#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file_internal.h>
#include <sys/stat.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/mount_internal.h>
#include <sys/namei.h>
#include <sys/vnode_internal.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/ubc.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/fsevents.h>
#include <sys/kdebug.h>
#include <sys/xattr.h>
#include <sys/ubc_internal.h>
#include <sys/uio_internal.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <miscfs/specfs/specdev.h>
static int vn_closefile(struct fileglob *fp, struct proc *p);
static int vn_ioctl(struct fileproc *fp, u_long com, caddr_t data, struct proc *p);
static int vn_read(struct fileproc *fp, struct uio *uio,
kauth_cred_t cred, int flags, struct proc *p);
static int vn_write(struct fileproc *fp, struct uio *uio,
kauth_cred_t cred, int flags, struct proc *p);
static int vn_select( struct fileproc *fp, int which, void * wql, struct proc *p);
static int vn_kqfilt_add(struct fileproc *fp, struct knote *kn, struct proc *p);
#if 0
static int vn_kqfilt_remove(struct vnode *vp, uintptr_t ident, struct proc *p);
#endif
struct fileops vnops =
{ vn_read, vn_write, vn_ioctl, vn_select, vn_closefile, vn_kqfilt_add, 0 };
int
vn_open(struct nameidata *ndp, int fmode, int cmode)
{
return(vn_open_modflags(ndp, &fmode, cmode));
}
int
vn_open_modflags(struct nameidata *ndp, int *fmodep, int cmode)
{
struct vnode_attr va;
VATTR_INIT(&va);
VATTR_SET(&va, va_mode, cmode);
return(vn_open_auth(ndp, fmodep, &va));
}
int
vn_open_auth(struct nameidata *ndp, int *fmodep, struct vnode_attr *vap)
{
struct vnode *vp;
struct vnode *dvp;
vfs_context_t ctx = ndp->ni_cnd.cn_context;
int error;
int fmode;
kauth_action_t action;
again:
vp = NULL;
dvp = NULL;
fmode = *fmodep;
if (fmode & O_CREAT) {
ndp->ni_cnd.cn_nameiop = CREATE;
ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | AUDITVNPATH1;
if ((fmode & O_EXCL) == 0)
ndp->ni_cnd.cn_flags |= FOLLOW;
if ( (error = namei(ndp)) )
goto out;
dvp = ndp->ni_dvp;
vp = ndp->ni_vp;
if (vp == NULL) {
if (vap == NULL) {
error = EINVAL;
goto badcreate;
}
if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0)
goto badcreate;
VATTR_SET(vap, va_type, VREG);
if (fmode & O_EXCL)
vap->va_vaflags |= VA_EXCLUSIVE;
if ((error = vn_create(dvp, &ndp->ni_vp, &ndp->ni_cnd, vap, 0, ctx)) != 0)
goto badcreate;
vp = ndp->ni_vp;
if (vp) {
int update_flags = 0;
if (vp->v_name == NULL)
update_flags |= VNODE_UPDATE_NAME;
if (vp->v_parent == NULLVP)
update_flags |= VNODE_UPDATE_PARENT;
if (update_flags)
vnode_update_identity(vp, dvp, ndp->ni_cnd.cn_nameptr, ndp->ni_cnd.cn_namelen, ndp->ni_cnd.cn_hash, update_flags);
if (need_fsevent(FSE_CREATE_FILE, vp)) {
add_fsevent(FSE_CREATE_FILE, ctx,
FSE_ARG_VNODE, vp,
FSE_ARG_DONE);
}
}
badcreate:
nameidone(ndp);
ndp->ni_dvp = NULL;
vnode_put(dvp);
if (error) {
if ((error == EEXIST) && !(fmode & O_EXCL)) {
goto again;
}
goto bad;
}
fmode &= ~O_TRUNC;
} else {
nameidone(ndp);
ndp->ni_dvp = NULL;
vnode_put(dvp);
if (fmode & O_EXCL) {
error = EEXIST;
goto bad;
}
fmode &= ~O_CREAT;
}
} else {
ndp->ni_cnd.cn_nameiop = LOOKUP;
ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | AUDITVNPATH1;
if ( (error = namei(ndp)) )
goto out;
vp = ndp->ni_vp;
nameidone(ndp);
ndp->ni_dvp = NULL;
}
if (vp->v_type == VSOCK && vp->v_tag != VT_FDESC) {
error = EOPNOTSUPP;
goto bad;
}
#if DIAGNOSTIC
if (UBCINFOMISSING(vp))
panic("vn_open: ubc_info_init");
#endif
if ((fmode & O_CREAT) == 0) {
if (vnode_isdir(vp) && (fmode & (FWRITE | O_TRUNC))) {
error = EISDIR;
goto bad;
}
action = 0;
if (fmode & FREAD)
action |= KAUTH_VNODE_READ_DATA;
if (fmode & (FWRITE | O_TRUNC))
action |= KAUTH_VNODE_WRITE_DATA;
if ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)
goto bad;
}
if ( (error = VNOP_OPEN(vp, fmode, ctx)) ) {
goto bad;
}
if ( (error = vnode_ref_ext(vp, fmode)) )
goto bad;
kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_OPEN,
(uintptr_t)vp, 0);
*fmodep = fmode;
return (0);
bad:
ndp->ni_vp = NULL;
if (vp) {
vnode_put(vp);
if ((error == ENOENT) && (*fmodep & O_CREAT)) {
goto again;
}
}
out:
return (error);
}
#warning vn_access is deprecated
int
vn_access(vnode_t vp, int mode, vfs_context_t context)
{
kauth_action_t action;
action = 0;
if (mode & VREAD)
action |= KAUTH_VNODE_READ_DATA;
if (mode & VWRITE)
action |= KAUTH_VNODE_WRITE_DATA;
if (mode & VEXEC)
action |= KAUTH_VNODE_EXECUTE;
return(vnode_authorize(vp, NULL, action, context));
}
int
vn_close(struct vnode *vp, int flags, kauth_cred_t cred, struct proc *p)
{
struct vfs_context context;
int error;
context.vc_proc = p;
context.vc_ucred = cred;
if (flags & FWASWRITTEN) {
if (need_fsevent(FSE_CONTENT_MODIFIED, vp)) {
add_fsevent(FSE_CONTENT_MODIFIED, &context,
FSE_ARG_VNODE, vp,
FSE_ARG_DONE);
}
}
error = VNOP_CLOSE(vp, flags, &context);
(void)vnode_rele_ext(vp, flags, 0);
return (error);
}
static int
vn_read_swapfile(
struct vnode *vp,
uio_t uio)
{
static char *swap_read_zero_page = NULL;
int error;
off_t swap_count, this_count;
off_t file_end, read_end;
off_t prev_resid;
error = 0;
swap_count = uio_resid(uio);
file_end = ubc_getsize(vp);
read_end = uio->uio_offset + uio_resid(uio);
if (uio->uio_offset >= file_end) {
swap_count = 0;
} else if (read_end > file_end) {
swap_count -= (read_end - file_end);
}
while (swap_count > 0) {
if (swap_read_zero_page == NULL) {
char *my_zero_page;
int funnel_state;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
if (swap_read_zero_page == NULL) {
MALLOC(my_zero_page, char *, PAGE_SIZE,
M_TEMP, M_WAITOK);
memset(my_zero_page, '?', PAGE_SIZE);
my_zero_page[PAGE_SIZE-1] = '\n';
if (swap_read_zero_page == NULL) {
swap_read_zero_page = my_zero_page;
} else {
FREE(my_zero_page, M_TEMP);
}
} else {
}
thread_funnel_set(kernel_flock, funnel_state);
}
this_count = swap_count;
if (this_count > PAGE_SIZE) {
this_count = PAGE_SIZE;
}
prev_resid = uio_resid(uio);
error = uiomove((caddr_t) swap_read_zero_page,
this_count,
uio);
if (error) {
break;
}
swap_count -= (prev_resid - uio_resid(uio));
}
return error;
}
int
vn_rdwr(
enum uio_rw rw,
struct vnode *vp,
caddr_t base,
int len,
off_t offset,
enum uio_seg segflg,
int ioflg,
kauth_cred_t cred,
int *aresid,
struct proc *p)
{
return vn_rdwr_64(rw,
vp,
(uint64_t)(uintptr_t)base,
(int64_t)len,
offset,
segflg,
ioflg,
cred,
aresid,
p);
}
int
vn_rdwr_64(
enum uio_rw rw,
struct vnode *vp,
uint64_t base,
int64_t len,
off_t offset,
enum uio_seg segflg,
int ioflg,
kauth_cred_t cred,
int *aresid,
struct proc *p)
{
uio_t auio;
int spacetype;
struct vfs_context context;
int error=0;
char uio_buf[ UIO_SIZEOF(1) ];
context.vc_proc = p;
context.vc_ucred = cred;
if (UIO_SEG_IS_USER_SPACE(segflg)) {
spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
}
else {
spacetype = UIO_SYSSPACE;
}
auio = uio_createwithbuffer(1, offset, spacetype, rw,
&uio_buf[0], sizeof(uio_buf));
uio_addiov(auio, base, len);
if (rw == UIO_READ) {
if (vp->v_flag & VSWAP) {
error = vn_read_swapfile(vp, auio);
} else {
error = VNOP_READ(vp, auio, ioflg, &context);
}
} else {
error = VNOP_WRITE(vp, auio, ioflg, &context);
}
if (aresid)
*aresid = uio_resid(auio);
else
if (uio_resid(auio) && error == 0)
error = EIO;
return (error);
}
static int
vn_read(struct fileproc *fp, struct uio *uio, kauth_cred_t cred,
int flags, struct proc *p)
{
struct vnode *vp;
int error, ioflag;
off_t count;
struct vfs_context context;
context.vc_proc = p;
context.vc_ucred = cred;
vp = (struct vnode *)fp->f_fglob->fg_data;
if ( (error = vnode_getwithref(vp)) ) {
return(error);
}
ioflag = 0;
if (fp->f_fglob->fg_flag & FNONBLOCK)
ioflag |= IO_NDELAY;
if ((flags & FOF_OFFSET) == 0)
uio->uio_offset = fp->f_fglob->fg_offset;
count = uio_resid(uio);
if (vp->v_flag & VSWAP) {
error = vn_read_swapfile(vp, uio);
} else {
error = VNOP_READ(vp, uio, ioflag, &context);
}
if ((flags & FOF_OFFSET) == 0)
fp->f_fglob->fg_offset += count - uio_resid(uio);
(void)vnode_put(vp);
return (error);
}
static int
vn_write(struct fileproc *fp, struct uio *uio, kauth_cred_t cred,
int flags, struct proc *p)
{
struct vnode *vp;
int error, ioflag;
off_t count;
struct vfs_context context;
context.vc_proc = p;
context.vc_ucred = cred;
count = 0;
vp = (struct vnode *)fp->f_fglob->fg_data;
if ( (error = vnode_getwithref(vp)) ) {
return(error);
}
ioflag = IO_UNIT;
if (vp->v_type == VREG && (fp->f_fglob->fg_flag & O_APPEND))
ioflag |= IO_APPEND;
if (fp->f_fglob->fg_flag & FNONBLOCK)
ioflag |= IO_NDELAY;
if ((fp->f_fglob->fg_flag & O_FSYNC) ||
(vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
ioflag |= IO_SYNC;
if ((flags & FOF_OFFSET) == 0) {
uio->uio_offset = fp->f_fglob->fg_offset;
count = uio_resid(uio);
}
if (p && (vp->v_type == VREG) &&
(((uio->uio_offset + uio_uio_resid(uio)) > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) ||
(uio_uio_resid(uio) > (p->p_rlimit[RLIMIT_FSIZE].rlim_cur - uio->uio_offset)))) {
psignal(p, SIGXFSZ);
vnode_put(vp);
return (EFBIG);
}
error = VNOP_WRITE(vp, uio, ioflag, &context);
if ((flags & FOF_OFFSET) == 0) {
if (ioflag & IO_APPEND)
fp->f_fglob->fg_offset = uio->uio_offset;
else
fp->f_fglob->fg_offset += count - uio_resid(uio);
}
if ((error == 0) && (vp->v_tag == VT_NFS) && (UBCINFOEXISTS(vp))) {
ubc_setcred(vp, p);
}
(void)vnode_put(vp);
return (error);
}
int
vn_stat_noauth(struct vnode *vp, struct stat *sb, kauth_filesec_t *xsec, vfs_context_t ctx)
{
struct vnode_attr va;
int error;
u_short mode;
kauth_filesec_t fsec;
VATTR_INIT(&va);
VATTR_WANTED(&va, va_fsid);
VATTR_WANTED(&va, va_fileid);
VATTR_WANTED(&va, va_mode);
VATTR_WANTED(&va, va_type);
VATTR_WANTED(&va, va_nlink);
VATTR_WANTED(&va, va_uid);
VATTR_WANTED(&va, va_gid);
VATTR_WANTED(&va, va_rdev);
VATTR_WANTED(&va, va_data_size);
VATTR_WANTED(&va, va_access_time);
VATTR_WANTED(&va, va_modify_time);
VATTR_WANTED(&va, va_change_time);
VATTR_WANTED(&va, va_flags);
VATTR_WANTED(&va, va_gen);
VATTR_WANTED(&va, va_iosize);
VATTR_WANTED(&va, va_total_alloc);
if (xsec != NULL) {
VATTR_WANTED(&va, va_uuuid);
VATTR_WANTED(&va, va_guuid);
VATTR_WANTED(&va, va_acl);
}
error = vnode_getattr(vp, &va, ctx);
if (error)
goto out;
sb->st_dev = va.va_fsid;
sb->st_ino = (ino_t)va.va_fileid;
mode = va.va_mode;
switch (vp->v_type) {
case VREG:
mode |= S_IFREG;
break;
case VDIR:
mode |= S_IFDIR;
break;
case VBLK:
mode |= S_IFBLK;
break;
case VCHR:
mode |= S_IFCHR;
break;
case VLNK:
mode |= S_IFLNK;
break;
case VSOCK:
mode |= S_IFSOCK;
break;
case VFIFO:
mode |= S_IFIFO;
break;
default:
error = EBADF;
goto out;
};
sb->st_mode = mode;
sb->st_nlink = VATTR_IS_SUPPORTED(&va, va_nlink) ? (u_int16_t)va.va_nlink : 1;
sb->st_uid = va.va_uid;
sb->st_gid = va.va_gid;
sb->st_rdev = va.va_rdev;
sb->st_size = va.va_data_size;
sb->st_atimespec = va.va_access_time;
sb->st_mtimespec = va.va_modify_time;
sb->st_ctimespec = va.va_change_time;
sb->st_blksize = va.va_iosize;
sb->st_flags = va.va_flags;
sb->st_blocks = roundup(va.va_total_alloc, 512) / 512;
if (xsec != NULL) {
if (!VATTR_IS_SUPPORTED(&va, va_acl) &&
!VATTR_IS_SUPPORTED(&va, va_uuuid) &&
!VATTR_IS_SUPPORTED(&va, va_guuid)) {
*xsec = KAUTH_FILESEC_NONE;
} else {
if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL)) {
fsec = kauth_filesec_alloc(va.va_acl->acl_entrycount);
} else {
fsec = kauth_filesec_alloc(0);
}
if (fsec == NULL) {
error = ENOMEM;
goto out;
}
fsec->fsec_magic = KAUTH_FILESEC_MAGIC;
if (VATTR_IS_SUPPORTED(&va, va_uuuid)) {
fsec->fsec_owner = va.va_uuuid;
} else {
fsec->fsec_owner = kauth_null_guid;
}
if (VATTR_IS_SUPPORTED(&va, va_guuid)) {
fsec->fsec_group = va.va_guuid;
} else {
fsec->fsec_group = kauth_null_guid;
}
if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL)) {
bcopy(va.va_acl, &(fsec->fsec_acl), KAUTH_ACL_COPYSIZE(va.va_acl));
} else {
fsec->fsec_acl.acl_entrycount = KAUTH_FILESEC_NOACL;
}
*xsec = fsec;
}
}
if (va.va_gen && !vfs_context_issuser(ctx))
sb->st_gen = 0;
else
sb->st_gen = va.va_gen;
error = 0;
out:
if (VATTR_IS_SUPPORTED(&va, va_acl) && va.va_acl != NULL)
kauth_acl_free(va.va_acl);
return (error);
}
int
vn_stat(struct vnode *vp, struct stat *sb, kauth_filesec_t *xsec, vfs_context_t ctx)
{
int error;
if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY, ctx)) != 0)
return(error);
return(vn_stat_noauth(vp, sb, xsec, ctx));
}
static int
vn_ioctl(fp, com, data, p)
struct fileproc *fp;
u_long com;
caddr_t data;
struct proc *p;
{
register struct vnode *vp = ((struct vnode *)fp->f_fglob->fg_data);
struct vfs_context context;
off_t file_size;
int error;
struct vnode *ttyvp;
int funnel_state;
if ( (error = vnode_getwithref(vp)) ) {
return(error);
}
context.vc_proc = p;
context.vc_ucred = p->p_ucred;
switch (vp->v_type) {
case VREG:
case VDIR:
if (com == FIONREAD) {
if ((error = vnode_size(vp, &file_size, &context)) != 0)
goto out;
*(int *)data = file_size - fp->f_fglob->fg_offset;
goto out;
}
if (com == FIONBIO || com == FIOASYNC) {
goto out;
}
default:
error = ENOTTY;
goto out;
case VFIFO:
case VCHR:
case VBLK:
if (com == DKIOCSETBLOCKSIZE) {
error = EPERM;
goto out;
}
if (com == FIODTYPE) {
if (vp->v_type == VBLK) {
if (major(vp->v_rdev) >= nblkdev) {
error = ENXIO;
goto out;
}
*(int *)data = bdevsw[major(vp->v_rdev)].d_type;
} else if (vp->v_type == VCHR) {
if (major(vp->v_rdev) >= nchrdev) {
error = ENXIO;
goto out;
}
*(int *)data = cdevsw[major(vp->v_rdev)].d_type;
} else {
error = ENOTTY;
goto out;
}
goto out;
}
error = VNOP_IOCTL(vp, com, data, fp->f_fglob->fg_flag, &context);
if (error == 0 && com == TIOCSCTTY) {
vnode_ref(vp);
funnel_state = thread_funnel_set(kernel_flock, TRUE);
ttyvp = p->p_session->s_ttyvp;
p->p_session->s_ttyvp = vp;
thread_funnel_set(kernel_flock, funnel_state);
if (ttyvp)
vnode_rele(ttyvp);
}
}
out:
(void)vnode_put(vp);
return(error);
}
static int
vn_select(fp, which, wql, p)
struct fileproc *fp;
int which;
void * wql;
struct proc *p;
{
int error;
struct vnode * vp = (struct vnode *)fp->f_fglob->fg_data;
struct vfs_context context;
if ( (error = vnode_getwithref(vp)) == 0 ) {
context.vc_proc = p;
context.vc_ucred = fp->f_fglob->fg_cred;
error = VNOP_SELECT(vp, which, fp->f_fglob->fg_flag, wql, &context);
(void)vnode_put(vp);
}
return(error);
}
int
vn_lock(__unused vnode_t vp, __unused int flags, __unused proc_t p)
{
return (0);
}
static int
vn_closefile(fg, p)
struct fileglob *fg;
struct proc *p;
{
struct vnode *vp = (struct vnode *)fg->fg_data;
int error;
if ( (error = vnode_getwithref(vp)) == 0 ) {
error = vn_close(vp, fg->fg_flag, fg->fg_cred, p);
(void)vnode_put(vp);
}
return(error);
}
int
vn_pathconf(vnode_t vp, int name, register_t *retval, vfs_context_t ctx)
{
int error = 0;
switch(name) {
case _PC_EXTENDED_SECURITY_NP:
*retval = vfs_extendedsecurity(vnode_mount(vp));
break;
case _PC_AUTH_OPAQUE_NP:
*retval = vfs_authopaque(vnode_mount(vp));
break;
default:
error = VNOP_PATHCONF(vp, name, retval, ctx);
break;
}
return (error);
}
static int
vn_kqfilt_add(fp, kn, p)
struct fileproc *fp;
struct knote *kn;
struct proc *p;
{
struct vnode *vp = (struct vnode *)fp->f_fglob->fg_data;
struct vfs_context context;
int error;
int funnel_state;
if ( (error = vnode_getwithref(vp)) == 0 ) {
context.vc_proc = p;
context.vc_ucred = p->p_ucred;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
error = VNOP_KQFILT_ADD(vp, kn, &context);
thread_funnel_set(kernel_flock, funnel_state);
(void)vnode_put(vp);
}
return (error);
}
#if 0
static int
vn_kqfilt_remove(vp, ident, p)
struct vnode *vp;
uintptr_t ident;
struct proc *p;
{
struct vfs_context context;
int error;
int funnel_state;
if ( (error = vnode_getwithref(vp)) == 0 ) {
context.vc_proc = p;
context.vc_ucred = p->p_ucred;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
error = VNOP_KQFILT_REMOVE(vp, ident, &context);
thread_funnel_set(kernel_flock, funnel_state);
(void)vnode_put(vp);
}
return (error);
}
#endif