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/sys/jail.h

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    1 /*-
    2  * ----------------------------------------------------------------------------
    3  * "THE BEER-WARE LICENSE" (Revision 42):
    4  * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
    5  * can do whatever you want with this stuff. If we meet some day, and you think
    6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
    7  * ----------------------------------------------------------------------------
    8  *
    9  * $FreeBSD$
   10  *
   11  */
   12 
   13 #ifndef _SYS_JAIL_H_
   14 #define _SYS_JAIL_H_
   15 
   16 struct jail {
   17         u_int32_t       version;
   18         char            *path;
   19         char            *hostname;
   20         u_int32_t       ip_number;
   21 };
   22 
   23 struct xprison {
   24         int              pr_version;
   25         int              pr_id;
   26         char             pr_path[MAXPATHLEN];
   27         char             pr_host[MAXHOSTNAMELEN];
   28         u_int32_t        pr_ip;
   29 };
   30 #define XPRISON_VERSION 1
   31 
   32 #ifndef _KERNEL
   33 
   34 int jail(struct jail *);
   35 int jail_attach(int);
   36 
   37 #else /* _KERNEL */
   38 
   39 #include <sys/queue.h>
   40 #include <sys/_lock.h>
   41 #include <sys/_mutex.h>
   42 #include <sys/_task.h>
   43 
   44 #define JAIL_MAX        999999
   45 
   46 #ifdef MALLOC_DECLARE
   47 MALLOC_DECLARE(M_PRISON);
   48 #endif
   49 
   50 /*
   51  * This structure describes a prison.  It is pointed to by all struct
   52  * ucreds's of the inmates.  pr_ref keeps track of them and is used to
   53  * delete the struture when the last inmate is dead.
   54  *
   55  * Lock key:
   56  *   (a) allprison_mutex
   57  *   (p) locked by pr_mutex
   58  *   (c) set only during creation before the structure is shared, no mutex
   59  *       required to read
   60  *   (d) set only during destruction of jail, no mutex needed
   61  */
   62 struct prison {
   63         LIST_ENTRY(prison) pr_list;                     /* (a) all prisons */
   64         int              pr_id;                         /* (c) prison id */
   65         int              pr_ref;                        /* (p) refcount */
   66         char             pr_path[MAXPATHLEN];           /* (c) chroot path */
   67         struct vnode    *pr_root;                       /* (c) vnode to rdir */
   68         char             pr_host[MAXHOSTNAMELEN];       /* (p) jail hostname */
   69         u_int32_t        pr_ip;                         /* (c) ip addr host */
   70         void            *pr_linux;                      /* (p) linux abi */
   71         int              pr_securelevel;                /* (p) securelevel */
   72         struct task      pr_task;                       /* (d) destroy task */
   73         struct mtx       pr_mtx;
   74 };
   75 
   76 /*
   77  * Sysctl-set variables that determine global jail policy
   78  *
   79  * XXX MIB entries will need to be protected by a mutex.
   80  */
   81 extern int      jail_set_hostname_allowed;
   82 extern int      jail_socket_unixiproute_only;
   83 extern int      jail_sysvipc_allowed;
   84 extern int      jail_getfsstat_jailrootonly;
   85 extern int      jail_allow_raw_sockets;
   86 extern int      jail_chflags_allowed;
   87 
   88 LIST_HEAD(prisonlist, prison);
   89 extern struct   prisonlist allprison;
   90 
   91 /*
   92  * Kernel support functions for jail().
   93  */
   94 struct ucred;
   95 struct mount;
   96 struct sockaddr;
   97 int jailed(struct ucred *cred);
   98 void getcredhostname(struct ucred *cred, char *, size_t);
   99 int prison_check(struct ucred *cred1, struct ucred *cred2);
  100 int prison_check_mount(struct ucred *cred, struct mount *mp);
  101 void prison_free(struct prison *pr);
  102 u_int32_t prison_getip(struct ucred *cred);
  103 void prison_hold(struct prison *pr);
  104 int prison_if(struct ucred *cred, struct sockaddr *sa);
  105 int prison_ip(struct ucred *cred, int flag, u_int32_t *ip);
  106 void prison_remote_ip(struct ucred *cred, int flags, u_int32_t *ip);
  107 
  108 #endif /* !_KERNEL */
  109 #endif /* !_SYS_JAIL_H_ */

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