/*
* Convert a user file descriptor to a kernel file entry. A reference on the
* file entry is held upon returning. This is lighter weight than
* fgetsock(), which bumps the socket reference drops the file reference
* count instead, as this approach avoids several additional mutex operations
* associated with the additional reference count.
*/
static int
getsock(struct filedesc *fdp, int fd, struct file **fpp)
{
struct file *fp;
int error;
fp = NULL;
if (fdp == NULL)
error = EBADF;
else {
FILEDESC_LOCK_FAST(fdp);
fp = fget_locked(fdp, fd);
if (fp == NULL)
error = EBADF;
else if (fp->f_type != DTYPE_SOCKET) {
fp = NULL;
error = ENOTSOCK;
} else {
fhold(fp);
error = 0;
}
FILEDESC_UNLOCK_FAST(fdp);
}
*fpp = fp;
return (error);
}
/*
* File descriptors can be passed into an AF_NETGRAPH socket.
* Note, that file descriptors cannot be passed OUT.
* Only character device descriptors are accepted.
* Character devices are useful to connect a graph to a device,
* which after all is the purpose of this whole system.
*/
static int
ng_internalize(struct mbuf *control, struct thread *td)
{
const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
struct file *fp;
struct vnode *vn;
int oldfds;
int fd;
if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
cm->cmsg_len != control->m_len) {
TRAP_ERROR;
return (EINVAL);
}
/* Check there is only one FD. XXX what would more than one signify? */
oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
if (oldfds != 1) {
TRAP_ERROR;
return (EINVAL);
}
/* Check that the FD given is legit. and change it to a pointer to a
* struct file. */
fd = CMSG_DATA(cm);
if ((error = fget(td, fd, &fp)) != 0)
return (error);
/* Depending on what kind of resource it is, act differently. For
* devices, we treat it as a file. For an AF_NETGRAPH socket,
* shortcut straight to the node. */
switch (fp->f_type) {
case DTYPE_VNODE:
vn = fp->f_data;
if (vn && (vn->v_type == VCHR)) {
/* for a VCHR, actually reference the FILE */
fhold(fp);
/* XXX then what :) */
/* how to pass on to other modules? */
} else {
fdrop(fp, td);
TRAP_ERROR;
return (EINVAL);
}
break;
default:
fdrop(fp, td);
TRAP_ERROR;
return (EINVAL);
}
fdrop(fp, td);
return (0);
}
/*
* Convert a file descriptor to appropriate smb_share pointer
*/
static struct file*
nsmb_getfp(struct filedesc* fdp, int fd, int flag)
{
struct file* fp;
FILEDESC_SLOCK(fdp);
if ((fp = fget_locked(fdp, fd)) == NULL || (fp->f_flag & flag) == 0) {
FILEDESC_SUNLOCK(fdp);
return (NULL);
}
fhold(fp);
FILEDESC_SUNLOCK(fdp);
return (fp);
}
/*
* Convert a file descriptor to appropriate smb_share pointer
*/
static struct file*
nsmb_getfp(struct filedesc* fdp, int fd, int flag)
{
struct file* fp;
FILEDESC_SLOCK(fdp);
if (fd < 0 || fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd]) == NULL ||
(fp->f_flag & flag) == 0) {
FILEDESC_SUNLOCK(fdp);
return (NULL);
}
fhold(fp);
FILEDESC_SUNLOCK(fdp);
return (fp);
}
static int
sysvipc_install_fd(struct proc *p_from, struct proc *p_to, int fd)
{
struct filedesc *fdp_from = p_from->p_fd;
struct filedesc *fdp_to = p_to->p_fd;
struct file *fp;
int error, newfd;
int flags;
/*
* Get the file corresponding to fd from the process p_from.
*/
spin_lock(&fdp_from->fd_spin);
if ((unsigned)fd >= fdp_from->fd_nfiles || fdp_from->fd_files[fd].fp == NULL) {
spin_unlock(&fdp_from->fd_spin);
return (EBADF);
}
fp = fdp_from->fd_files[fd].fp;
flags = fdp_from->fd_files[fd].fileflags;
fhold(fp); /* MPSAFE - can be called with a spinlock held */
spin_unlock(&fdp_from->fd_spin);
/*
* Reserve a fd in the process p_to.
*/
error = fdalloc(p_to, 1, &newfd);
if (error) {
fdrop(fp);
return (error);
}
/*
* Set fd for the fp file.
*/
fsetfd(fdp_to, fp, newfd);
fdp_to->fd_files[newfd].fileflags = flags;
fdrop(fp);
return (newfd);
}
static int
bsd_accept(cyg_file *fp, cyg_file *new_fp,
struct sockaddr *name, socklen_t *anamelen)
{
socklen_t namelen = 0;
int error = 0, s;
struct socket *head, *so;
struct sockaddr *sa;
if( anamelen != NULL)
namelen = *anamelen;
s = splsoftnet();
head = (struct socket *)fp->f_data;
if ((head->so_options & SO_ACCEPTCONN) == 0) {
splx(s);
return (EINVAL);
}
if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) {
splx(s);
return (EWOULDBLOCK);
}
while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) {
if (head->so_state & SS_CANTRCVMORE) {
head->so_error = ECONNABORTED;
break;
}
error = tsleep((caddr_t)&head->so_timeo, PSOCK | PCATCH,
"netcon", 0);
if (error) {
splx(s);
return (error);
}
}
if (head->so_error) {
error = head->so_error;
head->so_error = 0;
splx(s);
return (error);
}
/*
* At this point we know that there is at least one connection
* ready to be accepted. Remove it from the queue prior to
* allocating the file descriptor for it since falloc() may
* block allowing another process to accept the connection
* instead.
*/
so = TAILQ_FIRST(&head->so_comp);
TAILQ_REMOVE(&head->so_comp, so, so_list);
head->so_qlen--;
#if 0 // FIXME
fflag = lfp->f_flag;
error = falloc(p, &nfp, &fd);
if (error) {
/*
* Probably ran out of file descriptors. Put the
* unaccepted connection back onto the queue and
* do another wakeup so some other process might
* have a chance at it.
*/
TAILQ_INSERT_HEAD(&head->so_comp, so, so_list);
head->so_qlen++;
wakeup_one(&head->so_timeo);
splx(s);
goto done;
}
fhold(nfp);
p->p_retval[0] = fd;
/* connection has been removed from the listen queue */
KNOTE(&head->so_rcv.sb_sel.si_note, 0);
#endif
so->so_state &= ~SS_COMP;
so->so_head = NULL;
cyg_selinit(&so->so_rcv.sb_sel);
cyg_selinit(&so->so_snd.sb_sel);
new_fp->f_type = DTYPE_SOCKET;
new_fp->f_flag |= FREAD|FWRITE;
new_fp->f_offset = 0;
new_fp->f_ops = &bsd_sock_fileops;
new_fp->f_data = (CYG_ADDRWORD)so;
new_fp->f_xops = (CYG_ADDRWORD)&bsd_sockops;
sa = 0;
error = soaccept(so, &sa);
if (error) {
/*
* return a namelen of zero for older code which might
* ignore the return value from accept.
*/
if (name != NULL) {
*anamelen = 0;
}
goto noconnection;
}
if (sa == NULL) {
namelen = 0;
if (name)
goto gotnoname;
splx(s);
error = 0;
goto done;
}
if (name) {
if (namelen > sa->sa_len)
namelen = sa->sa_len;
#ifdef COMPAT_OLDSOCK
if (compat)
((struct osockaddr *)sa)->sa_family = sa->sa_family;
#endif
error = copyout(sa, (caddr_t)name, namelen);
if (!error)
gotnoname:
*anamelen = namelen;
}
noconnection:
#if 0 // FIXME
/*
* close the new descriptor, assuming someone hasn't ripped it
* out from under us.
*/
if (error) {
if (fdp->fd_ofiles[fd] == nfp) {
fdp->fd_ofiles[fd] = NULL;
fdrop(nfp, p);
}
}
splx(s);
/*
* Release explicitly held references before returning.
*/
done:
if (nfp != NULL)
fdrop(nfp, p);
fdrop(lfp, p);
return (error);
m_freem(nam);
#else
done:
#endif
splx(s);
return (error);
}
/*
* Mount the per-process file descriptors (/dev/fd)
*/
static int
portal_mount(struct mount *mp)
{
struct file *fp;
struct portalmount *fmp;
struct socket *so;
struct vnode *rvp;
struct thread *td;
struct portalnode *pn;
int error, v;
char *p;
td = curthread;
if (vfs_filteropt(mp->mnt_optnew, portal_opts))
return (EINVAL);
error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v);
if (error != 1)
return (EINVAL);
error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL);
if (error)
return (error);
/*
* Capsicum is not incompatible with portalfs, but we don't really
* know what rights are required. In the spirit of "better safe than
* sorry", pretend that all rights are required for now.
*/
if ((error = fget(td, v, CAP_MASK_VALID, &fp)) != 0)
return (error);
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
return(ENOTSOCK);
}
so = fp->f_data; /* XXX race against userland */
if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
fdrop(fp, td);
return (ESOCKTNOSUPPORT);
}
pn = malloc(sizeof(struct portalnode),
M_TEMP, M_WAITOK);
fmp = malloc(sizeof(struct portalmount),
M_PORTALFSMNT, M_WAITOK); /* XXX */
error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */
if (error) {
free(fmp, M_PORTALFSMNT);
free(pn, M_TEMP);
fdrop(fp, td);
return (error);
}
error = insmntque(rvp, mp); /* XXX: Too early for mpsafe fs */
if (error != 0) {
free(fmp, M_PORTALFSMNT);
free(pn, M_TEMP);
fdrop(fp, td);
return (error);
}
rvp->v_data = pn;
rvp->v_type = VDIR;
rvp->v_vflag |= VV_ROOT;
VTOPORTAL(rvp)->pt_arg = 0;
VTOPORTAL(rvp)->pt_size = 0;
VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
fmp->pm_root = rvp;
fhold(fp);
fmp->pm_server = fp;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
mp->mnt_data = fmp;
vfs_getnewfsid(mp);
vfs_mountedfrom(mp, p);
fdrop(fp, td);
return (0);
}
