;
 2830         return (pr1 == pr2);
 2831 }
 2832 
 2833 /*
 2834  * Make sure our (source) address is set to something meaningful to this
 2835  * jail.
 2836  *
 2837  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 2838  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 2839  * doesn't allow IPv4.  Address passed in in NBO and returned in NBO.
 2840  */
 2841 int
 2842 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
 2843 {
 2844         struct prison *pr;
 2845         struct in_addr ia0;
 2846         int error;
 2847 
 2848         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2849         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2850 
 2851         pr = cred->cr_prison;
 2852         if (!(pr->pr_flags & PR_IP4))
 2853                 return (0);
 2854         mtx_lock(&pr->pr_mtx);
 2855         if (!(pr->pr_flags & PR_IP4)) {
 2856                 mtx_unlock(&pr->pr_mtx);
 2857                 return (0);
 2858         }
 2859         if (pr->pr_ip4 == NULL) {
 2860                 mtx_unlock(&pr->pr_mtx);
 2861                 return (EAFNOSUPPORT);
 2862         }
 2863 
 2864         ia0.s_addr = ntohl(ia->s_addr);
 2865         if (ia0.s_addr == INADDR_LOOPBACK) {
 2866                 ia->s_addr = pr->pr_ip4[0].s_addr;
 2867                 mtx_unlock(&pr->pr_mtx);
 2868                 return (0);
 2869         }
 2870 
 2871         if (ia0.s_addr == INADDR_ANY) {
 2872                 /*
 2873                  * In case there is only 1 IPv4 address, bind directly.
 2874                  */
 2875                 if (pr->pr_ip4s == 1)
 2876                         ia->s_addr = pr->pr_ip4[0].s_addr;
 2877                 mtx_unlock(&pr->pr_mtx);
 2878                 return (0);
 2879         }
 2880 
 2881         error = _prison_check_ip4(pr, ia);
 2882         mtx_unlock(&pr->pr_mtx);
 2883         return (error);
 2884 }
 2885 
 2886 /*
 2887  * Rewrite destination address in case we will connect to loopback address.
 2888  *
 2889  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 2890  * Address passed in in NBO and returned in NBO.
 2891  */
 2892 int
 2893 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
 2894 {
 2895         struct prison *pr;
 2896 
 2897         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2898         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2899 
 2900         pr = cred->cr_prison;
 2901         if (!(pr->pr_flags & PR_IP4))
 2902                 return (0);
 2903         mtx_lock(&pr->pr_mtx);
 2904         if (!(pr->pr_flags & PR_IP4)) {
 2905                 mtx_unlock(&pr->pr_mtx);
 2906                 return (0);
 2907         }
 2908         if (pr->pr_ip4 == NULL) {
 2909                 mtx_unlock(&pr->pr_mtx);
 2910                 return (EAFNOSUPPORT);
 2911         }
 2912 
 2913         if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
 2914                 ia->s_addr = pr->pr_ip4[0].s_addr;
 2915                 mtx_unlock(&pr->pr_mtx);
 2916                 return (0);
 2917         }
 2918 
 2919         /*
 2920          * Return success because nothing had to be changed.
 2921          */
 2922         mtx_unlock(&pr->pr_mtx);
 2923         return (0);
 2924 }
 2925 
 2926 /*
 2927  * Check if given address belongs to the jail referenced by cred/prison.
 2928  *
 2929  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 2930  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 2931  * doesn't allow IPv4.  Address passed in in NBO.
 2932  */
 2933 static int
 2934 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
 2935 {
 2936         int i, a, z, d;
 2937 
 2938         /*
 2939          * Check the primary IP.
 2940          */
 2941         if (pr->pr_ip4[0].s_addr == ia->s_addr)
 2942                 return (0);
 2943 
 2944         /*
 2945          * All the other IPs are sorted so we can do a binary search.
 2946          */
 2947         a = 0;
 2948         z = pr->pr_ip4s - 2;
 2949         while (a <= z) {
 2950                 i = (a + z) / 2;
 2951                 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
 2952                 if (d > 0)
 2953                         z = i - 1;
 2954                 else if (d < 0)
 2955                         a = i + 1;
 2956                 else
 2957                         return (0);
 2958         }
 2959 
 2960         return (EADDRNOTAVAIL);
 2961 }
 2962 
 2963 int
 2964 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
 2965 {
 2966         struct prison *pr;
 2967         int error;
 2968 
 2969         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2970         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2971 
 2972         pr = cred->cr_prison;
 2973         if (!(pr->pr_flags & PR_IP4))
 2974                 return (0);
 2975         mtx_lock(&pr->pr_mtx);
 2976         if (!(pr->pr_flags & PR_IP4)) {
 2977                 mtx_unlock(&pr->pr_mtx);
 2978                 return (0);
 2979         }
 2980         if (pr->pr_ip4 == NULL) {
 2981                 mtx_unlock(&pr->pr_mtx);
 2982                 return (EAFNOSUPPORT);
 2983         }
 2984 
 2985         error = _prison_check_ip4(pr, ia);
 2986         mtx_unlock(&pr->pr_mtx);
 2987         return (error);
 2988 }
 2989 #endif
 2990 
 2991 #ifdef INET6
 2992 static int
 2993 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
 2994 {
 2995         int ii, ij, used;
 2996         struct prison *ppr;
 2997 
 2998         ppr = pr->pr_parent;
 2999         if (!(pr->pr_flags & PR_IP6_USER)) {
 3000                 /* This has no user settings, so just copy the parent's list. */
 3001                 if (pr->pr_ip6s < ppr->pr_ip6s) {
 3002                         /*
 3003                          * There's no room for the parent's list.  Use the
 3004                          * new list buffer, which is assumed to be big enough
 3005                          * (if it was passed).  If there's no buffer, try to
 3006                          * allocate one.
 3007                          */
 3008                         used = 1;
 3009                         if (newip6 == NULL) {
 3010                                 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
 3011                                     M_PRISON, M_NOWAIT);
 3012                                 if (newip6 != NULL)
 3013                                         used = 0;
 3014                         }
 3015                         if (newip6 != NULL) {
 3016                                 bcopy(ppr->pr_ip6, newip6,
 3017                                     ppr->pr_ip6s * sizeof(*newip6));
 3018                                 free(pr->pr_ip6, M_PRISON);
 3019                                 pr->pr_ip6 = newip6;
 3020                                 pr->pr_ip6s = ppr->pr_ip6s;
 3021                         }
 3022                         return (used);
 3023                 }
 3024                 pr->pr_ip6s = ppr->pr_ip6s;
 3025                 if (pr->pr_ip6s > 0)
 3026                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 3027                             pr->pr_ip6s * sizeof(*newip6));
 3028                 else if (pr->pr_ip6 != NULL) {
 3029                         free(pr->pr_ip6, M_PRISON);
 3030                         pr->pr_ip6 = NULL;
 3031                 }
 3032         } else if (pr->pr_ip6s > 0) {
 3033                 /* Remove addresses that aren't in the parent. */
 3034                 for (ij = 0; ij < ppr->pr_ip6s; ij++)
 3035                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
 3036                             &ppr->pr_ip6[ij]))
 3037                                 break;
 3038                 if (ij < ppr->pr_ip6s)
 3039                         ii = 1;
 3040                 else {
 3041                         bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
 3042                             --pr->pr_ip6s * sizeof(*pr->pr_ip6));
 3043                         ii = 0;
 3044                 }
 3045                 for (ij = 1; ii < pr->pr_ip6s; ) {
 3046                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
 3047                             &ppr->pr_ip6[0])) {
 3048                                 ii++;
 3049                                 continue;
 3050                         }
 3051                         switch (ij >= ppr->pr_ip6s ? -1 :
 3052                                 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
 3053                         case -1:
 3054                                 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
 3055                                     (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
 3056                                 break;
 3057                         case 0:
 3058                                 ii++;
 3059                                 ij++;
 3060                                 break;
 3061                         case 1:
 3062                                 ij++;
 3063                                 break;
 3064                         }
 3065                 }
 3066                 if (pr->pr_ip6s == 0) {
 3067                         pr->pr_flags |= PR_IP6_DISABLE;
 3068                         free(pr->pr_ip6, M_PRISON);
 3069                         pr->pr_ip6 = NULL;
 3070                 }
 3071         }
 3072         return 0;
 3073 }
 3074 
 3075 /*
 3076  * Pass back primary IPv6 address for this jail.
 3077  *
 3078  * If not restricted return success but do not alter the address.  Caller has
 3079  * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
 3080  *
 3081  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3082  */
 3083 int
 3084 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
 3085 {
 3086         struct prison *pr;
 3087 
 3088         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3089         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3090 
 3091         pr = cred->cr_prison;
 3092         if (!(pr->pr_flags & PR_IP6))
 3093                 return (0);
 3094         mtx_lock(&pr->pr_mtx);
 3095         if (!(pr->pr_flags & PR_IP6)) {
 3096                 mtx_unlock(&pr->pr_mtx);
 3097                 return (0);
 3098         }
 3099         if (pr->pr_ip6 == NULL) {
 3100                 mtx_unlock(&pr->pr_mtx);
 3101                 return (EAFNOSUPPORT);
 3102         }
 3103 
 3104         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3105         mtx_unlock(&pr->pr_mtx);
 3106         return (0);
 3107 }
 3108 
 3109 /*
 3110  * Return 1 if we should do proper source address selection or are not jailed.
 3111  * We will return 0 if we should bypass source address selection in favour
 3112  * of the primary jail IPv6 address. Only in this case *ia will be updated and
 3113  * returned in NBO.
 3114  * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
 3115  */
 3116 int
 3117 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
 3118 {
 3119         struct prison *pr;
 3120         struct in6_addr lia6;
 3121         int error;
 3122 
 3123         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3124         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3125 
 3126         if (!jailed(cred))
 3127                 return (1);
 3128 
 3129         pr = cred->cr_prison;
 3130         if (pr->pr_flags & PR_IP6_SADDRSEL)
 3131                 return (1);
 3132 
 3133         lia6 = in6addr_any;
 3134         error = prison_get_ip6(cred, &lia6);
 3135         if (error)
 3136                 return (error);
 3137         if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
 3138                 return (1);
 3139 
 3140         bcopy(&lia6, ia6, sizeof(struct in6_addr));
 3141         return (0);
 3142 }
 3143 
 3144 /*
 3145  * Return true if pr1 and pr2 have the same IPv6 address restrictions.
 3146  */
 3147 int
 3148 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
 3149 {
 3150 
 3151         if (pr1 == pr2)
 3152                 return (1);
 3153 
 3154         while (pr1 != &prison0 &&
 3155 #ifdef VIMAGE
 3156                !(pr1->pr_flags & PR_VNET) &&
 3157 #endif
 3158                !(pr1->pr_flags & PR_IP6_USER))
 3159                 pr1 = pr1->pr_parent;
 3160         while (pr2 != &prison0 &&
 3161 #ifdef VIMAGE
 3162                !(pr2->pr_flags & PR_VNET) &&
 3163 #endif
 3164                !(pr2->pr_flags & PR_IP6_USER))
 3165                 pr2 = pr2->pr_parent;
 3166         return (pr1 == pr2);
 3167 }
 3168 
 3169 /*
 3170  * Make sure our (source) address is set to something meaningful to this jail.
 3171  *
 3172  * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
 3173  * when needed while binding.
 3174  *
 3175  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3176  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3177  * doesn't allow IPv6.
 3178  */
 3179 int
 3180 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
 3181 {
 3182         struct prison *pr;
 3183         int error;
 3184 
 3185         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3186         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3187 
 3188         pr = cred->cr_prison;
 3189         if (!(pr->pr_flags & PR_IP6))
 3190                 return (0);
 3191         mtx_lock(&pr->pr_mtx);
 3192         if (!(pr->pr_flags & PR_IP6)) {
 3193                 mtx_unlock(&pr->pr_mtx);
 3194                 return (0);
 3195         }
 3196         if (pr->pr_ip6 == NULL) {
 3197                 mtx_unlock(&pr->pr_mtx);
 3198                 return (EAFNOSUPPORT);
 3199         }
 3200 
 3201         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3202                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3203                 mtx_unlock(&pr->pr_mtx);
 3204                 return (0);
 3205         }
 3206 
 3207         if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
 3208                 /*
 3209                  * In case there is only 1 IPv6 address, and v6only is true,
 3210                  * then bind directly.
 3211                  */
 3212                 if (v6only != 0 && pr->pr_ip6s == 1)
 3213                         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3214                 mtx_unlock(&pr->pr_mtx);
 3215                 return (0);
 3216         }
 3217 
 3218         error = _prison_check_ip6(pr, ia6);
 3219         mtx_unlock(&pr->pr_mtx);
 3220         return (error);
 3221 }
 3222 
 3223 /*
 3224  * Rewrite destination address in case we will connect to loopback address.
 3225  *
 3226  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3227  */
 3228 int
 3229 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
 3230 {
 3231         struct prison *pr;
 3232 
 3233         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3234         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3235 
 3236         pr = cred->cr_prison;
 3237         if (!(pr->pr_flags & PR_IP6))
 3238                 return (0);
 3239         mtx_lock(&pr->pr_mtx);
 3240         if (!(pr->pr_flags & PR_IP6)) {
 3241                 mtx_unlock(&pr->pr_mtx);
 3242                 return (0);
 3243         }
 3244         if (pr->pr_ip6 == NULL) {
 3245                 mtx_unlock(&pr->pr_mtx);
 3246                 return (EAFNOSUPPORT);
 3247         }
 3248 
 3249         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3250                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3251                 mtx_unlock(&pr->pr_mtx);
 3252                 return (0);
 3253         }
 3254 
 3255         /*
 3256          * Return success because nothing had to be changed.
 3257          */
 3258         mtx_unlock(&pr->pr_mtx);
 3259         return (0);
 3260 }
 3261 
 3262 /*
 3263  * Check if given address belongs to the jail referenced by cred/prison.
 3264  *
 3265  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3266  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3267  * doesn't allow IPv6.
 3268  */
 3269 static int
 3270 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
 3271 {
 3272         int i, a, z, d;
 3273 
 3274         /*
 3275          * Check the primary IP.
 3276          */
 3277         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
 3278                 return (0);
 3279 
 3280         /*
 3281          * All the other IPs are sorted so we can do a binary search.
 3282          */
 3283         a = 0;
 3284         z = pr->pr_ip6s - 2;
 3285         while (a <= z) {
 3286                 i = (a + z) / 2;
 3287                 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
 3288                 if (d > 0)
 3289                         z = i - 1;
 3290                 else if (d < 0)
 3291                         a = i + 1;
 3292                 else
 3293                         return (0);
 3294         }
 3295 
 3296         return (EADDRNOTAVAIL);
 3297 }
 3298 
 3299 int
 3300 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
 3301 {
 3302         struct prison *pr;
 3303         int error;
 3304 
 3305         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3306         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3307 
 3308         pr = cred->cr_prison;
 3309         if (!(pr->pr_flags & PR_IP6))
 3310                 return (0);
 3311         mtx_lock(&pr->pr_mtx);
 3312         if (!(pr->pr_flags & PR_IP6)) {
 3313                 mtx_unlock(&pr->pr_mtx);
 3314                 return (0);
 3315         }
 3316         if (pr->pr_ip6 == NULL) {
 3317                 mtx_unlock(&pr->pr_mtx);
 3318                 return (EAFNOSUPPORT);
 3319         }
 3320 
 3321         error = _prison_check_ip6(pr, ia6);
 3322         mtx_unlock(&pr->pr_mtx);
 3323         return (error);
 3324 }
 3325 #endif
 3326 
 3327 /*
 3328  * Check if a jail supports the given address family.
 3329  *
 3330  * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
 3331  * if not.
 3332  */
 3333 int
 3334 prison_check_af(struct ucred *cred, int af)
 3335 {
 3336         struct prison *pr;
 3337         int error;
 3338 
 3339         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3340 
 3341         pr = cred->cr_prison;
 3342 #ifdef VIMAGE
 3343         /* Prisons with their own network stack are not limited. */
 3344         if (prison_owns_vnet(cred))
 3345                 return (0);
 3346 #endif
 3347 
 3348         error = 0;
 3349         switch (af)
 3350         {
 3351 #ifdef INET
 3352         case AF_INET:
 3353                 if (pr->pr_flags & PR_IP4)
 3354                 {
 3355                         mtx_lock(&pr->pr_mtx);
 3356                         if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
 3357                                 error = EAFNOSUPPORT;
 3358                         mtx_unlock(&pr->pr_mtx);
 3359                 }
 3360                 break;
 3361 #endif
 3362 #ifdef INET6
 3363         case AF_INET6:
 3364                 if (pr->pr_flags & PR_IP6)
 3365                 {
 3366                         mtx_lock(&pr->pr_mtx);
 3367                         if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
 3368                                 error = EAFNOSUPPORT;
 3369                         mtx_unlock(&pr->pr_mtx);
 3370                 }
 3371                 break;
 3372 #endif
 3373         case AF_LOCAL:
 3374         case AF_ROUTE:
 3375                 break;
 3376         default:
 3377                 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
 3378                         error = EAFNOSUPPORT;
 3379         }
 3380         return (error);
 3381 }
 3382 
 3383 /*
 3384  * Check if given address belongs to the jail referenced by cred (wrapper to
 3385  * prison_check_ip[46]).
 3386  *
 3387  * Returns 0 if jail doesn't restrict the address family or if address belongs
 3388  * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
 3389  * the jail doesn't allow the address family.  IPv4 Address passed in in NBO.
 3390  */
 3391 int
 3392 prison_if(struct ucred *cred, struct sockaddr *sa)
 3393 {
 3394 #ifdef INET
 3395         struct sockaddr_in *sai;
 3396 #endif
 3397 #ifdef INET6
 3398         struct sockaddr_in6 *sai6;
 3399 #endif
 3400         int error;
 3401 
 3402         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3403         KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
 3404 
 3405 #ifdef VIMAGE
 3406         if (prison_owns_vnet(cred))
 3407                 return (0);
 3408 #endif
 3409 
 3410         error = 0;
 3411         switch (sa->sa_family)
 3412         {
 3413 #ifdef INET
 3414         case AF_INET:
 3415                 sai = (struct sockaddr_in *)sa;
 3416                 error = prison_check_ip4(cred, &sai->sin_addr);
 3417                 break;
 3418 #endif
 3419 #ifdef INET6
 3420         case AF_INET6:
 3421                 sai6 = (struct sockaddr_in6 *)sa;
 3422                 error = prison_check_ip6(cred, &sai6->sin6_addr);
 3423                 break;
 3424 #endif
 3425         default:
 3426                 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
 3427                         error = EAFNOSUPPORT;
 3428         }
 3429         return (error);
 3430 }
 3431 
 3432 /*
 3433  * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
 3434  */
 3435 int
 3436 prison_check(struct ucred *cred1, struct ucred *cred2)
 3437 {
 3438 
 3439         return ((cred1->cr_prison == cred2->cr_prison ||
 3440             prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
 3441 }
 3442 
 3443 /*
 3444  * Return 1 if p2 is a child of p1, otherwise 0.
 3445  */
 3446 int
 3447 prison_ischild(struct prison *pr1, struct prison *pr2)
 3448 {
 3449 
 3450         for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
 3451                 if (pr1 == pr2)
 3452                         return (1);
 3453         return (0);
 3454 }
 3455 
 3456 /*
 3457  * Return 1 if the passed credential is in a jail, otherwise 0.
 3458  */
 3459 int
 3460 jailed(struct ucred *cred)
 3461 {
 3462 
 3463         return (cred->cr_prison != &prison0);
 3464 }
 3465 
 3466 /*
 3467  * Return 1 if the passed credential is in a jail and that jail does not
 3468  * have its own virtual network stack, otherwise 0.
 3469  */
 3470 int
 3471 jailed_without_vnet(struct ucred *cred)
 3472 {
 3473 
 3474         if (!jailed(cred))
 3475                 return (0);
 3476 #ifdef VIMAGE
 3477         if (prison_owns_vnet(cred))
 3478                 return (0);
 3479 #endif
 3480 
 3481         return (1);
 3482 }
 3483 
 3484 /*
 3485  * Return the correct hostname (domainname, et al) for the passed credential.
 3486  */
 3487 void
 3488 getcredhostname(struct ucred *cred, char *buf, size_t size)
 3489 {
 3490         struct prison *pr;
 3491 
 3492         /*
 3493          * A NULL credential can be used to shortcut to the physical
 3494          * system's hostname.
 3495          */
 3496         pr = (cred != NULL) ? cred->cr_prison : &prison0;
 3497         mtx_lock(&pr->pr_mtx);
 3498         strlcpy(buf, pr->pr_hostname, size);
 3499         mtx_unlock(&pr->pr_mtx);
 3500 }
 3501 
 3502 void
 3503 getcreddomainname(struct ucred *cred, char *buf, size_t size)
 3504 {
 3505 
 3506         mtx_lock(&cred->cr_prison->pr_mtx);
 3507         strlcpy(buf, cred->cr_prison->pr_domainname, size);
 3508         mtx_unlock(&cred->cr_prison->pr_mtx);
 3509 }
 3510 
 3511 void
 3512 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
 3513 {
 3514 
 3515         mtx_lock(&cred->cr_prison->pr_mtx);
 3516         strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
 3517         mtx_unlock(&cred->cr_prison->pr_mtx);
 3518 }
 3519 
 3520 void
 3521 getcredhostid(struct ucred *cred, unsigned long *hostid)
 3522 {
 3523 
 3524         mtx_lock(&cred->cr_prison->pr_mtx);
 3525         *hostid = cred->cr_prison->pr_hostid;
 3526         mtx_unlock(&cred->cr_prison->pr_mtx);
 3527 }
 3528 
 3529 #ifdef VIMAGE
 3530 /*
 3531  * Determine whether the prison represented by cred owns
 3532  * its vnet rather than having it inherited.
 3533  *
 3534  * Returns 1 in case the prison owns the vnet, 0 otherwise.
 3535  */
 3536 int
 3537 prison_owns_vnet(struct ucred *cred)
 3538 {
 3539 
 3540         /*
 3541          * vnets cannot be added/removed after jail creation,
 3542          * so no need to lock here.
 3543          */
 3544         return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
 3545 }
 3546 #endif
 3547 
 3548 /*
 3549  * Determine whether the subject represented by cred can "see"
 3550  * status of a mount point.
 3551  * Returns: 0 for permitted, ENOENT otherwise.
 3552  * XXX: This function should be called cr_canseemount() and should be
 3553  *      placed in kern_prot.c.
 3554  */
 3555 int
 3556 prison_canseemount(struct ucred *cred, struct mount *mp)
 3557 {
 3558         struct prison *pr;
 3559         struct statfs *sp;
 3560         size_t len;
 3561 
 3562         pr = cred->cr_prison;
 3563         if (pr->pr_enforce_statfs == 0)
 3564                 return (0);
 3565         if (pr->pr_root->v_mount == mp)
 3566                 return (0);
 3567         if (pr->pr_enforce_statfs == 2)
 3568                 return (ENOENT);
 3569         /*
 3570          * If jail's chroot directory is set to "/" we should be able to see
 3571          * all mount-points from inside a jail.
 3572          * This is ugly check, but this is the only situation when jail's
 3573          * directory ends with '/'.
 3574          */
 3575         if (strcmp(pr->pr_path, "/") == 0)
 3576                 return (0);
 3577         len = strlen(pr->pr_path);
 3578         sp = &mp->mnt_stat;
 3579         if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
 3580                 return (ENOENT);
 3581         /*
 3582          * Be sure that we don't have situation where jail's root directory
 3583          * is "/some/path" and mount point is "/some/pathpath".
 3584          */
 3585         if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
 3586                 return (ENOENT);
 3587         return (0);
 3588 }
 3589 
 3590 void
 3591 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
 3592 {
 3593         char jpath[MAXPATHLEN];
 3594         struct prison *pr;
 3595         size_t len;
 3596 
 3597         pr = cred->cr_prison;
 3598         if (pr->pr_enforce_statfs == 0)
 3599                 return;
 3600         if (prison_canseemount(cred, mp) != 0) {
 3601                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3602                 strlcpy(sp->f_mntonname, "[restricted]",
 3603                     sizeof(sp->f_mntonname));
 3604                 return;
 3605         }
 3606         if (pr->pr_root->v_mount == mp) {
 3607                 /*
 3608                  * Clear current buffer data, so we are sure nothing from
 3609                  * the valid path left there.
 3610                  */
 3611                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3612                 *sp->f_mntonname = '/';
 3613                 return;
 3614         }
 3615         /*
 3616          * If jail's chroot directory is set to "/" we should be able to see
 3617          * all mount-points from inside a jail.
 3618          */
 3619         if (strcmp(pr->pr_path, "/") == 0)
 3620                 return;
 3621         len = strlen(pr->pr_path);
 3622         strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
 3623         /*
 3624          * Clear current buffer data, so we are sure nothing from
 3625          * the valid path left there.
 3626          */
 3627         bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3628         if (*jpath == '\0') {
 3629                 /* Should never happen. */
 3630                 *sp->f_mntonname = '/';
 3631         } else {
 3632                 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
 3633         }
 3634 }
 3635 
 3636 /*
 3637  * Check with permission for a specific privilege is granted within jail.  We
 3638  * have a specific list of accepted privileges; the rest are denied.
 3639  */
 3640 int
 3641 prison_priv_check(struct ucred *cred, int priv)
 3642 {
 3643 
 3644         if (!jailed(cred))
 3645                 return (0);
 3646 
 3647 #ifdef VIMAGE
 3648         /*
 3649          * Privileges specific to prisons with a virtual network stack.
 3650          * There might be a duplicate entry here in case the privilege
 3651          * is only granted conditionally in the legacy jail case.
 3652          */
 3653         switch (priv) {
 3654 #ifdef notyet
 3655                 /*
 3656                  * NFS-specific privileges.
 3657                  */
 3658         case PRIV_NFS_DAEMON:
 3659         case PRIV_NFS_LOCKD:
 3660 #endif
 3661                 /*
 3662                  * Network stack privileges.
 3663                  */
 3664         case PRIV_NET_BRIDGE:
 3665         case PRIV_NET_GRE:
 3666         case PRIV_NET_BPF:
 3667         case PRIV_NET_RAW:              /* Dup, cond. in legacy jail case. */
 3668         case PRIV_NET_ROUTE:
 3669         case PRIV_NET_TAP:
 3670         case PRIV_NET_SETIFMTU:
 3671         case PRIV_NET_SETIFFLAGS:
 3672         case PRIV_NET_SETIFCAP:
 3673         case PRIV_NET_SETIFDESCR:
 3674         case PRIV_NET_SETIFNAME :
 3675         case PRIV_NET_SETIFMETRIC:
 3676         case PRIV_NET_SETIFPHYS:
 3677         case PRIV_NET_SETIFMAC:
 3678         case PRIV_NET_ADDMULTI:
 3679         case PRIV_NET_DELMULTI:
 3680         case PRIV_NET_HWIOCTL:
 3681         case PRIV_NET_SETLLADDR:
 3682         case PRIV_NET_ADDIFGROUP:
 3683         case PRIV_NET_DELIFGROUP:
 3684         case PRIV_NET_IFCREATE:
 3685         case PRIV_NET_IFDESTROY:
 3686         case PRIV_NET_ADDIFADDR:
 3687         case PRIV_NET_DELIFADDR:
 3688         case PRIV_NET_LAGG:
 3689         case PRIV_NET_GIF:
 3690         case PRIV_NET_SETIFVNET:
 3691         case PRIV_NET_SETIFFIB:
 3692 
 3693                 /*
 3694                  * 802.11-related privileges.
 3695                  */
 3696         case PRIV_NET80211_GETKEY:
 3697 #ifdef notyet
 3698         case PRIV_NET80211_MANAGE:              /* XXX-BZ discuss with sam@ */
 3699 #endif
 3700 
 3701 #ifdef notyet
 3702                 /*
 3703                  * AppleTalk privileges.
 3704                  */
 3705         case PRIV_NETATALK_RESERVEDPORT:
 3706 
 3707                 /*
 3708                  * ATM privileges.
 3709                  */
 3710         case PRIV_NETATM_CFG:
 3711         case PRIV_NETATM_ADD:
 3712         case PRIV_NETATM_DEL:
 3713         case PRIV_NETATM_SET:
 3714 
 3715                 /*
 3716                  * Bluetooth privileges.
 3717                  */
 3718         case PRIV_NETBLUETOOTH_RAW:
 3719 #endif
 3720 
 3721                 /*
 3722                  * Netgraph and netgraph module privileges.
 3723                  */
 3724         case PRIV_NETGRAPH_CONTROL:
 3725 #ifdef notyet
 3726         case PRIV_NETGRAPH_TTY:
 3727 #endif
 3728 
 3729                 /*
 3730                  * IPv4 and IPv6 privileges.
 3731                  */
 3732         case PRIV_NETINET_IPFW:
 3733         case PRIV_NETINET_DIVERT:
 3734         case PRIV_NETINET_PF:
 3735         case PRIV_NETINET_DUMMYNET:
 3736         case PRIV_NETINET_CARP:
 3737         case PRIV_NETINET_MROUTE:
 3738         case PRIV_NETINET_RAW:
 3739         case PRIV_NETINET_ADDRCTRL6:
 3740         case PRIV_NETINET_ND6:
 3741         case PRIV_NETINET_SCOPE6:
 3742         case PRIV_NETINET_ALIFETIME6:
 3743         case PRIV_NETINET_IPSEC:
 3744         case PRIV_NETINET_BINDANY:
 3745 
 3746 #ifdef notyet
 3747                 /*
 3748                  * IPX/SPX privileges.
 3749                  */
 3750         case PRIV_NETIPX_RESERVEDPORT:
 3751         case PRIV_NETIPX_RAW:
 3752 
 3753                 /*
 3754                  * NCP privileges.
 3755                  */
 3756         case PRIV_NETNCP:
 3757 
 3758                 /*
 3759                  * SMB privileges.
 3760                  */
 3761         case PRIV_NETSMB:
 3762 #endif
 3763 
 3764         /*
 3765          * No default: or deny here.
 3766          * In case of no permit fall through to next switch().
 3767          */
 3768                 if (cred->cr_prison->pr_flags & PR_VNET)
 3769                         return (0);
 3770         }
 3771 #endif /* VIMAGE */
 3772 
 3773         switch (priv) {
 3774 
 3775                 /*
 3776                  * Allow ktrace privileges for root in jail.
 3777                  */
 3778         case PRIV_KTRACE:
 3779 
 3780 #if 0
 3781                 /*
 3782                  * Allow jailed processes to configure audit identity and
 3783                  * submit audit records (login, etc).  In the future we may
 3784                  * want to further refine the relationship between audit and
 3785                  * jail.
 3786                  */
 3787         case PRIV_AUDIT_GETAUDIT:
 3788         case PRIV_AUDIT_SETAUDIT:
 3789         case PRIV_AUDIT_SUBMIT:
 3790 #endif
 3791 
 3792                 /*
 3793                  * Allow jailed processes to manipulate process UNIX
 3794                  * credentials in any way they see fit.
 3795                  */
 3796         case PRIV_CRED_SETUID:
 3797         case PRIV_CRED_SETEUID:
 3798         case PRIV_CRED_SETGID:
 3799         case PRIV_CRED_SETEGID:
 3800         case PRIV_CRED_SETGROUPS:
 3801         case PRIV_CRED_SETREUID:
 3802         case PRIV_CRED_SETREGID:
 3803         case PRIV_CRED_SETRESUID:
 3804         case PRIV_CRED_SETRESGID:
 3805 
 3806                 /*
 3807                  * Jail implements visibility constraints already, so allow
 3808                  * jailed root to override uid/gid-based constraints.
 3809                  */
 3810         case PRIV_SEEOTHERGIDS:
 3811         case PRIV_SEEOTHERUIDS:
 3812 
 3813                 /*
 3814                  * Jail implements inter-process debugging limits already, so
 3815                  * allow jailed root various debugging privileges.
 3816                  */
 3817         case PRIV_DEBUG_DIFFCRED:
 3818         case PRIV_DEBUG_SUGID:
 3819         case PRIV_DEBUG_UNPRIV:
 3820 
 3821                 /*
 3822                  * Allow jail to set various resource limits and login
 3823                  * properties, and for now, exceed process resource limits.
 3824                  */
 3825         case PRIV_PROC_LIMIT:
 3826         case PRIV_PROC_SETLOGIN:
 3827         case PRIV_PROC_SETRLIMIT:
 3828 
 3829                 /*
 3830                  * System V and POSIX IPC privileges are granted in jail.
 3831                  */
 3832         case PRIV_IPC_READ:
 3833         case PRIV_IPC_WRITE:
 3834         case PRIV_IPC_ADMIN:
 3835         case PRIV_IPC_MSGSIZE:
 3836         case PRIV_MQ_ADMIN:
 3837 
 3838                 /*
 3839                  * Jail operations within a jail work on child jails.
 3840                  */
 3841         case PRIV_JAIL_ATTACH:
 3842         case PRIV_JAIL_SET:
 3843         case PRIV_JAIL_REMOVE:
 3844 
 3845                 /*
 3846                  * Jail implements its own inter-process limits, so allow
 3847                  * root processes in jail to change scheduling on other
 3848                  * processes in the same jail.  Likewise for signalling.
 3849                  */
 3850         case PRIV_SCHED_DIFFCRED:
 3851         case PRIV_SCHED_CPUSET:
 3852         case PRIV_SIGNAL_DIFFCRED:
 3853         case PRIV_SIGNAL_SUGID:
 3854 
 3855                 /*
 3856                  * Allow jailed processes to write to sysctls marked as jail
 3857                  * writable.
 3858                  */
 3859         case PRIV_SYSCTL_WRITEJAIL:
 3860 
 3861                 /*
 3862                  * Allow root in jail to manage a variety of quota
 3863                  * properties.  These should likely be conditional on a
 3864                  * configuration option.
 3865                  */
 3866         case PRIV_VFS_GETQUOTA:
 3867         case PRIV_VFS_SETQUOTA:
 3868 
 3869                 /*
 3870                  * Since Jail relies on chroot() to implement file system
 3871                  * protections, grant many VFS privileges to root in jail.
 3872                  * Be careful to exclude mount-related and NFS-related
 3873                  * privileges.
 3874                  */
 3875         case PRIV_VFS_READ:
 3876         case PRIV_VFS_WRITE:
 3877         case PRIV_VFS_ADMIN:
 3878         case PRIV_VFS_EXEC:
 3879         case PRIV_VFS_LOOKUP:
 3880         case PRIV_VFS_BLOCKRESERVE:     /* XXXRW: Slightly surprising. */
 3881         case PRIV_VFS_CHFLAGS_DEV:
 3882         case PRIV_VFS_CHOWN:
 3883         case PRIV_VFS_CHROOT:
 3884         case PRIV_VFS_RETAINSUGID:
 3885         case PRIV_VFS_FCHROOT:
 3886         case PRIV_VFS_LINK:
 3887         case PRIV_VFS_SETGID:
 3888         case PRIV_VFS_STAT:
 3889         case PRIV_VFS_STICKYFILE:
 3890 
 3891                 /*
 3892                  * As in the non-jail case, non-root users are expected to be
 3893                  * able to read kernel/phyiscal memory (provided /dev/[k]mem
 3894                  * exists in the jail and they have permission to access it).
 3895                  */
 3896         case PRIV_KMEM_READ:
 3897                 return (0);
 3898 
 3899                 /*
 3900                  * Depending on the global setting, allow privilege of
 3901                  * setting system flags.
 3902                  */
 3903         case PRIV_VFS_SYSFLAGS:
 3904                 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
 3905                         return (0);
 3906                 else
 3907                         return (EPERM);
 3908 
 3909                 /*
 3910                  * Depending on the global setting, allow privilege of
 3911                  * mounting/unmounting file systems.
 3912                  */
 3913         case PRIV_VFS_MOUNT:
 3914         case PRIV_VFS_UNMOUNT:
 3915         case PRIV_VFS_MOUNT_NONUSER:
 3916         case PRIV_VFS_MOUNT_OWNER:
 3917                 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
 3918                     cred->cr_prison->pr_enforce_statfs < 2)
 3919                         return (0);
 3920                 else
 3921                         return (EPERM);
 3922 
 3923                 /*
 3924                  * Allow jailed root to bind reserved ports and reuse in-use
 3925                  * ports.
 3926                  */
 3927         case PRIV_NETINET_RESERVEDPORT:
 3928         case PRIV_NETINET_REUSEPORT:
 3929                 return (0);
 3930 
 3931                 /*
 3932                  * Allow jailed root to set certian IPv4/6 (option) headers.
 3933                  */
 3934         case PRIV_NETINET_SETHDROPTS:
 3935                 return (0);
 3936 
 3937                 /*
 3938                  * Conditionally allow creating raw sockets in jail.
 3939                  */
 3940         case PRIV_NETINET_RAW:
 3941                 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
 3942                         return (0);
 3943                 else
 3944                         return (EPERM);
 3945 
 3946                 /*
 3947                  * Since jail implements its own visibility limits on netstat
 3948                  * sysctls, allow getcred.  This allows identd to work in
 3949                  * jail.
 3950                  */
 3951         case PRIV_NETINET_GETCRED:
 3952                 return (0);
 3953 
 3954                 /*
 3955                  * Allow jailed root to set loginclass.
 3956                  */
 3957         case PRIV_PROC_SETLOGINCLASS:
 3958                 return (0);
 3959 
 3960         default:
 3961                 /*
 3962                  * In all remaining cases, deny the privilege request.  This
 3963                  * includes almost all network privileges, many system
 3964                  * configuration privileges.
 3965                  */
 3966                 return (EPERM);
 3967         }
 3968 }
 3969 
 3970 /*
 3971  * Return the part of pr2's name that is relative to pr1, or the whole name
 3972  * if it does not directly follow.
 3973  */
 3974 
 3975 char *
 3976 prison_name(struct prison *pr1, struct prison *pr2)
 3977 {
 3978         char *name;
 3979 
 3980         /* Jails see themselves as "" (if they see themselves at all). */
 3981         if (pr1 == pr2)
 3982                 return "";
 3983         name = pr2->pr_name;
 3984         if (prison_ischild(pr1, pr2)) {
 3985                 /*
 3986                  * pr1 isn't locked (and allprison_lock may not be either)
 3987                  * so its length can't be counted on.  But the number of dots
 3988                  * can be counted on - and counted.
 3989                  */
 3990                 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
 3991                         name = strchr(name, '.') + 1;
 3992         }
 3993         return (name);
 3994 }
 3995 
 3996 /*
 3997  * Return the part of pr2's path that is relative to pr1, or the whole path
 3998  * if it does not directly follow.
 3999  */
 4000 static char *
 4001 prison_path(struct prison *pr1, struct prison *pr2)
 4002 {
 4003         char *path1, *path2;
 4004         int len1;
 4005 
 4006         path1 = pr1->pr_path;
 4007         path2 = pr2->pr_path;
 4008         if (!strcmp(path1, "/"))
 4009                 return (path2);
 4010         len1 = strlen(path1);
 4011         if (strncmp(path1, path2, len1))
 4012                 return (path2);
 4013         if (path2[len1] == '\0')
 4014                 return "/";
 4015         if (path2[len1] == '/')
 4016                 return (path2 + len1);
 4017         return (path2);
 4018 }
 4019 
 4020 
 4021 /*
 4022  * Jail-related sysctls.
 4023  */
 4024 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
 4025     "Jails");
 4026 
 4027 static int
 4028 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
 4029 {
 4030         struct xprison *xp;
 4031         struct prison *pr, *cpr;
 4032 #ifdef INET
 4033         struct in_addr *ip4 = NULL;
 4034         int ip4s = 0;
 4035 #endif
 4036 #ifdef INET6
 4037         struct in6_addr *ip6 = NULL;
 4038         int ip6s = 0;
 4039 #endif
 4040         int descend, error;
 4041 
 4042         xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
 4043         pr = req->td->td_ucred->cr_prison;
 4044         error = 0;
 4045         sx_slock(&allprison_lock);
 4046         FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 4047 #if defined(INET) || defined(INET6)
 4048  again:
 4049 #endif
 4050                 mtx_lock(&cpr->pr_mtx);
 4051 #ifdef INET
 4052                 if (cpr->pr_ip4s > 0) {
 4053                         if (ip4s < cpr->pr_ip4s) {
 4054                                 ip4s = cpr->pr_ip4s;
 4055                                 mtx_unlock(&cpr->pr_mtx);
 4056                                 ip4 = realloc(ip4, ip4s *
 4057                                     sizeof(struct in_addr), M_TEMP, M_WAITOK);
 4058                                 goto again;
 4059                         }
 4060                         bcopy(cpr->pr_ip4, ip4,
 4061                             cpr->pr_ip4s * sizeof(struct in_addr));
 4062                 }
 4063 #endif
 4064 #ifdef INET6
 4065                 if (cpr->pr_ip6s > 0) {
 4066                         if (ip6s < cpr->pr_ip6s) {
 4067                                 ip6s = cpr->pr_ip6s;
 4068                                 mtx_unlock(&cpr->pr_mtx);
 4069                                 ip6 = realloc(ip6, ip6s *
 4070                                     sizeof(struct in6_addr), M_TEMP, M_WAITOK);
 4071                                 goto again;
 4072                         }
 4073                         bcopy(cpr->pr_ip6, ip6,
 4074                             cpr->pr_ip6s * sizeof(struct in6_addr));
 4075                 }
 4076 #endif
 4077                 if (cpr->pr_ref == 0) {
 4078                         mtx_unlock(&cpr->pr_mtx);
 4079                         continue;
 4080                 }
 4081                 bzero(xp, sizeof(*xp));
 4082                 xp->pr_version = XPRISON_VERSION;
 4083                 xp->pr_id = cpr->pr_id;
 4084                 xp->pr_state = cpr->pr_uref > 0
 4085                     ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
 4086                 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
 4087                 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
 4088                 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
 4089 #ifdef INET
 4090                 xp->pr_ip4s = cpr->pr_ip4s;
 4091 #endif
 4092 #ifdef INET6
 4093                 xp->pr_ip6s = cpr->pr_ip6s;
 4094 #endif
 4095                 mtx_unlock(&cpr->pr_mtx);
 4096                 error = SYSCTL_OUT(req, xp, sizeof(*xp));
 4097                 if (error)
 4098                         break;
 4099 #ifdef INET
 4100                 if (xp->pr_ip4s > 0) {
 4101                         error = SYSCTL_OUT(req, ip4,
 4102                             xp->pr_ip4s * sizeof(struct in_addr));
 4103                         if (error)
 4104                                 break;
 4105                 }
 4106 #endif
 4107 #ifdef INET6
 4108                 if (xp->pr_ip6s > 0) {
 4109                         error = SYSCTL_OUT(req, ip6,
 4110                             xp->pr_ip6s * sizeof(struct in6_addr));
 4111                         if (error)
 4112                                 break;
 4113                 }
 4114 #endif
 4115         }
 4116         sx_sunlock(&allprison_lock);
 4117         free(xp, M_TEMP);
 4118 #ifdef INET
 4119         free(ip4, M_TEMP);
 4120 #endif
 4121 #ifdef INET6
 4122         free(ip6, M_TEMP);
 4123 #endif
 4124         return (error);
 4125 }
 4126 
 4127 SYSCTL_OID(_security_jail, OID_AUTO, list,
 4128     CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4129     sysctl_jail_list, "S", "List of active jails");
 4130 
 4131 static int
 4132 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
 4133 {
 4134         int error, injail;
 4135 
 4136         injail = jailed(req->td->td_ucred);
 4137         error = SYSCTL_OUT(req, &injail, sizeof(injail));
 4138 
 4139         return (error);
 4140 }
 4141 
 4142 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
 4143     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4144     sysctl_jail_jailed, "I", "Process in jail?");
 4145 
 4146 static int
 4147 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
 4148 {
 4149         int error, havevnet;
 4150 #ifdef VIMAGE
 4151         struct ucred *cred = req->td->td_ucred;
 4152 
 4153         havevnet = jailed(cred) && prison_owns_vnet(cred);
 4154 #else
 4155         havevnet = 0;
 4156 #endif
 4157         error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
 4158 
 4159         return (error);
 4160 }
 4161 
 4162 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
 4163     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4164     sysctl_jail_vnet, "I", "Jail owns VNET?");
 4165 
 4166 #if defined(INET) || defined(INET6)
 4167 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
 4168     &jail_max_af_ips, 0,
 4169     "Number of IP addresses a jail may have at most per address family");
 4170 #endif
 4171 
 4172 /*
 4173  * Default parameters for jail(2) compatability.  For historical reasons,
 4174  * the sysctl names have varying similarity to the parameter names.  Prisons
 4175  * just see their own parameters, and can't change them.
 4176  */
 4177 static int
 4178 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
 4179 {
 4180         struct prison *pr;
 4181         int allow, error, i;
 4182 
 4183         pr = req->td->td_ucred->cr_prison;
 4184         allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
 4185 
 4186         /* Get the current flag value, and convert it to a boolean. */
 4187         i = (allow & arg2) ? 1 : 0;
 4188         if (arg1 != NULL)
 4189                 i = !i;
 4190         error = sysctl_handle_int(oidp, &i, 0, req);
 4191         if (error || !req->newptr)
 4192                 return (error);
 4193         i = i ? arg2 : 0;
 4194         if (arg1 != NULL)
 4195                 i ^= arg2;
 4196         /*
 4197          * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
 4198          * for writing.
 4199          */
 4200         mtx_lock(&prison0.pr_mtx);
 4201         jail_default_allow = (jail_default_allow & ~arg2) | i;
 4202         mtx_unlock(&prison0.pr_mtx);
 4203         return (0);
 4204 }
 4205 
 4206 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
 4207     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4208     NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
 4209     "Processes in jail can set their hostnames");
 4210 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
 4211     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4212     (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
 4213     "Processes in jail are limited to creating UNIX/IP/route sockets only");
 4214 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
 4215     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4216     NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
 4217     "Processes in jail can use System V IPC primitives");
 4218 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
 4219     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4220     NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
 4221     "Prison root can create raw sockets");
 4222 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
 4223     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4224     NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
 4225     "Processes in jail can alter system file flags");
 4226 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
 4227     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4228     NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
 4229     "Processes in jail can mount/unmount jail-friendly file systems");
 4230 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
 4231     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4232     NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
 4233     "Processes in jail can mount the devfs file system");
 4234 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
 4235     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4236     NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
 4237     "Processes in jail can mount the nullfs file system");
 4238 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
 4239     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4240     NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
 4241     "Processes in jail can mount the procfs file system");
 4242 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
 4243     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4244     NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
 4245     "Processes in jail can mount the tmpfs file system");
 4246 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
 4247     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4248     NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
 4249     "Processes in jail can mount the zfs file system");
 4250 
 4251 static int
 4252 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
 4253 {
 4254         struct prison *pr;
 4255         int level, error;
 4256 
 4257         pr = req->td->td_ucred->cr_prison;
 4258         level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
 4259         error = sysctl_handle_int(oidp, &level, 0, req);
 4260         if (error || !req->newptr)
 4261                 return (error);
 4262         *(int *)arg1 = level;
 4263         return (0);
 4264 }
 4265 
 4266 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
 4267     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4268     &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
 4269     sysctl_jail_default_level, "I",
 4270     "Processes in jail cannot see all mounted file systems");
 4271 
 4272 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
 4273     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
 4274     &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
 4275     sysctl_jail_default_level, "I",
 4276     "Ruleset for the devfs filesystem in jail");
 4277 
 4278 /*
 4279  * Nodes to describe jail parameters.  Maximum length of string parameters
 4280  * is returned in the string itself, and the other parameters exist merely
 4281  * to make themselves and their types known.
 4282  */
 4283 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
 4284     "Jail parameters");
 4285 
 4286 int
 4287 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
 4288 {
 4289         int i;
 4290         long l;
 4291         size_t s;
 4292         char numbuf[12];
 4293 
 4294         switch (oidp->oid_kind & CTLTYPE)
 4295         {
 4296         case CTLTYPE_LONG:
 4297         case CTLTYPE_ULONG:
 4298                 l = 0;
 4299 #ifdef SCTL_MASK32
 4300                 if (!(req->flags & SCTL_MASK32))
 4301 #endif
 4302                         return (SYSCTL_OUT(req, &l, sizeof(l)));
 4303         case CTLTYPE_INT:
 4304         case CTLTYPE_UINT:
 4305                 i = 0;
 4306                 return (SYSCTL_OUT(req, &i, sizeof(i)));
 4307         case CTLTYPE_STRING:
 4308                 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
 4309                 return
 4310                     (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
 4311         case CTLTYPE_STRUCT:
 4312                 s = (size_t)arg2;
 4313                 return (SYSCTL_OUT(req, &s, sizeof(s)));
 4314         }
 4315         return (0);
 4316 }
 4317 
 4318 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
 4319 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
 4320 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
 4321 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
 4322 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
 4323     "I", "Jail secure level");
 4324 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
 4325     "I", "Jail cannot see all mounted file systems");
 4326 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
 4327     "I", "Ruleset for in-jail devfs mounts");
 4328 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
 4329     "B", "Jail persistence");
 4330 #ifdef VIMAGE
 4331 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
 4332     "E,jailsys", "Virtual network stack");
 4333 #endif
 4334 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
 4335     "B", "Jail is in the process of shutting down");
 4336 
 4337 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
 4338 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
 4339     "I", "Current number of child jails");
 4340 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
 4341     "I", "Maximum number of child jails");
 4342 
 4343 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
 4344 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4345     "Jail hostname");
 4346 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4347     "Jail NIS domainname");
 4348 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
 4349     "Jail host UUID");
 4350 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
 4351     "LU", "Jail host ID");
 4352 
 4353 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
 4354 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
 4355 
 4356 #ifdef INET
 4357 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
 4358     "Jail IPv4 address virtualization");
 4359 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
 4360     "S,in_addr,a", "Jail IPv4 addresses");
 4361 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4362     "B", "Do (not) use IPv4 source address selection rather than the "
 4363     "primary jail IPv4 address.");
 4364 #endif
 4365 #ifdef INET6
 4366 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
 4367     "Jail IPv6 address virtualization");
 4368 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
 4369     "S,in6_addr,a", "Jail IPv6 addresses");
 4370 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4371     "B", "Do (not) use IPv6 source address selection rather than the "
 4372     "primary jail IPv6 address.");
 4373 #endif
 4374 
 4375 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
 4376 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
 4377     "B", "Jail may set hostname");
 4378 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
 4379     "B", "Jail may use SYSV IPC");
 4380 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
 4381     "B", "Jail may create raw sockets");
 4382 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
 4383     "B", "Jail may alter system file flags");
 4384 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
 4385     "B", "Jail may set file quotas");
 4386 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
 4387     "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
 4388 
 4389 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
 4390 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
 4391     "B", "Jail may mount/unmount jail-friendly file systems in general");
 4392 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
 4393     "B", "Jail may mount the devfs file system");
 4394 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
 4395     "B", "Jail may mount the nullfs file system");
 4396 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
 4397     "B", "Jail may mount the procfs file system");
 4398 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
 4399     "B", "Jail may mount the tmpfs file system");
 4400 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
 4401     "B", "Jail may mount the zfs file system");
 4402 
 4403 void
 4404 prison_racct_foreach(void (*callback)(struct racct *racct,
 4405     void *arg2, void *arg3), void *arg2, void *arg3)
 4406 {
 4407         struct prison_racct *prr;
 4408 
 4409         sx_slock(&allprison_lock);
 4410         LIST_FOREACH(prr, &allprison_racct, prr_next)
 4411                 (callback)(prr->prr_racct, arg2, arg3);
 4412         sx_sunlock(&allprison_lock);
 4413 }
 4414 
 4415 static struct prison_racct *
 4416 prison_racct_find_locked(const char *name)
 4417 {
 4418         struct prison_racct *prr;
 4419 
 4420         sx_assert(&allprison_lock, SA_XLOCKED);
 4421 
 4422         if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
 4423                 return (NULL);
 4424 
 4425         LIST_FOREACH(prr, &allprison_racct, prr_next) {
 4426                 if (strcmp(name, prr->prr_name) != 0)
 4427                         continue;
 4428 
 4429                 /* Found prison_racct with a matching name? */
 4430                 prison_racct_hold(prr);
 4431                 return (prr);
 4432         }
 4433 
 4434         /* Add new prison_racct. */
 4435         prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
 4436         racct_create(&prr->prr_racct);
 4437 
 4438         strcpy(prr->prr_name, name);
 4439         refcount_init(&prr->prr_refcount, 1);
 4440         LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
 4441 
 4442         return (prr);
 4443 }
 4444 
 4445 struct prison_racct *
 4446 prison_racct_find(const char *name)
 4447 {
 4448         struct prison_racct *prr;
 4449 
 4450         sx_xlock(&allprison_lock);
 4451         prr = prison_racct_find_locked(name);
 4452         sx_xunlock(&allprison_lock);
 4453         return (prr);
 4454 }
 4455 
 4456 void
 4457 prison_racct_hold(struct prison_racct *prr)
 4458 {
 4459 
 4460         refcount_acquire(&prr->prr_refcount);
 4461 }
 4462 
 4463 static void
 4464 prison_racct_free_locked(struct prison_racct *prr)
 4465 {
 4466 
 4467         sx_assert(&allprison_lock, SA_XLOCKED);
 4468 
 4469         if (refcount_release(&prr->prr_refcount)) {
 4470                 racct_destroy(&prr->prr_racct);
 4471                 LIST_REMOVE(prr, prr_next);
 4472                 free(prr, M_PRISON_RACCT);
 4473         }
 4474 }
 4475 
 4476 void
 4477 prison_racct_free(struct prison_racct *prr)
 4478 {
 4479         int old;
 4480 
 4481         sx_assert(&allprison_lock, SA_UNLOCKED);
 4482 
 4483         old = prr->prr_refcount;
 4484         if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
 4485                 return;
 4486 
 4487         sx_xlock(&allprison_lock);
 4488         prison_racct_free_locked(prr);
 4489         sx_xunlock(&allprison_lock);
 4490 }
 4491 
 4492 #ifdef RACCT
 4493 static void
 4494 prison_racct_attach(struct prison *pr)
 4495 {
 4496         struct prison_racct *prr;
 4497 
 4498         sx_assert(&allprison_lock, SA_XLOCKED);
 4499 
 4500         prr = prison_racct_find_locked(pr->pr_name);
 4501         KASSERT(prr != NULL, ("cannot find prison_racct"));
 4502 
 4503         pr->pr_prison_racct = prr;
 4504 }
 4505 
 4506 /*
 4507  * Handle jail renaming.  From the racct point of view, renaming means
 4508  * moving from one prison_racct to another.
 4509  */
 4510 static void
 4511 prison_racct_modify(struct prison *pr)
 4512 {
 4513         struct proc *p;
 4514         struct ucred *cred;
 4515         struct prison_racct *oldprr;
 4516 
 4517         sx_slock(&allproc_lock);
 4518         sx_xlock(&allprison_lock);
 4519 
 4520         if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
 4521                 sx_xunlock(&allprison_lock);
 4522                 sx_sunlock(&allproc_lock);
 4523                 return;
 4524         }
 4525 
 4526         oldprr = pr->pr_prison_racct;
 4527         pr->pr_prison_racct = NULL;
 4528 
 4529         prison_racct_attach(pr);
 4530 
 4531         /*
 4532          * Move resource utilisation records.
 4533          */
 4534         racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
 4535 
 4536         /*
 4537          * Force rctl to reattach rules to processes.
 4538          */
 4539         FOREACH_PROC_IN_SYSTEM(p) {
 4540                 PROC_LOCK(p);
 4541                 cred = crhold(p->p_ucred);
 4542                 PROC_UNLOCK(p);
 4543                 racct_proc_ucred_changed(p, cred, cred);
 4544                 crfree(cred);
 4545         }
 4546 
 4547         sx_sunlock(&allproc_lock);
 4548         prison_racct_free_locked(oldprr);
 4549         sx_xunlock(&allprison_lock);
 4550 }
 4551 
 4552 static void
 4553 prison_racct_detach(struct prison *pr)
 4554 {
 4555 
 4556         sx_assert(&allprison_lock, SA_UNLOCKED);
 4557 
 4558         if (pr->pr_prison_racct == NULL)
 4559                 return;
 4560         prison_racct_free(pr->pr_prison_racct);
 4561         pr->pr_prison_racct = NULL;
 4562 }
 4563 #endif /* RACCT */
 4564 
 4565 #ifdef DDB
 4566 
 4567 static void
 4568 db_show_prison(struct prison *pr)
 4569 {
 4570         int fi;
 4571 #if defined(INET) || defined(INET6)
 4572         int ii;
 4573 #endif
 4574         unsigned jsf;
 4575 #ifdef INET6
 4576         char ip6buf[INET6_ADDRSTRLEN];
 4577 #endif
 4578 
 4579         db_printf("prison %p:\n", pr);
 4580         db_printf(" jid             = %d\n", pr->pr_id);
 4581         db_printf(" name            = %s\n", pr->pr_name);
 4582         db_printf(" parent          = %p\n", pr->pr_parent);
 4583         db_printf(" ref             = %d\n", pr->pr_ref);
 4584         db_printf(" uref            = %d\n", pr->pr_uref);
 4585         db_printf(" path            = %s\n", pr->pr_path);
 4586         db_printf(" cpuset          = %d\n", pr->pr_cpuset
 4587             ? pr->pr_cpuset->cs_id : -1);
 4588 #ifdef VIMAGE
 4589         db_printf(" vnet            = %p\n", pr->pr_vnet);
 4590 #endif
 4591         db_printf(" root            = %p\n", pr->pr_root);
 4592         db_printf(" securelevel     = %d\n", pr->pr_securelevel);
 4593         db_printf(" devfs_rsnum     = %d\n", pr->pr_devfs_rsnum);
 4594         db_printf(" children.max    = %d\n", pr->pr_childmax);
 4595         db_printf(" children.cur    = %d\n", pr->pr_childcount);
 4596         db_printf(" child           = %p\n", LIST_FIRST(&pr->pr_children));
 4597         db_printf(" sibling         = %p\n", LIST_NEXT(pr, pr_sibling));
 4598         db_printf(" flags           = 0x%x", pr->pr_flags);
 4599         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 4600             fi++)
 4601                 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
 4602                         db_printf(" %s", pr_flag_names[fi]);
 4603         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 4604             fi++) {
 4605                 jsf = pr->pr_flags &
 4606                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 4607                 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
 4608                     pr_flag_jailsys[fi].disable && 
 4609                       (jsf == pr_flag_jailsys[fi].disable) ? "disable"
 4610                     : (jsf == pr_flag_jailsys[fi].new) ? "new"
 4611                     : "inherit");
 4612         }
 4613         db_printf(" allow           = 0x%x", pr->pr_allow);
 4614         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 4615             fi++)
 4616                 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
 4617                         db_printf(" %s", pr_allow_names[fi]);
 4618         db_printf("\n");
 4619         db_printf(" enforce_statfs  = %d\n", pr->pr_enforce_statfs);
 4620         db_printf(" host.hostname   = %s\n", pr->pr_hostname);
 4621         db_printf(" host.domainname = %s\n", pr->pr_domainname);
 4622         db_printf(" host.hostuuid   = %s\n", pr->pr_hostuuid);
 4623         db_printf(" host.hostid     = %lu\n", pr->pr_hostid);
 4624 #ifdef INET
 4625         db_printf(" ip4s            = %d\n", pr->pr_ip4s);
 4626         for (ii = 0; ii < pr->pr_ip4s; ii++)
 4627                 db_printf(" %s %s\n",
 4628                     ii == 0 ? "ip4.addr        =" : "                 ",
 4629                     inet_ntoa(pr->pr_ip4[ii]));
 4630 #endif
 4631 #ifdef INET6
 4632         db_printf(" ip6s            = %d\n", pr->pr_ip6s);
 4633         for (ii = 0; ii < pr->pr_ip6s; ii++)
 4634                 db_printf(" %s %s\n",
 4635                     ii == 0 ? "ip6.addr        =" : "                 ",
 4636                     ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
 4637 #endif
 4638 }
 4639 
 4640 DB_SHOW_COMMAND(prison, db_show_prison_command)
 4641 {
 4642         struct prison *pr;
 4643 
 4644         if (!have_addr) {
 4645                 /*
 4646                  * Show all prisons in the list, and prison0 which is not
 4647                  * listed.
 4648                  */
 4649                 db_show_prison(&prison0);
 4650                 if (!db_pager_quit) {
 4651                         TAILQ_FOREACH(pr, &allprison, pr_list) {
 4652                                 db_show_prison(pr);
 4653                                 if (db_pager_quit)
 4654                                         break;
 4655                         }
 4656                 }
 4657                 return;
 4658         }
 4659 
 4660         if (addr == 0)
 4661                 pr = &prison0;
 4662         else {
 4663                 /* Look for a prison with the ID and with references. */
 4664                 TAILQ_FOREACH(pr, &allprison, pr_list)
 4665                         if (pr->pr_id == addr && pr->pr_ref > 0)
 4666                                 break;
 4667                 if (pr == NULL)
 4668                         /* Look again, without requiring a reference. */
 4669                         TAILQ_FOREACH(pr, &allprison, pr_list)
 4670                                 if (pr->pr_id == addr)
 4671                                         break;
 4672                 if (pr == NULL)
 4673                         /* Assume address points to a valid prison. */
 4674                         pr = (struct prison *)addr;
 4675         }
 4676         db_show_prison(pr);
 4677 }
 4678 
 4679 #endif /* DDB */

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