/* $OpenBSD: portal_vnops.c,v 1.24 2007/06/18 08:30:07 jasper Exp $ */
/* $NetBSD: portal_vnops.c,v 1.17 1996/02/13 13:12:57 mycroft Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: Id: portal_vnops.c,v 1.4 1992/05/30 10:05:24 jsp Exp
* @(#)portal_vnops.c 8.8 (Berkeley) 1/21/94
*/
/*
* Portal Filesystem
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/mbuf.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/un.h>
#include <sys/unpcb.h>
#include <sys/syscallargs.h>
#include <miscfs/portal/portal.h>
static int portal_fileid = PORTAL_ROOTFILEID+1;
static void portal_closefd(struct proc *, int);
static int portal_connect(struct socket *, struct socket *);
int portal_badop(void *);
int portal_lookup(void *);
#define portal_create eopnotsupp
#define portal_mknod eopnotsupp
int portal_open(void *);
#define portal_close nullop
#define portal_access nullop
int portal_getattr(void *);
int portal_setattr(void *);
#define portal_read eopnotsupp
#define portal_write eopnotsupp
#define portal_ioctl (int (*)(void *))enoioctl
#define portal_fsync nullop
#define portal_remove eopnotsupp
int portal_link(void *);
#define portal_rename eopnotsupp
#define portal_mkdir eopnotsupp
#define portal_rmdir eopnotsupp
int portal_symlink(void *);
int portal_readdir(void *);
#define portal_revoke vop_generic_revoke
#define portal_readlink eopnotsupp
int portal_inactive(void *);
int portal_reclaim(void *);
#define portal_lock vop_generic_lock
#define portal_unlock vop_generic_unlock
#define portal_bmap portal_badop
#define portal_strategy portal_badop
int portal_print(void *);
#define portal_islocked vop_generic_islocked
int portal_pathconf(void *);
#define portal_advlock eopnotsupp
#define portal_bwrite eopnotsupp
int portal_poll(void *);
int (**portal_vnodeop_p)(void *);
struct vnodeopv_entry_desc portal_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, portal_lookup }, /* lookup */
{ &vop_create_desc, portal_create }, /* create */
{ &vop_mknod_desc, portal_mknod }, /* mknod */
{ &vop_open_desc, portal_open }, /* open */
{ &vop_close_desc, portal_close }, /* close */
{ &vop_access_desc, portal_access }, /* access */
{ &vop_getattr_desc, portal_getattr }, /* getattr */
{ &vop_setattr_desc, portal_setattr }, /* setattr */
{ &vop_read_desc, portal_read }, /* read */
{ &vop_write_desc, portal_write }, /* write */
{ &vop_ioctl_desc, portal_ioctl }, /* ioctl */
{ &vop_poll_desc, portal_poll }, /* poll */
{ &vop_revoke_desc, portal_revoke }, /* revoke */
{ &vop_fsync_desc, portal_fsync }, /* fsync */
{ &vop_remove_desc, portal_remove }, /* remove */
{ &vop_link_desc, portal_link }, /* link */
{ &vop_rename_desc, portal_rename }, /* rename */
{ &vop_mkdir_desc, portal_mkdir }, /* mkdir */
{ &vop_rmdir_desc, portal_rmdir }, /* rmdir */
{ &vop_symlink_desc, portal_symlink }, /* symlink */
{ &vop_readdir_desc, portal_readdir }, /* readdir */
{ &vop_readlink_desc, portal_readlink }, /* readlink */
{ &vop_abortop_desc, vop_generic_abortop }, /* abortop */
{ &vop_inactive_desc, portal_inactive }, /* inactive */
{ &vop_reclaim_desc, portal_reclaim }, /* reclaim */
{ &vop_lock_desc, portal_lock }, /* lock */
{ &vop_unlock_desc, portal_unlock }, /* unlock */
{ &vop_bmap_desc, portal_bmap }, /* bmap */
{ &vop_strategy_desc, portal_strategy }, /* strategy */
{ &vop_print_desc, portal_print }, /* print */
{ &vop_islocked_desc, portal_islocked }, /* islocked */
{ &vop_pathconf_desc, portal_pathconf }, /* pathconf */
{ &vop_advlock_desc, portal_advlock }, /* advlock */
{ &vop_bwrite_desc, portal_bwrite }, /* bwrite */
{ NULL, NULL }
};
struct vnodeopv_desc portal_vnodeop_opv_desc =
{ &portal_vnodeop_p, portal_vnodeop_entries };
static void
portal_closefd(struct proc *p, int fd)
{
struct sys_close_args /* {
syscallarg(int) fd;
} */ ua;
register_t retval[2];
int error;
SCARG(&ua, fd) = fd;
error = sys_close(p, &ua, retval);
/*
* We should never get an error, and there isn't anything
* we could do if we got one, so just print a message.
*/
if (error)
printf("portal_closefd: error = %d\n", error);
}
/*
* vp is the current namei directory
* cnp is the name to locate in that directory...
*/
int
portal_lookup(void *v)
{
struct vop_lookup_args *ap = v;
struct componentname *cnp = ap->a_cnp;
struct vnode **vpp = ap->a_vpp;
struct vnode *dvp = ap->a_dvp;
char *pname = cnp->cn_nameptr;
struct proc *p = cnp->cn_proc;
struct portalnode *pt;
int error;
struct vnode *fvp = 0;
char *path;
int size;
*vpp = NULLVP;
if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
return (EROFS);
if (cnp->cn_namelen == 1 && *pname == '.') {
*vpp = dvp;
VREF(dvp);
return (0);
}
error = getnewvnode(VT_PORTAL, dvp->v_mount, portal_vnodeop_p, &fvp);
if (error)
goto bad;
fvp->v_type = VREG;
MALLOC(fvp->v_data, void *, sizeof(struct portalnode), M_TEMP,
M_WAITOK);
pt = VTOPORTAL(fvp);
/*
* Save all of the remaining pathname and
* advance the namei next pointer to the end
* of the string.
*/
for (size = 0, path = pname; *path; path++)
size++;
cnp->cn_consume = size - cnp->cn_namelen;
pt->pt_arg = malloc(size+1, M_TEMP, M_WAITOK);
pt->pt_size = size+1;
bcopy(pname, pt->pt_arg, pt->pt_size);
pt->pt_fileid = portal_fileid++;
*vpp = fvp;
VOP_LOCK(fvp, LK_EXCLUSIVE, p);
/*
* As we are the last component of the path name, fix up
* the locking on the directory node.
*/
if ((cnp->cn_flags & LOCKPARENT) == 0) {
VOP_UNLOCK(dvp, 0, p);
cnp->cn_flags |= PDIRUNLOCK;
}
return (0);
bad:;
if (fvp)
vrele(fvp);
return (error);
}
static int
portal_connect(struct socket *so, struct socket *so2)
{
/* from unp_connect, bypassing the namei stuff... */
struct socket *so3;
struct unpcb *unp2;
struct unpcb *unp3;
if (so2 == 0)
return (ECONNREFUSED);
if (so->so_type != so2->so_type)
return (EPROTOTYPE);
if ((so2->so_options & SO_ACCEPTCONN) == 0)
return (ECONNREFUSED);
if ((so3 = sonewconn(so2, 0)) == 0)
return (ECONNREFUSED);
unp2 = sotounpcb(so2);
unp3 = sotounpcb(so3);
if (unp2->unp_addr)
unp3->unp_addr = m_copy(unp2->unp_addr, 0, (int)M_COPYALL);
so2 = so3;
return (unp_connect2(so, so2));
}
int
portal_open(void *v)
{
struct vop_open_args *ap = v;
struct socket *so = 0;
struct portalnode *pt;
struct proc *p = ap->a_p;
struct vnode *vp = ap->a_vp;
int s;
struct uio auio;
struct iovec aiov[2];
int res;
struct mbuf *cm = 0;
struct cmsghdr *cmsg;
int newfds;
int *ip;
int fd;
int error;
int len;
struct portalmount *fmp;
struct file *fp;
struct portal_cred pcred;
/*
* Nothing to do when opening the root node.
*/
if (vp->v_flag & VROOT)
return (0);
/*
* Can't be opened unless the caller is set up
* to deal with the side effects. Check for this
* by testing whether the p_dupfd has been set.
*/
if (p->p_dupfd >= 0)
return (ENODEV);
pt = VTOPORTAL(vp);
fmp = VFSTOPORTAL(vp->v_mount);
/*
* Create a new socket.
*/
error = socreate(AF_UNIX, &so, SOCK_STREAM, 0);
if (error)
goto bad;
/*
* Reserve some buffer space
*/
res = pt->pt_size + sizeof(pcred) + 512; /* XXX */
error = soreserve(so, res, res);
if (error)
goto bad;
/*
* Kick off connection
*/
s = splsoftnet();
error = portal_connect(so, (struct socket *)fmp->pm_server->f_data);
splx(s);
if (error)
goto bad;
/*
* Wait for connection to complete
*/
/*
* XXX: Since the mount point is holding a reference on the
* underlying server socket, it is not easy to find out whether
* the server process is still running. To handle this problem
* we loop waiting for the new socket to be connected (something
* which will only happen if the server is still running) or for
* the reference count on the server socket to drop to 1, which
* will happen if the server dies. Sleep for 5 second intervals
* and keep polling the reference count. XXX.
*/
s = splsoftnet();
while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
if (fmp->pm_server->f_count == 1) {
error = ECONNREFUSED;
splx(s);
goto bad;
}
(void) tsleep(&so->so_timeo, PSOCK, "portalcon", 5 * hz);
}
splx(s);
if (so->so_error) {
error = so->so_error;
goto bad;
}
/*
* Set miscellaneous flags
*/
so->so_rcv.sb_timeo = 0;
so->so_snd.sb_timeo = 0;
so->so_rcv.sb_flags |= SB_NOINTR;
so->so_snd.sb_flags |= SB_NOINTR;
pcred.pcr_flag = ap->a_mode;
pcred.pcr_uid = ap->a_cred->cr_uid;
pcred.pcr_gid = ap->a_cred->cr_gid;
pcred.pcr_ngroups = ap->a_cred->cr_ngroups;
bcopy(ap->a_cred->cr_groups, pcred.pcr_groups, NGROUPS * sizeof(gid_t));
aiov[0].iov_base = &pcred;
aiov[0].iov_len = sizeof(pcred);
aiov[1].iov_base = pt->pt_arg;
aiov[1].iov_len = pt->pt_size;
auio.uio_iov = aiov;
auio.uio_iovcnt = 2;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = p;
auio.uio_offset = 0;
auio.uio_resid = aiov[0].iov_len + aiov[1].iov_len;
error = sosend(so, (struct mbuf *) 0, &auio,
(struct mbuf *) 0, (struct mbuf *) 0, 0);
if (error)
goto bad;
len = auio.uio_resid = sizeof(int);
do {
struct mbuf *m = 0;
int flags = MSG_WAITALL;
fdpunlock(p->p_fd);
error = soreceive(so, (struct mbuf **) 0, &auio,
&m, &cm, &flags);
fdplock(p->p_fd);
if (error)
goto bad;
/*
* Grab an error code from the mbuf.
*/
if (m) {
m = m_pullup(m, sizeof(int)); /* Needed? */
if (m) {
error = *(mtod(m, int *));
m_freem(m);
} else {
error = EINVAL;
}
} else {
if (cm == 0) {
error = ECONNRESET; /* XXX */
#ifdef notdef
break;
#endif
}
}
} while (cm == 0 && auio.uio_resid == len && !error);
if (cm == 0)
goto bad;
if (auio.uio_resid) {
error = 0;
#ifdef notdef
error = EMSGSIZE;
goto bad;
#endif
}
/*
* XXX: Break apart the control message, and retrieve the
* received file descriptor. Note that more than one descriptor
* may have been received, or that the rights chain may have more
* than a single mbuf in it. What to do?
*/
cmsg = mtod(cm, struct cmsghdr *);
newfds = (cmsg->cmsg_len - sizeof(*cmsg)) / sizeof (int);
if (newfds == 0) {
error = ECONNREFUSED;
goto bad;
}
/*
* At this point the rights message consists of a control message
* header, followed by a data region containing a vector of
* integer file descriptors. The fds were allocated by the action
* of receiving the control message.
*/
ip = (int *)(cmsg + 1);
fd = *ip++;
if (newfds > 1) {
/*
* Close extra fds.
*/
int i;
printf("portal_open: %d extra fds\n", newfds - 1);
for (i = 1; i < newfds; i++) {
portal_closefd(p, *ip);
ip++;
}
}
/*
* Check that the mode the file is being opened for is a subset
* of the mode of the existing descriptor.
*/
if ((fp = fd_getfile(p->p_fd, fd)) == NULL) {
error = EBADF;
goto bad;
}
if (((ap->a_mode & (FREAD|FWRITE)) | fp->f_flag) != fp->f_flag) {
portal_closefd(p, fd);
error = EACCES;
goto bad;
}
/*
* Save the dup fd in the proc structure then return the
* special error code (ENXIO) which causes magic things to
* happen in vn_open. The whole concept is, well, hmmm.
*/
p->p_dupfd = fd;
error = ENXIO;
bad:;
/*
* And discard the control message.
*/
if (cm) {
m_freem(cm);
}
if (so) {
soshutdown(so, 2);
soclose(so);
}
return (error);
}
int
portal_getattr(void *v)
{
struct vop_getattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
bzero(vap, sizeof(*vap));
vattr_null(vap);
vap->va_uid = 0;
vap->va_gid = 0;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
vap->va_size = DEV_BSIZE;
vap->va_blocksize = DEV_BSIZE;
getnanotime(&vap->va_atime);
vap->va_mtime = vap->va_atime;
vap->va_ctime = vap->va_atime;
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_rdev = 0;
/* vap->va_qbytes = 0; */
vap->va_bytes = 0;
/* vap->va_qsize = 0; */
if (vp->v_flag & VROOT) {
vap->va_type = VDIR;
vap->va_mode = S_IRUSR|S_IWUSR|S_IXUSR|
S_IRGRP|S_IWGRP|S_IXGRP|
S_IROTH|S_IWOTH|S_IXOTH;
vap->va_nlink = 2;
vap->va_fileid = 2;
} else {
vap->va_type = VREG;
vap->va_mode = S_IRUSR|S_IWUSR|
S_IRGRP|S_IWGRP|
S_IROTH|S_IWOTH;
vap->va_nlink = 1;
vap->va_fileid = VTOPORTAL(vp)->pt_fileid;
}
return (0);
}
int
portal_setattr(void *v)
{
struct vop_setattr_args *ap = v;
/*
* Can't mess with the root vnode
*/
if (ap->a_vp->v_flag & VROOT)
return (EACCES);
if (ap->a_vap->va_flags != VNOVAL)
return (EOPNOTSUPP);
return (0);
}
/*
* Fake readdir, just return empty directory.
* It is hard to deal with '.' and '..' so don't bother.
*/
/*ARGSUSED*/
int
portal_readdir(void *v)
{
return (0);
}
/*ARGSUSED*/
int
portal_inactive(void *v)
{
struct vop_inactive_args *ap = v;
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
return (0);
}
int
portal_reclaim(void *v)
{
struct vop_reclaim_args *ap = v;
struct portalnode *pt = VTOPORTAL(ap->a_vp);
if (pt->pt_arg) {
free(pt->pt_arg, M_TEMP);
pt->pt_arg = 0;
}
FREE(ap->a_vp->v_data, M_TEMP);
ap->a_vp->v_data = 0;
return (0);
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
int
portal_pathconf(void *v)
{
struct vop_pathconf_args *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Print out the contents of a Portal vnode.
*/
/* ARGSUSED */
int
portal_print(void *v)
{
printf("tag VT_PORTAL, portal vnode\n");
return (0);
}
int
portal_link(void *v)
{
struct vop_link_args *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
vput(ap->a_dvp);
return (EROFS);
}
int
portal_symlink(void *v)
{
struct vop_symlink_args *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
vput(ap->a_dvp);
return (EROFS);
}
int
portal_badop(void *v)
{
panic ("portal: bad op");
return (0);
}
int
portal_poll(void *v)
{
struct vop_poll_args *ap = v;
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
}
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