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: stable/10/sys/kern/kern_jail.c 302234 2016-06-27 21:50:30Z bdrewery $");
   31 
   32 #include "opt_compat.h"
   33 #include "opt_ddb.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/types.h>
   39 #include <sys/kernel.h>
   40 #include <sys/systm.h>
   41 #include <sys/errno.h>
   42 #include <sys/sysproto.h>
   43 #include <sys/malloc.h>
   44 #include <sys/osd.h>
   45 #include <sys/priv.h>
   46 #include <sys/proc.h>
   47 #include <sys/taskqueue.h>
   48 #include <sys/fcntl.h>
   49 #include <sys/jail.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/racct.h>
   53 #include <sys/refcount.h>
   54 #include <sys/sx.h>
   55 #include <sys/sysent.h>
   56 #include <sys/namei.h>
   57 #include <sys/mount.h>
   58 #include <sys/queue.h>
   59 #include <sys/socket.h>
   60 #include <sys/syscallsubr.h>
   61 #include <sys/sysctl.h>
   62 #include <sys/vnode.h>
   63 
   64 #include <net/if.h>
   65 #include <net/vnet.h>
   66 
   67 #include <netinet/in.h>
   68 
   69 #ifdef DDB
   70 #include <ddb/ddb.h>
   71 #ifdef INET6
   72 #include <netinet6/in6_var.h>
   73 #endif /* INET6 */
   74 #endif /* DDB */
   75 
   76 #include <security/mac/mac_framework.h>
   77 
   78 #define DEFAULT_HOSTUUID        "00000000-0000-0000-0000-000000000000"
   79 
   80 MALLOC_DEFINE(M_PRISON, "prison", "Prison structures");
   81 static MALLOC_DEFINE(M_PRISON_RACCT, "prison_racct", "Prison racct structures");
   82 
   83 /* Keep struct prison prison0 and some code in kern_jail_set() readable. */
   84 #ifdef INET
   85 #ifdef INET6
   86 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL|PR_IP6_SADDRSEL
   87 #else
   88 #define _PR_IP_SADDRSEL PR_IP4_SADDRSEL
   89 #endif
   90 #else /* !INET */
   91 #ifdef INET6
   92 #define _PR_IP_SADDRSEL PR_IP6_SADDRSEL
   93 #else
   94 #define _PR_IP_SADDRSEL 0
   95 #endif
   96 #endif
   97 
   98 /* prison0 describes what is "real" about the system. */
   99 struct prison prison0 = {
  100         .pr_id          = 0,
  101         .pr_name        = "",
  102         .pr_ref         = 1,
  103         .pr_uref        = 1,
  104         .pr_path        = "/",
  105         .pr_securelevel = -1,
  106         .pr_devfs_rsnum = 0,
  107         .pr_childmax    = JAIL_MAX,
  108         .pr_hostuuid    = DEFAULT_HOSTUUID,
  109         .pr_children    = LIST_HEAD_INITIALIZER(prison0.pr_children),
  110 #ifdef VIMAGE
  111         .pr_flags       = PR_HOST|PR_VNET|_PR_IP_SADDRSEL,
  112 #else
  113         .pr_flags       = PR_HOST|_PR_IP_SADDRSEL,
  114 #endif
  115         .pr_allow       = PR_ALLOW_ALL,
  116 };
  117 MTX_SYSINIT(prison0, &prison0.pr_mtx, "jail mutex", MTX_DEF);
  118 
  119 /* allprison, allprison_racct and lastprid are protected by allprison_lock. */
  120 struct  sx allprison_lock;
  121 SX_SYSINIT(allprison_lock, &allprison_lock, "allprison");
  122 struct  prisonlist allprison = TAILQ_HEAD_INITIALIZER(allprison);
  123 LIST_HEAD(, prison_racct) allprison_racct;
  124 int     lastprid = 0;
  125 
  126 static int do_jail_attach(struct thread *td, struct prison *pr);
  127 static void prison_complete(void *context, int pending);
  128 static void prison_deref(struct prison *pr, int flags);
  129 static char *prison_path(struct prison *pr1, struct prison *pr2);
  130 static void prison_remove_one(struct prison *pr);
  131 #ifdef RACCT
  132 static void prison_racct_attach(struct prison *pr);
  133 static void prison_racct_modify(struct prison *pr);
  134 static void prison_racct_detach(struct prison *pr);
  135 #endif
  136 #ifdef INET
  137 static int _prison_check_ip4(struct prison *pr, struct in_addr *ia);
  138 static int prison_restrict_ip4(struct prison *pr, struct in_addr *newip4);
  139 #endif
  140 #ifdef INET6
  141 static int _prison_check_ip6(struct prison *pr, struct in6_addr *ia6);
  142 static int prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6);
  143 #endif
  144 
  145 /* Flags for prison_deref */
  146 #define PD_DEREF        0x01
  147 #define PD_DEUREF       0x02
  148 #define PD_LOCKED       0x04
  149 #define PD_LIST_SLOCKED 0x08
  150 #define PD_LIST_XLOCKED 0x10
  151 
  152 /*
  153  * Parameter names corresponding to PR_* flag values.  Size values are for kvm
  154  * as we cannot figure out the size of a sparse array, or an array without a
  155  * terminating entry.
  156  */
  157 static char *pr_flag_names[] = {
  158         [0] = "persist",
  159 #ifdef INET
  160         [7] = "ip4.saddrsel",
  161 #endif
  162 #ifdef INET6
  163         [8] = "ip6.saddrsel",
  164 #endif
  165 };
  166 const size_t pr_flag_names_size = sizeof(pr_flag_names);
  167 
  168 static char *pr_flag_nonames[] = {
  169         [0] = "nopersist",
  170 #ifdef INET
  171         [7] = "ip4.nosaddrsel",
  172 #endif
  173 #ifdef INET6
  174         [8] = "ip6.nosaddrsel",
  175 #endif
  176 };
  177 const size_t pr_flag_nonames_size = sizeof(pr_flag_nonames);
  178 
  179 struct jailsys_flags {
  180         const char      *name;
  181         unsigned         disable;
  182         unsigned         new;
  183 } pr_flag_jailsys[] = {
  184         { "host", 0, PR_HOST },
  185 #ifdef VIMAGE
  186         { "vnet", 0, PR_VNET },
  187 #endif
  188 #ifdef INET
  189         { "ip4", PR_IP4_USER | PR_IP4_DISABLE, PR_IP4_USER },
  190 #endif
  191 #ifdef INET6
  192         { "ip6", PR_IP6_USER | PR_IP6_DISABLE, PR_IP6_USER },
  193 #endif
  194 };
  195 const size_t pr_flag_jailsys_size = sizeof(pr_flag_jailsys);
  196 
  197 static char *pr_allow_names[] = {
  198         "allow.set_hostname",
  199         "allow.sysvipc",
  200         "allow.raw_sockets",
  201         "allow.chflags",
  202         "allow.mount",
  203         "allow.quotas",
  204         "allow.socket_af",
  205         "allow.mount.devfs",
  206         "allow.mount.nullfs",
  207         "allow.mount.zfs",
  208         "allow.mount.procfs",
  209         "allow.mount.tmpfs",
  210         "allow.mount.fdescfs",
  211         "allow.mount.linprocfs",
  212         "allow.mount.linsysfs",
  213 };
  214 const size_t pr_allow_names_size = sizeof(pr_allow_names);
  215 
  216 static char *pr_allow_nonames[] = {
  217         "allow.noset_hostname",
  218         "allow.nosysvipc",
  219         "allow.noraw_sockets",
  220         "allow.nochflags",
  221         "allow.nomount",
  222         "allow.noquotas",
  223         "allow.nosocket_af",
  224         "allow.mount.nodevfs",
  225         "allow.mount.nonullfs",
  226         "allow.mount.nozfs",
  227         "allow.mount.noprocfs",
  228         "allow.mount.notmpfs",
  229         "allow.mount.nofdescfs",
  230         "allow.mount.nolinprocfs",
  231         "allow.mount.nolinsysfs",
  232 };
  233 const size_t pr_allow_nonames_size = sizeof(pr_allow_nonames);
  234 
  235 #define JAIL_DEFAULT_ALLOW              PR_ALLOW_SET_HOSTNAME
  236 #define JAIL_DEFAULT_ENFORCE_STATFS     2
  237 #define JAIL_DEFAULT_DEVFS_RSNUM        0
  238 static unsigned jail_default_allow = JAIL_DEFAULT_ALLOW;
  239 static int jail_default_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
  240 static int jail_default_devfs_rsnum = JAIL_DEFAULT_DEVFS_RSNUM;
  241 #if defined(INET) || defined(INET6)
  242 static unsigned jail_max_af_ips = 255;
  243 #endif
  244 
  245 /*
  246  * Initialize the parts of prison0 that can't be static-initialized with
  247  * constants.  This is called from proc0_init() after creating thread0 cpuset.
  248  */
  249 void
  250 prison0_init(void)
  251 {
  252 
  253         prison0.pr_cpuset = cpuset_ref(thread0.td_cpuset);
  254         prison0.pr_osreldate = osreldate;
  255         strlcpy(prison0.pr_osrelease, osrelease, sizeof(prison0.pr_osrelease));
  256 }
  257 
  258 #ifdef INET
  259 static int
  260 qcmp_v4(const void *ip1, const void *ip2)
  261 {
  262         in_addr_t iaa, iab;
  263 
  264         /*
  265          * We need to compare in HBO here to get the list sorted as expected
  266          * by the result of the code.  Sorting NBO addresses gives you
  267          * interesting results.  If you do not understand, do not try.
  268          */
  269         iaa = ntohl(((const struct in_addr *)ip1)->s_addr);
  270         iab = ntohl(((const struct in_addr *)ip2)->s_addr);
  271 
  272         /*
  273          * Do not simply return the difference of the two numbers, the int is
  274          * not wide enough.
  275          */
  276         if (iaa > iab)
  277                 return (1);
  278         else if (iaa < iab)
  279                 return (-1);
  280         else
  281                 return (0);
  282 }
  283 #endif
  284 
  285 #ifdef INET6
  286 static int
  287 qcmp_v6(const void *ip1, const void *ip2)
  288 {
  289         const struct in6_addr *ia6a, *ia6b;
  290         int i, rc;
  291 
  292         ia6a = (const struct in6_addr *)ip1;
  293         ia6b = (const struct in6_addr *)ip2;
  294 
  295         rc = 0;
  296         for (i = 0; rc == 0 && i < sizeof(struct in6_addr); i++) {
  297                 if (ia6a->s6_addr[i] > ia6b->s6_addr[i])
  298                         rc = 1;
  299                 else if (ia6a->s6_addr[i] < ia6b->s6_addr[i])
  300                         rc = -1;
  301         }
  302         return (rc);
  303 }
  304 #endif
  305 
  306 /*
  307  * struct jail_args {
  308  *      struct jail *jail;
  309  * };
  310  */
  311 int
  312 sys_jail(struct thread *td, struct jail_args *uap)
  313 {
  314         uint32_t version;
  315         int error;
  316         struct jail j;
  317 
  318         error = copyin(uap->jail, &version, sizeof(uint32_t));
  319         if (error)
  320                 return (error);
  321 
  322         switch (version) {
  323         case 0:
  324         {
  325                 struct jail_v0 j0;
  326 
  327                 /* FreeBSD single IPv4 jails. */
  328                 bzero(&j, sizeof(struct jail));
  329                 error = copyin(uap->jail, &j0, sizeof(struct jail_v0));
  330                 if (error)
  331                         return (error);
  332                 j.version = j0.version;
  333                 j.path = j0.path;
  334                 j.hostname = j0.hostname;
  335                 j.ip4s = htonl(j0.ip_number);   /* jail_v0 is host order */
  336                 break;
  337         }
  338 
  339         case 1:
  340                 /*
  341                  * Version 1 was used by multi-IPv4 jail implementations
  342                  * that never made it into the official kernel.
  343                  */
  344                 return (EINVAL);
  345 
  346         case 2: /* JAIL_API_VERSION */
  347                 /* FreeBSD multi-IPv4/IPv6,noIP jails. */
  348                 error = copyin(uap->jail, &j, sizeof(struct jail));
  349                 if (error)
  350                         return (error);
  351                 break;
  352 
  353         default:
  354                 /* Sci-Fi jails are not supported, sorry. */
  355                 return (EINVAL);
  356         }
  357         return (kern_jail(td, &j));
  358 }
  359 
  360 int
  361 kern_jail(struct thread *td, struct jail *j)
  362 {
  363         struct iovec optiov[2 * (4
  364                             + sizeof(pr_allow_names) / sizeof(pr_allow_names[0])
  365 #ifdef INET
  366                             + 1
  367 #endif
  368 #ifdef INET6
  369                             + 1
  370 #endif
  371                             )];
  372         struct uio opt;
  373         char *u_path, *u_hostname, *u_name;
  374 #ifdef INET
  375         uint32_t ip4s;
  376         struct in_addr *u_ip4;
  377 #endif
  378 #ifdef INET6
  379         struct in6_addr *u_ip6;
  380 #endif
  381         size_t tmplen;
  382         int error, enforce_statfs, fi;
  383 
  384         bzero(&optiov, sizeof(optiov));
  385         opt.uio_iov = optiov;
  386         opt.uio_iovcnt = 0;
  387         opt.uio_offset = -1;
  388         opt.uio_resid = -1;
  389         opt.uio_segflg = UIO_SYSSPACE;
  390         opt.uio_rw = UIO_READ;
  391         opt.uio_td = td;
  392 
  393         /* Set permissions for top-level jails from sysctls. */
  394         if (!jailed(td->td_ucred)) {
  395                 for (fi = 0; fi < sizeof(pr_allow_names) /
  396                      sizeof(pr_allow_names[0]); fi++) {
  397                         optiov[opt.uio_iovcnt].iov_base =
  398                             (jail_default_allow & (1 << fi))
  399                             ? pr_allow_names[fi] : pr_allow_nonames[fi];
  400                         optiov[opt.uio_iovcnt].iov_len =
  401                             strlen(optiov[opt.uio_iovcnt].iov_base) + 1;
  402                         opt.uio_iovcnt += 2;
  403                 }
  404                 optiov[opt.uio_iovcnt].iov_base = "enforce_statfs";
  405                 optiov[opt.uio_iovcnt].iov_len = sizeof("enforce_statfs");
  406                 opt.uio_iovcnt++;
  407                 enforce_statfs = jail_default_enforce_statfs;
  408                 optiov[opt.uio_iovcnt].iov_base = &enforce_statfs;
  409                 optiov[opt.uio_iovcnt].iov_len = sizeof(enforce_statfs);
  410                 opt.uio_iovcnt++;
  411         }
  412 
  413         tmplen = MAXPATHLEN + MAXHOSTNAMELEN + MAXHOSTNAMELEN;
  414 #ifdef INET
  415         ip4s = (j->version == 0) ? 1 : j->ip4s;
  416         if (ip4s > jail_max_af_ips)
  417                 return (EINVAL);
  418         tmplen += ip4s * sizeof(struct in_addr);
  419 #else
  420         if (j->ip4s > 0)
  421                 return (EINVAL);
  422 #endif
  423 #ifdef INET6
  424         if (j->ip6s > jail_max_af_ips)
  425                 return (EINVAL);
  426         tmplen += j->ip6s * sizeof(struct in6_addr);
  427 #else
  428         if (j->ip6s > 0)
  429                 return (EINVAL);
  430 #endif
  431         u_path = malloc(tmplen, M_TEMP, M_WAITOK);
  432         u_hostname = u_path + MAXPATHLEN;
  433         u_name = u_hostname + MAXHOSTNAMELEN;
  434 #ifdef INET
  435         u_ip4 = (struct in_addr *)(u_name + MAXHOSTNAMELEN);
  436 #endif
  437 #ifdef INET6
  438 #ifdef INET
  439         u_ip6 = (struct in6_addr *)(u_ip4 + ip4s);
  440 #else
  441         u_ip6 = (struct in6_addr *)(u_name + MAXHOSTNAMELEN);
  442 #endif
  443 #endif
  444         optiov[opt.uio_iovcnt].iov_base = "path";
  445         optiov[opt.uio_iovcnt].iov_len = sizeof("path");
  446         opt.uio_iovcnt++;
  447         optiov[opt.uio_iovcnt].iov_base = u_path;
  448         error = copyinstr(j->path, u_path, MAXPATHLEN,
  449             &optiov[opt.uio_iovcnt].iov_len);
  450         if (error) {
  451                 free(u_path, M_TEMP);
  452                 return (error);
  453         }
  454         opt.uio_iovcnt++;
  455         optiov[opt.uio_iovcnt].iov_base = "host.hostname";
  456         optiov[opt.uio_iovcnt].iov_len = sizeof("host.hostname");
  457         opt.uio_iovcnt++;
  458         optiov[opt.uio_iovcnt].iov_base = u_hostname;
  459         error = copyinstr(j->hostname, u_hostname, MAXHOSTNAMELEN,
  460             &optiov[opt.uio_iovcnt].iov_len);
  461         if (error) {
  462                 free(u_path, M_TEMP);
  463                 return (error);
  464         }
  465         opt.uio_iovcnt++;
  466         if (j->jailname != NULL) {
  467                 optiov[opt.uio_iovcnt].iov_base = "name";
  468                 optiov[opt.uio_iovcnt].iov_len = sizeof("name");
  469                 opt.uio_iovcnt++;
  470                 optiov[opt.uio_iovcnt].iov_base = u_name;
  471                 error = copyinstr(j->jailname, u_name, MAXHOSTNAMELEN,
  472                     &optiov[opt.uio_iovcnt].iov_len);
  473                 if (error) {
  474                         free(u_path, M_TEMP);
  475                         return (error);
  476                 }
  477                 opt.uio_iovcnt++;
  478         }
  479 #ifdef INET
  480         optiov[opt.uio_iovcnt].iov_base = "ip4.addr";
  481         optiov[opt.uio_iovcnt].iov_len = sizeof("ip4.addr");
  482         opt.uio_iovcnt++;
  483         optiov[opt.uio_iovcnt].iov_base = u_ip4;
  484         optiov[opt.uio_iovcnt].iov_len = ip4s * sizeof(struct in_addr);
  485         if (j->version == 0)
  486                 u_ip4->s_addr = j->ip4s;
  487         else {
  488                 error = copyin(j->ip4, u_ip4, optiov[opt.uio_iovcnt].iov_len);
  489                 if (error) {
  490                         free(u_path, M_TEMP);
  491                         return (error);
  492                 }
  493         }
  494         opt.uio_iovcnt++;
  495 #endif
  496 #ifdef INET6
  497         optiov[opt.uio_iovcnt].iov_base = "ip6.addr";
  498         optiov[opt.uio_iovcnt].iov_len = sizeof("ip6.addr");
  499         opt.uio_iovcnt++;
  500         optiov[opt.uio_iovcnt].iov_base = u_ip6;
  501         optiov[opt.uio_iovcnt].iov_len = j->ip6s * sizeof(struct in6_addr);
  502         error = copyin(j->ip6, u_ip6, optiov[opt.uio_iovcnt].iov_len);
  503         if (error) {
  504                 free(u_path, M_TEMP);
  505                 return (error);
  506         }
  507         opt.uio_iovcnt++;
  508 #endif
  509         KASSERT(opt.uio_iovcnt <= sizeof(optiov) / sizeof(optiov[0]),
  510             ("kern_jail: too many iovecs (%d)", opt.uio_iovcnt));
  511         error = kern_jail_set(td, &opt, JAIL_CREATE | JAIL_ATTACH);
  512         free(u_path, M_TEMP);
  513         return (error);
  514 }
  515 
  516 
  517 /*
  518  * struct jail_set_args {
  519  *      struct iovec *iovp;
  520  *      unsigned int iovcnt;
  521  *      int flags;
  522  * };
  523  */
  524 int
  525 sys_jail_set(struct thread *td, struct jail_set_args *uap)
  526 {
  527         struct uio *auio;
  528         int error;
  529 
  530         /* Check that we have an even number of iovecs. */
  531         if (uap->iovcnt & 1)
  532                 return (EINVAL);
  533 
  534         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
  535         if (error)
  536                 return (error);
  537         error = kern_jail_set(td, auio, uap->flags);
  538         free(auio, M_IOV);
  539         return (error);
  540 }
  541 
  542 int
  543 kern_jail_set(struct thread *td, struct uio *optuio, int flags)
  544 {
  545         struct nameidata nd;
  546 #ifdef INET
  547         struct in_addr *ip4;
  548 #endif
  549 #ifdef INET6
  550         struct in6_addr *ip6;
  551 #endif
  552         struct vfsopt *opt;
  553         struct vfsoptlist *opts;
  554         struct prison *pr, *deadpr, *mypr, *ppr, *tpr;
  555         struct vnode *root;
  556         char *domain, *errmsg, *host, *name, *namelc, *p, *path, *uuid;
  557         char *g_path, *osrelstr;
  558 #if defined(INET) || defined(INET6)
  559         struct prison *tppr;
  560         void *op;
  561 #endif
  562         unsigned long hid;
  563         size_t namelen, onamelen, pnamelen;
  564         int born, created, cuflags, descend, enforce;
  565         int error, errmsg_len, errmsg_pos;
  566         int gotchildmax, gotenforce, gothid, gotrsnum, gotslevel;
  567         int fi, jid, jsys, len, level;
  568         int childmax, osreldt, rsnum, slevel;
  569         int fullpath_disabled;
  570 #if defined(INET) || defined(INET6)
  571         int ii, ij;
  572 #endif
  573 #ifdef INET
  574         int ip4s, redo_ip4;
  575 #endif
  576 #ifdef INET6
  577         int ip6s, redo_ip6;
  578 #endif
  579         uint64_t pr_allow, ch_allow, pr_flags, ch_flags;
  580         unsigned tallow;
  581         char numbuf[12];
  582 
  583         error = priv_check(td, PRIV_JAIL_SET);
  584         if (!error && (flags & JAIL_ATTACH))
  585                 error = priv_check(td, PRIV_JAIL_ATTACH);
  586         if (error)
  587                 return (error);
  588         mypr = td->td_ucred->cr_prison;
  589         if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0)
  590                 return (EPERM);
  591         if (flags & ~JAIL_SET_MASK)
  592                 return (EINVAL);
  593 
  594         /*
  595          * Check all the parameters before committing to anything.  Not all
  596          * errors can be caught early, but we may as well try.  Also, this
  597          * takes care of some expensive stuff (path lookup) before getting
  598          * the allprison lock.
  599          *
  600          * XXX Jails are not filesystems, and jail parameters are not mount
  601          *     options.  But it makes more sense to re-use the vfsopt code
  602          *     than duplicate it under a different name.
  603          */
  604         error = vfs_buildopts(optuio, &opts);
  605         if (error)
  606                 return (error);
  607 #ifdef INET
  608         ip4 = NULL;
  609 #endif
  610 #ifdef INET6
  611         ip6 = NULL;
  612 #endif
  613         g_path = NULL;
  614 
  615         cuflags = flags & (JAIL_CREATE | JAIL_UPDATE);
  616         if (!cuflags) {
  617                 error = EINVAL;
  618                 vfs_opterror(opts, "no valid operation (create or update)");
  619                 goto done_errmsg;
  620         }
  621 
  622         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
  623         if (error == ENOENT)
  624                 jid = 0;
  625         else if (error != 0)
  626                 goto done_free;
  627 
  628         error = vfs_copyopt(opts, "securelevel", &slevel, sizeof(slevel));
  629         if (error == ENOENT)
  630                 gotslevel = 0;
  631         else if (error != 0)
  632                 goto done_free;
  633         else
  634                 gotslevel = 1;
  635 
  636         error =
  637             vfs_copyopt(opts, "children.max", &childmax, sizeof(childmax));
  638         if (error == ENOENT)
  639                 gotchildmax = 0;
  640         else if (error != 0)
  641                 goto done_free;
  642         else
  643                 gotchildmax = 1;
  644 
  645         error = vfs_copyopt(opts, "enforce_statfs", &enforce, sizeof(enforce));
  646         if (error == ENOENT)
  647                 gotenforce = 0;
  648         else if (error != 0)
  649                 goto done_free;
  650         else if (enforce < 0 || enforce > 2) {
  651                 error = EINVAL;
  652                 goto done_free;
  653         } else
  654                 gotenforce = 1;
  655 
  656         error = vfs_copyopt(opts, "devfs_ruleset", &rsnum, sizeof(rsnum));
  657         if (error == ENOENT)
  658                 gotrsnum = 0;
  659         else if (error != 0)
  660                 goto done_free;
  661         else
  662                 gotrsnum = 1;
  663 
  664         pr_flags = ch_flags = 0;
  665         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
  666             fi++) {
  667                 if (pr_flag_names[fi] == NULL)
  668                         continue;
  669                 vfs_flagopt(opts, pr_flag_names[fi], &pr_flags, 1 << fi);
  670                 vfs_flagopt(opts, pr_flag_nonames[fi], &ch_flags, 1 << fi);
  671         }
  672         ch_flags |= pr_flags;
  673         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
  674             fi++) {
  675                 error = vfs_copyopt(opts, pr_flag_jailsys[fi].name, &jsys,
  676                     sizeof(jsys));
  677                 if (error == ENOENT)
  678                         continue;
  679                 if (error != 0)
  680                         goto done_free;
  681                 switch (jsys) {
  682                 case JAIL_SYS_DISABLE:
  683                         if (!pr_flag_jailsys[fi].disable) {
  684                                 error = EINVAL;
  685                                 goto done_free;
  686                         }
  687                         pr_flags |= pr_flag_jailsys[fi].disable;
  688                         break;
  689                 case JAIL_SYS_NEW:
  690                         pr_flags |= pr_flag_jailsys[fi].new;
  691                         break;
  692                 case JAIL_SYS_INHERIT:
  693                         break;
  694                 default:
  695                         error = EINVAL;
  696                         goto done_free;
  697                 }
  698                 ch_flags |=
  699                     pr_flag_jailsys[fi].new | pr_flag_jailsys[fi].disable;
  700         }
  701         if ((flags & (JAIL_CREATE | JAIL_UPDATE | JAIL_ATTACH)) == JAIL_CREATE
  702             && !(pr_flags & PR_PERSIST)) {
  703                 error = EINVAL;
  704                 vfs_opterror(opts, "new jail must persist or attach");
  705                 goto done_errmsg;
  706         }
  707 #ifdef VIMAGE
  708         if ((flags & JAIL_UPDATE) && (ch_flags & PR_VNET)) {
  709                 error = EINVAL;
  710                 vfs_opterror(opts, "vnet cannot be changed after creation");
  711                 goto done_errmsg;
  712         }
  713 #endif
  714 #ifdef INET
  715         if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP4_USER)) {
  716                 error = EINVAL;
  717                 vfs_opterror(opts, "ip4 cannot be changed after creation");
  718                 goto done_errmsg;
  719         }
  720 #endif
  721 #ifdef INET6
  722         if ((flags & JAIL_UPDATE) && (ch_flags & PR_IP6_USER)) {
  723                 error = EINVAL;
  724                 vfs_opterror(opts, "ip6 cannot be changed after creation");
  725                 goto done_errmsg;
  726         }
  727 #endif
  728 
  729         pr_allow = ch_allow = 0;
  730         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
  731             fi++) {
  732                 vfs_flagopt(opts, pr_allow_names[fi], &pr_allow, 1 << fi);
  733                 vfs_flagopt(opts, pr_allow_nonames[fi], &ch_allow, 1 << fi);
  734         }
  735         ch_allow |= pr_allow;
  736 
  737         error = vfs_getopt(opts, "name", (void **)&name, &len);
  738         if (error == ENOENT)
  739                 name = NULL;
  740         else if (error != 0)
  741                 goto done_free;
  742         else {
  743                 if (len == 0 || name[len - 1] != '\0') {
  744                         error = EINVAL;
  745                         goto done_free;
  746                 }
  747                 if (len > MAXHOSTNAMELEN) {
  748                         error = ENAMETOOLONG;
  749                         goto done_free;
  750                 }
  751         }
  752 
  753         error = vfs_getopt(opts, "host.hostname", (void **)&host, &len);
  754         if (error == ENOENT)
  755                 host = NULL;
  756         else if (error != 0)
  757                 goto done_free;
  758         else {
  759                 ch_flags |= PR_HOST;
  760                 pr_flags |= PR_HOST;
  761                 if (len == 0 || host[len - 1] != '\0') {
  762                         error = EINVAL;
  763                         goto done_free;
  764                 }
  765                 if (len > MAXHOSTNAMELEN) {
  766                         error = ENAMETOOLONG;
  767                         goto done_free;
  768                 }
  769         }
  770 
  771         error = vfs_getopt(opts, "host.domainname", (void **)&domain, &len);
  772         if (error == ENOENT)
  773                 domain = NULL;
  774         else if (error != 0)
  775                 goto done_free;
  776         else {
  777                 ch_flags |= PR_HOST;
  778                 pr_flags |= PR_HOST;
  779                 if (len == 0 || domain[len - 1] != '\0') {
  780                         error = EINVAL;
  781                         goto done_free;
  782                 }
  783                 if (len > MAXHOSTNAMELEN) {
  784                         error = ENAMETOOLONG;
  785                         goto done_free;
  786                 }
  787         }
  788 
  789         error = vfs_getopt(opts, "host.hostuuid", (void **)&uuid, &len);
  790         if (error == ENOENT)
  791                 uuid = NULL;
  792         else if (error != 0)
  793                 goto done_free;
  794         else {
  795                 ch_flags |= PR_HOST;
  796                 pr_flags |= PR_HOST;
  797                 if (len == 0 || uuid[len - 1] != '\0') {
  798                         error = EINVAL;
  799                         goto done_free;
  800                 }
  801                 if (len > HOSTUUIDLEN) {
  802                         error = ENAMETOOLONG;
  803                         goto done_free;
  804                 }
  805         }
  806 
  807 #ifdef COMPAT_FREEBSD32
  808         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
  809                 uint32_t hid32;
  810 
  811                 error = vfs_copyopt(opts, "host.hostid", &hid32, sizeof(hid32));
  812                 hid = hid32;
  813         } else
  814 #endif
  815                 error = vfs_copyopt(opts, "host.hostid", &hid, sizeof(hid));
  816         if (error == ENOENT)
  817                 gothid = 0;
  818         else if (error != 0)
  819                 goto done_free;
  820         else {
  821                 gothid = 1;
  822                 ch_flags |= PR_HOST;
  823                 pr_flags |= PR_HOST;
  824         }
  825 
  826 #ifdef INET
  827         error = vfs_getopt(opts, "ip4.addr", &op, &ip4s);
  828         if (error == ENOENT)
  829                 ip4s = 0;
  830         else if (error != 0)
  831                 goto done_free;
  832         else if (ip4s & (sizeof(*ip4) - 1)) {
  833                 error = EINVAL;
  834                 goto done_free;
  835         } else {
  836                 ch_flags |= PR_IP4_USER | PR_IP4_DISABLE;
  837                 if (ip4s == 0)
  838                         pr_flags |= PR_IP4_USER | PR_IP4_DISABLE;
  839                 else {
  840                         pr_flags = (pr_flags & ~PR_IP4_DISABLE) | PR_IP4_USER;
  841                         ip4s /= sizeof(*ip4);
  842                         if (ip4s > jail_max_af_ips) {
  843                                 error = EINVAL;
  844                                 vfs_opterror(opts, "too many IPv4 addresses");
  845                                 goto done_errmsg;
  846                         }
  847                         ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
  848                         bcopy(op, ip4, ip4s * sizeof(*ip4));
  849                         /*
  850                          * IP addresses are all sorted but ip[0] to preserve
  851                          * the primary IP address as given from userland.
  852                          * This special IP is used for unbound outgoing
  853                          * connections as well for "loopback" traffic in case
  854                          * source address selection cannot find any more fitting
  855                          * address to connect from.
  856                          */
  857                         if (ip4s > 1)
  858                                 qsort(ip4 + 1, ip4s - 1, sizeof(*ip4), qcmp_v4);
  859                         /*
  860                          * Check for duplicate addresses and do some simple
  861                          * zero and broadcast checks. If users give other bogus
  862                          * addresses it is their problem.
  863                          *
  864                          * We do not have to care about byte order for these
  865                          * checks so we will do them in NBO.
  866                          */
  867                         for (ii = 0; ii < ip4s; ii++) {
  868                                 if (ip4[ii].s_addr == INADDR_ANY ||
  869                                     ip4[ii].s_addr == INADDR_BROADCAST) {
  870                                         error = EINVAL;
  871                                         goto done_free;
  872                                 }
  873                                 if ((ii+1) < ip4s &&
  874                                     (ip4[0].s_addr == ip4[ii+1].s_addr ||
  875                                      ip4[ii].s_addr == ip4[ii+1].s_addr)) {
  876                                         error = EINVAL;
  877                                         goto done_free;
  878                                 }
  879                         }
  880                 }
  881         }
  882 #endif
  883 
  884 #ifdef INET6
  885         error = vfs_getopt(opts, "ip6.addr", &op, &ip6s);
  886         if (error == ENOENT)
  887                 ip6s = 0;
  888         else if (error != 0)
  889                 goto done_free;
  890         else if (ip6s & (sizeof(*ip6) - 1)) {
  891                 error = EINVAL;
  892                 goto done_free;
  893         } else {
  894                 ch_flags |= PR_IP6_USER | PR_IP6_DISABLE;
  895                 if (ip6s == 0)
  896                         pr_flags |= PR_IP6_USER | PR_IP6_DISABLE;
  897                 else {
  898                         pr_flags = (pr_flags & ~PR_IP6_DISABLE) | PR_IP6_USER;
  899                         ip6s /= sizeof(*ip6);
  900                         if (ip6s > jail_max_af_ips) {
  901                                 error = EINVAL;
  902                                 vfs_opterror(opts, "too many IPv6 addresses");
  903                                 goto done_errmsg;
  904                         }
  905                         ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
  906                         bcopy(op, ip6, ip6s * sizeof(*ip6));
  907                         if (ip6s > 1)
  908                                 qsort(ip6 + 1, ip6s - 1, sizeof(*ip6), qcmp_v6);
  909                         for (ii = 0; ii < ip6s; ii++) {
  910                                 if (IN6_IS_ADDR_UNSPECIFIED(&ip6[ii])) {
  911                                         error = EINVAL;
  912                                         goto done_free;
  913                                 }
  914                                 if ((ii+1) < ip6s &&
  915                                     (IN6_ARE_ADDR_EQUAL(&ip6[0], &ip6[ii+1]) ||
  916                                      IN6_ARE_ADDR_EQUAL(&ip6[ii], &ip6[ii+1])))
  917                                 {
  918                                         error = EINVAL;
  919                                         goto done_free;
  920                                 }
  921                         }
  922                 }
  923         }
  924 #endif
  925 
  926 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
  927         if ((ch_flags & PR_VNET) && (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
  928                 error = EINVAL;
  929                 vfs_opterror(opts,
  930                     "vnet jails cannot have IP address restrictions");
  931                 goto done_errmsg;
  932         }
  933 #endif
  934 
  935         error = vfs_getopt(opts, "osrelease", (void **)&osrelstr, &len);
  936         if (error == ENOENT)
  937                 osrelstr = NULL;
  938         else if (error != 0)
  939                 goto done_free;
  940         else {
  941                 if (flags & JAIL_UPDATE) {
  942                         error = EINVAL;
  943                         vfs_opterror(opts,
  944                             "osrelease cannot be changed after creation");
  945                         goto done_errmsg;
  946                 }
  947                 if (len == 0 || len >= OSRELEASELEN) {
  948                         error = EINVAL;
  949                         vfs_opterror(opts,
  950                             "osrelease string must be 1-%d bytes long",
  951                             OSRELEASELEN - 1);
  952                         goto done_errmsg;
  953                 }
  954         }
  955 
  956         error = vfs_copyopt(opts, "osreldate", &osreldt, sizeof(osreldt));
  957         if (error == ENOENT)
  958                 osreldt = 0;
  959         else if (error != 0)
  960                 goto done_free;
  961         else {
  962                 if (flags & JAIL_UPDATE) {
  963                         error = EINVAL;
  964                         vfs_opterror(opts,
  965                             "osreldate cannot be changed after creation");
  966                         goto done_errmsg;
  967                 }
  968                 if (osreldt == 0) {
  969                         error = EINVAL;
  970                         vfs_opterror(opts, "osreldate cannot be 0");
  971                         goto done_errmsg;
  972                 }
  973         }
  974 
  975         fullpath_disabled = 0;
  976         root = NULL;
  977         error = vfs_getopt(opts, "path", (void **)&path, &len);
  978         if (error == ENOENT)
  979                 path = NULL;
  980         else if (error != 0)
  981                 goto done_free;
  982         else {
  983                 if (flags & JAIL_UPDATE) {
  984                         error = EINVAL;
  985                         vfs_opterror(opts,
  986                             "path cannot be changed after creation");
  987                         goto done_errmsg;
  988                 }
  989                 if (len == 0 || path[len - 1] != '\0') {
  990                         error = EINVAL;
  991                         goto done_free;
  992                 }
  993                 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
  994                     path, td);
  995                 error = namei(&nd);
  996                 if (error)
  997                         goto done_free;
  998                 root = nd.ni_vp;
  999                 NDFREE(&nd, NDF_ONLY_PNBUF);
 1000                 g_path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
 1001                 strlcpy(g_path, path, MAXPATHLEN);
 1002                 error = vn_path_to_global_path(td, root, g_path, MAXPATHLEN);
 1003                 if (error == 0)
 1004                         path = g_path;
 1005                 else if (error == ENODEV) {
 1006                         /* proceed if sysctl debug.disablefullpath == 1 */
 1007                         fullpath_disabled = 1;
 1008                         if (len < 2 || (len == 2 && path[0] == '/'))
 1009                                 path = NULL;
 1010                 } else {
 1011                         /* exit on other errors */
 1012                         goto done_free;
 1013                 }
 1014                 if (root->v_type != VDIR) {
 1015                         error = ENOTDIR;
 1016                         vput(root);
 1017                         goto done_free;
 1018                 }
 1019                 VOP_UNLOCK(root, 0);
 1020                 if (fullpath_disabled) {
 1021                         /* Leave room for a real-root full pathname. */
 1022                         if (len + (path[0] == '/' && strcmp(mypr->pr_path, "/")
 1023                             ? strlen(mypr->pr_path) : 0) > MAXPATHLEN) {
 1024                                 error = ENAMETOOLONG;
 1025                                 vrele(root);
 1026                                 goto done_free;
 1027                         }
 1028                 }
 1029         }
 1030 
 1031         /*
 1032          * Find the specified jail, or at least its parent.
 1033          * This abuses the file error codes ENOENT and EEXIST.
 1034          */
 1035         pr = NULL;
 1036         ppr = mypr;
 1037         if (cuflags == JAIL_CREATE && jid == 0 && name != NULL) {
 1038                 namelc = strrchr(name, '.');
 1039                 jid = strtoul(namelc != NULL ? namelc + 1 : name, &p, 10);
 1040                 if (*p != '\0')
 1041                         jid = 0;
 1042         }
 1043         sx_xlock(&allprison_lock);
 1044         if (jid != 0) {
 1045                 /*
 1046                  * See if a requested jid already exists.  There is an
 1047                  * information leak here if the jid exists but is not within
 1048                  * the caller's jail hierarchy.  Jail creators will get EEXIST
 1049                  * even though they cannot see the jail, and CREATE | UPDATE
 1050                  * will return ENOENT which is not normally a valid error.
 1051                  */
 1052                 if (jid < 0) {
 1053                         error = EINVAL;
 1054                         vfs_opterror(opts, "negative jid");
 1055                         goto done_unlock_list;
 1056                 }
 1057                 pr = prison_find(jid);
 1058                 if (pr != NULL) {
 1059                         ppr = pr->pr_parent;
 1060                         /* Create: jid must not exist. */
 1061                         if (cuflags == JAIL_CREATE) {
 1062                                 mtx_unlock(&pr->pr_mtx);
 1063                                 error = EEXIST;
 1064                                 vfs_opterror(opts, "jail %d already exists",
 1065                                     jid);
 1066                                 goto done_unlock_list;
 1067                         }
 1068                         if (!prison_ischild(mypr, pr)) {
 1069                                 mtx_unlock(&pr->pr_mtx);
 1070                                 pr = NULL;
 1071                         } else if (pr->pr_uref == 0) {
 1072                                 if (!(flags & JAIL_DYING)) {
 1073                                         mtx_unlock(&pr->pr_mtx);
 1074                                         error = ENOENT;
 1075                                         vfs_opterror(opts, "jail %d is dying",
 1076                                             jid);
 1077                                         goto done_unlock_list;
 1078                                 } else if ((flags & JAIL_ATTACH) ||
 1079                                     (pr_flags & PR_PERSIST)) {
 1080                                         /*
 1081                                          * A dying jail might be resurrected
 1082                                          * (via attach or persist), but first
 1083                                          * it must determine if another jail
 1084                                          * has claimed its name.  Accomplish
 1085                                          * this by implicitly re-setting the
 1086                                          * name.
 1087                                          */
 1088                                         if (name == NULL)
 1089                                                 name = prison_name(mypr, pr);
 1090                                 }
 1091                         }
 1092                 }
 1093                 if (pr == NULL) {
 1094                         /* Update: jid must exist. */
 1095                         if (cuflags == JAIL_UPDATE) {
 1096                                 error = ENOENT;
 1097                                 vfs_opterror(opts, "jail %d not found", jid);
 1098                                 goto done_unlock_list;
 1099                         }
 1100                 }
 1101         }
 1102         /*
 1103          * If the caller provided a name, look for a jail by that name.
 1104          * This has different semantics for creates and updates keyed by jid
 1105          * (where the name must not already exist in a different jail),
 1106          * and updates keyed by the name itself (where the name must exist
 1107          * because that is the jail being updated).
 1108          */
 1109         namelc = NULL;
 1110         if (name != NULL) {
 1111                 namelc = strrchr(name, '.');
 1112                 if (namelc == NULL)
 1113                         namelc = name;
 1114                 else {
 1115                         /*
 1116                          * This is a hierarchical name.  Split it into the
 1117                          * parent and child names, and make sure the parent
 1118                          * exists or matches an already found jail.
 1119                          */
 1120                         if (pr != NULL) {
 1121                                 if (strncmp(name, ppr->pr_name, namelc - name)
 1122                                     || ppr->pr_name[namelc - name] != '\0') {
 1123                                         mtx_unlock(&pr->pr_mtx);
 1124                                         error = EINVAL;
 1125                                         vfs_opterror(opts,
 1126                                             "cannot change jail's parent");
 1127                                         goto done_unlock_list;
 1128                                 }
 1129                         } else {
 1130                                 *namelc = '\0';
 1131                                 ppr = prison_find_name(mypr, name);
 1132                                 if (ppr == NULL) {
 1133                                         error = ENOENT;
 1134                                         vfs_opterror(opts,
 1135                                             "jail \"%s\" not found", name);
 1136                                         goto done_unlock_list;
 1137                                 }
 1138                                 mtx_unlock(&ppr->pr_mtx);
 1139                                 *namelc = '.';
 1140                         }
 1141                         namelc++;
 1142                 }
 1143                 if (namelc[0] != '\0') {
 1144                         pnamelen =
 1145                             (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
 1146  name_again:
 1147                         deadpr = NULL;
 1148                         FOREACH_PRISON_CHILD(ppr, tpr) {
 1149                                 if (tpr != pr && tpr->pr_ref > 0 &&
 1150                                     !strcmp(tpr->pr_name + pnamelen, namelc)) {
 1151                                         if (pr == NULL &&
 1152                                             cuflags != JAIL_CREATE) {
 1153                                                 mtx_lock(&tpr->pr_mtx);
 1154                                                 if (tpr->pr_ref > 0) {
 1155                                                         /*
 1156                                                          * Use this jail
 1157                                                          * for updates.
 1158                                                          */
 1159                                                         if (tpr->pr_uref > 0) {
 1160                                                                 pr = tpr;
 1161                                                                 break;
 1162                                                         }
 1163                                                         deadpr = tpr;
 1164                                                 }
 1165                                                 mtx_unlock(&tpr->pr_mtx);
 1166                                         } else if (tpr->pr_uref > 0) {
 1167                                                 /*
 1168                                                  * Create, or update(jid):
 1169                                                  * name must not exist in an
 1170                                                  * active sibling jail.
 1171                                                  */
 1172                                                 error = EEXIST;
 1173                                                 if (pr != NULL)
 1174                                                         mtx_unlock(&pr->pr_mtx);
 1175                                                 vfs_opterror(opts,
 1176                                                    "jail \"%s\" already exists",
 1177                                                    name);
 1178                                                 goto done_unlock_list;
 1179                                         }
 1180                                 }
 1181                         }
 1182                         /* If no active jail is found, use a dying one. */
 1183                         if (deadpr != NULL && pr == NULL) {
 1184                                 if (flags & JAIL_DYING) {
 1185                                         mtx_lock(&deadpr->pr_mtx);
 1186                                         if (deadpr->pr_ref == 0) {
 1187                                                 mtx_unlock(&deadpr->pr_mtx);
 1188                                                 goto name_again;
 1189                                         }
 1190                                         pr = deadpr;
 1191                                 } else if (cuflags == JAIL_UPDATE) {
 1192                                         error = ENOENT;
 1193                                         vfs_opterror(opts,
 1194                                             "jail \"%s\" is dying", name);
 1195                                         goto done_unlock_list;
 1196                                 }
 1197                         }
 1198                         /* Update: name must exist if no jid. */
 1199                         else if (cuflags == JAIL_UPDATE && pr == NULL) {
 1200                                 error = ENOENT;
 1201                                 vfs_opterror(opts, "jail \"%s\" not found",
 1202                                     name);
 1203                                 goto done_unlock_list;
 1204                         }
 1205                 }
 1206         }
 1207         /* Update: must provide a jid or name. */
 1208         else if (cuflags == JAIL_UPDATE && pr == NULL) {
 1209                 error = ENOENT;
 1210                 vfs_opterror(opts, "update specified no jail");
 1211                 goto done_unlock_list;
 1212         }
 1213 
 1214         /* If there's no prison to update, create a new one and link it in. */
 1215         if (pr == NULL) {
 1216                 for (tpr = mypr; tpr != NULL; tpr = tpr->pr_parent)
 1217                         if (tpr->pr_childcount >= tpr->pr_childmax) {
 1218                                 error = EPERM;
 1219                                 vfs_opterror(opts, "prison limit exceeded");
 1220                                 goto done_unlock_list;
 1221                         }
 1222                 created = 1;
 1223                 mtx_lock(&ppr->pr_mtx);
 1224                 if (ppr->pr_ref == 0) {
 1225                         mtx_unlock(&ppr->pr_mtx);
 1226                         error = ENOENT;
 1227                         vfs_opterror(opts, "jail \"%s\" not found",
 1228                             prison_name(mypr, ppr));
 1229                         goto done_unlock_list;
 1230                 }
 1231                 ppr->pr_ref++;
 1232                 ppr->pr_uref++;
 1233                 mtx_unlock(&ppr->pr_mtx);
 1234                 pr = malloc(sizeof(*pr), M_PRISON, M_WAITOK | M_ZERO);
 1235                 if (jid == 0) {
 1236                         /* Find the next free jid. */
 1237                         jid = lastprid + 1;
 1238  findnext:
 1239                         if (jid == JAIL_MAX)
 1240                                 jid = 1;
 1241                         TAILQ_FOREACH(tpr, &allprison, pr_list) {
 1242                                 if (tpr->pr_id < jid)
 1243                                         continue;
 1244                                 if (tpr->pr_id > jid || tpr->pr_ref == 0) {
 1245                                         TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
 1246                                         break;
 1247                                 }
 1248                                 if (jid == lastprid) {
 1249                                         error = EAGAIN;
 1250                                         vfs_opterror(opts,
 1251                                             "no available jail IDs");
 1252                                         free(pr, M_PRISON);
 1253                                         prison_deref(ppr, PD_DEREF |
 1254                                             PD_DEUREF | PD_LIST_XLOCKED);
 1255                                         goto done_releroot;
 1256                                 }
 1257                                 jid++;
 1258                                 goto findnext;
 1259                         }
 1260                         lastprid = jid;
 1261                 } else {
 1262                         /*
 1263                          * The jail already has a jid (that did not yet exist),
 1264                          * so just find where to insert it.
 1265                          */
 1266                         TAILQ_FOREACH(tpr, &allprison, pr_list)
 1267                                 if (tpr->pr_id >= jid) {
 1268                                         TAILQ_INSERT_BEFORE(tpr, pr, pr_list);
 1269                                         break;
 1270                                 }
 1271                 }
 1272                 if (tpr == NULL)
 1273                         TAILQ_INSERT_TAIL(&allprison, pr, pr_list);
 1274                 LIST_INSERT_HEAD(&ppr->pr_children, pr, pr_sibling);
 1275                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 1276                         tpr->pr_childcount++;
 1277 
 1278                 pr->pr_parent = ppr;
 1279                 pr->pr_id = jid;
 1280 
 1281                 /* Set some default values, and inherit some from the parent. */
 1282                 if (namelc == NULL)
 1283                         namelc = "";
 1284                 if (path == NULL) {
 1285                         path = "/";
 1286                         root = mypr->pr_root;
 1287                         vref(root);
 1288                 }
 1289                 strlcpy(pr->pr_hostuuid, DEFAULT_HOSTUUID, HOSTUUIDLEN);
 1290                 pr->pr_flags |= PR_HOST;
 1291 #if defined(INET) || defined(INET6)
 1292 #ifdef VIMAGE
 1293                 if (!(pr_flags & PR_VNET))
 1294 #endif
 1295                 {
 1296 #ifdef INET
 1297                         if (!(ch_flags & PR_IP4_USER))
 1298                                 pr->pr_flags |=
 1299                                     PR_IP4 | PR_IP4_USER | PR_IP4_DISABLE;
 1300                         else if (!(pr_flags & PR_IP4_USER)) {
 1301                                 pr->pr_flags |= ppr->pr_flags & PR_IP4;
 1302                                 if (ppr->pr_ip4 != NULL) {
 1303                                         pr->pr_ip4s = ppr->pr_ip4s;
 1304                                         pr->pr_ip4 = malloc(pr->pr_ip4s *
 1305                                             sizeof(struct in_addr), M_PRISON,
 1306                                             M_WAITOK);
 1307                                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 1308                                             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 1309                                 }
 1310                         }
 1311 #endif
 1312 #ifdef INET6
 1313                         if (!(ch_flags & PR_IP6_USER))
 1314                                 pr->pr_flags |=
 1315                                     PR_IP6 | PR_IP6_USER | PR_IP6_DISABLE;
 1316                         else if (!(pr_flags & PR_IP6_USER)) {
 1317                                 pr->pr_flags |= ppr->pr_flags & PR_IP6;
 1318                                 if (ppr->pr_ip6 != NULL) {
 1319                                         pr->pr_ip6s = ppr->pr_ip6s;
 1320                                         pr->pr_ip6 = malloc(pr->pr_ip6s *
 1321                                             sizeof(struct in6_addr), M_PRISON,
 1322                                             M_WAITOK);
 1323                                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 1324                                             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 1325                                 }
 1326                         }
 1327 #endif
 1328                 }
 1329 #endif
 1330                 /* Source address selection is always on by default. */
 1331                 pr->pr_flags |= _PR_IP_SADDRSEL;
 1332 
 1333                 pr->pr_securelevel = ppr->pr_securelevel;
 1334                 pr->pr_allow = JAIL_DEFAULT_ALLOW & ppr->pr_allow;
 1335                 pr->pr_enforce_statfs = JAIL_DEFAULT_ENFORCE_STATFS;
 1336                 pr->pr_devfs_rsnum = ppr->pr_devfs_rsnum;
 1337 
 1338                 pr->pr_osreldate = osreldt ? osreldt : ppr->pr_osreldate;
 1339                 if (osrelstr == NULL)
 1340                     strcpy(pr->pr_osrelease, ppr->pr_osrelease);
 1341                 else
 1342                     strcpy(pr->pr_osrelease, osrelstr);
 1343 
 1344                 LIST_INIT(&pr->pr_children);
 1345                 mtx_init(&pr->pr_mtx, "jail mutex", NULL, MTX_DEF | MTX_DUPOK);
 1346                 TASK_INIT(&pr->pr_task, 0, prison_complete, pr);
 1347 
 1348 #ifdef VIMAGE
 1349                 /* Allocate a new vnet if specified. */
 1350                 pr->pr_vnet = (pr_flags & PR_VNET)
 1351                     ? vnet_alloc() : ppr->pr_vnet;
 1352 #endif
 1353                 /*
 1354                  * Allocate a dedicated cpuset for each jail.
 1355                  * Unlike other initial settings, this may return an erorr.
 1356                  */
 1357                 error = cpuset_create_root(ppr, &pr->pr_cpuset);
 1358                 if (error) {
 1359                         prison_deref(pr, PD_LIST_XLOCKED);
 1360                         goto done_releroot;
 1361                 }
 1362 
 1363                 mtx_lock(&pr->pr_mtx);
 1364                 /*
 1365                  * New prisons do not yet have a reference, because we do not
 1366                  * want others to see the incomplete prison once the
 1367                  * allprison_lock is downgraded.
 1368                  */
 1369         } else {
 1370                 created = 0;
 1371                 /*
 1372                  * Grab a reference for existing prisons, to ensure they
 1373                  * continue to exist for the duration of the call.
 1374                  */
 1375                 pr->pr_ref++;
 1376 #if defined(VIMAGE) && (defined(INET) || defined(INET6))
 1377                 if ((pr->pr_flags & PR_VNET) &&
 1378                     (ch_flags & (PR_IP4_USER | PR_IP6_USER))) {
 1379                         error = EINVAL;
 1380                         vfs_opterror(opts,
 1381                             "vnet jails cannot have IP address restrictions");
 1382                         goto done_deref_locked;
 1383                 }
 1384 #endif
 1385 #ifdef INET
 1386                 if (PR_IP4_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
 1387                         error = EINVAL;
 1388                         vfs_opterror(opts,
 1389                             "ip4 cannot be changed after creation");
 1390                         goto done_deref_locked;
 1391                 }
 1392 #endif
 1393 #ifdef INET6
 1394                 if (PR_IP6_USER & ch_flags & (pr_flags ^ pr->pr_flags)) {
 1395                         error = EINVAL;
 1396                         vfs_opterror(opts,
 1397                             "ip6 cannot be changed after creation");
 1398                         goto done_deref_locked;
 1399                 }
 1400 #endif
 1401         }
 1402 
 1403         /* Do final error checking before setting anything. */
 1404         if (gotslevel) {
 1405                 if (slevel < ppr->pr_securelevel) {
 1406                         error = EPERM;
 1407                         goto done_deref_locked;
 1408                 }
 1409         }
 1410         if (gotchildmax) {
 1411                 if (childmax >= ppr->pr_childmax) {
 1412                         error = EPERM;
 1413                         goto done_deref_locked;
 1414                 }
 1415         }
 1416         if (gotenforce) {
 1417                 if (enforce < ppr->pr_enforce_statfs) {
 1418                         error = EPERM;
 1419                         goto done_deref_locked;
 1420                 }
 1421         }
 1422         if (gotrsnum) {
 1423                 /*
 1424                  * devfs_rsnum is a uint16_t
 1425                  */
 1426                 if (rsnum < 0 || rsnum > 65535) {
 1427                         error = EINVAL;
 1428                         goto done_deref_locked;
 1429                 }
 1430                 /*
 1431                  * Nested jails always inherit parent's devfs ruleset
 1432                  */
 1433                 if (jailed(td->td_ucred)) {
 1434                         if (rsnum > 0 && rsnum != ppr->pr_devfs_rsnum) {
 1435                                 error = EPERM;
 1436                                 goto done_deref_locked;
 1437                         } else
 1438                                 rsnum = ppr->pr_devfs_rsnum;
 1439                 }
 1440         }
 1441 #ifdef INET
 1442         if (ip4s > 0) {
 1443                 if (ppr->pr_flags & PR_IP4) {
 1444                         /*
 1445                          * Make sure the new set of IP addresses is a
 1446                          * subset of the parent's list.  Don't worry
 1447                          * about the parent being unlocked, as any
 1448                          * setting is done with allprison_lock held.
 1449                          */
 1450                         for (ij = 0; ij < ppr->pr_ip4s; ij++)
 1451                                 if (ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 1452                                         break;
 1453                         if (ij == ppr->pr_ip4s) {
 1454                                 error = EPERM;
 1455                                 goto done_deref_locked;
 1456                         }
 1457                         if (ip4s > 1) {
 1458                                 for (ii = ij = 1; ii < ip4s; ii++) {
 1459                                         if (ip4[ii].s_addr ==
 1460                                             ppr->pr_ip4[0].s_addr)
 1461                                                 continue;
 1462                                         for (; ij < ppr->pr_ip4s; ij++)
 1463                                                 if (ip4[ii].s_addr ==
 1464                                                     ppr->pr_ip4[ij].s_addr)
 1465                                                         break;
 1466                                         if (ij == ppr->pr_ip4s)
 1467                                                 break;
 1468                                 }
 1469                                 if (ij == ppr->pr_ip4s) {
 1470                                         error = EPERM;
 1471                                         goto done_deref_locked;
 1472                                 }
 1473                         }
 1474                 }
 1475                 /*
 1476                  * Check for conflicting IP addresses.  We permit them
 1477                  * if there is no more than one IP on each jail.  If
 1478                  * there is a duplicate on a jail with more than one
 1479                  * IP stop checking and return error.
 1480                  */
 1481                 tppr = ppr;
 1482 #ifdef VIMAGE
 1483                 for (; tppr != &prison0; tppr = tppr->pr_parent)
 1484                         if (tppr->pr_flags & PR_VNET)
 1485                                 break;
 1486 #endif
 1487                 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
 1488                         if (tpr == pr ||
 1489 #ifdef VIMAGE
 1490                             (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
 1491 #endif
 1492                             tpr->pr_uref == 0) {
 1493                                 descend = 0;
 1494                                 continue;
 1495                         }
 1496                         if (!(tpr->pr_flags & PR_IP4_USER))
 1497                                 continue;
 1498                         descend = 0;
 1499                         if (tpr->pr_ip4 == NULL ||
 1500                             (ip4s == 1 && tpr->pr_ip4s == 1))
 1501                                 continue;
 1502                         for (ii = 0; ii < ip4s; ii++) {
 1503                                 if (_prison_check_ip4(tpr, &ip4[ii]) == 0) {
 1504                                         error = EADDRINUSE;
 1505                                         vfs_opterror(opts,
 1506                                             "IPv4 addresses clash");
 1507                                         goto done_deref_locked;
 1508                                 }
 1509                         }
 1510                 }
 1511         }
 1512 #endif
 1513 #ifdef INET6
 1514         if (ip6s > 0) {
 1515                 if (ppr->pr_flags & PR_IP6) {
 1516                         /*
 1517                          * Make sure the new set of IP addresses is a
 1518                          * subset of the parent's list.
 1519                          */
 1520                         for (ij = 0; ij < ppr->pr_ip6s; ij++)
 1521                                 if (IN6_ARE_ADDR_EQUAL(&ip6[0],
 1522                                     &ppr->pr_ip6[ij]))
 1523                                         break;
 1524                         if (ij == ppr->pr_ip6s) {
 1525                                 error = EPERM;
 1526                                 goto done_deref_locked;
 1527                         }
 1528                         if (ip6s > 1) {
 1529                                 for (ii = ij = 1; ii < ip6s; ii++) {
 1530                                         if (IN6_ARE_ADDR_EQUAL(&ip6[ii],
 1531                                              &ppr->pr_ip6[0]))
 1532                                                 continue;
 1533                                         for (; ij < ppr->pr_ip6s; ij++)
 1534                                                 if (IN6_ARE_ADDR_EQUAL(
 1535                                                     &ip6[ii], &ppr->pr_ip6[ij]))
 1536                                                         break;
 1537                                         if (ij == ppr->pr_ip6s)
 1538                                                 break;
 1539                                 }
 1540                                 if (ij == ppr->pr_ip6s) {
 1541                                         error = EPERM;
 1542                                         goto done_deref_locked;
 1543                                 }
 1544                         }
 1545                 }
 1546                 /* Check for conflicting IP addresses. */
 1547                 tppr = ppr;
 1548 #ifdef VIMAGE
 1549                 for (; tppr != &prison0; tppr = tppr->pr_parent)
 1550                         if (tppr->pr_flags & PR_VNET)
 1551                                 break;
 1552 #endif
 1553                 FOREACH_PRISON_DESCENDANT(tppr, tpr, descend) {
 1554                         if (tpr == pr ||
 1555 #ifdef VIMAGE
 1556                             (tpr != tppr && (tpr->pr_flags & PR_VNET)) ||
 1557 #endif
 1558                             tpr->pr_uref == 0) {
 1559                                 descend = 0;
 1560                                 continue;
 1561                         }
 1562                         if (!(tpr->pr_flags & PR_IP6_USER))
 1563                                 continue;
 1564                         descend = 0;
 1565                         if (tpr->pr_ip6 == NULL ||
 1566                             (ip6s == 1 && tpr->pr_ip6s == 1))
 1567                                 continue;
 1568                         for (ii = 0; ii < ip6s; ii++) {
 1569                                 if (_prison_check_ip6(tpr, &ip6[ii]) == 0) {
 1570                                         error = EADDRINUSE;
 1571                                         vfs_opterror(opts,
 1572                                             "IPv6 addresses clash");
 1573                                         goto done_deref_locked;
 1574                                 }
 1575                         }
 1576                 }
 1577         }
 1578 #endif
 1579         onamelen = namelen = 0;
 1580         if (namelc != NULL) {
 1581                 /* Give a default name of the jid.  Also allow the name to be
 1582                  * explicitly the jid - but not any other number, and only in
 1583                  * normal form (no leading zero/etc).
 1584                  */
 1585                 if (namelc[0] == '\0')
 1586                         snprintf(namelc = numbuf, sizeof(numbuf), "%d", jid);
 1587                 else if ((strtoul(namelc, &p, 10) != jid ||
 1588                           namelc[0] < '1' || namelc[0] > '9') && *p == '\0') {
 1589                         error = EINVAL;
 1590                         vfs_opterror(opts,
 1591                             "name cannot be numeric (unless it is the jid)");
 1592                         goto done_deref_locked;
 1593                 }
 1594                 /*
 1595                  * Make sure the name isn't too long for the prison or its
 1596                  * children.
 1597                  */
 1598                 pnamelen = (ppr == &prison0) ? 0 : strlen(ppr->pr_name) + 1;
 1599                 onamelen = strlen(pr->pr_name + pnamelen);
 1600                 namelen = strlen(namelc);
 1601                 if (pnamelen + namelen + 1 > sizeof(pr->pr_name)) {
 1602                         error = ENAMETOOLONG;
 1603                         goto done_deref_locked;
 1604                 }
 1605                 FOREACH_PRISON_DESCENDANT(pr, tpr, descend) {
 1606                         if (strlen(tpr->pr_name) + (namelen - onamelen) >=
 1607                             sizeof(pr->pr_name)) {
 1608                                 error = ENAMETOOLONG;
 1609                                 goto done_deref_locked;
 1610                         }
 1611                 }
 1612         }
 1613         if (pr_allow & ~ppr->pr_allow) {
 1614                 error = EPERM;
 1615                 goto done_deref_locked;
 1616         }
 1617 
 1618         /*
 1619          * Let modules check their parameters.  This requires unlocking and
 1620          * then re-locking the prison, but this is still a valid state as long
 1621          * as allprison_lock remains xlocked.
 1622          */
 1623         mtx_unlock(&pr->pr_mtx);
 1624         error = osd_jail_call(pr, PR_METHOD_CHECK, opts);
 1625         if (error != 0) {
 1626                 prison_deref(pr, created
 1627                     ? PD_LIST_XLOCKED
 1628                     : PD_DEREF | PD_LIST_XLOCKED);
 1629                 goto done_releroot;
 1630         }
 1631         mtx_lock(&pr->pr_mtx);
 1632 
 1633         /* At this point, all valid parameters should have been noted. */
 1634         TAILQ_FOREACH(opt, opts, link) {
 1635                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
 1636                         error = EINVAL;
 1637                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
 1638                         goto done_deref_locked;
 1639                 }
 1640         }
 1641 
 1642         /* Set the parameters of the prison. */
 1643 #ifdef INET
 1644         redo_ip4 = 0;
 1645         if (pr_flags & PR_IP4_USER) {
 1646                 pr->pr_flags |= PR_IP4;
 1647                 free(pr->pr_ip4, M_PRISON);
 1648                 pr->pr_ip4s = ip4s;
 1649                 pr->pr_ip4 = ip4;
 1650                 ip4 = NULL;
 1651                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1652 #ifdef VIMAGE
 1653                         if (tpr->pr_flags & PR_VNET) {
 1654                                 descend = 0;
 1655                                 continue;
 1656                         }
 1657 #endif
 1658                         if (prison_restrict_ip4(tpr, NULL)) {
 1659                                 redo_ip4 = 1;
 1660                                 descend = 0;
 1661                         }
 1662                 }
 1663         }
 1664 #endif
 1665 #ifdef INET6
 1666         redo_ip6 = 0;
 1667         if (pr_flags & PR_IP6_USER) {
 1668                 pr->pr_flags |= PR_IP6;
 1669                 free(pr->pr_ip6, M_PRISON);
 1670                 pr->pr_ip6s = ip6s;
 1671                 pr->pr_ip6 = ip6;
 1672                 ip6 = NULL;
 1673                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1674 #ifdef VIMAGE
 1675                         if (tpr->pr_flags & PR_VNET) {
 1676                                 descend = 0;
 1677                                 continue;
 1678                         }
 1679 #endif
 1680                         if (prison_restrict_ip6(tpr, NULL)) {
 1681                                 redo_ip6 = 1;
 1682                                 descend = 0;
 1683                         }
 1684                 }
 1685         }
 1686 #endif
 1687         if (gotslevel) {
 1688                 pr->pr_securelevel = slevel;
 1689                 /* Set all child jails to be at least this level. */
 1690                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1691                         if (tpr->pr_securelevel < slevel)
 1692                                 tpr->pr_securelevel = slevel;
 1693         }
 1694         if (gotchildmax) {
 1695                 pr->pr_childmax = childmax;
 1696                 /* Set all child jails to under this limit. */
 1697                 FOREACH_PRISON_DESCENDANT_LOCKED_LEVEL(pr, tpr, descend, level)
 1698                         if (tpr->pr_childmax > childmax - level)
 1699                                 tpr->pr_childmax = childmax > level
 1700                                     ? childmax - level : 0;
 1701         }
 1702         if (gotenforce) {
 1703                 pr->pr_enforce_statfs = enforce;
 1704                 /* Pass this restriction on to the children. */
 1705                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1706                         if (tpr->pr_enforce_statfs < enforce)
 1707                                 tpr->pr_enforce_statfs = enforce;
 1708         }
 1709         if (gotrsnum) {
 1710                 pr->pr_devfs_rsnum = rsnum;
 1711                 /* Pass this restriction on to the children. */
 1712                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1713                         tpr->pr_devfs_rsnum = rsnum;
 1714         }
 1715         if (namelc != NULL) {
 1716                 if (ppr == &prison0)
 1717                         strlcpy(pr->pr_name, namelc, sizeof(pr->pr_name));
 1718                 else
 1719                         snprintf(pr->pr_name, sizeof(pr->pr_name), "%s.%s",
 1720                             ppr->pr_name, namelc);
 1721                 /* Change this component of child names. */
 1722                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1723                         bcopy(tpr->pr_name + onamelen, tpr->pr_name + namelen,
 1724                             strlen(tpr->pr_name + onamelen) + 1);
 1725                         bcopy(pr->pr_name, tpr->pr_name, namelen);
 1726                 }
 1727         }
 1728         if (path != NULL) {
 1729                 /* Try to keep a real-rooted full pathname. */
 1730                 if (fullpath_disabled && path[0] == '/' &&
 1731                     strcmp(mypr->pr_path, "/"))
 1732                         snprintf(pr->pr_path, sizeof(pr->pr_path), "%s%s",
 1733                             mypr->pr_path, path);
 1734                 else
 1735                         strlcpy(pr->pr_path, path, sizeof(pr->pr_path));
 1736                 pr->pr_root = root;
 1737         }
 1738         if (PR_HOST & ch_flags & ~pr_flags) {
 1739                 if (pr->pr_flags & PR_HOST) {
 1740                         /*
 1741                          * Copy the parent's host info.  As with pr_ip4 above,
 1742                          * the lack of a lock on the parent is not a problem;
 1743                          * it is always set with allprison_lock at least
 1744                          * shared, and is held exclusively here.
 1745                          */
 1746                         strlcpy(pr->pr_hostname, pr->pr_parent->pr_hostname,
 1747                             sizeof(pr->pr_hostname));
 1748                         strlcpy(pr->pr_domainname, pr->pr_parent->pr_domainname,
 1749                             sizeof(pr->pr_domainname));
 1750                         strlcpy(pr->pr_hostuuid, pr->pr_parent->pr_hostuuid,
 1751                             sizeof(pr->pr_hostuuid));
 1752                         pr->pr_hostid = pr->pr_parent->pr_hostid;
 1753                 }
 1754         } else if (host != NULL || domain != NULL || uuid != NULL || gothid) {
 1755                 /* Set this prison, and any descendants without PR_HOST. */
 1756                 if (host != NULL)
 1757                         strlcpy(pr->pr_hostname, host, sizeof(pr->pr_hostname));
 1758                 if (domain != NULL)
 1759                         strlcpy(pr->pr_domainname, domain, 
 1760                             sizeof(pr->pr_domainname));
 1761                 if (uuid != NULL)
 1762                         strlcpy(pr->pr_hostuuid, uuid, sizeof(pr->pr_hostuuid));
 1763                 if (gothid)
 1764                         pr->pr_hostid = hid;
 1765                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1766                         if (tpr->pr_flags & PR_HOST)
 1767                                 descend = 0;
 1768                         else {
 1769                                 if (host != NULL)
 1770                                         strlcpy(tpr->pr_hostname,
 1771                                             pr->pr_hostname,
 1772                                             sizeof(tpr->pr_hostname));
 1773                                 if (domain != NULL)
 1774                                         strlcpy(tpr->pr_domainname, 
 1775                                             pr->pr_domainname,
 1776                                             sizeof(tpr->pr_domainname));
 1777                                 if (uuid != NULL)
 1778                                         strlcpy(tpr->pr_hostuuid,
 1779                                             pr->pr_hostuuid,
 1780                                             sizeof(tpr->pr_hostuuid));
 1781                                 if (gothid)
 1782                                         tpr->pr_hostid = hid;
 1783                         }
 1784                 }
 1785         }
 1786         if ((tallow = ch_allow & ~pr_allow)) {
 1787                 /* Clear allow bits in all children. */
 1788                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend)
 1789                         tpr->pr_allow &= ~tallow;
 1790         }
 1791         pr->pr_allow = (pr->pr_allow & ~ch_allow) | pr_allow;
 1792         /*
 1793          * Persistent prisons get an extra reference, and prisons losing their
 1794          * persist flag lose that reference.  Only do this for existing prisons
 1795          * for now, so new ones will remain unseen until after the module
 1796          * handlers have completed.
 1797          */
 1798         born = pr->pr_uref == 0;
 1799         if (!created && (ch_flags & PR_PERSIST & (pr_flags ^ pr->pr_flags))) {
 1800                 if (pr_flags & PR_PERSIST) {
 1801                         pr->pr_ref++;
 1802                         pr->pr_uref++;
 1803                 } else {
 1804                         pr->pr_ref--;
 1805                         pr->pr_uref--;
 1806                 }
 1807         }
 1808         pr->pr_flags = (pr->pr_flags & ~ch_flags) | pr_flags;
 1809         mtx_unlock(&pr->pr_mtx);
 1810 
 1811 #ifdef RACCT
 1812         if (racct_enable && created)
 1813                 prison_racct_attach(pr);
 1814 #endif
 1815 
 1816         /* Locks may have prevented a complete restriction of child IP
 1817          * addresses.  If so, allocate some more memory and try again.
 1818          */
 1819 #ifdef INET
 1820         while (redo_ip4) {
 1821                 ip4s = pr->pr_ip4s;
 1822                 ip4 = malloc(ip4s * sizeof(*ip4), M_PRISON, M_WAITOK);
 1823                 mtx_lock(&pr->pr_mtx);
 1824                 redo_ip4 = 0;
 1825                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1826 #ifdef VIMAGE
 1827                         if (tpr->pr_flags & PR_VNET) {
 1828                                 descend = 0;
 1829                                 continue;
 1830                         }
 1831 #endif
 1832                         if (prison_restrict_ip4(tpr, ip4)) {
 1833                                 if (ip4 != NULL)
 1834                                         ip4 = NULL;
 1835                                 else
 1836                                         redo_ip4 = 1;
 1837                         }
 1838                 }
 1839                 mtx_unlock(&pr->pr_mtx);
 1840         }
 1841 #endif
 1842 #ifdef INET6
 1843         while (redo_ip6) {
 1844                 ip6s = pr->pr_ip6s;
 1845                 ip6 = malloc(ip6s * sizeof(*ip6), M_PRISON, M_WAITOK);
 1846                 mtx_lock(&pr->pr_mtx);
 1847                 redo_ip6 = 0;
 1848                 FOREACH_PRISON_DESCENDANT_LOCKED(pr, tpr, descend) {
 1849 #ifdef VIMAGE
 1850                         if (tpr->pr_flags & PR_VNET) {
 1851                                 descend = 0;
 1852                                 continue;
 1853                         }
 1854 #endif
 1855                         if (prison_restrict_ip6(tpr, ip6)) {
 1856                                 if (ip6 != NULL)
 1857                                         ip6 = NULL;
 1858                                 else
 1859                                         redo_ip6 = 1;
 1860                         }
 1861                 }
 1862                 mtx_unlock(&pr->pr_mtx);
 1863         }
 1864 #endif
 1865 
 1866         /* Let the modules do their work. */
 1867         sx_downgrade(&allprison_lock);
 1868         if (born) {
 1869                 error = osd_jail_call(pr, PR_METHOD_CREATE, opts);
 1870                 if (error) {
 1871                         (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
 1872                         prison_deref(pr, created
 1873                             ? PD_LIST_SLOCKED
 1874                             : PD_DEREF | PD_LIST_SLOCKED);
 1875                         goto done_errmsg;
 1876                 }
 1877         }
 1878         error = osd_jail_call(pr, PR_METHOD_SET, opts);
 1879         if (error) {
 1880                 if (born)
 1881                         (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
 1882                 prison_deref(pr, created
 1883                     ? PD_LIST_SLOCKED
 1884                     : PD_DEREF | PD_LIST_SLOCKED);
 1885                 goto done_errmsg;
 1886         }
 1887 
 1888         /* Attach this process to the prison if requested. */
 1889         if (flags & JAIL_ATTACH) {
 1890                 mtx_lock(&pr->pr_mtx);
 1891                 error = do_jail_attach(td, pr);
 1892                 if (error) {
 1893                         vfs_opterror(opts, "attach failed");
 1894                         if (!created)
 1895                                 prison_deref(pr, PD_DEREF);
 1896                         goto done_errmsg;
 1897                 }
 1898         }
 1899 
 1900 #ifdef RACCT
 1901         if (racct_enable && !created) {
 1902                 if (!(flags & JAIL_ATTACH))
 1903                         sx_sunlock(&allprison_lock);
 1904                 prison_racct_modify(pr);
 1905                 if (!(flags & JAIL_ATTACH))
 1906                         sx_slock(&allprison_lock);
 1907         }
 1908 #endif
 1909 
 1910         td->td_retval[0] = pr->pr_id;
 1911 
 1912         /*
 1913          * Now that it is all there, drop the temporary reference from existing
 1914          * prisons.  Or add a reference to newly created persistent prisons
 1915          * (which was not done earlier so that the prison would not be publicly
 1916          * visible).
 1917          */
 1918         if (!created) {
 1919                 prison_deref(pr, (flags & JAIL_ATTACH)
 1920                     ? PD_DEREF
 1921                     : PD_DEREF | PD_LIST_SLOCKED);
 1922         } else {
 1923                 if (pr_flags & PR_PERSIST) {
 1924                         mtx_lock(&pr->pr_mtx);
 1925                         pr->pr_ref++;
 1926                         pr->pr_uref++;
 1927                         mtx_unlock(&pr->pr_mtx);
 1928                 }
 1929                 if (!(flags & JAIL_ATTACH))
 1930                         sx_sunlock(&allprison_lock);
 1931         }
 1932 
 1933         goto done_free;
 1934 
 1935  done_deref_locked:
 1936         prison_deref(pr, created
 1937             ? PD_LOCKED | PD_LIST_XLOCKED
 1938             : PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 1939         goto done_releroot;
 1940  done_unlock_list:
 1941         sx_xunlock(&allprison_lock);
 1942  done_releroot:
 1943         if (root != NULL)
 1944                 vrele(root);
 1945  done_errmsg:
 1946         if (error) {
 1947                 if (vfs_getopt(opts, "errmsg", (void **)&errmsg,
 1948                     &errmsg_len) == 0 && errmsg_len > 0) {
 1949                         errmsg_pos = 2 * vfs_getopt_pos(opts, "errmsg") + 1;
 1950                         if (optuio->uio_segflg == UIO_SYSSPACE)
 1951                                 bcopy(errmsg,
 1952                                     optuio->uio_iov[errmsg_pos].iov_base,
 1953                                     errmsg_len);
 1954                         else
 1955                                 copyout(errmsg,
 1956                                     optuio->uio_iov[errmsg_pos].iov_base,
 1957                                     errmsg_len);
 1958                 }
 1959         }
 1960  done_free:
 1961 #ifdef INET
 1962         free(ip4, M_PRISON);
 1963 #endif
 1964 #ifdef INET6
 1965         free(ip6, M_PRISON);
 1966 #endif
 1967         if (g_path != NULL)
 1968                 free(g_path, M_TEMP);
 1969         vfs_freeopts(opts);
 1970         return (error);
 1971 }
 1972 
 1973 
 1974 /*
 1975  * struct jail_get_args {
 1976  *      struct iovec *iovp;
 1977  *      unsigned int iovcnt;
 1978  *      int flags;
 1979  * };
 1980  */
 1981 int
 1982 sys_jail_get(struct thread *td, struct jail_get_args *uap)
 1983 {
 1984         struct uio *auio;
 1985         int error;
 1986 
 1987         /* Check that we have an even number of iovecs. */
 1988         if (uap->iovcnt & 1)
 1989                 return (EINVAL);
 1990 
 1991         error = copyinuio(uap->iovp, uap->iovcnt, &auio);
 1992         if (error)
 1993                 return (error);
 1994         error = kern_jail_get(td, auio, uap->flags);
 1995         if (error == 0)
 1996                 error = copyout(auio->uio_iov, uap->iovp,
 1997                     uap->iovcnt * sizeof (struct iovec));
 1998         free(auio, M_IOV);
 1999         return (error);
 2000 }
 2001 
 2002 int
 2003 kern_jail_get(struct thread *td, struct uio *optuio, int flags)
 2004 {
 2005         struct prison *pr, *mypr;
 2006         struct vfsopt *opt;
 2007         struct vfsoptlist *opts;
 2008         char *errmsg, *name;
 2009         int error, errmsg_len, errmsg_pos, fi, i, jid, len, locked, pos;
 2010 
 2011         if (flags & ~JAIL_GET_MASK)
 2012                 return (EINVAL);
 2013 
 2014         /* Get the parameter list. */
 2015         error = vfs_buildopts(optuio, &opts);
 2016         if (error)
 2017                 return (error);
 2018         errmsg_pos = vfs_getopt_pos(opts, "errmsg");
 2019         mypr = td->td_ucred->cr_prison;
 2020 
 2021         /*
 2022          * Find the prison specified by one of: lastjid, jid, name.
 2023          */
 2024         sx_slock(&allprison_lock);
 2025         error = vfs_copyopt(opts, "lastjid", &jid, sizeof(jid));
 2026         if (error == 0) {
 2027                 TAILQ_FOREACH(pr, &allprison, pr_list) {
 2028                         if (pr->pr_id > jid && prison_ischild(mypr, pr)) {
 2029                                 mtx_lock(&pr->pr_mtx);
 2030                                 if (pr->pr_ref > 0 &&
 2031                                     (pr->pr_uref > 0 || (flags & JAIL_DYING)))
 2032                                         break;
 2033                                 mtx_unlock(&pr->pr_mtx);
 2034                         }
 2035                 }
 2036                 if (pr != NULL)
 2037                         goto found_prison;
 2038                 error = ENOENT;
 2039                 vfs_opterror(opts, "no jail after %d", jid);
 2040                 goto done_unlock_list;
 2041         } else if (error != ENOENT)
 2042                 goto done_unlock_list;
 2043 
 2044         error = vfs_copyopt(opts, "jid", &jid, sizeof(jid));
 2045         if (error == 0) {
 2046                 if (jid != 0) {
 2047                         pr = prison_find_child(mypr, jid);
 2048                         if (pr != NULL) {
 2049                                 if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 2050                                         mtx_unlock(&pr->pr_mtx);
 2051                                         error = ENOENT;
 2052                                         vfs_opterror(opts, "jail %d is dying",
 2053                                             jid);
 2054                                         goto done_unlock_list;
 2055                                 }
 2056                                 goto found_prison;
 2057                         }
 2058                         error = ENOENT;
 2059                         vfs_opterror(opts, "jail %d not found", jid);
 2060                         goto done_unlock_list;
 2061                 }
 2062         } else if (error != ENOENT)
 2063                 goto done_unlock_list;
 2064 
 2065         error = vfs_getopt(opts, "name", (void **)&name, &len);
 2066         if (error == 0) {
 2067                 if (len == 0 || name[len - 1] != '\0') {
 2068                         error = EINVAL;
 2069                         goto done_unlock_list;
 2070                 }
 2071                 pr = prison_find_name(mypr, name);
 2072                 if (pr != NULL) {
 2073                         if (pr->pr_uref == 0 && !(flags & JAIL_DYING)) {
 2074                                 mtx_unlock(&pr->pr_mtx);
 2075                                 error = ENOENT;
 2076                                 vfs_opterror(opts, "jail \"%s\" is dying",
 2077                                     name);
 2078                                 goto done_unlock_list;
 2079                         }
 2080                         goto found_prison;
 2081                 }
 2082                 error = ENOENT;
 2083                 vfs_opterror(opts, "jail \"%s\" not found", name);
 2084                 goto done_unlock_list;
 2085         } else if (error != ENOENT)
 2086                 goto done_unlock_list;
 2087 
 2088         vfs_opterror(opts, "no jail specified");
 2089         error = ENOENT;
 2090         goto done_unlock_list;
 2091 
 2092  found_prison:
 2093         /* Get the parameters of the prison. */
 2094         pr->pr_ref++;
 2095         locked = PD_LOCKED;
 2096         td->td_retval[0] = pr->pr_id;
 2097         error = vfs_setopt(opts, "jid", &pr->pr_id, sizeof(pr->pr_id));
 2098         if (error != 0 && error != ENOENT)
 2099                 goto done_deref;
 2100         i = (pr->pr_parent == mypr) ? 0 : pr->pr_parent->pr_id;
 2101         error = vfs_setopt(opts, "parent", &i, sizeof(i));
 2102         if (error != 0 && error != ENOENT)
 2103                 goto done_deref;
 2104         error = vfs_setopts(opts, "name", prison_name(mypr, pr));
 2105         if (error != 0 && error != ENOENT)
 2106                 goto done_deref;
 2107         error = vfs_setopt(opts, "cpuset.id", &pr->pr_cpuset->cs_id,
 2108             sizeof(pr->pr_cpuset->cs_id));
 2109         if (error != 0 && error != ENOENT)
 2110                 goto done_deref;
 2111         error = vfs_setopts(opts, "path", prison_path(mypr, pr));
 2112         if (error != 0 && error != ENOENT)
 2113                 goto done_deref;
 2114 #ifdef INET
 2115         error = vfs_setopt_part(opts, "ip4.addr", pr->pr_ip4,
 2116             pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2117         if (error != 0 && error != ENOENT)
 2118                 goto done_deref;
 2119 #endif
 2120 #ifdef INET6
 2121         error = vfs_setopt_part(opts, "ip6.addr", pr->pr_ip6,
 2122             pr->pr_ip6s * sizeof(*pr->pr_ip6));
 2123         if (error != 0 && error != ENOENT)
 2124                 goto done_deref;
 2125 #endif
 2126         error = vfs_setopt(opts, "securelevel", &pr->pr_securelevel,
 2127             sizeof(pr->pr_securelevel));
 2128         if (error != 0 && error != ENOENT)
 2129                 goto done_deref;
 2130         error = vfs_setopt(opts, "children.cur", &pr->pr_childcount,
 2131             sizeof(pr->pr_childcount));
 2132         if (error != 0 && error != ENOENT)
 2133                 goto done_deref;
 2134         error = vfs_setopt(opts, "children.max", &pr->pr_childmax,
 2135             sizeof(pr->pr_childmax));
 2136         if (error != 0 && error != ENOENT)
 2137                 goto done_deref;
 2138         error = vfs_setopts(opts, "host.hostname", pr->pr_hostname);
 2139         if (error != 0 && error != ENOENT)
 2140                 goto done_deref;
 2141         error = vfs_setopts(opts, "host.domainname", pr->pr_domainname);
 2142         if (error != 0 && error != ENOENT)
 2143                 goto done_deref;
 2144         error = vfs_setopts(opts, "host.hostuuid", pr->pr_hostuuid);
 2145         if (error != 0 && error != ENOENT)
 2146                 goto done_deref;
 2147 #ifdef COMPAT_FREEBSD32
 2148         if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
 2149                 uint32_t hid32 = pr->pr_hostid;
 2150 
 2151                 error = vfs_setopt(opts, "host.hostid", &hid32, sizeof(hid32));
 2152         } else
 2153 #endif
 2154         error = vfs_setopt(opts, "host.hostid", &pr->pr_hostid,
 2155             sizeof(pr->pr_hostid));
 2156         if (error != 0 && error != ENOENT)
 2157                 goto done_deref;
 2158         error = vfs_setopt(opts, "enforce_statfs", &pr->pr_enforce_statfs,
 2159             sizeof(pr->pr_enforce_statfs));
 2160         if (error != 0 && error != ENOENT)
 2161                 goto done_deref;
 2162         error = vfs_setopt(opts, "devfs_ruleset", &pr->pr_devfs_rsnum,
 2163             sizeof(pr->pr_devfs_rsnum));
 2164         if (error != 0 && error != ENOENT)
 2165                 goto done_deref;
 2166         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 2167             fi++) {
 2168                 if (pr_flag_names[fi] == NULL)
 2169                         continue;
 2170                 i = (pr->pr_flags & (1 << fi)) ? 1 : 0;
 2171                 error = vfs_setopt(opts, pr_flag_names[fi], &i, sizeof(i));
 2172                 if (error != 0 && error != ENOENT)
 2173                         goto done_deref;
 2174                 i = !i;
 2175                 error = vfs_setopt(opts, pr_flag_nonames[fi], &i, sizeof(i));
 2176                 if (error != 0 && error != ENOENT)
 2177                         goto done_deref;
 2178         }
 2179         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 2180             fi++) {
 2181                 i = pr->pr_flags &
 2182                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 2183                 i = pr_flag_jailsys[fi].disable &&
 2184                       (i == pr_flag_jailsys[fi].disable) ? JAIL_SYS_DISABLE
 2185                     : (i == pr_flag_jailsys[fi].new) ? JAIL_SYS_NEW
 2186                     : JAIL_SYS_INHERIT;
 2187                 error =
 2188                     vfs_setopt(opts, pr_flag_jailsys[fi].name, &i, sizeof(i));
 2189                 if (error != 0 && error != ENOENT)
 2190                         goto done_deref;
 2191         }
 2192         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 2193             fi++) {
 2194                 if (pr_allow_names[fi] == NULL)
 2195                         continue;
 2196                 i = (pr->pr_allow & (1 << fi)) ? 1 : 0;
 2197                 error = vfs_setopt(opts, pr_allow_names[fi], &i, sizeof(i));
 2198                 if (error != 0 && error != ENOENT)
 2199                         goto done_deref;
 2200                 i = !i;
 2201                 error = vfs_setopt(opts, pr_allow_nonames[fi], &i, sizeof(i));
 2202                 if (error != 0 && error != ENOENT)
 2203                         goto done_deref;
 2204         }
 2205         i = (pr->pr_uref == 0);
 2206         error = vfs_setopt(opts, "dying", &i, sizeof(i));
 2207         if (error != 0 && error != ENOENT)
 2208                 goto done_deref;
 2209         i = !i;
 2210         error = vfs_setopt(opts, "nodying", &i, sizeof(i));
 2211         if (error != 0 && error != ENOENT)
 2212                 goto done_deref;
 2213         error = vfs_setopt(opts, "osreldate", &pr->pr_osreldate,
 2214             sizeof(pr->pr_osreldate));
 2215         if (error != 0 && error != ENOENT)
 2216                 goto done_deref;
 2217         error = vfs_setopts(opts, "osrelease", pr->pr_osrelease);
 2218         if (error != 0 && error != ENOENT)
 2219                 goto done_deref;
 2220 
 2221         /* Get the module parameters. */
 2222         mtx_unlock(&pr->pr_mtx);
 2223         locked = 0;
 2224         error = osd_jail_call(pr, PR_METHOD_GET, opts);
 2225         if (error)
 2226                 goto done_deref;
 2227         prison_deref(pr, PD_DEREF | PD_LIST_SLOCKED);
 2228 
 2229         /* By now, all parameters should have been noted. */
 2230         TAILQ_FOREACH(opt, opts, link) {
 2231                 if (!opt->seen && strcmp(opt->name, "errmsg")) {
 2232                         error = EINVAL;
 2233                         vfs_opterror(opts, "unknown parameter: %s", opt->name);
 2234                         goto done_errmsg;
 2235                 }
 2236         }
 2237 
 2238         /* Write the fetched parameters back to userspace. */
 2239         error = 0;
 2240         TAILQ_FOREACH(opt, opts, link) {
 2241                 if (opt->pos >= 0 && opt->pos != errmsg_pos) {
 2242                         pos = 2 * opt->pos + 1;
 2243                         optuio->uio_iov[pos].iov_len = opt->len;
 2244                         if (opt->value != NULL) {
 2245                                 if (optuio->uio_segflg == UIO_SYSSPACE) {
 2246                                         bcopy(opt->value,
 2247                                             optuio->uio_iov[pos].iov_base,
 2248                                             opt->len);
 2249                                 } else {
 2250                                         error = copyout(opt->value,
 2251                                             optuio->uio_iov[pos].iov_base,
 2252                                             opt->len);
 2253                                         if (error)
 2254                                                 break;
 2255                                 }
 2256                         }
 2257                 }
 2258         }
 2259         goto done_errmsg;
 2260 
 2261  done_deref:
 2262         prison_deref(pr, locked | PD_DEREF | PD_LIST_SLOCKED);
 2263         goto done_errmsg;
 2264 
 2265  done_unlock_list:
 2266         sx_sunlock(&allprison_lock);
 2267  done_errmsg:
 2268         if (error && errmsg_pos >= 0) {
 2269                 vfs_getopt(opts, "errmsg", (void **)&errmsg, &errmsg_len);
 2270                 errmsg_pos = 2 * errmsg_pos + 1;
 2271                 if (errmsg_len > 0) {
 2272                         if (optuio->uio_segflg == UIO_SYSSPACE)
 2273                                 bcopy(errmsg,
 2274                                     optuio->uio_iov[errmsg_pos].iov_base,
 2275                                     errmsg_len);
 2276                         else
 2277                                 copyout(errmsg,
 2278                                     optuio->uio_iov[errmsg_pos].iov_base,
 2279                                     errmsg_len);
 2280                 }
 2281         }
 2282         vfs_freeopts(opts);
 2283         return (error);
 2284 }
 2285 
 2286 
 2287 /*
 2288  * struct jail_remove_args {
 2289  *      int jid;
 2290  * };
 2291  */
 2292 int
 2293 sys_jail_remove(struct thread *td, struct jail_remove_args *uap)
 2294 {
 2295         struct prison *pr, *cpr, *lpr, *tpr;
 2296         int descend, error;
 2297 
 2298         error = priv_check(td, PRIV_JAIL_REMOVE);
 2299         if (error)
 2300                 return (error);
 2301 
 2302         sx_xlock(&allprison_lock);
 2303         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2304         if (pr == NULL) {
 2305                 sx_xunlock(&allprison_lock);
 2306                 return (EINVAL);
 2307         }
 2308 
 2309         /* Remove all descendants of this prison, then remove this prison. */
 2310         pr->pr_ref++;
 2311         if (!LIST_EMPTY(&pr->pr_children)) {
 2312                 mtx_unlock(&pr->pr_mtx);
 2313                 lpr = NULL;
 2314                 FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 2315                         mtx_lock(&cpr->pr_mtx);
 2316                         if (cpr->pr_ref > 0) {
 2317                                 tpr = cpr;
 2318                                 cpr->pr_ref++;
 2319                         } else {
 2320                                 /* Already removed - do not do it again. */
 2321                                 tpr = NULL;
 2322                         }
 2323                         mtx_unlock(&cpr->pr_mtx);
 2324                         if (lpr != NULL) {
 2325                                 mtx_lock(&lpr->pr_mtx);
 2326                                 prison_remove_one(lpr);
 2327                                 sx_xlock(&allprison_lock);
 2328                         }
 2329                         lpr = tpr;
 2330                 }
 2331                 if (lpr != NULL) {
 2332                         mtx_lock(&lpr->pr_mtx);
 2333                         prison_remove_one(lpr);
 2334                         sx_xlock(&allprison_lock);
 2335                 }
 2336                 mtx_lock(&pr->pr_mtx);
 2337         }
 2338         prison_remove_one(pr);
 2339         return (0);
 2340 }
 2341 
 2342 static void
 2343 prison_remove_one(struct prison *pr)
 2344 {
 2345         struct proc *p;
 2346         int deuref;
 2347 
 2348         /* If the prison was persistent, it is not anymore. */
 2349         deuref = 0;
 2350         if (pr->pr_flags & PR_PERSIST) {
 2351                 pr->pr_ref--;
 2352                 deuref = PD_DEUREF;
 2353                 pr->pr_flags &= ~PR_PERSIST;
 2354         }
 2355 
 2356         /*
 2357          * jail_remove added a reference.  If that's the only one, remove
 2358          * the prison now.
 2359          */
 2360         KASSERT(pr->pr_ref > 0,
 2361             ("prison_remove_one removing a dead prison (jid=%d)", pr->pr_id));
 2362         if (pr->pr_ref == 1) {
 2363                 prison_deref(pr,
 2364                     deuref | PD_DEREF | PD_LOCKED | PD_LIST_XLOCKED);
 2365                 return;
 2366         }
 2367 
 2368         mtx_unlock(&pr->pr_mtx);
 2369         sx_xunlock(&allprison_lock);
 2370         /*
 2371          * Kill all processes unfortunate enough to be attached to this prison.
 2372          */
 2373         sx_slock(&allproc_lock);
 2374         LIST_FOREACH(p, &allproc, p_list) {
 2375                 PROC_LOCK(p);
 2376                 if (p->p_state != PRS_NEW && p->p_ucred &&
 2377                     p->p_ucred->cr_prison == pr)
 2378                         kern_psignal(p, SIGKILL);
 2379                 PROC_UNLOCK(p);
 2380         }
 2381         sx_sunlock(&allproc_lock);
 2382         /* Remove the temporary reference added by jail_remove. */
 2383         prison_deref(pr, deuref | PD_DEREF);
 2384 }
 2385 
 2386 
 2387 /*
 2388  * struct jail_attach_args {
 2389  *      int jid;
 2390  * };
 2391  */
 2392 int
 2393 sys_jail_attach(struct thread *td, struct jail_attach_args *uap)
 2394 {
 2395         struct prison *pr;
 2396         int error;
 2397 
 2398         error = priv_check(td, PRIV_JAIL_ATTACH);
 2399         if (error)
 2400                 return (error);
 2401 
 2402         /*
 2403          * Start with exclusive hold on allprison_lock to ensure that a possible
 2404          * PR_METHOD_REMOVE call isn't concurrent with jail_set or jail_remove.
 2405          * But then immediately downgrade it since we don't need to stop
 2406          * readers.
 2407          */
 2408         sx_xlock(&allprison_lock);
 2409         sx_downgrade(&allprison_lock);
 2410         pr = prison_find_child(td->td_ucred->cr_prison, uap->jid);
 2411         if (pr == NULL) {
 2412                 sx_sunlock(&allprison_lock);
 2413                 return (EINVAL);
 2414         }
 2415 
 2416         /*
 2417          * Do not allow a process to attach to a prison that is not
 2418          * considered to be "alive".
 2419          */
 2420         if (pr->pr_uref == 0) {
 2421                 mtx_unlock(&pr->pr_mtx);
 2422                 sx_sunlock(&allprison_lock);
 2423                 return (EINVAL);
 2424         }
 2425 
 2426         return (do_jail_attach(td, pr));
 2427 }
 2428 
 2429 static int
 2430 do_jail_attach(struct thread *td, struct prison *pr)
 2431 {
 2432         struct proc *p;
 2433         struct ucred *newcred, *oldcred;
 2434         int error;
 2435 
 2436         /*
 2437          * XXX: Note that there is a slight race here if two threads
 2438          * in the same privileged process attempt to attach to two
 2439          * different jails at the same time.  It is important for
 2440          * user processes not to do this, or they might end up with
 2441          * a process root from one prison, but attached to the jail
 2442          * of another.
 2443          */
 2444         pr->pr_ref++;
 2445         pr->pr_uref++;
 2446         mtx_unlock(&pr->pr_mtx);
 2447 
 2448         /* Let modules do whatever they need to prepare for attaching. */
 2449         error = osd_jail_call(pr, PR_METHOD_ATTACH, td);
 2450         if (error) {
 2451                 prison_deref(pr, PD_DEREF | PD_DEUREF | PD_LIST_SLOCKED);
 2452                 return (error);
 2453         }
 2454         sx_sunlock(&allprison_lock);
 2455 
 2456         /*
 2457          * Reparent the newly attached process to this jail.
 2458          */
 2459         p = td->td_proc;
 2460         error = cpuset_setproc_update_set(p, pr->pr_cpuset);
 2461         if (error)
 2462                 goto e_revert_osd;
 2463 
 2464         vn_lock(pr->pr_root, LK_EXCLUSIVE | LK_RETRY);
 2465         if ((error = change_dir(pr->pr_root, td)) != 0)
 2466                 goto e_unlock;
 2467 #ifdef MAC
 2468         if ((error = mac_vnode_check_chroot(td->td_ucred, pr->pr_root)))
 2469                 goto e_unlock;
 2470 #endif
 2471         VOP_UNLOCK(pr->pr_root, 0);
 2472         if ((error = change_root(pr->pr_root, td)))
 2473                 goto e_revert_osd;
 2474 
 2475         newcred = crget();
 2476         PROC_LOCK(p);
 2477         oldcred = crcopysafe(p, newcred);
 2478         newcred->cr_prison = pr;
 2479         proc_set_cred(p, newcred);
 2480         setsugid(p);
 2481         PROC_UNLOCK(p);
 2482 #ifdef RACCT
 2483         racct_proc_ucred_changed(p, oldcred, newcred);
 2484 #endif
 2485         prison_deref(oldcred->cr_prison, PD_DEREF | PD_DEUREF);
 2486         crfree(oldcred);
 2487         return (0);
 2488 
 2489  e_unlock:
 2490         VOP_UNLOCK(pr->pr_root, 0);
 2491  e_revert_osd:
 2492         /* Tell modules this thread is still in its old jail after all. */
 2493         (void)osd_jail_call(td->td_ucred->cr_prison, PR_METHOD_ATTACH, td);
 2494         prison_deref(pr, PD_DEREF | PD_DEUREF);
 2495         return (error);
 2496 }
 2497 
 2498 
 2499 /*
 2500  * Returns a locked prison instance, or NULL on failure.
 2501  */
 2502 struct prison *
 2503 prison_find(int prid)
 2504 {
 2505         struct prison *pr;
 2506 
 2507         sx_assert(&allprison_lock, SX_LOCKED);
 2508         TAILQ_FOREACH(pr, &allprison, pr_list) {
 2509                 if (pr->pr_id == prid) {
 2510                         mtx_lock(&pr->pr_mtx);
 2511                         if (pr->pr_ref > 0)
 2512                                 return (pr);
 2513                         mtx_unlock(&pr->pr_mtx);
 2514                 }
 2515         }
 2516         return (NULL);
 2517 }
 2518 
 2519 /*
 2520  * Find a prison that is a descendant of mypr.  Returns a locked prison or NULL.
 2521  */
 2522 struct prison *
 2523 prison_find_child(struct prison *mypr, int prid)
 2524 {
 2525         struct prison *pr;
 2526         int descend;
 2527 
 2528         sx_assert(&allprison_lock, SX_LOCKED);
 2529         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2530                 if (pr->pr_id == prid) {
 2531                         mtx_lock(&pr->pr_mtx);
 2532                         if (pr->pr_ref > 0)
 2533                                 return (pr);
 2534                         mtx_unlock(&pr->pr_mtx);
 2535                 }
 2536         }
 2537         return (NULL);
 2538 }
 2539 
 2540 /*
 2541  * Look for the name relative to mypr.  Returns a locked prison or NULL.
 2542  */
 2543 struct prison *
 2544 prison_find_name(struct prison *mypr, const char *name)
 2545 {
 2546         struct prison *pr, *deadpr;
 2547         size_t mylen;
 2548         int descend;
 2549 
 2550         sx_assert(&allprison_lock, SX_LOCKED);
 2551         mylen = (mypr == &prison0) ? 0 : strlen(mypr->pr_name) + 1;
 2552  again:
 2553         deadpr = NULL;
 2554         FOREACH_PRISON_DESCENDANT(mypr, pr, descend) {
 2555                 if (!strcmp(pr->pr_name + mylen, name)) {
 2556                         mtx_lock(&pr->pr_mtx);
 2557                         if (pr->pr_ref > 0) {
 2558                                 if (pr->pr_uref > 0)
 2559                                         return (pr);
 2560                                 deadpr = pr;
 2561                         }
 2562                         mtx_unlock(&pr->pr_mtx);
 2563                 }
 2564         }
 2565         /* There was no valid prison - perhaps there was a dying one. */
 2566         if (deadpr != NULL) {
 2567                 mtx_lock(&deadpr->pr_mtx);
 2568                 if (deadpr->pr_ref == 0) {
 2569                         mtx_unlock(&deadpr->pr_mtx);
 2570                         goto again;
 2571                 }
 2572         }
 2573         return (deadpr);
 2574 }
 2575 
 2576 /*
 2577  * See if a prison has the specific flag set.
 2578  */
 2579 int
 2580 prison_flag(struct ucred *cred, unsigned flag)
 2581 {
 2582 
 2583         /* This is an atomic read, so no locking is necessary. */
 2584         return (cred->cr_prison->pr_flags & flag);
 2585 }
 2586 
 2587 int
 2588 prison_allow(struct ucred *cred, unsigned flag)
 2589 {
 2590 
 2591         /* This is an atomic read, so no locking is necessary. */
 2592         return (cred->cr_prison->pr_allow & flag);
 2593 }
 2594 
 2595 /*
 2596  * Remove a prison reference.  If that was the last reference, remove the
 2597  * prison itself - but not in this context in case there are locks held.
 2598  */
 2599 void
 2600 prison_free_locked(struct prison *pr)
 2601 {
 2602         int ref;
 2603 
 2604         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2605         ref = --pr->pr_ref;
 2606         mtx_unlock(&pr->pr_mtx);
 2607         if (ref == 0)
 2608                 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
 2609 }
 2610 
 2611 void
 2612 prison_free(struct prison *pr)
 2613 {
 2614 
 2615         mtx_lock(&pr->pr_mtx);
 2616         prison_free_locked(pr);
 2617 }
 2618 
 2619 /*
 2620  * Complete a call to either prison_free or prison_proc_free.
 2621  */
 2622 static void
 2623 prison_complete(void *context, int pending)
 2624 {
 2625         struct prison *pr = context;
 2626 
 2627         sx_xlock(&allprison_lock);
 2628         mtx_lock(&pr->pr_mtx);
 2629         prison_deref(pr, pr->pr_uref
 2630             ? PD_DEREF | PD_DEUREF | PD_LOCKED | PD_LIST_XLOCKED
 2631             : PD_LOCKED | PD_LIST_XLOCKED);
 2632 }
 2633 
 2634 /*
 2635  * Remove a prison reference (usually).  This internal version assumes no
 2636  * mutexes are held, except perhaps the prison itself.  If there are no more
 2637  * references, release and delist the prison.  On completion, the prison lock
 2638  * and the allprison lock are both unlocked.
 2639  */
 2640 static void
 2641 prison_deref(struct prison *pr, int flags)
 2642 {
 2643         struct prison *ppr, *tpr;
 2644         int ref, lasturef;
 2645 
 2646         if (!(flags & PD_LOCKED))
 2647                 mtx_lock(&pr->pr_mtx);
 2648         for (;;) {
 2649                 if (flags & PD_DEUREF) {
 2650                         KASSERT(pr->pr_uref > 0,
 2651                             ("prison_deref PD_DEUREF on a dead prison (jid=%d)",
 2652                              pr->pr_id));
 2653                         pr->pr_uref--;
 2654                         lasturef = pr->pr_uref == 0;
 2655                         if (lasturef)
 2656                                 pr->pr_ref++;
 2657                         KASSERT(prison0.pr_uref != 0, ("prison0 pr_uref=0"));
 2658                 } else
 2659                         lasturef = 0;
 2660                 if (flags & PD_DEREF) {
 2661                         KASSERT(pr->pr_ref > 0,
 2662                             ("prison_deref PD_DEREF on a dead prison (jid=%d)",
 2663                              pr->pr_id));
 2664                         pr->pr_ref--;
 2665                 }
 2666                 ref = pr->pr_ref;
 2667                 mtx_unlock(&pr->pr_mtx);
 2668 
 2669                 /*
 2670                  * Tell the modules if the last user reference was removed
 2671                  * (even it sticks around in dying state).
 2672                  */
 2673                 if (lasturef) {
 2674                         if (!(flags & (PD_LIST_SLOCKED | PD_LIST_XLOCKED))) {
 2675                                 sx_xlock(&allprison_lock);
 2676                                 flags |= PD_LIST_XLOCKED;
 2677                         }
 2678                         (void)osd_jail_call(pr, PR_METHOD_REMOVE, NULL);
 2679                         mtx_lock(&pr->pr_mtx);
 2680                         ref = --pr->pr_ref;
 2681                         mtx_unlock(&pr->pr_mtx);
 2682                 }
 2683 
 2684                 /* If the prison still has references, nothing else to do. */
 2685                 if (ref > 0) {
 2686                         if (flags & PD_LIST_SLOCKED)
 2687                                 sx_sunlock(&allprison_lock);
 2688                         else if (flags & PD_LIST_XLOCKED)
 2689                                 sx_xunlock(&allprison_lock);
 2690                         return;
 2691                 }
 2692 
 2693                 if (flags & PD_LIST_SLOCKED) {
 2694                         if (!sx_try_upgrade(&allprison_lock)) {
 2695                                 sx_sunlock(&allprison_lock);
 2696                                 sx_xlock(&allprison_lock);
 2697                         }
 2698                 } else if (!(flags & PD_LIST_XLOCKED))
 2699                         sx_xlock(&allprison_lock);
 2700 
 2701                 TAILQ_REMOVE(&allprison, pr, pr_list);
 2702                 LIST_REMOVE(pr, pr_sibling);
 2703                 ppr = pr->pr_parent;
 2704                 for (tpr = ppr; tpr != NULL; tpr = tpr->pr_parent)
 2705                         tpr->pr_childcount--;
 2706                 sx_xunlock(&allprison_lock);
 2707 
 2708 #ifdef VIMAGE
 2709                 if (pr->pr_vnet != ppr->pr_vnet)
 2710                         vnet_destroy(pr->pr_vnet);
 2711 #endif
 2712                 if (pr->pr_root != NULL)
 2713                         vrele(pr->pr_root);
 2714                 mtx_destroy(&pr->pr_mtx);
 2715 #ifdef INET
 2716                 free(pr->pr_ip4, M_PRISON);
 2717 #endif
 2718 #ifdef INET6
 2719                 free(pr->pr_ip6, M_PRISON);
 2720 #endif
 2721                 if (pr->pr_cpuset != NULL)
 2722                         cpuset_rel(pr->pr_cpuset);
 2723                 osd_jail_exit(pr);
 2724 #ifdef RACCT
 2725                 if (racct_enable)
 2726                         prison_racct_detach(pr);
 2727 #endif
 2728                 free(pr, M_PRISON);
 2729 
 2730                 /* Removing a prison frees a reference on its parent. */
 2731                 pr = ppr;
 2732                 mtx_lock(&pr->pr_mtx);
 2733                 flags = PD_DEREF | PD_DEUREF;
 2734         }
 2735 }
 2736 
 2737 void
 2738 prison_hold_locked(struct prison *pr)
 2739 {
 2740 
 2741         mtx_assert(&pr->pr_mtx, MA_OWNED);
 2742         KASSERT(pr->pr_ref > 0,
 2743             ("Trying to hold dead prison (jid=%d).", pr->pr_id));
 2744         pr->pr_ref++;
 2745 }
 2746 
 2747 void
 2748 prison_hold(struct prison *pr)
 2749 {
 2750 
 2751         mtx_lock(&pr->pr_mtx);
 2752         prison_hold_locked(pr);
 2753         mtx_unlock(&pr->pr_mtx);
 2754 }
 2755 
 2756 void
 2757 prison_proc_hold(struct prison *pr)
 2758 {
 2759 
 2760         mtx_lock(&pr->pr_mtx);
 2761         KASSERT(pr->pr_uref > 0,
 2762             ("Cannot add a process to a non-alive prison (jid=%d)", pr->pr_id));
 2763         pr->pr_uref++;
 2764         mtx_unlock(&pr->pr_mtx);
 2765 }
 2766 
 2767 void
 2768 prison_proc_free(struct prison *pr)
 2769 {
 2770 
 2771         mtx_lock(&pr->pr_mtx);
 2772         KASSERT(pr->pr_uref > 0,
 2773             ("Trying to kill a process in a dead prison (jid=%d)", pr->pr_id));
 2774         if (pr->pr_uref > 1)
 2775                 pr->pr_uref--;
 2776         else {
 2777                 /*
 2778                  * Don't remove the last user reference in this context, which
 2779                  * is expected to be a process that is not only locked, but
 2780                  * also half dead.
 2781                  */
 2782                 pr->pr_ref++;
 2783                 mtx_unlock(&pr->pr_mtx);
 2784                 taskqueue_enqueue(taskqueue_thread, &pr->pr_task);
 2785                 return;
 2786         }
 2787         mtx_unlock(&pr->pr_mtx);
 2788 }
 2789 
 2790 
 2791 #ifdef INET
 2792 /*
 2793  * Restrict a prison's IP address list with its parent's, possibly replacing
 2794  * it.  Return true if the replacement buffer was used (or would have been).
 2795  */
 2796 static int
 2797 prison_restrict_ip4(struct prison *pr, struct in_addr *newip4)
 2798 {
 2799         int ii, ij, used;
 2800         struct prison *ppr;
 2801 
 2802         ppr = pr->pr_parent;
 2803         if (!(pr->pr_flags & PR_IP4_USER)) {
 2804                 /* This has no user settings, so just copy the parent's list. */
 2805                 if (pr->pr_ip4s < ppr->pr_ip4s) {
 2806                         /*
 2807                          * There's no room for the parent's list.  Use the
 2808                          * new list buffer, which is assumed to be big enough
 2809                          * (if it was passed).  If there's no buffer, try to
 2810                          * allocate one.
 2811                          */
 2812                         used = 1;
 2813                         if (newip4 == NULL) {
 2814                                 newip4 = malloc(ppr->pr_ip4s * sizeof(*newip4),
 2815                                     M_PRISON, M_NOWAIT);
 2816                                 if (newip4 != NULL)
 2817                                         used = 0;
 2818                         }
 2819                         if (newip4 != NULL) {
 2820                                 bcopy(ppr->pr_ip4, newip4,
 2821                                     ppr->pr_ip4s * sizeof(*newip4));
 2822                                 free(pr->pr_ip4, M_PRISON);
 2823                                 pr->pr_ip4 = newip4;
 2824                                 pr->pr_ip4s = ppr->pr_ip4s;
 2825                         }
 2826                         return (used);
 2827                 }
 2828                 pr->pr_ip4s = ppr->pr_ip4s;
 2829                 if (pr->pr_ip4s > 0)
 2830                         bcopy(ppr->pr_ip4, pr->pr_ip4,
 2831                             pr->pr_ip4s * sizeof(*newip4));
 2832                 else if (pr->pr_ip4 != NULL) {
 2833                         free(pr->pr_ip4, M_PRISON);
 2834                         pr->pr_ip4 = NULL;
 2835                 }
 2836         } else if (pr->pr_ip4s > 0) {
 2837                 /* Remove addresses that aren't in the parent. */
 2838                 for (ij = 0; ij < ppr->pr_ip4s; ij++)
 2839                         if (pr->pr_ip4[0].s_addr == ppr->pr_ip4[ij].s_addr)
 2840                                 break;
 2841                 if (ij < ppr->pr_ip4s)
 2842                         ii = 1;
 2843                 else {
 2844                         bcopy(pr->pr_ip4 + 1, pr->pr_ip4,
 2845                             --pr->pr_ip4s * sizeof(*pr->pr_ip4));
 2846                         ii = 0;
 2847                 }
 2848                 for (ij = 1; ii < pr->pr_ip4s; ) {
 2849                         if (pr->pr_ip4[ii].s_addr == ppr->pr_ip4[0].s_addr) {
 2850                                 ii++;
 2851                                 continue;
 2852                         }
 2853                         switch (ij >= ppr->pr_ip4s ? -1 :
 2854                                 qcmp_v4(&pr->pr_ip4[ii], &ppr->pr_ip4[ij])) {
 2855                         case -1:
 2856                                 bcopy(pr->pr_ip4 + ii + 1, pr->pr_ip4 + ii,
 2857                                     (--pr->pr_ip4s - ii) * sizeof(*pr->pr_ip4));
 2858                                 break;
 2859                         case 0:
 2860                                 ii++;
 2861                                 ij++;
 2862                                 break;
 2863                         case 1:
 2864                                 ij++;
 2865                                 break;
 2866                         }
 2867                 }
 2868                 if (pr->pr_ip4s == 0) {
 2869                         pr->pr_flags |= PR_IP4_DISABLE;
 2870                         free(pr->pr_ip4, M_PRISON);
 2871                         pr->pr_ip4 = NULL;
 2872                 }
 2873         }
 2874         return (0);
 2875 }
 2876 
 2877 /*
 2878  * Pass back primary IPv4 address of this jail.
 2879  *
 2880  * If not restricted return success but do not alter the address.  Caller has
 2881  * to make sure to initialize it correctly (e.g. INADDR_ANY).
 2882  *
 2883  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 2884  * Address returned in NBO.
 2885  */
 2886 int
 2887 prison_get_ip4(struct ucred *cred, struct in_addr *ia)
 2888 {
 2889         struct prison *pr;
 2890 
 2891         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2892         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2893 
 2894         pr = cred->cr_prison;
 2895         if (!(pr->pr_flags & PR_IP4))
 2896                 return (0);
 2897         mtx_lock(&pr->pr_mtx);
 2898         if (!(pr->pr_flags & PR_IP4)) {
 2899                 mtx_unlock(&pr->pr_mtx);
 2900                 return (0);
 2901         }
 2902         if (pr->pr_ip4 == NULL) {
 2903                 mtx_unlock(&pr->pr_mtx);
 2904                 return (EAFNOSUPPORT);
 2905         }
 2906 
 2907         ia->s_addr = pr->pr_ip4[0].s_addr;
 2908         mtx_unlock(&pr->pr_mtx);
 2909         return (0);
 2910 }
 2911 
 2912 /*
 2913  * Return 1 if we should do proper source address selection or are not jailed.
 2914  * We will return 0 if we should bypass source address selection in favour
 2915  * of the primary jail IPv4 address. Only in this case *ia will be updated and
 2916  * returned in NBO.
 2917  * Return EAFNOSUPPORT, in case this jail does not allow IPv4.
 2918  */
 2919 int
 2920 prison_saddrsel_ip4(struct ucred *cred, struct in_addr *ia)
 2921 {
 2922         struct prison *pr;
 2923         struct in_addr lia;
 2924         int error;
 2925 
 2926         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2927         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2928 
 2929         if (!jailed(cred))
 2930                 return (1);
 2931 
 2932         pr = cred->cr_prison;
 2933         if (pr->pr_flags & PR_IP4_SADDRSEL)
 2934                 return (1);
 2935 
 2936         lia.s_addr = INADDR_ANY;
 2937         error = prison_get_ip4(cred, &lia);
 2938         if (error)
 2939                 return (error);
 2940         if (lia.s_addr == INADDR_ANY)
 2941                 return (1);
 2942 
 2943         ia->s_addr = lia.s_addr;
 2944         return (0);
 2945 }
 2946 
 2947 /*
 2948  * Return true if pr1 and pr2 have the same IPv4 address restrictions.
 2949  */
 2950 int
 2951 prison_equal_ip4(struct prison *pr1, struct prison *pr2)
 2952 {
 2953 
 2954         if (pr1 == pr2)
 2955                 return (1);
 2956 
 2957         /*
 2958          * No need to lock since the PR_IP4_USER flag can't be altered for
 2959          * existing prisons.
 2960          */
 2961         while (pr1 != &prison0 &&
 2962 #ifdef VIMAGE
 2963                !(pr1->pr_flags & PR_VNET) &&
 2964 #endif
 2965                !(pr1->pr_flags & PR_IP4_USER))
 2966                 pr1 = pr1->pr_parent;
 2967         while (pr2 != &prison0 &&
 2968 #ifdef VIMAGE
 2969                !(pr2->pr_flags & PR_VNET) &&
 2970 #endif
 2971                !(pr2->pr_flags & PR_IP4_USER))
 2972                 pr2 = pr2->pr_parent;
 2973         return (pr1 == pr2);
 2974 }
 2975 
 2976 /*
 2977  * Make sure our (source) address is set to something meaningful to this
 2978  * jail.
 2979  *
 2980  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 2981  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 2982  * doesn't allow IPv4.  Address passed in in NBO and returned in NBO.
 2983  */
 2984 int
 2985 prison_local_ip4(struct ucred *cred, struct in_addr *ia)
 2986 {
 2987         struct prison *pr;
 2988         struct in_addr ia0;
 2989         int error;
 2990 
 2991         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 2992         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 2993 
 2994         pr = cred->cr_prison;
 2995         if (!(pr->pr_flags & PR_IP4))
 2996                 return (0);
 2997         mtx_lock(&pr->pr_mtx);
 2998         if (!(pr->pr_flags & PR_IP4)) {
 2999                 mtx_unlock(&pr->pr_mtx);
 3000                 return (0);
 3001         }
 3002         if (pr->pr_ip4 == NULL) {
 3003                 mtx_unlock(&pr->pr_mtx);
 3004                 return (EAFNOSUPPORT);
 3005         }
 3006 
 3007         ia0.s_addr = ntohl(ia->s_addr);
 3008         if (ia0.s_addr == INADDR_LOOPBACK) {
 3009                 ia->s_addr = pr->pr_ip4[0].s_addr;
 3010                 mtx_unlock(&pr->pr_mtx);
 3011                 return (0);
 3012         }
 3013 
 3014         if (ia0.s_addr == INADDR_ANY) {
 3015                 /*
 3016                  * In case there is only 1 IPv4 address, bind directly.
 3017                  */
 3018                 if (pr->pr_ip4s == 1)
 3019                         ia->s_addr = pr->pr_ip4[0].s_addr;
 3020                 mtx_unlock(&pr->pr_mtx);
 3021                 return (0);
 3022         }
 3023 
 3024         error = _prison_check_ip4(pr, ia);
 3025         mtx_unlock(&pr->pr_mtx);
 3026         return (error);
 3027 }
 3028 
 3029 /*
 3030  * Rewrite destination address in case we will connect to loopback address.
 3031  *
 3032  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv4.
 3033  * Address passed in in NBO and returned in NBO.
 3034  */
 3035 int
 3036 prison_remote_ip4(struct ucred *cred, struct in_addr *ia)
 3037 {
 3038         struct prison *pr;
 3039 
 3040         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3041         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 3042 
 3043         pr = cred->cr_prison;
 3044         if (!(pr->pr_flags & PR_IP4))
 3045                 return (0);
 3046         mtx_lock(&pr->pr_mtx);
 3047         if (!(pr->pr_flags & PR_IP4)) {
 3048                 mtx_unlock(&pr->pr_mtx);
 3049                 return (0);
 3050         }
 3051         if (pr->pr_ip4 == NULL) {
 3052                 mtx_unlock(&pr->pr_mtx);
 3053                 return (EAFNOSUPPORT);
 3054         }
 3055 
 3056         if (ntohl(ia->s_addr) == INADDR_LOOPBACK) {
 3057                 ia->s_addr = pr->pr_ip4[0].s_addr;
 3058                 mtx_unlock(&pr->pr_mtx);
 3059                 return (0);
 3060         }
 3061 
 3062         /*
 3063          * Return success because nothing had to be changed.
 3064          */
 3065         mtx_unlock(&pr->pr_mtx);
 3066         return (0);
 3067 }
 3068 
 3069 /*
 3070  * Check if given address belongs to the jail referenced by cred/prison.
 3071  *
 3072  * Returns 0 if jail doesn't restrict IPv4 or if address belongs to jail,
 3073  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3074  * doesn't allow IPv4.  Address passed in in NBO.
 3075  */
 3076 static int
 3077 _prison_check_ip4(struct prison *pr, struct in_addr *ia)
 3078 {
 3079         int i, a, z, d;
 3080 
 3081         /*
 3082          * Check the primary IP.
 3083          */
 3084         if (pr->pr_ip4[0].s_addr == ia->s_addr)
 3085                 return (0);
 3086 
 3087         /*
 3088          * All the other IPs are sorted so we can do a binary search.
 3089          */
 3090         a = 0;
 3091         z = pr->pr_ip4s - 2;
 3092         while (a <= z) {
 3093                 i = (a + z) / 2;
 3094                 d = qcmp_v4(&pr->pr_ip4[i+1], ia);
 3095                 if (d > 0)
 3096                         z = i - 1;
 3097                 else if (d < 0)
 3098                         a = i + 1;
 3099                 else
 3100                         return (0);
 3101         }
 3102 
 3103         return (EADDRNOTAVAIL);
 3104 }
 3105 
 3106 int
 3107 prison_check_ip4(struct ucred *cred, struct in_addr *ia)
 3108 {
 3109         struct prison *pr;
 3110         int error;
 3111 
 3112         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3113         KASSERT(ia != NULL, ("%s: ia is NULL", __func__));
 3114 
 3115         pr = cred->cr_prison;
 3116         if (!(pr->pr_flags & PR_IP4))
 3117                 return (0);
 3118         mtx_lock(&pr->pr_mtx);
 3119         if (!(pr->pr_flags & PR_IP4)) {
 3120                 mtx_unlock(&pr->pr_mtx);
 3121                 return (0);
 3122         }
 3123         if (pr->pr_ip4 == NULL) {
 3124                 mtx_unlock(&pr->pr_mtx);
 3125                 return (EAFNOSUPPORT);
 3126         }
 3127 
 3128         error = _prison_check_ip4(pr, ia);
 3129         mtx_unlock(&pr->pr_mtx);
 3130         return (error);
 3131 }
 3132 #endif
 3133 
 3134 #ifdef INET6
 3135 static int
 3136 prison_restrict_ip6(struct prison *pr, struct in6_addr *newip6)
 3137 {
 3138         int ii, ij, used;
 3139         struct prison *ppr;
 3140 
 3141         ppr = pr->pr_parent;
 3142         if (!(pr->pr_flags & PR_IP6_USER)) {
 3143                 /* This has no user settings, so just copy the parent's list. */
 3144                 if (pr->pr_ip6s < ppr->pr_ip6s) {
 3145                         /*
 3146                          * There's no room for the parent's list.  Use the
 3147                          * new list buffer, which is assumed to be big enough
 3148                          * (if it was passed).  If there's no buffer, try to
 3149                          * allocate one.
 3150                          */
 3151                         used = 1;
 3152                         if (newip6 == NULL) {
 3153                                 newip6 = malloc(ppr->pr_ip6s * sizeof(*newip6),
 3154                                     M_PRISON, M_NOWAIT);
 3155                                 if (newip6 != NULL)
 3156                                         used = 0;
 3157                         }
 3158                         if (newip6 != NULL) {
 3159                                 bcopy(ppr->pr_ip6, newip6,
 3160                                     ppr->pr_ip6s * sizeof(*newip6));
 3161                                 free(pr->pr_ip6, M_PRISON);
 3162                                 pr->pr_ip6 = newip6;
 3163                                 pr->pr_ip6s = ppr->pr_ip6s;
 3164                         }
 3165                         return (used);
 3166                 }
 3167                 pr->pr_ip6s = ppr->pr_ip6s;
 3168                 if (pr->pr_ip6s > 0)
 3169                         bcopy(ppr->pr_ip6, pr->pr_ip6,
 3170                             pr->pr_ip6s * sizeof(*newip6));
 3171                 else if (pr->pr_ip6 != NULL) {
 3172                         free(pr->pr_ip6, M_PRISON);
 3173                         pr->pr_ip6 = NULL;
 3174                 }
 3175         } else if (pr->pr_ip6s > 0) {
 3176                 /* Remove addresses that aren't in the parent. */
 3177                 for (ij = 0; ij < ppr->pr_ip6s; ij++)
 3178                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0],
 3179                             &ppr->pr_ip6[ij]))
 3180                                 break;
 3181                 if (ij < ppr->pr_ip6s)
 3182                         ii = 1;
 3183                 else {
 3184                         bcopy(pr->pr_ip6 + 1, pr->pr_ip6,
 3185                             --pr->pr_ip6s * sizeof(*pr->pr_ip6));
 3186                         ii = 0;
 3187                 }
 3188                 for (ij = 1; ii < pr->pr_ip6s; ) {
 3189                         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[ii],
 3190                             &ppr->pr_ip6[0])) {
 3191                                 ii++;
 3192                                 continue;
 3193                         }
 3194                         switch (ij >= ppr->pr_ip6s ? -1 :
 3195                                 qcmp_v6(&pr->pr_ip6[ii], &ppr->pr_ip6[ij])) {
 3196                         case -1:
 3197                                 bcopy(pr->pr_ip6 + ii + 1, pr->pr_ip6 + ii,
 3198                                     (--pr->pr_ip6s - ii) * sizeof(*pr->pr_ip6));
 3199                                 break;
 3200                         case 0:
 3201                                 ii++;
 3202                                 ij++;
 3203                                 break;
 3204                         case 1:
 3205                                 ij++;
 3206                                 break;
 3207                         }
 3208                 }
 3209                 if (pr->pr_ip6s == 0) {
 3210                         pr->pr_flags |= PR_IP6_DISABLE;
 3211                         free(pr->pr_ip6, M_PRISON);
 3212                         pr->pr_ip6 = NULL;
 3213                 }
 3214         }
 3215         return 0;
 3216 }
 3217 
 3218 /*
 3219  * Pass back primary IPv6 address for this jail.
 3220  *
 3221  * If not restricted return success but do not alter the address.  Caller has
 3222  * to make sure to initialize it correctly (e.g. IN6ADDR_ANY_INIT).
 3223  *
 3224  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3225  */
 3226 int
 3227 prison_get_ip6(struct ucred *cred, struct in6_addr *ia6)
 3228 {
 3229         struct prison *pr;
 3230 
 3231         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3232         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3233 
 3234         pr = cred->cr_prison;
 3235         if (!(pr->pr_flags & PR_IP6))
 3236                 return (0);
 3237         mtx_lock(&pr->pr_mtx);
 3238         if (!(pr->pr_flags & PR_IP6)) {
 3239                 mtx_unlock(&pr->pr_mtx);
 3240                 return (0);
 3241         }
 3242         if (pr->pr_ip6 == NULL) {
 3243                 mtx_unlock(&pr->pr_mtx);
 3244                 return (EAFNOSUPPORT);
 3245         }
 3246 
 3247         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3248         mtx_unlock(&pr->pr_mtx);
 3249         return (0);
 3250 }
 3251 
 3252 /*
 3253  * Return 1 if we should do proper source address selection or are not jailed.
 3254  * We will return 0 if we should bypass source address selection in favour
 3255  * of the primary jail IPv6 address. Only in this case *ia will be updated and
 3256  * returned in NBO.
 3257  * Return EAFNOSUPPORT, in case this jail does not allow IPv6.
 3258  */
 3259 int
 3260 prison_saddrsel_ip6(struct ucred *cred, struct in6_addr *ia6)
 3261 {
 3262         struct prison *pr;
 3263         struct in6_addr lia6;
 3264         int error;
 3265 
 3266         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3267         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3268 
 3269         if (!jailed(cred))
 3270                 return (1);
 3271 
 3272         pr = cred->cr_prison;
 3273         if (pr->pr_flags & PR_IP6_SADDRSEL)
 3274                 return (1);
 3275 
 3276         lia6 = in6addr_any;
 3277         error = prison_get_ip6(cred, &lia6);
 3278         if (error)
 3279                 return (error);
 3280         if (IN6_IS_ADDR_UNSPECIFIED(&lia6))
 3281                 return (1);
 3282 
 3283         bcopy(&lia6, ia6, sizeof(struct in6_addr));
 3284         return (0);
 3285 }
 3286 
 3287 /*
 3288  * Return true if pr1 and pr2 have the same IPv6 address restrictions.
 3289  */
 3290 int
 3291 prison_equal_ip6(struct prison *pr1, struct prison *pr2)
 3292 {
 3293 
 3294         if (pr1 == pr2)
 3295                 return (1);
 3296 
 3297         while (pr1 != &prison0 &&
 3298 #ifdef VIMAGE
 3299                !(pr1->pr_flags & PR_VNET) &&
 3300 #endif
 3301                !(pr1->pr_flags & PR_IP6_USER))
 3302                 pr1 = pr1->pr_parent;
 3303         while (pr2 != &prison0 &&
 3304 #ifdef VIMAGE
 3305                !(pr2->pr_flags & PR_VNET) &&
 3306 #endif
 3307                !(pr2->pr_flags & PR_IP6_USER))
 3308                 pr2 = pr2->pr_parent;
 3309         return (pr1 == pr2);
 3310 }
 3311 
 3312 /*
 3313  * Make sure our (source) address is set to something meaningful to this jail.
 3314  *
 3315  * v6only should be set based on (inp->inp_flags & IN6P_IPV6_V6ONLY != 0)
 3316  * when needed while binding.
 3317  *
 3318  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3319  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3320  * doesn't allow IPv6.
 3321  */
 3322 int
 3323 prison_local_ip6(struct ucred *cred, struct in6_addr *ia6, int v6only)
 3324 {
 3325         struct prison *pr;
 3326         int error;
 3327 
 3328         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3329         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3330 
 3331         pr = cred->cr_prison;
 3332         if (!(pr->pr_flags & PR_IP6))
 3333                 return (0);
 3334         mtx_lock(&pr->pr_mtx);
 3335         if (!(pr->pr_flags & PR_IP6)) {
 3336                 mtx_unlock(&pr->pr_mtx);
 3337                 return (0);
 3338         }
 3339         if (pr->pr_ip6 == NULL) {
 3340                 mtx_unlock(&pr->pr_mtx);
 3341                 return (EAFNOSUPPORT);
 3342         }
 3343 
 3344         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3345                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3346                 mtx_unlock(&pr->pr_mtx);
 3347                 return (0);
 3348         }
 3349 
 3350         if (IN6_IS_ADDR_UNSPECIFIED(ia6)) {
 3351                 /*
 3352                  * In case there is only 1 IPv6 address, and v6only is true,
 3353                  * then bind directly.
 3354                  */
 3355                 if (v6only != 0 && pr->pr_ip6s == 1)
 3356                         bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3357                 mtx_unlock(&pr->pr_mtx);
 3358                 return (0);
 3359         }
 3360 
 3361         error = _prison_check_ip6(pr, ia6);
 3362         mtx_unlock(&pr->pr_mtx);
 3363         return (error);
 3364 }
 3365 
 3366 /*
 3367  * Rewrite destination address in case we will connect to loopback address.
 3368  *
 3369  * Returns 0 on success, EAFNOSUPPORT if the jail doesn't allow IPv6.
 3370  */
 3371 int
 3372 prison_remote_ip6(struct ucred *cred, struct in6_addr *ia6)
 3373 {
 3374         struct prison *pr;
 3375 
 3376         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3377         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3378 
 3379         pr = cred->cr_prison;
 3380         if (!(pr->pr_flags & PR_IP6))
 3381                 return (0);
 3382         mtx_lock(&pr->pr_mtx);
 3383         if (!(pr->pr_flags & PR_IP6)) {
 3384                 mtx_unlock(&pr->pr_mtx);
 3385                 return (0);
 3386         }
 3387         if (pr->pr_ip6 == NULL) {
 3388                 mtx_unlock(&pr->pr_mtx);
 3389                 return (EAFNOSUPPORT);
 3390         }
 3391 
 3392         if (IN6_IS_ADDR_LOOPBACK(ia6)) {
 3393                 bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
 3394                 mtx_unlock(&pr->pr_mtx);
 3395                 return (0);
 3396         }
 3397 
 3398         /*
 3399          * Return success because nothing had to be changed.
 3400          */
 3401         mtx_unlock(&pr->pr_mtx);
 3402         return (0);
 3403 }
 3404 
 3405 /*
 3406  * Check if given address belongs to the jail referenced by cred/prison.
 3407  *
 3408  * Returns 0 if jail doesn't restrict IPv6 or if address belongs to jail,
 3409  * EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if the jail
 3410  * doesn't allow IPv6.
 3411  */
 3412 static int
 3413 _prison_check_ip6(struct prison *pr, struct in6_addr *ia6)
 3414 {
 3415         int i, a, z, d;
 3416 
 3417         /*
 3418          * Check the primary IP.
 3419          */
 3420         if (IN6_ARE_ADDR_EQUAL(&pr->pr_ip6[0], ia6))
 3421                 return (0);
 3422 
 3423         /*
 3424          * All the other IPs are sorted so we can do a binary search.
 3425          */
 3426         a = 0;
 3427         z = pr->pr_ip6s - 2;
 3428         while (a <= z) {
 3429                 i = (a + z) / 2;
 3430                 d = qcmp_v6(&pr->pr_ip6[i+1], ia6);
 3431                 if (d > 0)
 3432                         z = i - 1;
 3433                 else if (d < 0)
 3434                         a = i + 1;
 3435                 else
 3436                         return (0);
 3437         }
 3438 
 3439         return (EADDRNOTAVAIL);
 3440 }
 3441 
 3442 int
 3443 prison_check_ip6(struct ucred *cred, struct in6_addr *ia6)
 3444 {
 3445         struct prison *pr;
 3446         int error;
 3447 
 3448         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3449         KASSERT(ia6 != NULL, ("%s: ia6 is NULL", __func__));
 3450 
 3451         pr = cred->cr_prison;
 3452         if (!(pr->pr_flags & PR_IP6))
 3453                 return (0);
 3454         mtx_lock(&pr->pr_mtx);
 3455         if (!(pr->pr_flags & PR_IP6)) {
 3456                 mtx_unlock(&pr->pr_mtx);
 3457                 return (0);
 3458         }
 3459         if (pr->pr_ip6 == NULL) {
 3460                 mtx_unlock(&pr->pr_mtx);
 3461                 return (EAFNOSUPPORT);
 3462         }
 3463 
 3464         error = _prison_check_ip6(pr, ia6);
 3465         mtx_unlock(&pr->pr_mtx);
 3466         return (error);
 3467 }
 3468 #endif
 3469 
 3470 /*
 3471  * Check if a jail supports the given address family.
 3472  *
 3473  * Returns 0 if not jailed or the address family is supported, EAFNOSUPPORT
 3474  * if not.
 3475  */
 3476 int
 3477 prison_check_af(struct ucred *cred, int af)
 3478 {
 3479         struct prison *pr;
 3480         int error;
 3481 
 3482         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3483 
 3484         pr = cred->cr_prison;
 3485 #ifdef VIMAGE
 3486         /* Prisons with their own network stack are not limited. */
 3487         if (prison_owns_vnet(cred))
 3488                 return (0);
 3489 #endif
 3490 
 3491         error = 0;
 3492         switch (af)
 3493         {
 3494 #ifdef INET
 3495         case AF_INET:
 3496                 if (pr->pr_flags & PR_IP4)
 3497                 {
 3498                         mtx_lock(&pr->pr_mtx);
 3499                         if ((pr->pr_flags & PR_IP4) && pr->pr_ip4 == NULL)
 3500                                 error = EAFNOSUPPORT;
 3501                         mtx_unlock(&pr->pr_mtx);
 3502                 }
 3503                 break;
 3504 #endif
 3505 #ifdef INET6
 3506         case AF_INET6:
 3507                 if (pr->pr_flags & PR_IP6)
 3508                 {
 3509                         mtx_lock(&pr->pr_mtx);
 3510                         if ((pr->pr_flags & PR_IP6) && pr->pr_ip6 == NULL)
 3511                                 error = EAFNOSUPPORT;
 3512                         mtx_unlock(&pr->pr_mtx);
 3513                 }
 3514                 break;
 3515 #endif
 3516         case AF_LOCAL:
 3517         case AF_ROUTE:
 3518                 break;
 3519         default:
 3520                 if (!(pr->pr_allow & PR_ALLOW_SOCKET_AF))
 3521                         error = EAFNOSUPPORT;
 3522         }
 3523         return (error);
 3524 }
 3525 
 3526 /*
 3527  * Check if given address belongs to the jail referenced by cred (wrapper to
 3528  * prison_check_ip[46]).
 3529  *
 3530  * Returns 0 if jail doesn't restrict the address family or if address belongs
 3531  * to jail, EADDRNOTAVAIL if the address doesn't belong, or EAFNOSUPPORT if
 3532  * the jail doesn't allow the address family.  IPv4 Address passed in in NBO.
 3533  */
 3534 int
 3535 prison_if(struct ucred *cred, struct sockaddr *sa)
 3536 {
 3537 #ifdef INET
 3538         struct sockaddr_in *sai;
 3539 #endif
 3540 #ifdef INET6
 3541         struct sockaddr_in6 *sai6;
 3542 #endif
 3543         int error;
 3544 
 3545         KASSERT(cred != NULL, ("%s: cred is NULL", __func__));
 3546         KASSERT(sa != NULL, ("%s: sa is NULL", __func__));
 3547 
 3548 #ifdef VIMAGE
 3549         if (prison_owns_vnet(cred))
 3550                 return (0);
 3551 #endif
 3552 
 3553         error = 0;
 3554         switch (sa->sa_family)
 3555         {
 3556 #ifdef INET
 3557         case AF_INET:
 3558                 sai = (struct sockaddr_in *)sa;
 3559                 error = prison_check_ip4(cred, &sai->sin_addr);
 3560                 break;
 3561 #endif
 3562 #ifdef INET6
 3563         case AF_INET6:
 3564                 sai6 = (struct sockaddr_in6 *)sa;
 3565                 error = prison_check_ip6(cred, &sai6->sin6_addr);
 3566                 break;
 3567 #endif
 3568         default:
 3569                 if (!(cred->cr_prison->pr_allow & PR_ALLOW_SOCKET_AF))
 3570                         error = EAFNOSUPPORT;
 3571         }
 3572         return (error);
 3573 }
 3574 
 3575 /*
 3576  * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
 3577  */
 3578 int
 3579 prison_check(struct ucred *cred1, struct ucred *cred2)
 3580 {
 3581 
 3582         return ((cred1->cr_prison == cred2->cr_prison ||
 3583             prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
 3584 }
 3585 
 3586 /*
 3587  * Return 1 if p2 is a child of p1, otherwise 0.
 3588  */
 3589 int
 3590 prison_ischild(struct prison *pr1, struct prison *pr2)
 3591 {
 3592 
 3593         for (pr2 = pr2->pr_parent; pr2 != NULL; pr2 = pr2->pr_parent)
 3594                 if (pr1 == pr2)
 3595                         return (1);
 3596         return (0);
 3597 }
 3598 
 3599 /*
 3600  * Return 1 if the passed credential is in a jail, otherwise 0.
 3601  */
 3602 int
 3603 jailed(struct ucred *cred)
 3604 {
 3605 
 3606         return (cred->cr_prison != &prison0);
 3607 }
 3608 
 3609 /*
 3610  * Return 1 if the passed credential is in a jail and that jail does not
 3611  * have its own virtual network stack, otherwise 0.
 3612  */
 3613 int
 3614 jailed_without_vnet(struct ucred *cred)
 3615 {
 3616 
 3617         if (!jailed(cred))
 3618                 return (0);
 3619 #ifdef VIMAGE
 3620         if (prison_owns_vnet(cred))
 3621                 return (0);
 3622 #endif
 3623 
 3624         return (1);
 3625 }
 3626 
 3627 /*
 3628  * Return the correct hostname (domainname, et al) for the passed credential.
 3629  */
 3630 void
 3631 getcredhostname(struct ucred *cred, char *buf, size_t size)
 3632 {
 3633         struct prison *pr;
 3634 
 3635         /*
 3636          * A NULL credential can be used to shortcut to the physical
 3637          * system's hostname.
 3638          */
 3639         pr = (cred != NULL) ? cred->cr_prison : &prison0;
 3640         mtx_lock(&pr->pr_mtx);
 3641         strlcpy(buf, pr->pr_hostname, size);
 3642         mtx_unlock(&pr->pr_mtx);
 3643 }
 3644 
 3645 void
 3646 getcreddomainname(struct ucred *cred, char *buf, size_t size)
 3647 {
 3648 
 3649         mtx_lock(&cred->cr_prison->pr_mtx);
 3650         strlcpy(buf, cred->cr_prison->pr_domainname, size);
 3651         mtx_unlock(&cred->cr_prison->pr_mtx);
 3652 }
 3653 
 3654 void
 3655 getcredhostuuid(struct ucred *cred, char *buf, size_t size)
 3656 {
 3657 
 3658         mtx_lock(&cred->cr_prison->pr_mtx);
 3659         strlcpy(buf, cred->cr_prison->pr_hostuuid, size);
 3660         mtx_unlock(&cred->cr_prison->pr_mtx);
 3661 }
 3662 
 3663 void
 3664 getcredhostid(struct ucred *cred, unsigned long *hostid)
 3665 {
 3666 
 3667         mtx_lock(&cred->cr_prison->pr_mtx);
 3668         *hostid = cred->cr_prison->pr_hostid;
 3669         mtx_unlock(&cred->cr_prison->pr_mtx);
 3670 }
 3671 
 3672 #ifdef VIMAGE
 3673 /*
 3674  * Determine whether the prison represented by cred owns
 3675  * its vnet rather than having it inherited.
 3676  *
 3677  * Returns 1 in case the prison owns the vnet, 0 otherwise.
 3678  */
 3679 int
 3680 prison_owns_vnet(struct ucred *cred)
 3681 {
 3682 
 3683         /*
 3684          * vnets cannot be added/removed after jail creation,
 3685          * so no need to lock here.
 3686          */
 3687         return (cred->cr_prison->pr_flags & PR_VNET ? 1 : 0);
 3688 }
 3689 #endif
 3690 
 3691 /*
 3692  * Determine whether the subject represented by cred can "see"
 3693  * status of a mount point.
 3694  * Returns: 0 for permitted, ENOENT otherwise.
 3695  * XXX: This function should be called cr_canseemount() and should be
 3696  *      placed in kern_prot.c.
 3697  */
 3698 int
 3699 prison_canseemount(struct ucred *cred, struct mount *mp)
 3700 {
 3701         struct prison *pr;
 3702         struct statfs *sp;
 3703         size_t len;
 3704 
 3705         pr = cred->cr_prison;
 3706         if (pr->pr_enforce_statfs == 0)
 3707                 return (0);
 3708         if (pr->pr_root->v_mount == mp)
 3709                 return (0);
 3710         if (pr->pr_enforce_statfs == 2)
 3711                 return (ENOENT);
 3712         /*
 3713          * If jail's chroot directory is set to "/" we should be able to see
 3714          * all mount-points from inside a jail.
 3715          * This is ugly check, but this is the only situation when jail's
 3716          * directory ends with '/'.
 3717          */
 3718         if (strcmp(pr->pr_path, "/") == 0)
 3719                 return (0);
 3720         len = strlen(pr->pr_path);
 3721         sp = &mp->mnt_stat;
 3722         if (strncmp(pr->pr_path, sp->f_mntonname, len) != 0)
 3723                 return (ENOENT);
 3724         /*
 3725          * Be sure that we don't have situation where jail's root directory
 3726          * is "/some/path" and mount point is "/some/pathpath".
 3727          */
 3728         if (sp->f_mntonname[len] != '\0' && sp->f_mntonname[len] != '/')
 3729                 return (ENOENT);
 3730         return (0);
 3731 }
 3732 
 3733 void
 3734 prison_enforce_statfs(struct ucred *cred, struct mount *mp, struct statfs *sp)
 3735 {
 3736         char jpath[MAXPATHLEN];
 3737         struct prison *pr;
 3738         size_t len;
 3739 
 3740         pr = cred->cr_prison;
 3741         if (pr->pr_enforce_statfs == 0)
 3742                 return;
 3743         if (prison_canseemount(cred, mp) != 0) {
 3744                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3745                 strlcpy(sp->f_mntonname, "[restricted]",
 3746                     sizeof(sp->f_mntonname));
 3747                 return;
 3748         }
 3749         if (pr->pr_root->v_mount == mp) {
 3750                 /*
 3751                  * Clear current buffer data, so we are sure nothing from
 3752                  * the valid path left there.
 3753                  */
 3754                 bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3755                 *sp->f_mntonname = '/';
 3756                 return;
 3757         }
 3758         /*
 3759          * If jail's chroot directory is set to "/" we should be able to see
 3760          * all mount-points from inside a jail.
 3761          */
 3762         if (strcmp(pr->pr_path, "/") == 0)
 3763                 return;
 3764         len = strlen(pr->pr_path);
 3765         strlcpy(jpath, sp->f_mntonname + len, sizeof(jpath));
 3766         /*
 3767          * Clear current buffer data, so we are sure nothing from
 3768          * the valid path left there.
 3769          */
 3770         bzero(sp->f_mntonname, sizeof(sp->f_mntonname));
 3771         if (*jpath == '\0') {
 3772                 /* Should never happen. */
 3773                 *sp->f_mntonname = '/';
 3774         } else {
 3775                 strlcpy(sp->f_mntonname, jpath, sizeof(sp->f_mntonname));
 3776         }
 3777 }
 3778 
 3779 /*
 3780  * Check with permission for a specific privilege is granted within jail.  We
 3781  * have a specific list of accepted privileges; the rest are denied.
 3782  */
 3783 int
 3784 prison_priv_check(struct ucred *cred, int priv)
 3785 {
 3786 
 3787         if (!jailed(cred))
 3788                 return (0);
 3789 
 3790 #ifdef VIMAGE
 3791         /*
 3792          * Privileges specific to prisons with a virtual network stack.
 3793          * There might be a duplicate entry here in case the privilege
 3794          * is only granted conditionally in the legacy jail case.
 3795          */
 3796         switch (priv) {
 3797 #ifdef notyet
 3798                 /*
 3799                  * NFS-specific privileges.
 3800                  */
 3801         case PRIV_NFS_DAEMON:
 3802         case PRIV_NFS_LOCKD:
 3803 #endif
 3804                 /*
 3805                  * Network stack privileges.
 3806                  */
 3807         case PRIV_NET_BRIDGE:
 3808         case PRIV_NET_GRE:
 3809         case PRIV_NET_BPF:
 3810         case PRIV_NET_RAW:              /* Dup, cond. in legacy jail case. */
 3811         case PRIV_NET_ROUTE:
 3812         case PRIV_NET_TAP:
 3813         case PRIV_NET_SETIFMTU:
 3814         case PRIV_NET_SETIFFLAGS:
 3815         case PRIV_NET_SETIFCAP:
 3816         case PRIV_NET_SETIFDESCR:
 3817         case PRIV_NET_SETIFNAME :
 3818         case PRIV_NET_SETIFMETRIC:
 3819         case PRIV_NET_SETIFPHYS:
 3820         case PRIV_NET_SETIFMAC:
 3821         case PRIV_NET_ADDMULTI:
 3822         case PRIV_NET_DELMULTI:
 3823         case PRIV_NET_HWIOCTL:
 3824         case PRIV_NET_SETLLADDR:
 3825         case PRIV_NET_ADDIFGROUP:
 3826         case PRIV_NET_DELIFGROUP:
 3827         case PRIV_NET_IFCREATE:
 3828         case PRIV_NET_IFDESTROY:
 3829         case PRIV_NET_ADDIFADDR:
 3830         case PRIV_NET_DELIFADDR:
 3831         case PRIV_NET_LAGG:
 3832         case PRIV_NET_GIF:
 3833         case PRIV_NET_SETIFVNET:
 3834         case PRIV_NET_SETIFFIB:
 3835 
 3836                 /*
 3837                  * 802.11-related privileges.
 3838                  */
 3839         case PRIV_NET80211_GETKEY:
 3840 #ifdef notyet
 3841         case PRIV_NET80211_MANAGE:              /* XXX-BZ discuss with sam@ */
 3842 #endif
 3843 
 3844 #ifdef notyet
 3845                 /*
 3846                  * AppleTalk privileges.
 3847                  */
 3848         case PRIV_NETATALK_RESERVEDPORT:
 3849 
 3850                 /*
 3851                  * ATM privileges.
 3852                  */
 3853         case PRIV_NETATM_CFG:
 3854         case PRIV_NETATM_ADD:
 3855         case PRIV_NETATM_DEL:
 3856         case PRIV_NETATM_SET:
 3857 
 3858                 /*
 3859                  * Bluetooth privileges.
 3860                  */
 3861         case PRIV_NETBLUETOOTH_RAW:
 3862 #endif
 3863 
 3864                 /*
 3865                  * Netgraph and netgraph module privileges.
 3866                  */
 3867         case PRIV_NETGRAPH_CONTROL:
 3868 #ifdef notyet
 3869         case PRIV_NETGRAPH_TTY:
 3870 #endif
 3871 
 3872                 /*
 3873                  * IPv4 and IPv6 privileges.
 3874                  */
 3875         case PRIV_NETINET_IPFW:
 3876         case PRIV_NETINET_DIVERT:
 3877         case PRIV_NETINET_PF:
 3878         case PRIV_NETINET_DUMMYNET:
 3879         case PRIV_NETINET_CARP:
 3880         case PRIV_NETINET_MROUTE:
 3881         case PRIV_NETINET_RAW:
 3882         case PRIV_NETINET_ADDRCTRL6:
 3883         case PRIV_NETINET_ND6:
 3884         case PRIV_NETINET_SCOPE6:
 3885         case PRIV_NETINET_ALIFETIME6:
 3886         case PRIV_NETINET_IPSEC:
 3887         case PRIV_NETINET_BINDANY:
 3888 
 3889 #ifdef notyet
 3890                 /*
 3891                  * IPX/SPX privileges.
 3892                  */
 3893         case PRIV_NETIPX_RESERVEDPORT:
 3894         case PRIV_NETIPX_RAW:
 3895 
 3896                 /*
 3897                  * NCP privileges.
 3898                  */
 3899         case PRIV_NETNCP:
 3900 
 3901                 /*
 3902                  * SMB privileges.
 3903                  */
 3904         case PRIV_NETSMB:
 3905 #endif
 3906 
 3907         /*
 3908          * No default: or deny here.
 3909          * In case of no permit fall through to next switch().
 3910          */
 3911                 if (cred->cr_prison->pr_flags & PR_VNET)
 3912                         return (0);
 3913         }
 3914 #endif /* VIMAGE */
 3915 
 3916         switch (priv) {
 3917 
 3918                 /*
 3919                  * Allow ktrace privileges for root in jail.
 3920                  */
 3921         case PRIV_KTRACE:
 3922 
 3923 #if 0
 3924                 /*
 3925                  * Allow jailed processes to configure audit identity and
 3926                  * submit audit records (login, etc).  In the future we may
 3927                  * want to further refine the relationship between audit and
 3928                  * jail.
 3929                  */
 3930         case PRIV_AUDIT_GETAUDIT:
 3931         case PRIV_AUDIT_SETAUDIT:
 3932         case PRIV_AUDIT_SUBMIT:
 3933 #endif
 3934 
 3935                 /*
 3936                  * Allow jailed processes to manipulate process UNIX
 3937                  * credentials in any way they see fit.
 3938                  */
 3939         case PRIV_CRED_SETUID:
 3940         case PRIV_CRED_SETEUID:
 3941         case PRIV_CRED_SETGID:
 3942         case PRIV_CRED_SETEGID:
 3943         case PRIV_CRED_SETGROUPS:
 3944         case PRIV_CRED_SETREUID:
 3945         case PRIV_CRED_SETREGID:
 3946         case PRIV_CRED_SETRESUID:
 3947         case PRIV_CRED_SETRESGID:
 3948 
 3949                 /*
 3950                  * Jail implements visibility constraints already, so allow
 3951                  * jailed root to override uid/gid-based constraints.
 3952                  */
 3953         case PRIV_SEEOTHERGIDS:
 3954         case PRIV_SEEOTHERUIDS:
 3955 
 3956                 /*
 3957                  * Jail implements inter-process debugging limits already, so
 3958                  * allow jailed root various debugging privileges.
 3959                  */
 3960         case PRIV_DEBUG_DIFFCRED:
 3961         case PRIV_DEBUG_SUGID:
 3962         case PRIV_DEBUG_UNPRIV:
 3963 
 3964                 /*
 3965                  * Allow jail to set various resource limits and login
 3966                  * properties, and for now, exceed process resource limits.
 3967                  */
 3968         case PRIV_PROC_LIMIT:
 3969         case PRIV_PROC_SETLOGIN:
 3970         case PRIV_PROC_SETRLIMIT:
 3971 
 3972                 /*
 3973                  * System V and POSIX IPC privileges are granted in jail.
 3974                  */
 3975         case PRIV_IPC_READ:
 3976         case PRIV_IPC_WRITE:
 3977         case PRIV_IPC_ADMIN:
 3978         case PRIV_IPC_MSGSIZE:
 3979         case PRIV_MQ_ADMIN:
 3980 
 3981                 /*
 3982                  * Jail operations within a jail work on child jails.
 3983                  */
 3984         case PRIV_JAIL_ATTACH:
 3985         case PRIV_JAIL_SET:
 3986         case PRIV_JAIL_REMOVE:
 3987 
 3988                 /*
 3989                  * Jail implements its own inter-process limits, so allow
 3990                  * root processes in jail to change scheduling on other
 3991                  * processes in the same jail.  Likewise for signalling.
 3992                  */
 3993         case PRIV_SCHED_DIFFCRED:
 3994         case PRIV_SCHED_CPUSET:
 3995         case PRIV_SIGNAL_DIFFCRED:
 3996         case PRIV_SIGNAL_SUGID:
 3997 
 3998                 /*
 3999                  * Allow jailed processes to write to sysctls marked as jail
 4000                  * writable.
 4001                  */
 4002         case PRIV_SYSCTL_WRITEJAIL:
 4003 
 4004                 /*
 4005                  * Allow root in jail to manage a variety of quota
 4006                  * properties.  These should likely be conditional on a
 4007                  * configuration option.
 4008                  */
 4009         case PRIV_VFS_GETQUOTA:
 4010         case PRIV_VFS_SETQUOTA:
 4011 
 4012                 /*
 4013                  * Since Jail relies on chroot() to implement file system
 4014                  * protections, grant many VFS privileges to root in jail.
 4015                  * Be careful to exclude mount-related and NFS-related
 4016                  * privileges.
 4017                  */
 4018         case PRIV_VFS_READ:
 4019         case PRIV_VFS_WRITE:
 4020         case PRIV_VFS_ADMIN:
 4021         case PRIV_VFS_EXEC:
 4022         case PRIV_VFS_LOOKUP:
 4023         case PRIV_VFS_BLOCKRESERVE:     /* XXXRW: Slightly surprising. */
 4024         case PRIV_VFS_CHFLAGS_DEV:
 4025         case PRIV_VFS_CHOWN:
 4026         case PRIV_VFS_CHROOT:
 4027         case PRIV_VFS_RETAINSUGID:
 4028         case PRIV_VFS_FCHROOT:
 4029         case PRIV_VFS_LINK:
 4030         case PRIV_VFS_SETGID:
 4031         case PRIV_VFS_STAT:
 4032         case PRIV_VFS_STICKYFILE:
 4033 
 4034                 /*
 4035                  * As in the non-jail case, non-root users are expected to be
 4036                  * able to read kernel/phyiscal memory (provided /dev/[k]mem
 4037                  * exists in the jail and they have permission to access it).
 4038                  */
 4039         case PRIV_KMEM_READ:
 4040                 return (0);
 4041 
 4042                 /*
 4043                  * Depending on the global setting, allow privilege of
 4044                  * setting system flags.
 4045                  */
 4046         case PRIV_VFS_SYSFLAGS:
 4047                 if (cred->cr_prison->pr_allow & PR_ALLOW_CHFLAGS)
 4048                         return (0);
 4049                 else
 4050                         return (EPERM);
 4051 
 4052                 /*
 4053                  * Depending on the global setting, allow privilege of
 4054                  * mounting/unmounting file systems.
 4055                  */
 4056         case PRIV_VFS_MOUNT:
 4057         case PRIV_VFS_UNMOUNT:
 4058         case PRIV_VFS_MOUNT_NONUSER:
 4059         case PRIV_VFS_MOUNT_OWNER:
 4060                 if (cred->cr_prison->pr_allow & PR_ALLOW_MOUNT &&
 4061                     cred->cr_prison->pr_enforce_statfs < 2)
 4062                         return (0);
 4063                 else
 4064                         return (EPERM);
 4065 
 4066                 /*
 4067                  * Allow jailed root to bind reserved ports and reuse in-use
 4068                  * ports.
 4069                  */
 4070         case PRIV_NETINET_RESERVEDPORT:
 4071         case PRIV_NETINET_REUSEPORT:
 4072                 return (0);
 4073 
 4074                 /*
 4075                  * Allow jailed root to set certain IPv4/6 (option) headers.
 4076                  */
 4077         case PRIV_NETINET_SETHDROPTS:
 4078                 return (0);
 4079 
 4080                 /*
 4081                  * Conditionally allow creating raw sockets in jail.
 4082                  */
 4083         case PRIV_NETINET_RAW:
 4084                 if (cred->cr_prison->pr_allow & PR_ALLOW_RAW_SOCKETS)
 4085                         return (0);
 4086                 else
 4087                         return (EPERM);
 4088 
 4089                 /*
 4090                  * Since jail implements its own visibility limits on netstat
 4091                  * sysctls, allow getcred.  This allows identd to work in
 4092                  * jail.
 4093                  */
 4094         case PRIV_NETINET_GETCRED:
 4095                 return (0);
 4096 
 4097                 /*
 4098                  * Allow jailed root to set loginclass.
 4099                  */
 4100         case PRIV_PROC_SETLOGINCLASS:
 4101                 return (0);
 4102 
 4103         default:
 4104                 /*
 4105                  * In all remaining cases, deny the privilege request.  This
 4106                  * includes almost all network privileges, many system
 4107                  * configuration privileges.
 4108                  */
 4109                 return (EPERM);
 4110         }
 4111 }
 4112 
 4113 /*
 4114  * Return the part of pr2's name that is relative to pr1, or the whole name
 4115  * if it does not directly follow.
 4116  */
 4117 
 4118 char *
 4119 prison_name(struct prison *pr1, struct prison *pr2)
 4120 {
 4121         char *name;
 4122 
 4123         /* Jails see themselves as "" (if they see themselves at all). */
 4124         if (pr1 == pr2)
 4125                 return "";
 4126         name = pr2->pr_name;
 4127         if (prison_ischild(pr1, pr2)) {
 4128                 /*
 4129                  * pr1 isn't locked (and allprison_lock may not be either)
 4130                  * so its length can't be counted on.  But the number of dots
 4131                  * can be counted on - and counted.
 4132                  */
 4133                 for (; pr1 != &prison0; pr1 = pr1->pr_parent)
 4134                         name = strchr(name, '.') + 1;
 4135         }
 4136         return (name);
 4137 }
 4138 
 4139 /*
 4140  * Return the part of pr2's path that is relative to pr1, or the whole path
 4141  * if it does not directly follow.
 4142  */
 4143 static char *
 4144 prison_path(struct prison *pr1, struct prison *pr2)
 4145 {
 4146         char *path1, *path2;
 4147         int len1;
 4148 
 4149         path1 = pr1->pr_path;
 4150         path2 = pr2->pr_path;
 4151         if (!strcmp(path1, "/"))
 4152                 return (path2);
 4153         len1 = strlen(path1);
 4154         if (strncmp(path1, path2, len1))
 4155                 return (path2);
 4156         if (path2[len1] == '\0')
 4157                 return "/";
 4158         if (path2[len1] == '/')
 4159                 return (path2 + len1);
 4160         return (path2);
 4161 }
 4162 
 4163 
 4164 /*
 4165  * Jail-related sysctls.
 4166  */
 4167 static SYSCTL_NODE(_security, OID_AUTO, jail, CTLFLAG_RW, 0,
 4168     "Jails");
 4169 
 4170 static int
 4171 sysctl_jail_list(SYSCTL_HANDLER_ARGS)
 4172 {
 4173         struct xprison *xp;
 4174         struct prison *pr, *cpr;
 4175 #ifdef INET
 4176         struct in_addr *ip4 = NULL;
 4177         int ip4s = 0;
 4178 #endif
 4179 #ifdef INET6
 4180         struct in6_addr *ip6 = NULL;
 4181         int ip6s = 0;
 4182 #endif
 4183         int descend, error;
 4184 
 4185         xp = malloc(sizeof(*xp), M_TEMP, M_WAITOK);
 4186         pr = req->td->td_ucred->cr_prison;
 4187         error = 0;
 4188         sx_slock(&allprison_lock);
 4189         FOREACH_PRISON_DESCENDANT(pr, cpr, descend) {
 4190 #if defined(INET) || defined(INET6)
 4191  again:
 4192 #endif
 4193                 mtx_lock(&cpr->pr_mtx);
 4194 #ifdef INET
 4195                 if (cpr->pr_ip4s > 0) {
 4196                         if (ip4s < cpr->pr_ip4s) {
 4197                                 ip4s = cpr->pr_ip4s;
 4198                                 mtx_unlock(&cpr->pr_mtx);
 4199                                 ip4 = realloc(ip4, ip4s *
 4200                                     sizeof(struct in_addr), M_TEMP, M_WAITOK);
 4201                                 goto again;
 4202                         }
 4203                         bcopy(cpr->pr_ip4, ip4,
 4204                             cpr->pr_ip4s * sizeof(struct in_addr));
 4205                 }
 4206 #endif
 4207 #ifdef INET6
 4208                 if (cpr->pr_ip6s > 0) {
 4209                         if (ip6s < cpr->pr_ip6s) {
 4210                                 ip6s = cpr->pr_ip6s;
 4211                                 mtx_unlock(&cpr->pr_mtx);
 4212                                 ip6 = realloc(ip6, ip6s *
 4213                                     sizeof(struct in6_addr), M_TEMP, M_WAITOK);
 4214                                 goto again;
 4215                         }
 4216                         bcopy(cpr->pr_ip6, ip6,
 4217                             cpr->pr_ip6s * sizeof(struct in6_addr));
 4218                 }
 4219 #endif
 4220                 if (cpr->pr_ref == 0) {
 4221                         mtx_unlock(&cpr->pr_mtx);
 4222                         continue;
 4223                 }
 4224                 bzero(xp, sizeof(*xp));
 4225                 xp->pr_version = XPRISON_VERSION;
 4226                 xp->pr_id = cpr->pr_id;
 4227                 xp->pr_state = cpr->pr_uref > 0
 4228                     ? PRISON_STATE_ALIVE : PRISON_STATE_DYING;
 4229                 strlcpy(xp->pr_path, prison_path(pr, cpr), sizeof(xp->pr_path));
 4230                 strlcpy(xp->pr_host, cpr->pr_hostname, sizeof(xp->pr_host));
 4231                 strlcpy(xp->pr_name, prison_name(pr, cpr), sizeof(xp->pr_name));
 4232 #ifdef INET
 4233                 xp->pr_ip4s = cpr->pr_ip4s;
 4234 #endif
 4235 #ifdef INET6
 4236                 xp->pr_ip6s = cpr->pr_ip6s;
 4237 #endif
 4238                 mtx_unlock(&cpr->pr_mtx);
 4239                 error = SYSCTL_OUT(req, xp, sizeof(*xp));
 4240                 if (error)
 4241                         break;
 4242 #ifdef INET
 4243                 if (xp->pr_ip4s > 0) {
 4244                         error = SYSCTL_OUT(req, ip4,
 4245                             xp->pr_ip4s * sizeof(struct in_addr));
 4246                         if (error)
 4247                                 break;
 4248                 }
 4249 #endif
 4250 #ifdef INET6
 4251                 if (xp->pr_ip6s > 0) {
 4252                         error = SYSCTL_OUT(req, ip6,
 4253                             xp->pr_ip6s * sizeof(struct in6_addr));
 4254                         if (error)
 4255                                 break;
 4256                 }
 4257 #endif
 4258         }
 4259         sx_sunlock(&allprison_lock);
 4260         free(xp, M_TEMP);
 4261 #ifdef INET
 4262         free(ip4, M_TEMP);
 4263 #endif
 4264 #ifdef INET6
 4265         free(ip6, M_TEMP);
 4266 #endif
 4267         return (error);
 4268 }
 4269 
 4270 SYSCTL_OID(_security_jail, OID_AUTO, list,
 4271     CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4272     sysctl_jail_list, "S", "List of active jails");
 4273 
 4274 static int
 4275 sysctl_jail_jailed(SYSCTL_HANDLER_ARGS)
 4276 {
 4277         int error, injail;
 4278 
 4279         injail = jailed(req->td->td_ucred);
 4280         error = SYSCTL_OUT(req, &injail, sizeof(injail));
 4281 
 4282         return (error);
 4283 }
 4284 
 4285 SYSCTL_PROC(_security_jail, OID_AUTO, jailed,
 4286     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4287     sysctl_jail_jailed, "I", "Process in jail?");
 4288 
 4289 static int
 4290 sysctl_jail_vnet(SYSCTL_HANDLER_ARGS)
 4291 {
 4292         int error, havevnet;
 4293 #ifdef VIMAGE
 4294         struct ucred *cred = req->td->td_ucred;
 4295 
 4296         havevnet = jailed(cred) && prison_owns_vnet(cred);
 4297 #else
 4298         havevnet = 0;
 4299 #endif
 4300         error = SYSCTL_OUT(req, &havevnet, sizeof(havevnet));
 4301 
 4302         return (error);
 4303 }
 4304 
 4305 SYSCTL_PROC(_security_jail, OID_AUTO, vnet,
 4306     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 4307     sysctl_jail_vnet, "I", "Jail owns VNET?");
 4308 
 4309 #if defined(INET) || defined(INET6)
 4310 SYSCTL_UINT(_security_jail, OID_AUTO, jail_max_af_ips, CTLFLAG_RW,
 4311     &jail_max_af_ips, 0,
 4312     "Number of IP addresses a jail may have at most per address family (deprecated)");
 4313 #endif
 4314 
 4315 /*
 4316  * Default parameters for jail(2) compatibility.  For historical reasons,
 4317  * the sysctl names have varying similarity to the parameter names.  Prisons
 4318  * just see their own parameters, and can't change them.
 4319  */
 4320 static int
 4321 sysctl_jail_default_allow(SYSCTL_HANDLER_ARGS)
 4322 {
 4323         struct prison *pr;
 4324         int allow, error, i;
 4325 
 4326         pr = req->td->td_ucred->cr_prison;
 4327         allow = (pr == &prison0) ? jail_default_allow : pr->pr_allow;
 4328 
 4329         /* Get the current flag value, and convert it to a boolean. */
 4330         i = (allow & arg2) ? 1 : 0;
 4331         if (arg1 != NULL)
 4332                 i = !i;
 4333         error = sysctl_handle_int(oidp, &i, 0, req);
 4334         if (error || !req->newptr)
 4335                 return (error);
 4336         i = i ? arg2 : 0;
 4337         if (arg1 != NULL)
 4338                 i ^= arg2;
 4339         /*
 4340          * The sysctls don't have CTLFLAGS_PRISON, so assume prison0
 4341          * for writing.
 4342          */
 4343         mtx_lock(&prison0.pr_mtx);
 4344         jail_default_allow = (jail_default_allow & ~arg2) | i;
 4345         mtx_unlock(&prison0.pr_mtx);
 4346         return (0);
 4347 }
 4348 
 4349 SYSCTL_PROC(_security_jail, OID_AUTO, set_hostname_allowed,
 4350     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4351     NULL, PR_ALLOW_SET_HOSTNAME, sysctl_jail_default_allow, "I",
 4352     "Processes in jail can set their hostnames (deprecated)");
 4353 SYSCTL_PROC(_security_jail, OID_AUTO, socket_unixiproute_only,
 4354     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4355     (void *)1, PR_ALLOW_SOCKET_AF, sysctl_jail_default_allow, "I",
 4356     "Processes in jail are limited to creating UNIX/IP/route sockets only (deprecated)");
 4357 SYSCTL_PROC(_security_jail, OID_AUTO, sysvipc_allowed,
 4358     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4359     NULL, PR_ALLOW_SYSVIPC, sysctl_jail_default_allow, "I",
 4360     "Processes in jail can use System V IPC primitives (deprecated)");
 4361 SYSCTL_PROC(_security_jail, OID_AUTO, allow_raw_sockets,
 4362     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4363     NULL, PR_ALLOW_RAW_SOCKETS, sysctl_jail_default_allow, "I",
 4364     "Prison root can create raw sockets (deprecated)");
 4365 SYSCTL_PROC(_security_jail, OID_AUTO, chflags_allowed,
 4366     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4367     NULL, PR_ALLOW_CHFLAGS, sysctl_jail_default_allow, "I",
 4368     "Processes in jail can alter system file flags (deprecated)");
 4369 SYSCTL_PROC(_security_jail, OID_AUTO, mount_allowed,
 4370     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4371     NULL, PR_ALLOW_MOUNT, sysctl_jail_default_allow, "I",
 4372     "Processes in jail can mount/unmount jail-friendly file systems (deprecated)");
 4373 SYSCTL_PROC(_security_jail, OID_AUTO, mount_devfs_allowed,
 4374     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4375     NULL, PR_ALLOW_MOUNT_DEVFS, sysctl_jail_default_allow, "I",
 4376     "Processes in jail can mount the devfs file system (deprecated)");
 4377 SYSCTL_PROC(_security_jail, OID_AUTO, mount_fdescfs_allowed,
 4378     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4379     NULL, PR_ALLOW_MOUNT_FDESCFS, sysctl_jail_default_allow, "I",
 4380     "Processes in jail can mount the fdescfs file system (deprecated)");
 4381 SYSCTL_PROC(_security_jail, OID_AUTO, mount_nullfs_allowed,
 4382     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4383     NULL, PR_ALLOW_MOUNT_NULLFS, sysctl_jail_default_allow, "I",
 4384     "Processes in jail can mount the nullfs file system (deprecated)");
 4385 SYSCTL_PROC(_security_jail, OID_AUTO, mount_procfs_allowed,
 4386     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4387     NULL, PR_ALLOW_MOUNT_PROCFS, sysctl_jail_default_allow, "I",
 4388     "Processes in jail can mount the procfs file system (deprecated)");
 4389 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linprocfs_allowed,
 4390     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4391     NULL, PR_ALLOW_MOUNT_LINPROCFS, sysctl_jail_default_allow, "I",
 4392     "Processes in jail can mount the linprocfs file system (deprecated)");
 4393 SYSCTL_PROC(_security_jail, OID_AUTO, mount_linsysfs_allowed,
 4394     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4395     NULL, PR_ALLOW_MOUNT_LINSYSFS, sysctl_jail_default_allow, "I",
 4396     "Processes in jail can mount the linsysfs file system (deprecated)");
 4397 SYSCTL_PROC(_security_jail, OID_AUTO, mount_tmpfs_allowed,
 4398     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4399     NULL, PR_ALLOW_MOUNT_TMPFS, sysctl_jail_default_allow, "I",
 4400     "Processes in jail can mount the tmpfs file system (deprecated)");
 4401 SYSCTL_PROC(_security_jail, OID_AUTO, mount_zfs_allowed,
 4402     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4403     NULL, PR_ALLOW_MOUNT_ZFS, sysctl_jail_default_allow, "I",
 4404     "Processes in jail can mount the zfs file system (deprecated)");
 4405 
 4406 static int
 4407 sysctl_jail_default_level(SYSCTL_HANDLER_ARGS)
 4408 {
 4409         struct prison *pr;
 4410         int level, error;
 4411 
 4412         pr = req->td->td_ucred->cr_prison;
 4413         level = (pr == &prison0) ? *(int *)arg1 : *(int *)((char *)pr + arg2);
 4414         error = sysctl_handle_int(oidp, &level, 0, req);
 4415         if (error || !req->newptr)
 4416                 return (error);
 4417         *(int *)arg1 = level;
 4418         return (0);
 4419 }
 4420 
 4421 SYSCTL_PROC(_security_jail, OID_AUTO, enforce_statfs,
 4422     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 4423     &jail_default_enforce_statfs, offsetof(struct prison, pr_enforce_statfs),
 4424     sysctl_jail_default_level, "I",
 4425     "Processes in jail cannot see all mounted file systems (deprecated)");
 4426 
 4427 SYSCTL_PROC(_security_jail, OID_AUTO, devfs_ruleset,
 4428     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
 4429     &jail_default_devfs_rsnum, offsetof(struct prison, pr_devfs_rsnum),
 4430     sysctl_jail_default_level, "I",
 4431     "Ruleset for the devfs filesystem in jail (deprecated)");
 4432 
 4433 /*
 4434  * Nodes to describe jail parameters.  Maximum length of string parameters
 4435  * is returned in the string itself, and the other parameters exist merely
 4436  * to make themselves and their types known.
 4437  */
 4438 SYSCTL_NODE(_security_jail, OID_AUTO, param, CTLFLAG_RW, 0,
 4439     "Jail parameters");
 4440 
 4441 int
 4442 sysctl_jail_param(SYSCTL_HANDLER_ARGS)
 4443 {
 4444         int i;
 4445         long l;
 4446         size_t s;
 4447         char numbuf[12];
 4448 
 4449         switch (oidp->oid_kind & CTLTYPE)
 4450         {
 4451         case CTLTYPE_LONG:
 4452         case CTLTYPE_ULONG:
 4453                 l = 0;
 4454 #ifdef SCTL_MASK32
 4455                 if (!(req->flags & SCTL_MASK32))
 4456 #endif
 4457                         return (SYSCTL_OUT(req, &l, sizeof(l)));
 4458         case CTLTYPE_INT:
 4459         case CTLTYPE_UINT:
 4460                 i = 0;
 4461                 return (SYSCTL_OUT(req, &i, sizeof(i)));
 4462         case CTLTYPE_STRING:
 4463                 snprintf(numbuf, sizeof(numbuf), "%jd", (intmax_t)arg2);
 4464                 return
 4465                     (sysctl_handle_string(oidp, numbuf, sizeof(numbuf), req));
 4466         case CTLTYPE_STRUCT:
 4467                 s = (size_t)arg2;
 4468                 return (SYSCTL_OUT(req, &s, sizeof(s)));
 4469         }
 4470         return (0);
 4471 }
 4472 
 4473 /*
 4474  * CTLFLAG_RDTUN in the following indicates jail parameters that can be set at
 4475  * jail creation time but cannot be changed in an existing jail.
 4476  */
 4477 SYSCTL_JAIL_PARAM(, jid, CTLTYPE_INT | CTLFLAG_RDTUN, "I", "Jail ID");
 4478 SYSCTL_JAIL_PARAM(, parent, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail parent ID");
 4479 SYSCTL_JAIL_PARAM_STRING(, name, CTLFLAG_RW, MAXHOSTNAMELEN, "Jail name");
 4480 SYSCTL_JAIL_PARAM_STRING(, path, CTLFLAG_RDTUN, MAXPATHLEN, "Jail root path");
 4481 SYSCTL_JAIL_PARAM(, securelevel, CTLTYPE_INT | CTLFLAG_RW,
 4482     "I", "Jail secure level");
 4483 SYSCTL_JAIL_PARAM(, osreldate, CTLTYPE_INT | CTLFLAG_RDTUN, "I", 
 4484     "Jail value for kern.osreldate and uname -K");
 4485 SYSCTL_JAIL_PARAM_STRING(, osrelease, CTLFLAG_RDTUN, OSRELEASELEN, 
 4486     "Jail value for kern.osrelease and uname -r");
 4487 SYSCTL_JAIL_PARAM(, enforce_statfs, CTLTYPE_INT | CTLFLAG_RW,
 4488     "I", "Jail cannot see all mounted file systems");
 4489 SYSCTL_JAIL_PARAM(, devfs_ruleset, CTLTYPE_INT | CTLFLAG_RW,
 4490     "I", "Ruleset for in-jail devfs mounts");
 4491 SYSCTL_JAIL_PARAM(, persist, CTLTYPE_INT | CTLFLAG_RW,
 4492     "B", "Jail persistence");
 4493 #ifdef VIMAGE
 4494 SYSCTL_JAIL_PARAM(, vnet, CTLTYPE_INT | CTLFLAG_RDTUN,
 4495     "E,jailsys", "Virtual network stack");
 4496 #endif
 4497 SYSCTL_JAIL_PARAM(, dying, CTLTYPE_INT | CTLFLAG_RD,
 4498     "B", "Jail is in the process of shutting down");
 4499 
 4500 SYSCTL_JAIL_PARAM_NODE(children, "Number of child jails");
 4501 SYSCTL_JAIL_PARAM(_children, cur, CTLTYPE_INT | CTLFLAG_RD,
 4502     "I", "Current number of child jails");
 4503 SYSCTL_JAIL_PARAM(_children, max, CTLTYPE_INT | CTLFLAG_RW,
 4504     "I", "Maximum number of child jails");
 4505 
 4506 SYSCTL_JAIL_PARAM_SYS_NODE(host, CTLFLAG_RW, "Jail host info");
 4507 SYSCTL_JAIL_PARAM_STRING(_host, hostname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4508     "Jail hostname");
 4509 SYSCTL_JAIL_PARAM_STRING(_host, domainname, CTLFLAG_RW, MAXHOSTNAMELEN,
 4510     "Jail NIS domainname");
 4511 SYSCTL_JAIL_PARAM_STRING(_host, hostuuid, CTLFLAG_RW, HOSTUUIDLEN,
 4512     "Jail host UUID");
 4513 SYSCTL_JAIL_PARAM(_host, hostid, CTLTYPE_ULONG | CTLFLAG_RW,
 4514     "LU", "Jail host ID");
 4515 
 4516 SYSCTL_JAIL_PARAM_NODE(cpuset, "Jail cpuset");
 4517 SYSCTL_JAIL_PARAM(_cpuset, id, CTLTYPE_INT | CTLFLAG_RD, "I", "Jail cpuset ID");
 4518 
 4519 #ifdef INET
 4520 SYSCTL_JAIL_PARAM_SYS_NODE(ip4, CTLFLAG_RDTUN,
 4521     "Jail IPv4 address virtualization");
 4522 SYSCTL_JAIL_PARAM_STRUCT(_ip4, addr, CTLFLAG_RW, sizeof(struct in_addr),
 4523     "S,in_addr,a", "Jail IPv4 addresses");
 4524 SYSCTL_JAIL_PARAM(_ip4, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4525     "B", "Do (not) use IPv4 source address selection rather than the "
 4526     "primary jail IPv4 address.");
 4527 #endif
 4528 #ifdef INET6
 4529 SYSCTL_JAIL_PARAM_SYS_NODE(ip6, CTLFLAG_RDTUN,
 4530     "Jail IPv6 address virtualization");
 4531 SYSCTL_JAIL_PARAM_STRUCT(_ip6, addr, CTLFLAG_RW, sizeof(struct in6_addr),
 4532     "S,in6_addr,a", "Jail IPv6 addresses");
 4533 SYSCTL_JAIL_PARAM(_ip6, saddrsel, CTLTYPE_INT | CTLFLAG_RW,
 4534     "B", "Do (not) use IPv6 source address selection rather than the "
 4535     "primary jail IPv6 address.");
 4536 #endif
 4537 
 4538 SYSCTL_JAIL_PARAM_NODE(allow, "Jail permission flags");
 4539 SYSCTL_JAIL_PARAM(_allow, set_hostname, CTLTYPE_INT | CTLFLAG_RW,
 4540     "B", "Jail may set hostname");
 4541 SYSCTL_JAIL_PARAM(_allow, sysvipc, CTLTYPE_INT | CTLFLAG_RW,
 4542     "B", "Jail may use SYSV IPC");
 4543 SYSCTL_JAIL_PARAM(_allow, raw_sockets, CTLTYPE_INT | CTLFLAG_RW,
 4544     "B", "Jail may create raw sockets");
 4545 SYSCTL_JAIL_PARAM(_allow, chflags, CTLTYPE_INT | CTLFLAG_RW,
 4546     "B", "Jail may alter system file flags");
 4547 SYSCTL_JAIL_PARAM(_allow, quotas, CTLTYPE_INT | CTLFLAG_RW,
 4548     "B", "Jail may set file quotas");
 4549 SYSCTL_JAIL_PARAM(_allow, socket_af, CTLTYPE_INT | CTLFLAG_RW,
 4550     "B", "Jail may create sockets other than just UNIX/IPv4/IPv6/route");
 4551 
 4552 SYSCTL_JAIL_PARAM_SUBNODE(allow, mount, "Jail mount/unmount permission flags");
 4553 SYSCTL_JAIL_PARAM(_allow_mount, , CTLTYPE_INT | CTLFLAG_RW,
 4554     "B", "Jail may mount/unmount jail-friendly file systems in general");
 4555 SYSCTL_JAIL_PARAM(_allow_mount, devfs, CTLTYPE_INT | CTLFLAG_RW,
 4556     "B", "Jail may mount the devfs file system");
 4557 SYSCTL_JAIL_PARAM(_allow_mount, fdescfs, CTLTYPE_INT | CTLFLAG_RW,
 4558     "B", "Jail may mount the fdescfs file system");
 4559 SYSCTL_JAIL_PARAM(_allow_mount, nullfs, CTLTYPE_INT | CTLFLAG_RW,
 4560     "B", "Jail may mount the nullfs file system");
 4561 SYSCTL_JAIL_PARAM(_allow_mount, procfs, CTLTYPE_INT | CTLFLAG_RW,
 4562     "B", "Jail may mount the procfs file system");
 4563 SYSCTL_JAIL_PARAM(_allow_mount, linprocfs, CTLTYPE_INT | CTLFLAG_RW,
 4564     "B", "Jail may mount the linprocfs file system");
 4565 SYSCTL_JAIL_PARAM(_allow_mount, linsysfs, CTLTYPE_INT | CTLFLAG_RW,
 4566     "B", "Jail may mount the linsysfs file system");
 4567 SYSCTL_JAIL_PARAM(_allow_mount, tmpfs, CTLTYPE_INT | CTLFLAG_RW,
 4568     "B", "Jail may mount the tmpfs file system");
 4569 SYSCTL_JAIL_PARAM(_allow_mount, zfs, CTLTYPE_INT | CTLFLAG_RW,
 4570     "B", "Jail may mount the zfs file system");
 4571 
 4572 #ifdef RACCT
 4573 void
 4574 prison_racct_foreach(void (*callback)(struct racct *racct,
 4575     void *arg2, void *arg3), void *arg2, void *arg3)
 4576 {
 4577         struct prison_racct *prr;
 4578 
 4579         ASSERT_RACCT_ENABLED();
 4580 
 4581         sx_slock(&allprison_lock);
 4582         LIST_FOREACH(prr, &allprison_racct, prr_next)
 4583                 (callback)(prr->prr_racct, arg2, arg3);
 4584         sx_sunlock(&allprison_lock);
 4585 }
 4586 
 4587 static struct prison_racct *
 4588 prison_racct_find_locked(const char *name)
 4589 {
 4590         struct prison_racct *prr;
 4591 
 4592         ASSERT_RACCT_ENABLED();
 4593         sx_assert(&allprison_lock, SA_XLOCKED);
 4594 
 4595         if (name[0] == '\0' || strlen(name) >= MAXHOSTNAMELEN)
 4596                 return (NULL);
 4597 
 4598         LIST_FOREACH(prr, &allprison_racct, prr_next) {
 4599                 if (strcmp(name, prr->prr_name) != 0)
 4600                         continue;
 4601 
 4602                 /* Found prison_racct with a matching name? */
 4603                 prison_racct_hold(prr);
 4604                 return (prr);
 4605         }
 4606 
 4607         /* Add new prison_racct. */
 4608         prr = malloc(sizeof(*prr), M_PRISON_RACCT, M_ZERO | M_WAITOK);
 4609         racct_create(&prr->prr_racct);
 4610 
 4611         strcpy(prr->prr_name, name);
 4612         refcount_init(&prr->prr_refcount, 1);
 4613         LIST_INSERT_HEAD(&allprison_racct, prr, prr_next);
 4614 
 4615         return (prr);
 4616 }
 4617 
 4618 struct prison_racct *
 4619 prison_racct_find(const char *name)
 4620 {
 4621         struct prison_racct *prr;
 4622 
 4623         ASSERT_RACCT_ENABLED();
 4624 
 4625         sx_xlock(&allprison_lock);
 4626         prr = prison_racct_find_locked(name);
 4627         sx_xunlock(&allprison_lock);
 4628         return (prr);
 4629 }
 4630 
 4631 void
 4632 prison_racct_hold(struct prison_racct *prr)
 4633 {
 4634 
 4635         ASSERT_RACCT_ENABLED();
 4636 
 4637         refcount_acquire(&prr->prr_refcount);
 4638 }
 4639 
 4640 static void
 4641 prison_racct_free_locked(struct prison_racct *prr)
 4642 {
 4643 
 4644         ASSERT_RACCT_ENABLED();
 4645         sx_assert(&allprison_lock, SA_XLOCKED);
 4646 
 4647         if (refcount_release(&prr->prr_refcount)) {
 4648                 racct_destroy(&prr->prr_racct);
 4649                 LIST_REMOVE(prr, prr_next);
 4650                 free(prr, M_PRISON_RACCT);
 4651         }
 4652 }
 4653 
 4654 void
 4655 prison_racct_free(struct prison_racct *prr)
 4656 {
 4657         int old;
 4658 
 4659         ASSERT_RACCT_ENABLED();
 4660         sx_assert(&allprison_lock, SA_UNLOCKED);
 4661 
 4662         old = prr->prr_refcount;
 4663         if (old > 1 && atomic_cmpset_int(&prr->prr_refcount, old, old - 1))
 4664                 return;
 4665 
 4666         sx_xlock(&allprison_lock);
 4667         prison_racct_free_locked(prr);
 4668         sx_xunlock(&allprison_lock);
 4669 }
 4670 
 4671 static void
 4672 prison_racct_attach(struct prison *pr)
 4673 {
 4674         struct prison_racct *prr;
 4675 
 4676         ASSERT_RACCT_ENABLED();
 4677         sx_assert(&allprison_lock, SA_XLOCKED);
 4678 
 4679         prr = prison_racct_find_locked(pr->pr_name);
 4680         KASSERT(prr != NULL, ("cannot find prison_racct"));
 4681 
 4682         pr->pr_prison_racct = prr;
 4683 }
 4684 
 4685 /*
 4686  * Handle jail renaming.  From the racct point of view, renaming means
 4687  * moving from one prison_racct to another.
 4688  */
 4689 static void
 4690 prison_racct_modify(struct prison *pr)
 4691 {
 4692         struct proc *p;
 4693         struct ucred *cred;
 4694         struct prison_racct *oldprr;
 4695 
 4696         ASSERT_RACCT_ENABLED();
 4697 
 4698         sx_slock(&allproc_lock);
 4699         sx_xlock(&allprison_lock);
 4700 
 4701         if (strcmp(pr->pr_name, pr->pr_prison_racct->prr_name) == 0) {
 4702                 sx_xunlock(&allprison_lock);
 4703                 sx_sunlock(&allproc_lock);
 4704                 return;
 4705         }
 4706 
 4707         oldprr = pr->pr_prison_racct;
 4708         pr->pr_prison_racct = NULL;
 4709 
 4710         prison_racct_attach(pr);
 4711 
 4712         /*
 4713          * Move resource utilisation records.
 4714          */
 4715         racct_move(pr->pr_prison_racct->prr_racct, oldprr->prr_racct);
 4716 
 4717         /*
 4718          * Force rctl to reattach rules to processes.
 4719          */
 4720         FOREACH_PROC_IN_SYSTEM(p) {
 4721                 PROC_LOCK(p);
 4722                 cred = crhold(p->p_ucred);
 4723                 PROC_UNLOCK(p);
 4724                 racct_proc_ucred_changed(p, cred, cred);
 4725                 crfree(cred);
 4726         }
 4727 
 4728         sx_sunlock(&allproc_lock);
 4729         prison_racct_free_locked(oldprr);
 4730         sx_xunlock(&allprison_lock);
 4731 }
 4732 
 4733 static void
 4734 prison_racct_detach(struct prison *pr)
 4735 {
 4736 
 4737         ASSERT_RACCT_ENABLED();
 4738         sx_assert(&allprison_lock, SA_UNLOCKED);
 4739 
 4740         if (pr->pr_prison_racct == NULL)
 4741                 return;
 4742         prison_racct_free(pr->pr_prison_racct);
 4743         pr->pr_prison_racct = NULL;
 4744 }
 4745 #endif /* RACCT */
 4746 
 4747 #ifdef DDB
 4748 
 4749 static void
 4750 db_show_prison(struct prison *pr)
 4751 {
 4752         int fi;
 4753 #if defined(INET) || defined(INET6)
 4754         int ii;
 4755 #endif
 4756         unsigned jsf;
 4757 #ifdef INET6
 4758         char ip6buf[INET6_ADDRSTRLEN];
 4759 #endif
 4760 
 4761         db_printf("prison %p:\n", pr);
 4762         db_printf(" jid             = %d\n", pr->pr_id);
 4763         db_printf(" name            = %s\n", pr->pr_name);
 4764         db_printf(" parent          = %p\n", pr->pr_parent);
 4765         db_printf(" ref             = %d\n", pr->pr_ref);
 4766         db_printf(" uref            = %d\n", pr->pr_uref);
 4767         db_printf(" path            = %s\n", pr->pr_path);
 4768         db_printf(" cpuset          = %d\n", pr->pr_cpuset
 4769             ? pr->pr_cpuset->cs_id : -1);
 4770 #ifdef VIMAGE
 4771         db_printf(" vnet            = %p\n", pr->pr_vnet);
 4772 #endif
 4773         db_printf(" root            = %p\n", pr->pr_root);
 4774         db_printf(" securelevel     = %d\n", pr->pr_securelevel);
 4775         db_printf(" devfs_rsnum     = %d\n", pr->pr_devfs_rsnum);
 4776         db_printf(" children.max    = %d\n", pr->pr_childmax);
 4777         db_printf(" children.cur    = %d\n", pr->pr_childcount);
 4778         db_printf(" child           = %p\n", LIST_FIRST(&pr->pr_children));
 4779         db_printf(" sibling         = %p\n", LIST_NEXT(pr, pr_sibling));
 4780         db_printf(" flags           = 0x%x", pr->pr_flags);
 4781         for (fi = 0; fi < sizeof(pr_flag_names) / sizeof(pr_flag_names[0]);
 4782             fi++)
 4783                 if (pr_flag_names[fi] != NULL && (pr->pr_flags & (1 << fi)))
 4784                         db_printf(" %s", pr_flag_names[fi]);
 4785         for (fi = 0; fi < sizeof(pr_flag_jailsys) / sizeof(pr_flag_jailsys[0]);
 4786             fi++) {
 4787                 jsf = pr->pr_flags &
 4788                     (pr_flag_jailsys[fi].disable | pr_flag_jailsys[fi].new);
 4789                 db_printf(" %-16s= %s\n", pr_flag_jailsys[fi].name,
 4790                     pr_flag_jailsys[fi].disable && 
 4791                       (jsf == pr_flag_jailsys[fi].disable) ? "disable"
 4792                     : (jsf == pr_flag_jailsys[fi].new) ? "new"
 4793                     : "inherit");
 4794         }
 4795         db_printf(" allow           = 0x%x", pr->pr_allow);
 4796         for (fi = 0; fi < sizeof(pr_allow_names) / sizeof(pr_allow_names[0]);
 4797             fi++)
 4798                 if (pr_allow_names[fi] != NULL && (pr->pr_allow & (1 << fi)))
 4799                         db_printf(" %s", pr_allow_names[fi]);
 4800         db_printf("\n");
 4801         db_printf(" enforce_statfs  = %d\n", pr->pr_enforce_statfs);
 4802         db_printf(" host.hostname   = %s\n", pr->pr_hostname);
 4803         db_printf(" host.domainname = %s\n", pr->pr_domainname);
 4804         db_printf(" host.hostuuid   = %s\n", pr->pr_hostuuid);
 4805         db_printf(" host.hostid     = %lu\n", pr->pr_hostid);
 4806 #ifdef INET
 4807         db_printf(" ip4s            = %d\n", pr->pr_ip4s);
 4808         for (ii = 0; ii < pr->pr_ip4s; ii++)
 4809                 db_printf(" %s %s\n",
 4810                     ii == 0 ? "ip4.addr        =" : "                 ",
 4811                     inet_ntoa(pr->pr_ip4[ii]));
 4812 #endif
 4813 #ifdef INET6
 4814         db_printf(" ip6s            = %d\n", pr->pr_ip6s);
 4815         for (ii = 0; ii < pr->pr_ip6s; ii++)
 4816                 db_printf(" %s %s\n",
 4817                     ii == 0 ? "ip6.addr        =" : "                 ",
 4818                     ip6_sprintf(ip6buf, &pr->pr_ip6[ii]));
 4819 #endif
 4820 }
 4821 
 4822 DB_SHOW_COMMAND(prison, db_show_prison_command)
 4823 {
 4824         struct prison *pr;
 4825 
 4826         if (!have_addr) {
 4827                 /*
 4828                  * Show all prisons in the list, and prison0 which is not
 4829                  * listed.
 4830                  */
 4831                 db_show_prison(&prison0);
 4832                 if (!db_pager_quit) {
 4833                         TAILQ_FOREACH(pr, &allprison, pr_list) {
 4834                                 db_show_prison(pr);
 4835                                 if (db_pager_quit)
 4836                                         break;
 4837                         }
 4838                 }
 4839                 return;
 4840         }
 4841 
 4842         if (addr == 0)
 4843                 pr = &prison0;
 4844         else {
 4845                 /* Look for a prison with the ID and with references. */
 4846                 TAILQ_FOREACH(pr, &allprison, pr_list)
 4847                         if (pr->pr_id == addr && pr->pr_ref > 0)
 4848                                 break;
 4849                 if (pr == NULL)
 4850                         /* Look again, without requiring a reference. */
 4851                         TAILQ_FOREACH(pr, &allprison, pr_list)
 4852                                 if (pr->pr_id == addr)
 4853                                         break;
 4854                 if (pr == NULL)
 4855                         /* Assume address points to a valid prison. */
 4856                         pr = (struct prison *)addr;
 4857         }
 4858         db_show_prison(pr);
 4859 }
 4860 
 4861 #endif /* DDB */

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