15bcf785ba
This requires minor changes to the audit framework to allow capturing paths that are not filesystem paths (i.e., will not be canonicalised relative to the process current working directory and/or filesystem root). Obtained from: TrustedBSD Project MFC after: 3 weeks Sponsored by: DARPA, AFRL
2940 lines
64 KiB
C
2940 lines
64 KiB
C
/*-
|
|
* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
|
|
* Copyright (c) 2016-2017 Robert N. M. Watson
|
|
* All rights reserved.
|
|
*
|
|
* Portions of this software were developed by BAE Systems, the University of
|
|
* Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
|
|
* contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
|
|
* Computing (TC) research program.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* POSIX message queue implementation.
|
|
*
|
|
* 1) A mqueue filesystem can be mounted, each message queue appears
|
|
* in mounted directory, user can change queue's permission and
|
|
* ownership, or remove a queue. Manually creating a file in the
|
|
* directory causes a message queue to be created in the kernel with
|
|
* default message queue attributes applied and same name used, this
|
|
* method is not advocated since mq_open syscall allows user to specify
|
|
* different attributes. Also the file system can be mounted multiple
|
|
* times at different mount points but shows same contents.
|
|
*
|
|
* 2) Standard POSIX message queue API. The syscalls do not use vfs layer,
|
|
* but directly operate on internal data structure, this allows user to
|
|
* use the IPC facility without having to mount mqueue file system.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_capsicum.h"
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/capsicum.h>
|
|
#include <sys/dirent.h>
|
|
#include <sys/event.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/mqueue.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/posix4.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/syscallsubr.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/taskqueue.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/user.h>
|
|
#include <sys/vnode.h>
|
|
#include <machine/atomic.h>
|
|
|
|
#include <security/audit/audit.h>
|
|
|
|
FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
|
|
|
|
/*
|
|
* Limits and constants
|
|
*/
|
|
#define MQFS_NAMELEN NAME_MAX
|
|
#define MQFS_DELEN (8 + MQFS_NAMELEN)
|
|
|
|
/* node types */
|
|
typedef enum {
|
|
mqfstype_none = 0,
|
|
mqfstype_root,
|
|
mqfstype_dir,
|
|
mqfstype_this,
|
|
mqfstype_parent,
|
|
mqfstype_file,
|
|
mqfstype_symlink,
|
|
} mqfs_type_t;
|
|
|
|
struct mqfs_node;
|
|
|
|
/*
|
|
* mqfs_info: describes a mqfs instance
|
|
*/
|
|
struct mqfs_info {
|
|
struct sx mi_lock;
|
|
struct mqfs_node *mi_root;
|
|
struct unrhdr *mi_unrhdr;
|
|
};
|
|
|
|
struct mqfs_vdata {
|
|
LIST_ENTRY(mqfs_vdata) mv_link;
|
|
struct mqfs_node *mv_node;
|
|
struct vnode *mv_vnode;
|
|
struct task mv_task;
|
|
};
|
|
|
|
/*
|
|
* mqfs_node: describes a node (file or directory) within a mqfs
|
|
*/
|
|
struct mqfs_node {
|
|
char mn_name[MQFS_NAMELEN+1];
|
|
struct mqfs_info *mn_info;
|
|
struct mqfs_node *mn_parent;
|
|
LIST_HEAD(,mqfs_node) mn_children;
|
|
LIST_ENTRY(mqfs_node) mn_sibling;
|
|
LIST_HEAD(,mqfs_vdata) mn_vnodes;
|
|
const void *mn_pr_root;
|
|
int mn_refcount;
|
|
mqfs_type_t mn_type;
|
|
int mn_deleted;
|
|
uint32_t mn_fileno;
|
|
void *mn_data;
|
|
struct timespec mn_birth;
|
|
struct timespec mn_ctime;
|
|
struct timespec mn_atime;
|
|
struct timespec mn_mtime;
|
|
uid_t mn_uid;
|
|
gid_t mn_gid;
|
|
int mn_mode;
|
|
};
|
|
|
|
#define VTON(vp) (((struct mqfs_vdata *)((vp)->v_data))->mv_node)
|
|
#define VTOMQ(vp) ((struct mqueue *)(VTON(vp)->mn_data))
|
|
#define VFSTOMQFS(m) ((struct mqfs_info *)((m)->mnt_data))
|
|
#define FPTOMQ(fp) ((struct mqueue *)(((struct mqfs_node *) \
|
|
(fp)->f_data)->mn_data))
|
|
|
|
TAILQ_HEAD(msgq, mqueue_msg);
|
|
|
|
struct mqueue;
|
|
|
|
struct mqueue_notifier {
|
|
LIST_ENTRY(mqueue_notifier) nt_link;
|
|
struct sigevent nt_sigev;
|
|
ksiginfo_t nt_ksi;
|
|
struct proc *nt_proc;
|
|
};
|
|
|
|
struct mqueue {
|
|
struct mtx mq_mutex;
|
|
int mq_flags;
|
|
long mq_maxmsg;
|
|
long mq_msgsize;
|
|
long mq_curmsgs;
|
|
long mq_totalbytes;
|
|
struct msgq mq_msgq;
|
|
int mq_receivers;
|
|
int mq_senders;
|
|
struct selinfo mq_rsel;
|
|
struct selinfo mq_wsel;
|
|
struct mqueue_notifier *mq_notifier;
|
|
};
|
|
|
|
#define MQ_RSEL 0x01
|
|
#define MQ_WSEL 0x02
|
|
|
|
struct mqueue_msg {
|
|
TAILQ_ENTRY(mqueue_msg) msg_link;
|
|
unsigned int msg_prio;
|
|
unsigned int msg_size;
|
|
/* following real data... */
|
|
};
|
|
|
|
static SYSCTL_NODE(_kern, OID_AUTO, mqueue, CTLFLAG_RW, 0,
|
|
"POSIX real time message queue");
|
|
|
|
static int default_maxmsg = 10;
|
|
static int default_msgsize = 1024;
|
|
|
|
static int maxmsg = 100;
|
|
SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsg, CTLFLAG_RW,
|
|
&maxmsg, 0, "Default maximum messages in queue");
|
|
static int maxmsgsize = 16384;
|
|
SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmsgsize, CTLFLAG_RW,
|
|
&maxmsgsize, 0, "Default maximum message size");
|
|
static int maxmq = 100;
|
|
SYSCTL_INT(_kern_mqueue, OID_AUTO, maxmq, CTLFLAG_RW,
|
|
&maxmq, 0, "maximum message queues");
|
|
static int curmq = 0;
|
|
SYSCTL_INT(_kern_mqueue, OID_AUTO, curmq, CTLFLAG_RW,
|
|
&curmq, 0, "current message queue number");
|
|
static int unloadable = 0;
|
|
static MALLOC_DEFINE(M_MQUEUEDATA, "mqdata", "mqueue data");
|
|
|
|
static eventhandler_tag exit_tag;
|
|
|
|
/* Only one instance per-system */
|
|
static struct mqfs_info mqfs_data;
|
|
static uma_zone_t mqnode_zone;
|
|
static uma_zone_t mqueue_zone;
|
|
static uma_zone_t mvdata_zone;
|
|
static uma_zone_t mqnoti_zone;
|
|
static struct vop_vector mqfs_vnodeops;
|
|
static struct fileops mqueueops;
|
|
static unsigned mqfs_osd_jail_slot;
|
|
|
|
/*
|
|
* Directory structure construction and manipulation
|
|
*/
|
|
#ifdef notyet
|
|
static struct mqfs_node *mqfs_create_dir(struct mqfs_node *parent,
|
|
const char *name, int namelen, struct ucred *cred, int mode);
|
|
static struct mqfs_node *mqfs_create_link(struct mqfs_node *parent,
|
|
const char *name, int namelen, struct ucred *cred, int mode);
|
|
#endif
|
|
|
|
static struct mqfs_node *mqfs_create_file(struct mqfs_node *parent,
|
|
const char *name, int namelen, struct ucred *cred, int mode);
|
|
static int mqfs_destroy(struct mqfs_node *mn);
|
|
static void mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn);
|
|
static void mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn);
|
|
static int mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn);
|
|
static int mqfs_prison_remove(void *obj, void *data);
|
|
|
|
/*
|
|
* Message queue construction and maniplation
|
|
*/
|
|
static struct mqueue *mqueue_alloc(const struct mq_attr *attr);
|
|
static void mqueue_free(struct mqueue *mq);
|
|
static int mqueue_send(struct mqueue *mq, const char *msg_ptr,
|
|
size_t msg_len, unsigned msg_prio, int waitok,
|
|
const struct timespec *abs_timeout);
|
|
static int mqueue_receive(struct mqueue *mq, char *msg_ptr,
|
|
size_t msg_len, unsigned *msg_prio, int waitok,
|
|
const struct timespec *abs_timeout);
|
|
static int _mqueue_send(struct mqueue *mq, struct mqueue_msg *msg,
|
|
int timo);
|
|
static int _mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg,
|
|
int timo);
|
|
static void mqueue_send_notification(struct mqueue *mq);
|
|
static void mqueue_fdclose(struct thread *td, int fd, struct file *fp);
|
|
static void mq_proc_exit(void *arg, struct proc *p);
|
|
|
|
/*
|
|
* kqueue filters
|
|
*/
|
|
static void filt_mqdetach(struct knote *kn);
|
|
static int filt_mqread(struct knote *kn, long hint);
|
|
static int filt_mqwrite(struct knote *kn, long hint);
|
|
|
|
struct filterops mq_rfiltops = {
|
|
.f_isfd = 1,
|
|
.f_detach = filt_mqdetach,
|
|
.f_event = filt_mqread,
|
|
};
|
|
struct filterops mq_wfiltops = {
|
|
.f_isfd = 1,
|
|
.f_detach = filt_mqdetach,
|
|
.f_event = filt_mqwrite,
|
|
};
|
|
|
|
/*
|
|
* Initialize fileno bitmap
|
|
*/
|
|
static void
|
|
mqfs_fileno_init(struct mqfs_info *mi)
|
|
{
|
|
struct unrhdr *up;
|
|
|
|
up = new_unrhdr(1, INT_MAX, NULL);
|
|
mi->mi_unrhdr = up;
|
|
}
|
|
|
|
/*
|
|
* Tear down fileno bitmap
|
|
*/
|
|
static void
|
|
mqfs_fileno_uninit(struct mqfs_info *mi)
|
|
{
|
|
struct unrhdr *up;
|
|
|
|
up = mi->mi_unrhdr;
|
|
mi->mi_unrhdr = NULL;
|
|
delete_unrhdr(up);
|
|
}
|
|
|
|
/*
|
|
* Allocate a file number
|
|
*/
|
|
static void
|
|
mqfs_fileno_alloc(struct mqfs_info *mi, struct mqfs_node *mn)
|
|
{
|
|
/* make sure our parent has a file number */
|
|
if (mn->mn_parent && !mn->mn_parent->mn_fileno)
|
|
mqfs_fileno_alloc(mi, mn->mn_parent);
|
|
|
|
switch (mn->mn_type) {
|
|
case mqfstype_root:
|
|
case mqfstype_dir:
|
|
case mqfstype_file:
|
|
case mqfstype_symlink:
|
|
mn->mn_fileno = alloc_unr(mi->mi_unrhdr);
|
|
break;
|
|
case mqfstype_this:
|
|
KASSERT(mn->mn_parent != NULL,
|
|
("mqfstype_this node has no parent"));
|
|
mn->mn_fileno = mn->mn_parent->mn_fileno;
|
|
break;
|
|
case mqfstype_parent:
|
|
KASSERT(mn->mn_parent != NULL,
|
|
("mqfstype_parent node has no parent"));
|
|
if (mn->mn_parent == mi->mi_root) {
|
|
mn->mn_fileno = mn->mn_parent->mn_fileno;
|
|
break;
|
|
}
|
|
KASSERT(mn->mn_parent->mn_parent != NULL,
|
|
("mqfstype_parent node has no grandparent"));
|
|
mn->mn_fileno = mn->mn_parent->mn_parent->mn_fileno;
|
|
break;
|
|
default:
|
|
KASSERT(0,
|
|
("mqfs_fileno_alloc() called for unknown type node: %d",
|
|
mn->mn_type));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release a file number
|
|
*/
|
|
static void
|
|
mqfs_fileno_free(struct mqfs_info *mi, struct mqfs_node *mn)
|
|
{
|
|
switch (mn->mn_type) {
|
|
case mqfstype_root:
|
|
case mqfstype_dir:
|
|
case mqfstype_file:
|
|
case mqfstype_symlink:
|
|
free_unr(mi->mi_unrhdr, mn->mn_fileno);
|
|
break;
|
|
case mqfstype_this:
|
|
case mqfstype_parent:
|
|
/* ignore these, as they don't "own" their file number */
|
|
break;
|
|
default:
|
|
KASSERT(0,
|
|
("mqfs_fileno_free() called for unknown type node: %d",
|
|
mn->mn_type));
|
|
break;
|
|
}
|
|
}
|
|
|
|
static __inline struct mqfs_node *
|
|
mqnode_alloc(void)
|
|
{
|
|
return uma_zalloc(mqnode_zone, M_WAITOK | M_ZERO);
|
|
}
|
|
|
|
static __inline void
|
|
mqnode_free(struct mqfs_node *node)
|
|
{
|
|
uma_zfree(mqnode_zone, node);
|
|
}
|
|
|
|
static __inline void
|
|
mqnode_addref(struct mqfs_node *node)
|
|
{
|
|
atomic_fetchadd_int(&node->mn_refcount, 1);
|
|
}
|
|
|
|
static __inline void
|
|
mqnode_release(struct mqfs_node *node)
|
|
{
|
|
struct mqfs_info *mqfs;
|
|
int old, exp;
|
|
|
|
mqfs = node->mn_info;
|
|
old = atomic_fetchadd_int(&node->mn_refcount, -1);
|
|
if (node->mn_type == mqfstype_dir ||
|
|
node->mn_type == mqfstype_root)
|
|
exp = 3; /* include . and .. */
|
|
else
|
|
exp = 1;
|
|
if (old == exp) {
|
|
int locked = sx_xlocked(&mqfs->mi_lock);
|
|
if (!locked)
|
|
sx_xlock(&mqfs->mi_lock);
|
|
mqfs_destroy(node);
|
|
if (!locked)
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a node to a directory
|
|
*/
|
|
static int
|
|
mqfs_add_node(struct mqfs_node *parent, struct mqfs_node *node)
|
|
{
|
|
KASSERT(parent != NULL, ("%s(): parent is NULL", __func__));
|
|
KASSERT(parent->mn_info != NULL,
|
|
("%s(): parent has no mn_info", __func__));
|
|
KASSERT(parent->mn_type == mqfstype_dir ||
|
|
parent->mn_type == mqfstype_root,
|
|
("%s(): parent is not a directory", __func__));
|
|
|
|
node->mn_info = parent->mn_info;
|
|
node->mn_parent = parent;
|
|
LIST_INIT(&node->mn_children);
|
|
LIST_INIT(&node->mn_vnodes);
|
|
LIST_INSERT_HEAD(&parent->mn_children, node, mn_sibling);
|
|
mqnode_addref(parent);
|
|
return (0);
|
|
}
|
|
|
|
static struct mqfs_node *
|
|
mqfs_create_node(const char *name, int namelen, struct ucred *cred, int mode,
|
|
int nodetype)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqnode_alloc();
|
|
strncpy(node->mn_name, name, namelen);
|
|
node->mn_pr_root = cred->cr_prison->pr_root;
|
|
node->mn_type = nodetype;
|
|
node->mn_refcount = 1;
|
|
vfs_timestamp(&node->mn_birth);
|
|
node->mn_ctime = node->mn_atime = node->mn_mtime
|
|
= node->mn_birth;
|
|
node->mn_uid = cred->cr_uid;
|
|
node->mn_gid = cred->cr_gid;
|
|
node->mn_mode = mode;
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Create a file
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_create_file(struct mqfs_node *parent, const char *name, int namelen,
|
|
struct ucred *cred, int mode)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqfs_create_node(name, namelen, cred, mode, mqfstype_file);
|
|
if (mqfs_add_node(parent, node) != 0) {
|
|
mqnode_free(node);
|
|
return (NULL);
|
|
}
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Add . and .. to a directory
|
|
*/
|
|
static int
|
|
mqfs_fixup_dir(struct mqfs_node *parent)
|
|
{
|
|
struct mqfs_node *dir;
|
|
|
|
dir = mqnode_alloc();
|
|
dir->mn_name[0] = '.';
|
|
dir->mn_type = mqfstype_this;
|
|
dir->mn_refcount = 1;
|
|
if (mqfs_add_node(parent, dir) != 0) {
|
|
mqnode_free(dir);
|
|
return (-1);
|
|
}
|
|
|
|
dir = mqnode_alloc();
|
|
dir->mn_name[0] = dir->mn_name[1] = '.';
|
|
dir->mn_type = mqfstype_parent;
|
|
dir->mn_refcount = 1;
|
|
|
|
if (mqfs_add_node(parent, dir) != 0) {
|
|
mqnode_free(dir);
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef notyet
|
|
|
|
/*
|
|
* Create a directory
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_create_dir(struct mqfs_node *parent, const char *name, int namelen,
|
|
struct ucred *cred, int mode)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqfs_create_node(name, namelen, cred, mode, mqfstype_dir);
|
|
if (mqfs_add_node(parent, node) != 0) {
|
|
mqnode_free(node);
|
|
return (NULL);
|
|
}
|
|
|
|
if (mqfs_fixup_dir(node) != 0) {
|
|
mqfs_destroy(node);
|
|
return (NULL);
|
|
}
|
|
return (node);
|
|
}
|
|
|
|
/*
|
|
* Create a symlink
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_create_link(struct mqfs_node *parent, const char *name, int namelen,
|
|
struct ucred *cred, int mode)
|
|
{
|
|
struct mqfs_node *node;
|
|
|
|
node = mqfs_create_node(name, namelen, cred, mode, mqfstype_symlink);
|
|
if (mqfs_add_node(parent, node) != 0) {
|
|
mqnode_free(node);
|
|
return (NULL);
|
|
}
|
|
return (node);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Destroy a node or a tree of nodes
|
|
*/
|
|
static int
|
|
mqfs_destroy(struct mqfs_node *node)
|
|
{
|
|
struct mqfs_node *parent;
|
|
|
|
KASSERT(node != NULL,
|
|
("%s(): node is NULL", __func__));
|
|
KASSERT(node->mn_info != NULL,
|
|
("%s(): node has no mn_info", __func__));
|
|
|
|
/* destroy children */
|
|
if (node->mn_type == mqfstype_dir || node->mn_type == mqfstype_root)
|
|
while (! LIST_EMPTY(&node->mn_children))
|
|
mqfs_destroy(LIST_FIRST(&node->mn_children));
|
|
|
|
/* unlink from parent */
|
|
if ((parent = node->mn_parent) != NULL) {
|
|
KASSERT(parent->mn_info == node->mn_info,
|
|
("%s(): parent has different mn_info", __func__));
|
|
LIST_REMOVE(node, mn_sibling);
|
|
}
|
|
|
|
if (node->mn_fileno != 0)
|
|
mqfs_fileno_free(node->mn_info, node);
|
|
if (node->mn_data != NULL)
|
|
mqueue_free(node->mn_data);
|
|
mqnode_free(node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Mount a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_mount(struct mount *mp)
|
|
{
|
|
struct statfs *sbp;
|
|
|
|
if (mp->mnt_flag & MNT_UPDATE)
|
|
return (EOPNOTSUPP);
|
|
|
|
mp->mnt_data = &mqfs_data;
|
|
MNT_ILOCK(mp);
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
MNT_IUNLOCK(mp);
|
|
vfs_getnewfsid(mp);
|
|
|
|
sbp = &mp->mnt_stat;
|
|
vfs_mountedfrom(mp, "mqueue");
|
|
sbp->f_bsize = PAGE_SIZE;
|
|
sbp->f_iosize = PAGE_SIZE;
|
|
sbp->f_blocks = 1;
|
|
sbp->f_bfree = 0;
|
|
sbp->f_bavail = 0;
|
|
sbp->f_files = 1;
|
|
sbp->f_ffree = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unmount a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_unmount(struct mount *mp, int mntflags)
|
|
{
|
|
int error;
|
|
|
|
error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0,
|
|
curthread);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return a root vnode
|
|
*/
|
|
static int
|
|
mqfs_root(struct mount *mp, int flags, struct vnode **vpp)
|
|
{
|
|
struct mqfs_info *mqfs;
|
|
int ret;
|
|
|
|
mqfs = VFSTOMQFS(mp);
|
|
ret = mqfs_allocv(mp, vpp, mqfs->mi_root);
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Return filesystem stats
|
|
*/
|
|
static int
|
|
mqfs_statfs(struct mount *mp, struct statfs *sbp)
|
|
{
|
|
/* XXX update statistics */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_init(struct vfsconf *vfc)
|
|
{
|
|
struct mqfs_node *root;
|
|
struct mqfs_info *mi;
|
|
osd_method_t methods[PR_MAXMETHOD] = {
|
|
[PR_METHOD_REMOVE] = mqfs_prison_remove,
|
|
};
|
|
|
|
mqnode_zone = uma_zcreate("mqnode", sizeof(struct mqfs_node),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mqueue_zone = uma_zcreate("mqueue", sizeof(struct mqueue),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mvdata_zone = uma_zcreate("mvdata",
|
|
sizeof(struct mqfs_vdata), NULL, NULL, NULL,
|
|
NULL, UMA_ALIGN_PTR, 0);
|
|
mqnoti_zone = uma_zcreate("mqnotifier", sizeof(struct mqueue_notifier),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mi = &mqfs_data;
|
|
sx_init(&mi->mi_lock, "mqfs lock");
|
|
/* set up the root diretory */
|
|
root = mqfs_create_node("/", 1, curthread->td_ucred, 01777,
|
|
mqfstype_root);
|
|
root->mn_info = mi;
|
|
LIST_INIT(&root->mn_children);
|
|
LIST_INIT(&root->mn_vnodes);
|
|
mi->mi_root = root;
|
|
mqfs_fileno_init(mi);
|
|
mqfs_fileno_alloc(mi, root);
|
|
mqfs_fixup_dir(root);
|
|
exit_tag = EVENTHANDLER_REGISTER(process_exit, mq_proc_exit, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
mq_fdclose = mqueue_fdclose;
|
|
p31b_setcfg(CTL_P1003_1B_MESSAGE_PASSING, _POSIX_MESSAGE_PASSING);
|
|
mqfs_osd_jail_slot = osd_jail_register(NULL, methods);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Destroy a mqfs instance
|
|
*/
|
|
static int
|
|
mqfs_uninit(struct vfsconf *vfc)
|
|
{
|
|
struct mqfs_info *mi;
|
|
|
|
if (!unloadable)
|
|
return (EOPNOTSUPP);
|
|
osd_jail_deregister(mqfs_osd_jail_slot);
|
|
EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
|
|
mi = &mqfs_data;
|
|
mqfs_destroy(mi->mi_root);
|
|
mi->mi_root = NULL;
|
|
mqfs_fileno_uninit(mi);
|
|
sx_destroy(&mi->mi_lock);
|
|
uma_zdestroy(mqnode_zone);
|
|
uma_zdestroy(mqueue_zone);
|
|
uma_zdestroy(mvdata_zone);
|
|
uma_zdestroy(mqnoti_zone);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* task routine
|
|
*/
|
|
static void
|
|
do_recycle(void *context, int pending __unused)
|
|
{
|
|
struct vnode *vp = (struct vnode *)context;
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
vrecycle(vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
vdrop(vp);
|
|
}
|
|
|
|
/*
|
|
* Allocate a vnode
|
|
*/
|
|
static int
|
|
mqfs_allocv(struct mount *mp, struct vnode **vpp, struct mqfs_node *pn)
|
|
{
|
|
struct mqfs_vdata *vd;
|
|
struct mqfs_info *mqfs;
|
|
struct vnode *newvpp;
|
|
int error;
|
|
|
|
mqfs = pn->mn_info;
|
|
*vpp = NULL;
|
|
sx_xlock(&mqfs->mi_lock);
|
|
LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
|
|
if (vd->mv_vnode->v_mount == mp) {
|
|
vhold(vd->mv_vnode);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (vd != NULL) {
|
|
found:
|
|
*vpp = vd->mv_vnode;
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
error = vget(*vpp, LK_RETRY | LK_EXCLUSIVE, curthread);
|
|
vdrop(*vpp);
|
|
return (error);
|
|
}
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
|
|
error = getnewvnode("mqueue", mp, &mqfs_vnodeops, &newvpp);
|
|
if (error)
|
|
return (error);
|
|
vn_lock(newvpp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = insmntque(newvpp, mp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
sx_xlock(&mqfs->mi_lock);
|
|
/*
|
|
* Check if it has already been allocated
|
|
* while we were blocked.
|
|
*/
|
|
LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
|
|
if (vd->mv_vnode->v_mount == mp) {
|
|
vhold(vd->mv_vnode);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
|
|
vgone(newvpp);
|
|
vput(newvpp);
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
*vpp = newvpp;
|
|
|
|
vd = uma_zalloc(mvdata_zone, M_WAITOK);
|
|
(*vpp)->v_data = vd;
|
|
vd->mv_vnode = *vpp;
|
|
vd->mv_node = pn;
|
|
TASK_INIT(&vd->mv_task, 0, do_recycle, *vpp);
|
|
LIST_INSERT_HEAD(&pn->mn_vnodes, vd, mv_link);
|
|
mqnode_addref(pn);
|
|
switch (pn->mn_type) {
|
|
case mqfstype_root:
|
|
(*vpp)->v_vflag = VV_ROOT;
|
|
/* fall through */
|
|
case mqfstype_dir:
|
|
case mqfstype_this:
|
|
case mqfstype_parent:
|
|
(*vpp)->v_type = VDIR;
|
|
break;
|
|
case mqfstype_file:
|
|
(*vpp)->v_type = VREG;
|
|
break;
|
|
case mqfstype_symlink:
|
|
(*vpp)->v_type = VLNK;
|
|
break;
|
|
case mqfstype_none:
|
|
KASSERT(0, ("mqfs_allocf called for null node\n"));
|
|
default:
|
|
panic("%s has unexpected type: %d", pn->mn_name, pn->mn_type);
|
|
}
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Search a directory entry
|
|
*/
|
|
static struct mqfs_node *
|
|
mqfs_search(struct mqfs_node *pd, const char *name, int len, struct ucred *cred)
|
|
{
|
|
struct mqfs_node *pn;
|
|
const void *pr_root;
|
|
|
|
sx_assert(&pd->mn_info->mi_lock, SX_LOCKED);
|
|
pr_root = cred->cr_prison->pr_root;
|
|
LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
|
|
/* Only match names within the same prison root directory */
|
|
if ((pn->mn_pr_root == NULL || pn->mn_pr_root == pr_root) &&
|
|
strncmp(pn->mn_name, name, len) == 0 &&
|
|
pn->mn_name[len] == '\0')
|
|
return (pn);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Look up a file or directory.
|
|
*/
|
|
static int
|
|
mqfs_lookupx(struct vop_cachedlookup_args *ap)
|
|
{
|
|
struct componentname *cnp;
|
|
struct vnode *dvp, **vpp;
|
|
struct mqfs_node *pd;
|
|
struct mqfs_node *pn;
|
|
struct mqfs_info *mqfs;
|
|
int nameiop, flags, error, namelen;
|
|
char *pname;
|
|
struct thread *td;
|
|
|
|
cnp = ap->a_cnp;
|
|
vpp = ap->a_vpp;
|
|
dvp = ap->a_dvp;
|
|
pname = cnp->cn_nameptr;
|
|
namelen = cnp->cn_namelen;
|
|
td = cnp->cn_thread;
|
|
flags = cnp->cn_flags;
|
|
nameiop = cnp->cn_nameiop;
|
|
pd = VTON(dvp);
|
|
pn = NULL;
|
|
mqfs = pd->mn_info;
|
|
*vpp = NULLVP;
|
|
|
|
if (dvp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* shortcut: check if the name is too long */
|
|
if (cnp->cn_namelen >= MQFS_NAMELEN)
|
|
return (ENOENT);
|
|
|
|
/* self */
|
|
if (namelen == 1 && pname[0] == '.') {
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
pn = pd;
|
|
*vpp = dvp;
|
|
VREF(dvp);
|
|
return (0);
|
|
}
|
|
|
|
/* parent */
|
|
if (cnp->cn_flags & ISDOTDOT) {
|
|
if (dvp->v_vflag & VV_ROOT)
|
|
return (EIO);
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
VOP_UNLOCK(dvp, 0);
|
|
KASSERT(pd->mn_parent, ("non-root directory has no parent"));
|
|
pn = pd->mn_parent;
|
|
error = mqfs_allocv(dvp->v_mount, vpp, pn);
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
}
|
|
|
|
/* named node */
|
|
sx_xlock(&mqfs->mi_lock);
|
|
pn = mqfs_search(pd, pname, namelen, cnp->cn_cred);
|
|
if (pn != NULL)
|
|
mqnode_addref(pn);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
|
|
/* found */
|
|
if (pn != NULL) {
|
|
/* DELETE */
|
|
if (nameiop == DELETE && (flags & ISLASTCN)) {
|
|
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
|
|
if (error) {
|
|
mqnode_release(pn);
|
|
return (error);
|
|
}
|
|
if (*vpp == dvp) {
|
|
VREF(dvp);
|
|
*vpp = dvp;
|
|
mqnode_release(pn);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/* allocate vnode */
|
|
error = mqfs_allocv(dvp->v_mount, vpp, pn);
|
|
mqnode_release(pn);
|
|
if (error == 0 && cnp->cn_flags & MAKEENTRY)
|
|
cache_enter(dvp, *vpp, cnp);
|
|
return (error);
|
|
}
|
|
|
|
/* not found */
|
|
|
|
/* will create a new entry in the directory ? */
|
|
if ((nameiop == CREATE || nameiop == RENAME) && (flags & LOCKPARENT)
|
|
&& (flags & ISLASTCN)) {
|
|
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
cnp->cn_flags |= SAVENAME;
|
|
return (EJUSTRETURN);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_lookup_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* vnode lookup operation
|
|
*/
|
|
static int
|
|
mqfs_lookup(struct vop_cachedlookup_args *ap)
|
|
{
|
|
int rc;
|
|
|
|
rc = mqfs_lookupx(ap);
|
|
return (rc);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_create_args {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* vnode creation operation
|
|
*/
|
|
static int
|
|
mqfs_create(struct vop_create_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct mqfs_node *pd;
|
|
struct mqfs_node *pn;
|
|
struct mqueue *mq;
|
|
int error;
|
|
|
|
pd = VTON(ap->a_dvp);
|
|
if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
|
|
return (ENOTDIR);
|
|
mq = mqueue_alloc(NULL);
|
|
if (mq == NULL)
|
|
return (EAGAIN);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("%s: no name", __func__);
|
|
pn = mqfs_create_file(pd, cnp->cn_nameptr, cnp->cn_namelen,
|
|
cnp->cn_cred, ap->a_vap->va_mode);
|
|
if (pn == NULL) {
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
error = ENOSPC;
|
|
} else {
|
|
mqnode_addref(pn);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
|
|
mqnode_release(pn);
|
|
if (error)
|
|
mqfs_destroy(pn);
|
|
else
|
|
pn->mn_data = mq;
|
|
}
|
|
if (error)
|
|
mqueue_free(mq);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Remove an entry
|
|
*/
|
|
static
|
|
int do_unlink(struct mqfs_node *pn, struct ucred *ucred)
|
|
{
|
|
struct mqfs_node *parent;
|
|
struct mqfs_vdata *vd;
|
|
int error = 0;
|
|
|
|
sx_assert(&pn->mn_info->mi_lock, SX_LOCKED);
|
|
|
|
if (ucred->cr_uid != pn->mn_uid &&
|
|
(error = priv_check_cred(ucred, PRIV_MQ_ADMIN, 0)) != 0)
|
|
error = EACCES;
|
|
else if (!pn->mn_deleted) {
|
|
parent = pn->mn_parent;
|
|
pn->mn_parent = NULL;
|
|
pn->mn_deleted = 1;
|
|
LIST_REMOVE(pn, mn_sibling);
|
|
LIST_FOREACH(vd, &pn->mn_vnodes, mv_link) {
|
|
cache_purge(vd->mv_vnode);
|
|
vhold(vd->mv_vnode);
|
|
taskqueue_enqueue(taskqueue_thread, &vd->mv_task);
|
|
}
|
|
mqnode_release(pn);
|
|
mqnode_release(parent);
|
|
} else
|
|
error = ENOENT;
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_remove_args {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* vnode removal operation
|
|
*/
|
|
static int
|
|
mqfs_remove(struct vop_remove_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
if (ap->a_vp->v_type == VDIR)
|
|
return (EPERM);
|
|
pn = VTON(ap->a_vp);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
error = do_unlink(pn, ap->a_cnp->cn_cred);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_inactive_args {
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_inactive(struct vop_inactive_args *ap)
|
|
{
|
|
struct mqfs_node *pn = VTON(ap->a_vp);
|
|
|
|
if (pn->mn_deleted)
|
|
vrecycle(ap->a_vp);
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_reclaim_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_vp->v_mount);
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mqfs_node *pn;
|
|
struct mqfs_vdata *vd;
|
|
|
|
vd = vp->v_data;
|
|
pn = vd->mv_node;
|
|
sx_xlock(&mqfs->mi_lock);
|
|
vp->v_data = NULL;
|
|
LIST_REMOVE(vd, mv_link);
|
|
uma_zfree(mvdata_zone, vd);
|
|
mqnode_release(pn);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_open_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
struct file *a_fp;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_open(struct vop_open_args *ap)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_close_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqfs_close(struct vop_close_args *ap)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_access_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
accmode_t a_accmode;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Verify permissions
|
|
*/
|
|
static int
|
|
mqfs_access(struct vop_access_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vattr vattr;
|
|
int error;
|
|
|
|
error = VOP_GETATTR(vp, &vattr, ap->a_cred);
|
|
if (error)
|
|
return (error);
|
|
error = vaccess(vp->v_type, vattr.va_mode, vattr.va_uid,
|
|
vattr.va_gid, ap->a_accmode, ap->a_cred, NULL);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_getattr_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Get file attributes
|
|
*/
|
|
static int
|
|
mqfs_getattr(struct vop_getattr_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mqfs_node *pn = VTON(vp);
|
|
struct vattr *vap = ap->a_vap;
|
|
int error = 0;
|
|
|
|
vap->va_type = vp->v_type;
|
|
vap->va_mode = pn->mn_mode;
|
|
vap->va_nlink = 1;
|
|
vap->va_uid = pn->mn_uid;
|
|
vap->va_gid = pn->mn_gid;
|
|
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
|
|
vap->va_fileid = pn->mn_fileno;
|
|
vap->va_size = 0;
|
|
vap->va_blocksize = PAGE_SIZE;
|
|
vap->va_bytes = vap->va_size = 0;
|
|
vap->va_atime = pn->mn_atime;
|
|
vap->va_mtime = pn->mn_mtime;
|
|
vap->va_ctime = pn->mn_ctime;
|
|
vap->va_birthtime = pn->mn_birth;
|
|
vap->va_gen = 0;
|
|
vap->va_flags = 0;
|
|
vap->va_rdev = NODEV;
|
|
vap->va_bytes = 0;
|
|
vap->va_filerev = 0;
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_setattr_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
};
|
|
#endif
|
|
/*
|
|
* Set attributes
|
|
*/
|
|
static int
|
|
mqfs_setattr(struct vop_setattr_args *ap)
|
|
{
|
|
struct mqfs_node *pn;
|
|
struct vattr *vap;
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
int c, error;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
td = curthread;
|
|
vap = ap->a_vap;
|
|
vp = ap->a_vp;
|
|
if ((vap->va_type != VNON) ||
|
|
(vap->va_nlink != VNOVAL) ||
|
|
(vap->va_fsid != VNOVAL) ||
|
|
(vap->va_fileid != VNOVAL) ||
|
|
(vap->va_blocksize != VNOVAL) ||
|
|
(vap->va_flags != VNOVAL && vap->va_flags != 0) ||
|
|
(vap->va_rdev != VNOVAL) ||
|
|
((int)vap->va_bytes != VNOVAL) ||
|
|
(vap->va_gen != VNOVAL)) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
pn = VTON(vp);
|
|
|
|
error = c = 0;
|
|
if (vap->va_uid == (uid_t)VNOVAL)
|
|
uid = pn->mn_uid;
|
|
else
|
|
uid = vap->va_uid;
|
|
if (vap->va_gid == (gid_t)VNOVAL)
|
|
gid = pn->mn_gid;
|
|
else
|
|
gid = vap->va_gid;
|
|
|
|
if (uid != pn->mn_uid || gid != pn->mn_gid) {
|
|
/*
|
|
* To modify the ownership of a file, must possess VADMIN
|
|
* for that file.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)))
|
|
return (error);
|
|
|
|
/*
|
|
* XXXRW: Why is there a privilege check here: shouldn't the
|
|
* check in VOP_ACCESS() be enough? Also, are the group bits
|
|
* below definitely right?
|
|
*/
|
|
if (((ap->a_cred->cr_uid != pn->mn_uid) || uid != pn->mn_uid ||
|
|
(gid != pn->mn_gid && !groupmember(gid, ap->a_cred))) &&
|
|
(error = priv_check(td, PRIV_MQ_ADMIN)) != 0)
|
|
return (error);
|
|
pn->mn_uid = uid;
|
|
pn->mn_gid = gid;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_mode != (mode_t)VNOVAL) {
|
|
if ((ap->a_cred->cr_uid != pn->mn_uid) &&
|
|
(error = priv_check(td, PRIV_MQ_ADMIN)))
|
|
return (error);
|
|
pn->mn_mode = vap->va_mode;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
|
|
/* See the comment in ufs_vnops::ufs_setattr(). */
|
|
if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
|
|
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
|
|
(error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
|
|
return (error);
|
|
if (vap->va_atime.tv_sec != VNOVAL) {
|
|
pn->mn_atime = vap->va_atime;
|
|
}
|
|
if (vap->va_mtime.tv_sec != VNOVAL) {
|
|
pn->mn_mtime = vap->va_mtime;
|
|
}
|
|
c = 1;
|
|
}
|
|
if (c) {
|
|
vfs_timestamp(&pn->mn_ctime);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_read_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Read from a file
|
|
*/
|
|
static int
|
|
mqfs_read(struct vop_read_args *ap)
|
|
{
|
|
char buf[80];
|
|
struct vnode *vp = ap->a_vp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct mqfs_node *pn;
|
|
struct mqueue *mq;
|
|
int len, error;
|
|
|
|
if (vp->v_type != VREG)
|
|
return (EINVAL);
|
|
|
|
pn = VTON(vp);
|
|
mq = VTOMQ(vp);
|
|
snprintf(buf, sizeof(buf),
|
|
"QSIZE:%-10ld MAXMSG:%-10ld CURMSG:%-10ld MSGSIZE:%-10ld\n",
|
|
mq->mq_totalbytes,
|
|
mq->mq_maxmsg,
|
|
mq->mq_curmsgs,
|
|
mq->mq_msgsize);
|
|
buf[sizeof(buf)-1] = '\0';
|
|
len = strlen(buf);
|
|
error = uiomove_frombuf(buf, len, uio);
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_readdir_args {
|
|
struct vop_generic_args a_gen;
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
int *a_eofflag;
|
|
int *a_ncookies;
|
|
u_long **a_cookies;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Return directory entries.
|
|
*/
|
|
static int
|
|
mqfs_readdir(struct vop_readdir_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct mqfs_info *mi;
|
|
struct mqfs_node *pd;
|
|
struct mqfs_node *pn;
|
|
struct dirent entry;
|
|
struct uio *uio;
|
|
const void *pr_root;
|
|
int *tmp_ncookies = NULL;
|
|
off_t offset;
|
|
int error, i;
|
|
|
|
vp = ap->a_vp;
|
|
mi = VFSTOMQFS(vp->v_mount);
|
|
pd = VTON(vp);
|
|
uio = ap->a_uio;
|
|
|
|
if (vp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
if (ap->a_ncookies != NULL) {
|
|
tmp_ncookies = ap->a_ncookies;
|
|
*ap->a_ncookies = 0;
|
|
ap->a_ncookies = NULL;
|
|
}
|
|
|
|
error = 0;
|
|
offset = 0;
|
|
|
|
pr_root = ap->a_cred->cr_prison->pr_root;
|
|
sx_xlock(&mi->mi_lock);
|
|
|
|
LIST_FOREACH(pn, &pd->mn_children, mn_sibling) {
|
|
entry.d_reclen = sizeof(entry);
|
|
|
|
/*
|
|
* Only show names within the same prison root directory
|
|
* (or not associated with a prison, e.g. "." and "..").
|
|
*/
|
|
if (pn->mn_pr_root != NULL && pn->mn_pr_root != pr_root)
|
|
continue;
|
|
if (!pn->mn_fileno)
|
|
mqfs_fileno_alloc(mi, pn);
|
|
entry.d_fileno = pn->mn_fileno;
|
|
for (i = 0; i < MQFS_NAMELEN - 1 && pn->mn_name[i] != '\0'; ++i)
|
|
entry.d_name[i] = pn->mn_name[i];
|
|
entry.d_name[i] = 0;
|
|
entry.d_namlen = i;
|
|
switch (pn->mn_type) {
|
|
case mqfstype_root:
|
|
case mqfstype_dir:
|
|
case mqfstype_this:
|
|
case mqfstype_parent:
|
|
entry.d_type = DT_DIR;
|
|
break;
|
|
case mqfstype_file:
|
|
entry.d_type = DT_REG;
|
|
break;
|
|
case mqfstype_symlink:
|
|
entry.d_type = DT_LNK;
|
|
break;
|
|
default:
|
|
panic("%s has unexpected node type: %d", pn->mn_name,
|
|
pn->mn_type);
|
|
}
|
|
if (entry.d_reclen > uio->uio_resid)
|
|
break;
|
|
if (offset >= uio->uio_offset) {
|
|
error = vfs_read_dirent(ap, &entry, offset);
|
|
if (error)
|
|
break;
|
|
}
|
|
offset += entry.d_reclen;
|
|
}
|
|
sx_xunlock(&mi->mi_lock);
|
|
|
|
uio->uio_offset = offset;
|
|
|
|
if (tmp_ncookies != NULL)
|
|
ap->a_ncookies = tmp_ncookies;
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifdef notyet
|
|
|
|
#if 0
|
|
struct vop_mkdir_args {
|
|
struct vnode *a_dvp;
|
|
struvt vnode **a_vpp;
|
|
struvt componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Create a directory.
|
|
*/
|
|
static int
|
|
mqfs_mkdir(struct vop_mkdir_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct mqfs_node *pd = VTON(ap->a_dvp);
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
if (pd->mn_type != mqfstype_root && pd->mn_type != mqfstype_dir)
|
|
return (ENOTDIR);
|
|
sx_xlock(&mqfs->mi_lock);
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("%s: no name", __func__);
|
|
pn = mqfs_create_dir(pd, cnp->cn_nameptr, cnp->cn_namelen,
|
|
ap->a_vap->cn_cred, ap->a_vap->va_mode);
|
|
if (pn != NULL)
|
|
mqnode_addref(pn);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
if (pn == NULL) {
|
|
error = ENOSPC;
|
|
} else {
|
|
error = mqfs_allocv(ap->a_dvp->v_mount, ap->a_vpp, pn);
|
|
mqnode_release(pn);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#if 0
|
|
struct vop_rmdir_args {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* Remove a directory.
|
|
*/
|
|
static int
|
|
mqfs_rmdir(struct vop_rmdir_args *ap)
|
|
{
|
|
struct mqfs_info *mqfs = VFSTOMQFS(ap->a_dvp->v_mount);
|
|
struct mqfs_node *pn = VTON(ap->a_vp);
|
|
struct mqfs_node *pt;
|
|
|
|
if (pn->mn_type != mqfstype_dir)
|
|
return (ENOTDIR);
|
|
|
|
sx_xlock(&mqfs->mi_lock);
|
|
if (pn->mn_deleted) {
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (ENOENT);
|
|
}
|
|
|
|
pt = LIST_FIRST(&pn->mn_children);
|
|
pt = LIST_NEXT(pt, mn_sibling);
|
|
pt = LIST_NEXT(pt, mn_sibling);
|
|
if (pt != NULL) {
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
return (ENOTEMPTY);
|
|
}
|
|
pt = pn->mn_parent;
|
|
pn->mn_parent = NULL;
|
|
pn->mn_deleted = 1;
|
|
LIST_REMOVE(pn, mn_sibling);
|
|
mqnode_release(pn);
|
|
mqnode_release(pt);
|
|
sx_xunlock(&mqfs->mi_lock);
|
|
cache_purge(ap->a_vp);
|
|
return (0);
|
|
}
|
|
|
|
#endif /* notyet */
|
|
|
|
/*
|
|
* See if this prison root is obsolete, and clean up associated queues if it is.
|
|
*/
|
|
static int
|
|
mqfs_prison_remove(void *obj, void *data __unused)
|
|
{
|
|
const struct prison *pr = obj;
|
|
const struct prison *tpr;
|
|
struct mqfs_node *pn, *tpn;
|
|
int found;
|
|
|
|
found = 0;
|
|
TAILQ_FOREACH(tpr, &allprison, pr_list) {
|
|
if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0)
|
|
found = 1;
|
|
}
|
|
if (!found) {
|
|
/*
|
|
* No jails are rooted in this directory anymore,
|
|
* so no queues should be either.
|
|
*/
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
LIST_FOREACH_SAFE(pn, &mqfs_data.mi_root->mn_children,
|
|
mn_sibling, tpn) {
|
|
if (pn->mn_pr_root == pr->pr_root)
|
|
(void)do_unlink(pn, curthread->td_ucred);
|
|
}
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate a message queue
|
|
*/
|
|
static struct mqueue *
|
|
mqueue_alloc(const struct mq_attr *attr)
|
|
{
|
|
struct mqueue *mq;
|
|
|
|
if (curmq >= maxmq)
|
|
return (NULL);
|
|
mq = uma_zalloc(mqueue_zone, M_WAITOK | M_ZERO);
|
|
TAILQ_INIT(&mq->mq_msgq);
|
|
if (attr != NULL) {
|
|
mq->mq_maxmsg = attr->mq_maxmsg;
|
|
mq->mq_msgsize = attr->mq_msgsize;
|
|
} else {
|
|
mq->mq_maxmsg = default_maxmsg;
|
|
mq->mq_msgsize = default_msgsize;
|
|
}
|
|
mtx_init(&mq->mq_mutex, "mqueue lock", NULL, MTX_DEF);
|
|
knlist_init_mtx(&mq->mq_rsel.si_note, &mq->mq_mutex);
|
|
knlist_init_mtx(&mq->mq_wsel.si_note, &mq->mq_mutex);
|
|
atomic_add_int(&curmq, 1);
|
|
return (mq);
|
|
}
|
|
|
|
/*
|
|
* Destroy a message queue
|
|
*/
|
|
static void
|
|
mqueue_free(struct mqueue *mq)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
|
|
while ((msg = TAILQ_FIRST(&mq->mq_msgq)) != NULL) {
|
|
TAILQ_REMOVE(&mq->mq_msgq, msg, msg_link);
|
|
free(msg, M_MQUEUEDATA);
|
|
}
|
|
|
|
mtx_destroy(&mq->mq_mutex);
|
|
seldrain(&mq->mq_rsel);
|
|
seldrain(&mq->mq_wsel);
|
|
knlist_destroy(&mq->mq_rsel.si_note);
|
|
knlist_destroy(&mq->mq_wsel.si_note);
|
|
uma_zfree(mqueue_zone, mq);
|
|
atomic_add_int(&curmq, -1);
|
|
}
|
|
|
|
/*
|
|
* Load a message from user space
|
|
*/
|
|
static struct mqueue_msg *
|
|
mqueue_loadmsg(const char *msg_ptr, size_t msg_size, int msg_prio)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
size_t len;
|
|
int error;
|
|
|
|
len = sizeof(struct mqueue_msg) + msg_size;
|
|
msg = malloc(len, M_MQUEUEDATA, M_WAITOK);
|
|
error = copyin(msg_ptr, ((char *)msg) + sizeof(struct mqueue_msg),
|
|
msg_size);
|
|
if (error) {
|
|
free(msg, M_MQUEUEDATA);
|
|
msg = NULL;
|
|
} else {
|
|
msg->msg_size = msg_size;
|
|
msg->msg_prio = msg_prio;
|
|
}
|
|
return (msg);
|
|
}
|
|
|
|
/*
|
|
* Save a message to user space
|
|
*/
|
|
static int
|
|
mqueue_savemsg(struct mqueue_msg *msg, char *msg_ptr, int *msg_prio)
|
|
{
|
|
int error;
|
|
|
|
error = copyout(((char *)msg) + sizeof(*msg), msg_ptr,
|
|
msg->msg_size);
|
|
if (error == 0 && msg_prio != NULL)
|
|
error = copyout(&msg->msg_prio, msg_prio, sizeof(int));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Free a message's memory
|
|
*/
|
|
static __inline void
|
|
mqueue_freemsg(struct mqueue_msg *msg)
|
|
{
|
|
free(msg, M_MQUEUEDATA);
|
|
}
|
|
|
|
/*
|
|
* Send a message. if waitok is false, thread will not be
|
|
* blocked if there is no data in queue, otherwise, absolute
|
|
* time will be checked.
|
|
*/
|
|
int
|
|
mqueue_send(struct mqueue *mq, const char *msg_ptr,
|
|
size_t msg_len, unsigned msg_prio, int waitok,
|
|
const struct timespec *abs_timeout)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
struct timespec ts, ts2;
|
|
struct timeval tv;
|
|
int error;
|
|
|
|
if (msg_prio >= MQ_PRIO_MAX)
|
|
return (EINVAL);
|
|
if (msg_len > mq->mq_msgsize)
|
|
return (EMSGSIZE);
|
|
msg = mqueue_loadmsg(msg_ptr, msg_len, msg_prio);
|
|
if (msg == NULL)
|
|
return (EFAULT);
|
|
|
|
/* O_NONBLOCK case */
|
|
if (!waitok) {
|
|
error = _mqueue_send(mq, msg, -1);
|
|
if (error)
|
|
goto bad;
|
|
return (0);
|
|
}
|
|
|
|
/* we allow a null timeout (wait forever) */
|
|
if (abs_timeout == NULL) {
|
|
error = _mqueue_send(mq, msg, 0);
|
|
if (error)
|
|
goto bad;
|
|
return (0);
|
|
}
|
|
|
|
/* send it before checking time */
|
|
error = _mqueue_send(mq, msg, -1);
|
|
if (error == 0)
|
|
return (0);
|
|
|
|
if (error != EAGAIN)
|
|
goto bad;
|
|
|
|
if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
for (;;) {
|
|
ts2 = *abs_timeout;
|
|
getnanotime(&ts);
|
|
timespecsub(&ts2, &ts);
|
|
if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
|
|
error = ETIMEDOUT;
|
|
break;
|
|
}
|
|
TIMESPEC_TO_TIMEVAL(&tv, &ts2);
|
|
error = _mqueue_send(mq, msg, tvtohz(&tv));
|
|
if (error != ETIMEDOUT)
|
|
break;
|
|
}
|
|
if (error == 0)
|
|
return (0);
|
|
bad:
|
|
mqueue_freemsg(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common routine to send a message
|
|
*/
|
|
static int
|
|
_mqueue_send(struct mqueue *mq, struct mqueue_msg *msg, int timo)
|
|
{
|
|
struct mqueue_msg *msg2;
|
|
int error = 0;
|
|
|
|
mtx_lock(&mq->mq_mutex);
|
|
while (mq->mq_curmsgs >= mq->mq_maxmsg && error == 0) {
|
|
if (timo < 0) {
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (EAGAIN);
|
|
}
|
|
mq->mq_senders++;
|
|
error = msleep(&mq->mq_senders, &mq->mq_mutex,
|
|
PCATCH, "mqsend", timo);
|
|
mq->mq_senders--;
|
|
if (error == EAGAIN)
|
|
error = ETIMEDOUT;
|
|
}
|
|
if (mq->mq_curmsgs >= mq->mq_maxmsg) {
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (error);
|
|
}
|
|
error = 0;
|
|
if (TAILQ_EMPTY(&mq->mq_msgq)) {
|
|
TAILQ_INSERT_HEAD(&mq->mq_msgq, msg, msg_link);
|
|
} else {
|
|
if (msg->msg_prio <= TAILQ_LAST(&mq->mq_msgq, msgq)->msg_prio) {
|
|
TAILQ_INSERT_TAIL(&mq->mq_msgq, msg, msg_link);
|
|
} else {
|
|
TAILQ_FOREACH(msg2, &mq->mq_msgq, msg_link) {
|
|
if (msg2->msg_prio < msg->msg_prio)
|
|
break;
|
|
}
|
|
TAILQ_INSERT_BEFORE(msg2, msg, msg_link);
|
|
}
|
|
}
|
|
mq->mq_curmsgs++;
|
|
mq->mq_totalbytes += msg->msg_size;
|
|
if (mq->mq_receivers)
|
|
wakeup_one(&mq->mq_receivers);
|
|
else if (mq->mq_notifier != NULL)
|
|
mqueue_send_notification(mq);
|
|
if (mq->mq_flags & MQ_RSEL) {
|
|
mq->mq_flags &= ~MQ_RSEL;
|
|
selwakeup(&mq->mq_rsel);
|
|
}
|
|
KNOTE_LOCKED(&mq->mq_rsel.si_note, 0);
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Send realtime a signal to process which registered itself
|
|
* successfully by mq_notify.
|
|
*/
|
|
static void
|
|
mqueue_send_notification(struct mqueue *mq)
|
|
{
|
|
struct mqueue_notifier *nt;
|
|
struct thread *td;
|
|
struct proc *p;
|
|
int error;
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
nt = mq->mq_notifier;
|
|
if (nt->nt_sigev.sigev_notify != SIGEV_NONE) {
|
|
p = nt->nt_proc;
|
|
error = sigev_findtd(p, &nt->nt_sigev, &td);
|
|
if (error) {
|
|
mq->mq_notifier = NULL;
|
|
return;
|
|
}
|
|
if (!KSI_ONQ(&nt->nt_ksi)) {
|
|
ksiginfo_set_sigev(&nt->nt_ksi, &nt->nt_sigev);
|
|
tdsendsignal(p, td, nt->nt_ksi.ksi_signo, &nt->nt_ksi);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
mq->mq_notifier = NULL;
|
|
}
|
|
|
|
/*
|
|
* Get a message. if waitok is false, thread will not be
|
|
* blocked if there is no data in queue, otherwise, absolute
|
|
* time will be checked.
|
|
*/
|
|
int
|
|
mqueue_receive(struct mqueue *mq, char *msg_ptr,
|
|
size_t msg_len, unsigned *msg_prio, int waitok,
|
|
const struct timespec *abs_timeout)
|
|
{
|
|
struct mqueue_msg *msg;
|
|
struct timespec ts, ts2;
|
|
struct timeval tv;
|
|
int error;
|
|
|
|
if (msg_len < mq->mq_msgsize)
|
|
return (EMSGSIZE);
|
|
|
|
/* O_NONBLOCK case */
|
|
if (!waitok) {
|
|
error = _mqueue_recv(mq, &msg, -1);
|
|
if (error)
|
|
return (error);
|
|
goto received;
|
|
}
|
|
|
|
/* we allow a null timeout (wait forever). */
|
|
if (abs_timeout == NULL) {
|
|
error = _mqueue_recv(mq, &msg, 0);
|
|
if (error)
|
|
return (error);
|
|
goto received;
|
|
}
|
|
|
|
/* try to get a message before checking time */
|
|
error = _mqueue_recv(mq, &msg, -1);
|
|
if (error == 0)
|
|
goto received;
|
|
|
|
if (error != EAGAIN)
|
|
return (error);
|
|
|
|
if (abs_timeout->tv_nsec >= 1000000000 || abs_timeout->tv_nsec < 0) {
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|
|
|
|
for (;;) {
|
|
ts2 = *abs_timeout;
|
|
getnanotime(&ts);
|
|
timespecsub(&ts2, &ts);
|
|
if (ts2.tv_sec < 0 || (ts2.tv_sec == 0 && ts2.tv_nsec <= 0)) {
|
|
error = ETIMEDOUT;
|
|
return (error);
|
|
}
|
|
TIMESPEC_TO_TIMEVAL(&tv, &ts2);
|
|
error = _mqueue_recv(mq, &msg, tvtohz(&tv));
|
|
if (error == 0)
|
|
break;
|
|
if (error != ETIMEDOUT)
|
|
return (error);
|
|
}
|
|
|
|
received:
|
|
error = mqueue_savemsg(msg, msg_ptr, msg_prio);
|
|
if (error == 0) {
|
|
curthread->td_retval[0] = msg->msg_size;
|
|
curthread->td_retval[1] = 0;
|
|
}
|
|
mqueue_freemsg(msg);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common routine to receive a message
|
|
*/
|
|
static int
|
|
_mqueue_recv(struct mqueue *mq, struct mqueue_msg **msg, int timo)
|
|
{
|
|
int error = 0;
|
|
|
|
mtx_lock(&mq->mq_mutex);
|
|
while ((*msg = TAILQ_FIRST(&mq->mq_msgq)) == NULL && error == 0) {
|
|
if (timo < 0) {
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (EAGAIN);
|
|
}
|
|
mq->mq_receivers++;
|
|
error = msleep(&mq->mq_receivers, &mq->mq_mutex,
|
|
PCATCH, "mqrecv", timo);
|
|
mq->mq_receivers--;
|
|
if (error == EAGAIN)
|
|
error = ETIMEDOUT;
|
|
}
|
|
if (*msg != NULL) {
|
|
error = 0;
|
|
TAILQ_REMOVE(&mq->mq_msgq, *msg, msg_link);
|
|
mq->mq_curmsgs--;
|
|
mq->mq_totalbytes -= (*msg)->msg_size;
|
|
if (mq->mq_senders)
|
|
wakeup_one(&mq->mq_senders);
|
|
if (mq->mq_flags & MQ_WSEL) {
|
|
mq->mq_flags &= ~MQ_WSEL;
|
|
selwakeup(&mq->mq_wsel);
|
|
}
|
|
KNOTE_LOCKED(&mq->mq_wsel.si_note, 0);
|
|
}
|
|
if (mq->mq_notifier != NULL && mq->mq_receivers == 0 &&
|
|
!TAILQ_EMPTY(&mq->mq_msgq)) {
|
|
mqueue_send_notification(mq);
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (error);
|
|
}
|
|
|
|
static __inline struct mqueue_notifier *
|
|
notifier_alloc(void)
|
|
{
|
|
return (uma_zalloc(mqnoti_zone, M_WAITOK | M_ZERO));
|
|
}
|
|
|
|
static __inline void
|
|
notifier_free(struct mqueue_notifier *p)
|
|
{
|
|
uma_zfree(mqnoti_zone, p);
|
|
}
|
|
|
|
static struct mqueue_notifier *
|
|
notifier_search(struct proc *p, int fd)
|
|
{
|
|
struct mqueue_notifier *nt;
|
|
|
|
LIST_FOREACH(nt, &p->p_mqnotifier, nt_link) {
|
|
if (nt->nt_ksi.ksi_mqd == fd)
|
|
break;
|
|
}
|
|
return (nt);
|
|
}
|
|
|
|
static __inline void
|
|
notifier_insert(struct proc *p, struct mqueue_notifier *nt)
|
|
{
|
|
LIST_INSERT_HEAD(&p->p_mqnotifier, nt, nt_link);
|
|
}
|
|
|
|
static __inline void
|
|
notifier_delete(struct proc *p, struct mqueue_notifier *nt)
|
|
{
|
|
LIST_REMOVE(nt, nt_link);
|
|
notifier_free(nt);
|
|
}
|
|
|
|
static void
|
|
notifier_remove(struct proc *p, struct mqueue *mq, int fd)
|
|
{
|
|
struct mqueue_notifier *nt;
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
PROC_LOCK(p);
|
|
nt = notifier_search(p, fd);
|
|
if (nt != NULL) {
|
|
if (mq->mq_notifier == nt)
|
|
mq->mq_notifier = NULL;
|
|
sigqueue_take(&nt->nt_ksi);
|
|
notifier_delete(p, nt);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
static int
|
|
kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
|
|
const struct mq_attr *attr)
|
|
{
|
|
char path[MQFS_NAMELEN + 1];
|
|
struct mqfs_node *pn;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct mqueue *mq;
|
|
int fd, error, len, cmode;
|
|
|
|
AUDIT_ARG_FFLAGS(flags);
|
|
AUDIT_ARG_MODE(mode);
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
|
|
mq = NULL;
|
|
if ((flags & O_CREAT) != 0 && attr != NULL) {
|
|
if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > maxmsg)
|
|
return (EINVAL);
|
|
if (attr->mq_msgsize <= 0 || attr->mq_msgsize > maxmsgsize)
|
|
return (EINVAL);
|
|
}
|
|
|
|
error = copyinstr(upath, path, MQFS_NAMELEN + 1, NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* The first character of name must be a slash (/) character
|
|
* and the remaining characters of name cannot include any slash
|
|
* characters.
|
|
*/
|
|
len = strlen(path);
|
|
if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
|
|
return (EINVAL);
|
|
AUDIT_ARG_UPATH1_CANON(path);
|
|
|
|
error = falloc(td, &fp, &fd, O_CLOEXEC);
|
|
if (error)
|
|
return (error);
|
|
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
|
|
if (pn == NULL) {
|
|
if (!(flags & O_CREAT)) {
|
|
error = ENOENT;
|
|
} else {
|
|
mq = mqueue_alloc(attr);
|
|
if (mq == NULL) {
|
|
error = ENFILE;
|
|
} else {
|
|
pn = mqfs_create_file(mqfs_data.mi_root,
|
|
path + 1, len - 1, td->td_ucred,
|
|
cmode);
|
|
if (pn == NULL) {
|
|
error = ENOSPC;
|
|
mqueue_free(mq);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (error == 0) {
|
|
pn->mn_data = mq;
|
|
}
|
|
} else {
|
|
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) {
|
|
error = EEXIST;
|
|
} else {
|
|
accmode_t accmode = 0;
|
|
|
|
if (flags & FREAD)
|
|
accmode |= VREAD;
|
|
if (flags & FWRITE)
|
|
accmode |= VWRITE;
|
|
error = vaccess(VREG, pn->mn_mode, pn->mn_uid,
|
|
pn->mn_gid, accmode, td->td_ucred, NULL);
|
|
}
|
|
}
|
|
|
|
if (error) {
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
fdclose(td, fp, fd);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
mqnode_addref(pn);
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
|
|
finit(fp, flags & (FREAD | FWRITE | O_NONBLOCK), DTYPE_MQUEUE, pn,
|
|
&mqueueops);
|
|
|
|
td->td_retval[0] = fd;
|
|
fdrop(fp, td);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Syscall to open a message queue.
|
|
*/
|
|
int
|
|
sys_kmq_open(struct thread *td, struct kmq_open_args *uap)
|
|
{
|
|
struct mq_attr attr;
|
|
int flags, error;
|
|
|
|
if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
|
|
return (EINVAL);
|
|
flags = FFLAGS(uap->flags);
|
|
if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
|
|
error = copyin(uap->attr, &attr, sizeof(attr));
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (kern_kmq_open(td, uap->path, flags, uap->mode,
|
|
uap->attr != NULL ? &attr : NULL));
|
|
}
|
|
|
|
/*
|
|
* Syscall to unlink a message queue.
|
|
*/
|
|
int
|
|
sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
|
|
{
|
|
char path[MQFS_NAMELEN+1];
|
|
struct mqfs_node *pn;
|
|
int error, len;
|
|
|
|
error = copyinstr(uap->path, path, MQFS_NAMELEN + 1, NULL);
|
|
if (error)
|
|
return (error);
|
|
|
|
len = strlen(path);
|
|
if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
|
|
return (EINVAL);
|
|
AUDIT_ARG_UPATH1_CANON(path);
|
|
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
|
|
if (pn != NULL)
|
|
error = do_unlink(pn, td->td_ucred);
|
|
else
|
|
error = ENOENT;
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
typedef int (*_fgetf)(struct thread *, int, cap_rights_t *, struct file **);
|
|
|
|
/*
|
|
* Get message queue by giving file slot
|
|
*/
|
|
static int
|
|
_getmq(struct thread *td, int fd, cap_rights_t *rightsp, _fgetf func,
|
|
struct file **fpp, struct mqfs_node **ppn, struct mqueue **pmq)
|
|
{
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
error = func(td, fd, rightsp, fpp);
|
|
if (error)
|
|
return (error);
|
|
if (&mqueueops != (*fpp)->f_ops) {
|
|
fdrop(*fpp, td);
|
|
return (EBADF);
|
|
}
|
|
pn = (*fpp)->f_data;
|
|
if (ppn)
|
|
*ppn = pn;
|
|
if (pmq)
|
|
*pmq = pn->mn_data;
|
|
return (0);
|
|
}
|
|
|
|
static __inline int
|
|
getmq(struct thread *td, int fd, struct file **fpp, struct mqfs_node **ppn,
|
|
struct mqueue **pmq)
|
|
{
|
|
cap_rights_t rights;
|
|
|
|
return _getmq(td, fd, cap_rights_init(&rights, CAP_EVENT), fget,
|
|
fpp, ppn, pmq);
|
|
}
|
|
|
|
static __inline int
|
|
getmq_read(struct thread *td, int fd, struct file **fpp,
|
|
struct mqfs_node **ppn, struct mqueue **pmq)
|
|
{
|
|
cap_rights_t rights;
|
|
|
|
return _getmq(td, fd, cap_rights_init(&rights, CAP_READ), fget_read,
|
|
fpp, ppn, pmq);
|
|
}
|
|
|
|
static __inline int
|
|
getmq_write(struct thread *td, int fd, struct file **fpp,
|
|
struct mqfs_node **ppn, struct mqueue **pmq)
|
|
{
|
|
cap_rights_t rights;
|
|
|
|
return _getmq(td, fd, cap_rights_init(&rights, CAP_WRITE), fget_write,
|
|
fpp, ppn, pmq);
|
|
}
|
|
|
|
static int
|
|
kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
|
|
struct mq_attr *oattr)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
u_int oflag, flag;
|
|
int error;
|
|
|
|
AUDIT_ARG_FD(mqd);
|
|
if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
|
|
return (EINVAL);
|
|
error = getmq(td, mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
oattr->mq_maxmsg = mq->mq_maxmsg;
|
|
oattr->mq_msgsize = mq->mq_msgsize;
|
|
oattr->mq_curmsgs = mq->mq_curmsgs;
|
|
if (attr != NULL) {
|
|
do {
|
|
oflag = flag = fp->f_flag;
|
|
flag &= ~O_NONBLOCK;
|
|
flag |= (attr->mq_flags & O_NONBLOCK);
|
|
} while (atomic_cmpset_int(&fp->f_flag, oflag, flag) == 0);
|
|
} else
|
|
oflag = fp->f_flag;
|
|
oattr->mq_flags = (O_NONBLOCK & oflag);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sys_kmq_setattr(struct thread *td, struct kmq_setattr_args *uap)
|
|
{
|
|
struct mq_attr attr, oattr;
|
|
int error;
|
|
|
|
if (uap->attr != NULL) {
|
|
error = copyin(uap->attr, &attr, sizeof(attr));
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
|
|
&oattr);
|
|
if (error == 0 && uap->oattr != NULL) {
|
|
bzero(oattr.__reserved, sizeof(oattr.__reserved));
|
|
error = copyout(&oattr, uap->oattr, sizeof(oattr));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
struct timespec *abs_timeout, ets;
|
|
int error;
|
|
int waitok;
|
|
|
|
AUDIT_ARG_FD(uap->mqd);
|
|
error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
if (uap->abs_timeout != NULL) {
|
|
error = copyin(uap->abs_timeout, &ets, sizeof(ets));
|
|
if (error != 0)
|
|
return (error);
|
|
abs_timeout = &ets;
|
|
} else
|
|
abs_timeout = NULL;
|
|
waitok = !(fp->f_flag & O_NONBLOCK);
|
|
error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
|
|
uap->msg_prio, waitok, abs_timeout);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
struct timespec *abs_timeout, ets;
|
|
int error, waitok;
|
|
|
|
AUDIT_ARG_FD(uap->mqd);
|
|
error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
if (uap->abs_timeout != NULL) {
|
|
error = copyin(uap->abs_timeout, &ets, sizeof(ets));
|
|
if (error != 0)
|
|
return (error);
|
|
abs_timeout = &ets;
|
|
} else
|
|
abs_timeout = NULL;
|
|
waitok = !(fp->f_flag & O_NONBLOCK);
|
|
error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
|
|
uap->msg_prio, waitok, abs_timeout);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
|
|
{
|
|
#ifdef CAPABILITIES
|
|
cap_rights_t rights;
|
|
#endif
|
|
struct filedesc *fdp;
|
|
struct proc *p;
|
|
struct mqueue *mq;
|
|
struct file *fp, *fp2;
|
|
struct mqueue_notifier *nt, *newnt = NULL;
|
|
int error;
|
|
|
|
AUDIT_ARG_FD(mqd);
|
|
if (sigev != NULL) {
|
|
if (sigev->sigev_notify != SIGEV_SIGNAL &&
|
|
sigev->sigev_notify != SIGEV_THREAD_ID &&
|
|
sigev->sigev_notify != SIGEV_NONE)
|
|
return (EINVAL);
|
|
if ((sigev->sigev_notify == SIGEV_SIGNAL ||
|
|
sigev->sigev_notify == SIGEV_THREAD_ID) &&
|
|
!_SIG_VALID(sigev->sigev_signo))
|
|
return (EINVAL);
|
|
}
|
|
p = td->td_proc;
|
|
fdp = td->td_proc->p_fd;
|
|
error = getmq(td, mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
again:
|
|
FILEDESC_SLOCK(fdp);
|
|
fp2 = fget_locked(fdp, mqd);
|
|
if (fp2 == NULL) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
#ifdef CAPABILITIES
|
|
error = cap_check(cap_rights(fdp, mqd),
|
|
cap_rights_init(&rights, CAP_EVENT));
|
|
if (error) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
goto out;
|
|
}
|
|
#endif
|
|
if (fp2 != fp) {
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
mtx_lock(&mq->mq_mutex);
|
|
FILEDESC_SUNLOCK(fdp);
|
|
if (sigev != NULL) {
|
|
if (mq->mq_notifier != NULL) {
|
|
error = EBUSY;
|
|
} else {
|
|
PROC_LOCK(p);
|
|
nt = notifier_search(p, mqd);
|
|
if (nt == NULL) {
|
|
if (newnt == NULL) {
|
|
PROC_UNLOCK(p);
|
|
mtx_unlock(&mq->mq_mutex);
|
|
newnt = notifier_alloc();
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
if (nt != NULL) {
|
|
sigqueue_take(&nt->nt_ksi);
|
|
if (newnt != NULL) {
|
|
notifier_free(newnt);
|
|
newnt = NULL;
|
|
}
|
|
} else {
|
|
nt = newnt;
|
|
newnt = NULL;
|
|
ksiginfo_init(&nt->nt_ksi);
|
|
nt->nt_ksi.ksi_flags |= KSI_INS | KSI_EXT;
|
|
nt->nt_ksi.ksi_code = SI_MESGQ;
|
|
nt->nt_proc = p;
|
|
nt->nt_ksi.ksi_mqd = mqd;
|
|
notifier_insert(p, nt);
|
|
}
|
|
nt->nt_sigev = *sigev;
|
|
mq->mq_notifier = nt;
|
|
PROC_UNLOCK(p);
|
|
/*
|
|
* if there is no receivers and message queue
|
|
* is not empty, we should send notification
|
|
* as soon as possible.
|
|
*/
|
|
if (mq->mq_receivers == 0 &&
|
|
!TAILQ_EMPTY(&mq->mq_msgq))
|
|
mqueue_send_notification(mq);
|
|
}
|
|
} else {
|
|
notifier_remove(p, mq, mqd);
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
|
|
out:
|
|
fdrop(fp, td);
|
|
if (newnt != NULL)
|
|
notifier_free(newnt);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
sys_kmq_notify(struct thread *td, struct kmq_notify_args *uap)
|
|
{
|
|
struct sigevent ev, *evp;
|
|
int error;
|
|
|
|
if (uap->sigev == NULL) {
|
|
evp = NULL;
|
|
} else {
|
|
error = copyin(uap->sigev, &ev, sizeof(ev));
|
|
if (error != 0)
|
|
return (error);
|
|
evp = &ev;
|
|
}
|
|
return (kern_kmq_notify(td, uap->mqd, evp));
|
|
}
|
|
|
|
static void
|
|
mqueue_fdclose(struct thread *td, int fd, struct file *fp)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct mqueue *mq;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
FILEDESC_LOCK_ASSERT(fdp);
|
|
|
|
if (fp->f_ops == &mqueueops) {
|
|
mq = FPTOMQ(fp);
|
|
mtx_lock(&mq->mq_mutex);
|
|
notifier_remove(td->td_proc, mq, fd);
|
|
|
|
/* have to wakeup thread in same process */
|
|
if (mq->mq_flags & MQ_RSEL) {
|
|
mq->mq_flags &= ~MQ_RSEL;
|
|
selwakeup(&mq->mq_rsel);
|
|
}
|
|
if (mq->mq_flags & MQ_WSEL) {
|
|
mq->mq_flags &= ~MQ_WSEL;
|
|
selwakeup(&mq->mq_wsel);
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
}
|
|
}
|
|
|
|
static void
|
|
mq_proc_exit(void *arg __unused, struct proc *p)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct mqueue *mq;
|
|
int i;
|
|
|
|
fdp = p->p_fd;
|
|
FILEDESC_SLOCK(fdp);
|
|
for (i = 0; i < fdp->fd_nfiles; ++i) {
|
|
fp = fget_locked(fdp, i);
|
|
if (fp != NULL && fp->f_ops == &mqueueops) {
|
|
mq = FPTOMQ(fp);
|
|
mtx_lock(&mq->mq_mutex);
|
|
notifier_remove(p, FPTOMQ(fp), i);
|
|
mtx_unlock(&mq->mq_mutex);
|
|
}
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
KASSERT(LIST_EMPTY(&p->p_mqnotifier), ("mq notifiers left"));
|
|
}
|
|
|
|
static int
|
|
mqf_poll(struct file *fp, int events, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(fp);
|
|
int revents = 0;
|
|
|
|
mtx_lock(&mq->mq_mutex);
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (mq->mq_curmsgs) {
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
} else {
|
|
mq->mq_flags |= MQ_RSEL;
|
|
selrecord(td, &mq->mq_rsel);
|
|
}
|
|
}
|
|
if (events & POLLOUT) {
|
|
if (mq->mq_curmsgs < mq->mq_maxmsg)
|
|
revents |= POLLOUT;
|
|
else {
|
|
mq->mq_flags |= MQ_WSEL;
|
|
selrecord(td, &mq->mq_wsel);
|
|
}
|
|
}
|
|
mtx_unlock(&mq->mq_mutex);
|
|
return (revents);
|
|
}
|
|
|
|
static int
|
|
mqf_close(struct file *fp, struct thread *td)
|
|
{
|
|
struct mqfs_node *pn;
|
|
|
|
fp->f_ops = &badfileops;
|
|
pn = fp->f_data;
|
|
fp->f_data = NULL;
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
mqnode_release(pn);
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mqf_stat(struct file *fp, struct stat *st, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct mqfs_node *pn = fp->f_data;
|
|
|
|
bzero(st, sizeof *st);
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
st->st_atim = pn->mn_atime;
|
|
st->st_mtim = pn->mn_mtime;
|
|
st->st_ctim = pn->mn_ctime;
|
|
st->st_birthtim = pn->mn_birth;
|
|
st->st_uid = pn->mn_uid;
|
|
st->st_gid = pn->mn_gid;
|
|
st->st_mode = S_IFIFO | pn->mn_mode;
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mqf_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
error = 0;
|
|
pn = fp->f_data;
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
error = vaccess(VREG, pn->mn_mode, pn->mn_uid, pn->mn_gid, VADMIN,
|
|
active_cred, NULL);
|
|
if (error != 0)
|
|
goto out;
|
|
pn->mn_mode = mode & ACCESSPERMS;
|
|
out:
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mqf_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
struct mqfs_node *pn;
|
|
int error;
|
|
|
|
error = 0;
|
|
pn = fp->f_data;
|
|
sx_xlock(&mqfs_data.mi_lock);
|
|
if (uid == (uid_t)-1)
|
|
uid = pn->mn_uid;
|
|
if (gid == (gid_t)-1)
|
|
gid = pn->mn_gid;
|
|
if (((uid != pn->mn_uid && uid != active_cred->cr_uid) ||
|
|
(gid != pn->mn_gid && !groupmember(gid, active_cred))) &&
|
|
(error = priv_check_cred(active_cred, PRIV_VFS_CHOWN, 0)))
|
|
goto out;
|
|
pn->mn_uid = uid;
|
|
pn->mn_gid = gid;
|
|
out:
|
|
sx_xunlock(&mqfs_data.mi_lock);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mqf_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(fp);
|
|
int error = 0;
|
|
|
|
if (kn->kn_filter == EVFILT_READ) {
|
|
kn->kn_fop = &mq_rfiltops;
|
|
knlist_add(&mq->mq_rsel.si_note, kn, 0);
|
|
} else if (kn->kn_filter == EVFILT_WRITE) {
|
|
kn->kn_fop = &mq_wfiltops;
|
|
knlist_add(&mq->mq_wsel.si_note, kn, 0);
|
|
} else
|
|
error = EINVAL;
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
filt_mqdetach(struct knote *kn)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(kn->kn_fp);
|
|
|
|
if (kn->kn_filter == EVFILT_READ)
|
|
knlist_remove(&mq->mq_rsel.si_note, kn, 0);
|
|
else if (kn->kn_filter == EVFILT_WRITE)
|
|
knlist_remove(&mq->mq_wsel.si_note, kn, 0);
|
|
else
|
|
panic("filt_mqdetach");
|
|
}
|
|
|
|
static int
|
|
filt_mqread(struct knote *kn, long hint)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(kn->kn_fp);
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
return (mq->mq_curmsgs != 0);
|
|
}
|
|
|
|
static int
|
|
filt_mqwrite(struct knote *kn, long hint)
|
|
{
|
|
struct mqueue *mq = FPTOMQ(kn->kn_fp);
|
|
|
|
mtx_assert(&mq->mq_mutex, MA_OWNED);
|
|
return (mq->mq_curmsgs < mq->mq_maxmsg);
|
|
}
|
|
|
|
static int
|
|
mqf_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
|
|
{
|
|
|
|
kif->kf_type = KF_TYPE_MQUEUE;
|
|
return (0);
|
|
}
|
|
|
|
static struct fileops mqueueops = {
|
|
.fo_read = invfo_rdwr,
|
|
.fo_write = invfo_rdwr,
|
|
.fo_truncate = invfo_truncate,
|
|
.fo_ioctl = invfo_ioctl,
|
|
.fo_poll = mqf_poll,
|
|
.fo_kqfilter = mqf_kqfilter,
|
|
.fo_stat = mqf_stat,
|
|
.fo_close = mqf_close,
|
|
.fo_chmod = mqf_chmod,
|
|
.fo_chown = mqf_chown,
|
|
.fo_sendfile = invfo_sendfile,
|
|
.fo_fill_kinfo = mqf_fill_kinfo,
|
|
};
|
|
|
|
static struct vop_vector mqfs_vnodeops = {
|
|
.vop_default = &default_vnodeops,
|
|
.vop_access = mqfs_access,
|
|
.vop_cachedlookup = mqfs_lookup,
|
|
.vop_lookup = vfs_cache_lookup,
|
|
.vop_reclaim = mqfs_reclaim,
|
|
.vop_create = mqfs_create,
|
|
.vop_remove = mqfs_remove,
|
|
.vop_inactive = mqfs_inactive,
|
|
.vop_open = mqfs_open,
|
|
.vop_close = mqfs_close,
|
|
.vop_getattr = mqfs_getattr,
|
|
.vop_setattr = mqfs_setattr,
|
|
.vop_read = mqfs_read,
|
|
.vop_write = VOP_EOPNOTSUPP,
|
|
.vop_readdir = mqfs_readdir,
|
|
.vop_mkdir = VOP_EOPNOTSUPP,
|
|
.vop_rmdir = VOP_EOPNOTSUPP
|
|
};
|
|
|
|
static struct vfsops mqfs_vfsops = {
|
|
.vfs_init = mqfs_init,
|
|
.vfs_uninit = mqfs_uninit,
|
|
.vfs_mount = mqfs_mount,
|
|
.vfs_unmount = mqfs_unmount,
|
|
.vfs_root = mqfs_root,
|
|
.vfs_statfs = mqfs_statfs,
|
|
};
|
|
|
|
static struct vfsconf mqueuefs_vfsconf = {
|
|
.vfc_version = VFS_VERSION,
|
|
.vfc_name = "mqueuefs",
|
|
.vfc_vfsops = &mqfs_vfsops,
|
|
.vfc_typenum = -1,
|
|
.vfc_flags = VFCF_SYNTHETIC
|
|
};
|
|
|
|
static struct syscall_helper_data mq_syscalls[] = {
|
|
SYSCALL_INIT_HELPER(kmq_open),
|
|
SYSCALL_INIT_HELPER(kmq_setattr),
|
|
SYSCALL_INIT_HELPER(kmq_timedsend),
|
|
SYSCALL_INIT_HELPER(kmq_timedreceive),
|
|
SYSCALL_INIT_HELPER(kmq_notify),
|
|
SYSCALL_INIT_HELPER(kmq_unlink),
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
#include <compat/freebsd32/freebsd32.h>
|
|
#include <compat/freebsd32/freebsd32_proto.h>
|
|
#include <compat/freebsd32/freebsd32_signal.h>
|
|
#include <compat/freebsd32/freebsd32_syscall.h>
|
|
#include <compat/freebsd32/freebsd32_util.h>
|
|
|
|
static void
|
|
mq_attr_from32(const struct mq_attr32 *from, struct mq_attr *to)
|
|
{
|
|
|
|
to->mq_flags = from->mq_flags;
|
|
to->mq_maxmsg = from->mq_maxmsg;
|
|
to->mq_msgsize = from->mq_msgsize;
|
|
to->mq_curmsgs = from->mq_curmsgs;
|
|
}
|
|
|
|
static void
|
|
mq_attr_to32(const struct mq_attr *from, struct mq_attr32 *to)
|
|
{
|
|
|
|
to->mq_flags = from->mq_flags;
|
|
to->mq_maxmsg = from->mq_maxmsg;
|
|
to->mq_msgsize = from->mq_msgsize;
|
|
to->mq_curmsgs = from->mq_curmsgs;
|
|
}
|
|
|
|
int
|
|
freebsd32_kmq_open(struct thread *td, struct freebsd32_kmq_open_args *uap)
|
|
{
|
|
struct mq_attr attr;
|
|
struct mq_attr32 attr32;
|
|
int flags, error;
|
|
|
|
if ((uap->flags & O_ACCMODE) == O_ACCMODE || uap->flags & O_EXEC)
|
|
return (EINVAL);
|
|
flags = FFLAGS(uap->flags);
|
|
if ((flags & O_CREAT) != 0 && uap->attr != NULL) {
|
|
error = copyin(uap->attr, &attr32, sizeof(attr32));
|
|
if (error)
|
|
return (error);
|
|
mq_attr_from32(&attr32, &attr);
|
|
}
|
|
return (kern_kmq_open(td, uap->path, flags, uap->mode,
|
|
uap->attr != NULL ? &attr : NULL));
|
|
}
|
|
|
|
int
|
|
freebsd32_kmq_setattr(struct thread *td, struct freebsd32_kmq_setattr_args *uap)
|
|
{
|
|
struct mq_attr attr, oattr;
|
|
struct mq_attr32 attr32, oattr32;
|
|
int error;
|
|
|
|
if (uap->attr != NULL) {
|
|
error = copyin(uap->attr, &attr32, sizeof(attr32));
|
|
if (error != 0)
|
|
return (error);
|
|
mq_attr_from32(&attr32, &attr);
|
|
}
|
|
error = kern_kmq_setattr(td, uap->mqd, uap->attr != NULL ? &attr : NULL,
|
|
&oattr);
|
|
if (error == 0 && uap->oattr != NULL) {
|
|
mq_attr_to32(&oattr, &oattr32);
|
|
bzero(oattr32.__reserved, sizeof(oattr32.__reserved));
|
|
error = copyout(&oattr32, uap->oattr, sizeof(oattr32));
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
freebsd32_kmq_timedsend(struct thread *td,
|
|
struct freebsd32_kmq_timedsend_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
struct timespec32 ets32;
|
|
struct timespec *abs_timeout, ets;
|
|
int error;
|
|
int waitok;
|
|
|
|
AUDIT_ARG_FD(uap->mqd);
|
|
error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
if (uap->abs_timeout != NULL) {
|
|
error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
|
|
if (error != 0)
|
|
return (error);
|
|
CP(ets32, ets, tv_sec);
|
|
CP(ets32, ets, tv_nsec);
|
|
abs_timeout = &ets;
|
|
} else
|
|
abs_timeout = NULL;
|
|
waitok = !(fp->f_flag & O_NONBLOCK);
|
|
error = mqueue_send(mq, uap->msg_ptr, uap->msg_len,
|
|
uap->msg_prio, waitok, abs_timeout);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
freebsd32_kmq_timedreceive(struct thread *td,
|
|
struct freebsd32_kmq_timedreceive_args *uap)
|
|
{
|
|
struct mqueue *mq;
|
|
struct file *fp;
|
|
struct timespec32 ets32;
|
|
struct timespec *abs_timeout, ets;
|
|
int error, waitok;
|
|
|
|
AUDIT_ARG_FD(uap->mqd);
|
|
error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
|
|
if (error)
|
|
return (error);
|
|
if (uap->abs_timeout != NULL) {
|
|
error = copyin(uap->abs_timeout, &ets32, sizeof(ets32));
|
|
if (error != 0)
|
|
return (error);
|
|
CP(ets32, ets, tv_sec);
|
|
CP(ets32, ets, tv_nsec);
|
|
abs_timeout = &ets;
|
|
} else
|
|
abs_timeout = NULL;
|
|
waitok = !(fp->f_flag & O_NONBLOCK);
|
|
error = mqueue_receive(mq, uap->msg_ptr, uap->msg_len,
|
|
uap->msg_prio, waitok, abs_timeout);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
freebsd32_kmq_notify(struct thread *td, struct freebsd32_kmq_notify_args *uap)
|
|
{
|
|
struct sigevent ev, *evp;
|
|
struct sigevent32 ev32;
|
|
int error;
|
|
|
|
if (uap->sigev == NULL) {
|
|
evp = NULL;
|
|
} else {
|
|
error = copyin(uap->sigev, &ev32, sizeof(ev32));
|
|
if (error != 0)
|
|
return (error);
|
|
error = convert_sigevent32(&ev32, &ev);
|
|
if (error != 0)
|
|
return (error);
|
|
evp = &ev;
|
|
}
|
|
return (kern_kmq_notify(td, uap->mqd, evp));
|
|
}
|
|
|
|
static struct syscall_helper_data mq32_syscalls[] = {
|
|
SYSCALL32_INIT_HELPER(freebsd32_kmq_open),
|
|
SYSCALL32_INIT_HELPER(freebsd32_kmq_setattr),
|
|
SYSCALL32_INIT_HELPER(freebsd32_kmq_timedsend),
|
|
SYSCALL32_INIT_HELPER(freebsd32_kmq_timedreceive),
|
|
SYSCALL32_INIT_HELPER(freebsd32_kmq_notify),
|
|
SYSCALL32_INIT_HELPER_COMPAT(kmq_unlink),
|
|
SYSCALL_INIT_LAST
|
|
};
|
|
#endif
|
|
|
|
static int
|
|
mqinit(void)
|
|
{
|
|
int error;
|
|
|
|
error = syscall_helper_register(mq_syscalls, SY_THR_STATIC_KLD);
|
|
if (error != 0)
|
|
return (error);
|
|
#ifdef COMPAT_FREEBSD32
|
|
error = syscall32_helper_register(mq32_syscalls, SY_THR_STATIC_KLD);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mqunload(void)
|
|
{
|
|
|
|
#ifdef COMPAT_FREEBSD32
|
|
syscall32_helper_unregister(mq32_syscalls);
|
|
#endif
|
|
syscall_helper_unregister(mq_syscalls);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mq_modload(struct module *module, int cmd, void *arg)
|
|
{
|
|
int error = 0;
|
|
|
|
error = vfs_modevent(module, cmd, arg);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
switch (cmd) {
|
|
case MOD_LOAD:
|
|
error = mqinit();
|
|
if (error != 0)
|
|
mqunload();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
error = mqunload();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static moduledata_t mqueuefs_mod = {
|
|
"mqueuefs",
|
|
mq_modload,
|
|
&mqueuefs_vfsconf
|
|
};
|
|
DECLARE_MODULE(mqueuefs, mqueuefs_mod, SI_SUB_VFS, SI_ORDER_MIDDLE);
|
|
MODULE_VERSION(mqueuefs, 1);
|