dc68a63332
It may be used for external modules to attach some data to jail's in-kernel structure. - Change allprison_mtx mutex to allprison_sx sx(9) lock. We will need to call external functions while holding this lock, which may want to allocate memory. Make use of the fact that this is shared-exclusive lock and use shared version when possible. - Implement the following functions: prison_service_register() - registers a service that wants to be noticed when a jail is created and destroyed prison_service_deregister() - deregisters service prison_service_data_add() - adds service-specific data to the jail structure prison_service_data_get() - takes service-specific data from the jail structure prison_service_data_del() - removes service-specific data from the jail structure Reviewed by: rwatson
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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*/
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#ifndef _SYS_JAIL_H_
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#define _SYS_JAIL_H_
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struct jail {
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u_int32_t version;
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char *path;
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char *hostname;
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u_int32_t ip_number;
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};
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struct xprison {
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int pr_version;
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int pr_id;
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char pr_path[MAXPATHLEN];
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char pr_host[MAXHOSTNAMELEN];
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u_int32_t pr_ip;
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};
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#define XPRISON_VERSION 1
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#ifndef _KERNEL
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int jail(struct jail *);
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int jail_attach(int);
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#else /* _KERNEL */
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/_task.h>
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#define JAIL_MAX 999999
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_PRISON);
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#endif
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#endif /* _KERNEL */
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/*
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* This structure describes a prison. It is pointed to by all struct
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* ucreds's of the inmates. pr_ref keeps track of them and is used to
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* delete the struture when the last inmate is dead.
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*
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* Lock key:
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* (a) allprison_lock
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* (p) locked by pr_mtx
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* (c) set only during creation before the structure is shared, no mutex
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* required to read
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* (d) set only during destruction of jail, no mutex needed
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*/
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#if defined(_KERNEL) || defined(_WANT_PRISON)
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struct prison {
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LIST_ENTRY(prison) pr_list; /* (a) all prisons */
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int pr_id; /* (c) prison id */
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int pr_ref; /* (p) refcount */
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char pr_path[MAXPATHLEN]; /* (c) chroot path */
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struct vnode *pr_root; /* (c) vnode to rdir */
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char pr_host[MAXHOSTNAMELEN]; /* (p) jail hostname */
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u_int32_t pr_ip; /* (c) ip addr host */
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void *pr_linux; /* (p) linux abi */
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int pr_securelevel; /* (p) securelevel */
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struct task pr_task; /* (d) destroy task */
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struct mtx pr_mtx;
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void **pr_slots; /* (p) additional data */
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};
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#endif /* _KERNEL || _WANT_PRISON */
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#ifdef _KERNEL
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/*
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* Sysctl-set variables that determine global jail policy
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*
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* XXX MIB entries will need to be protected by a mutex.
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*/
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extern int jail_set_hostname_allowed;
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extern int jail_socket_unixiproute_only;
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extern int jail_sysvipc_allowed;
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extern int jail_getfsstat_jailrootonly;
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extern int jail_allow_raw_sockets;
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extern int jail_chflags_allowed;
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LIST_HEAD(prisonlist, prison);
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extern struct prisonlist allprison;
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extern struct sx allprison_lock;
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/*
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* Kernel support functions for jail().
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*/
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struct ucred;
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struct mount;
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struct sockaddr;
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struct statfs;
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int jailed(struct ucred *cred);
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void getcredhostname(struct ucred *cred, char *, size_t);
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int prison_check(struct ucred *cred1, struct ucred *cred2);
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int prison_canseemount(struct ucred *cred, struct mount *mp);
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void prison_enforce_statfs(struct ucred *cred, struct mount *mp,
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struct statfs *sp);
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struct prison *prison_find(int prid);
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void prison_free(struct prison *pr);
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u_int32_t prison_getip(struct ucred *cred);
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void prison_hold(struct prison *pr);
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int prison_if(struct ucred *cred, struct sockaddr *sa);
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int prison_ip(struct ucred *cred, int flag, u_int32_t *ip);
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int prison_priv_check(struct ucred *cred, int priv);
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void prison_remote_ip(struct ucred *cred, int flags, u_int32_t *ip);
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/*
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* Kernel jail services.
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*/
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struct prison_service;
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typedef int (*prison_create_t)(struct prison_service *psrv, struct prison *pr);
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typedef int (*prison_destroy_t)(struct prison_service *psrv, struct prison *pr);
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struct prison_service *prison_service_register(const char *name,
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prison_create_t create, prison_destroy_t destroy);
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void prison_service_deregister(struct prison_service *psrv);
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void prison_service_data_set(struct prison_service *psrv, struct prison *pr,
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void *data);
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void *prison_service_data_get(struct prison_service *psrv, struct prison *pr);
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void *prison_service_data_del(struct prison_service *psrv, struct prison *pr);
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#endif /* _KERNEL */
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#endif /* !_SYS_JAIL_H_ */
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