/* $NetBSD: nfs_nfsdport.c,v 1.4 2021/03/29 02:13:38 simonb Exp $ */

/* $NetBSD: nfs_nfsdport.c,v 1.4 2021/03/29 02:13:38 simonb Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* 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.
* 4. 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.
*
*/

#include <sys/cdefs.h>
/* __FBSDID("FreeBSD: head/sys/fs/nfsserver/nfs_nfsdport.c 308212 2016-11-02 12:43:15Z kib "); */
__RCSID("$NetBSD: nfs_nfsdport.c,v 1.4 2021/03/29 02:13:38 simonb Exp $");

#if 0
#include <sys/capsicum.h>
#endif

/*
* Functions that perform the vfs operations required by the routines in
* nfsd_serv.c. It is hoped that this change will make the server more
* portable.
*/

#include <fs/nfs/common/nfsport.h>
#include <sys/hash.h>
#include <sys/sysctl.h>

#if 0
#include <nlm/nlm_prot.h>
#include <nlm/nlm.h>
#endif

FEATURE(nfsd, "NFSv4 server");

extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
extern int nfsrv_useacl;
extern int newnfs_numnfsd;
extern struct mount nfsv4root_mnt;
extern struct nfsrv_stablefirst nfsrv_stablefirst;
extern void (*nfsd_call_servertimer)(void);
extern SVCPOOL *nfsrvd_pool;
extern struct nfsv4lock nfsd_suspend_lock;
extern struct nfsclienthashhead *nfsclienthash;
extern struct nfslockhashhead *nfslockhash;
extern struct nfssessionhash *nfssessionhash;
extern int nfsrv_sessionhashsize;
extern struct nfsstatsv1 nfsstatsv1;
struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
NFSDLOCKMUTEX;
struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
struct mtx nfsrc_udpmtx;
struct mtx nfs_v4root_mutex;
struct nfsrvfh nfs_rootfh, nfs_pubfh;
int nfs_pubfhset = 0, nfs_rootfhset = 0;
struct proc *nfsd_master_proc = NULL;
int nfsd_debuglevel = 0;
static pid_t nfsd_master_pid = (pid_t)-1;
static char nfsd_master_comm[MAXCOMLEN + 1];
static struct timeval nfsd_master_start;
static uint32_t nfsv4_sysid = 0;

static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
struct ucred *);

int nfsrv_enable_crossmntpt = 1;
static int nfs_commit_blks;
static int nfs_commit_miss;
extern int nfsrv_issuedelegs;
extern int nfsrv_dolocallocks;
extern int nfsd_enable_stringtouid;

SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "NFS server");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
&nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
0, "");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
0, "");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
&nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
&nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
0, "Debug level for NFS server");
SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
&nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");

#define MAX_REORDERED_RPC 16
#define NUM_HEURISTIC 1031
#define NHUSE_INIT 64
#define NHUSE_INC 16
#define NHUSE_MAX 2048

static struct nfsheur {
struct vnode *nh_vp; /* vp to match (unreferenced pointer) */
off_t nh_nextoff; /* next offset for sequential detection */
int nh_use; /* use count for selection */
int nh_seqcount; /* heuristic */
} nfsheur[NUM_HEURISTIC];

/*
* Heuristic to detect sequential operation.
*/
static struct nfsheur *
nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
{
struct nfsheur *nh;
int hi, try;

/* Locate best candidate. */
try = 32;
hi = ((int)(vaddr_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
nh = &nfsheur[hi];
while (try--) {
if (nfsheur[hi].nh_vp == vp) {
nh = &nfsheur[hi];
break;
}
if (nfsheur[hi].nh_use > 0)
--nfsheur[hi].nh_use;
hi = (hi + 1) % NUM_HEURISTIC;
if (nfsheur[hi].nh_use < nh->nh_use)
nh = &nfsheur[hi];
}

/* Initialize hint if this is a new file. */
if (nh->nh_vp != vp) {
nh->nh_vp = vp;
nh->nh_nextoff = uio->uio_offset;
nh->nh_use = NHUSE_INIT;
if (uio->uio_offset == 0)
nh->nh_seqcount = 4;
else
nh->nh_seqcount = 1;
}

/* Calculate heuristic. */
if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
uio->uio_offset == nh->nh_nextoff) {
/* See comments in vfs_vnops.c:sequential_heuristic(). */
nh->nh_seqcount += howmany(uio->uio_resid, 16384);
if (nh->nh_seqcount > IO_SEQMAX)
nh->nh_seqcount = IO_SEQMAX;
} else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
/* Probably a reordered RPC, leave seqcount alone. */
} else if (nh->nh_seqcount > 1) {
nh->nh_seqcount /= 2;
} else {
nh->nh_seqcount = 0;
}
nh->nh_use += NHUSE_INC;
if (nh->nh_use > NHUSE_MAX)
nh->nh_use = NHUSE_MAX;
return (nh);
}

/*
* Get attributes into nfsvattr structure.
*/
int
nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
struct thread *p, int vpislocked)
{
int error, lockedit = 0;

if (vpislocked == 0) {
/*
* When vpislocked == 0, the vnode is either exclusively
* locked by this thread or not locked by this thread.
* As such, shared lock it, if not exclusively locked.
*/
if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
lockedit = 1;
NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
}
}
error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
if (lockedit != 0)
NFSVOPUNLOCK(vp, 0);

NFSEXITCODE(error);
return (error);
}

/*
* Get a file handle for a vnode.
*/
int
nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
{
int error;

NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
error = VOP_VPTOFH(vp, &fhp->fh_fid);

NFSEXITCODE(error);
return (error);
}

/*
* Perform access checking for vnodes obtained from file handles that would
* refer to files already opened by a Unix client. You cannot just use
* vn_writechk() and VOP_ACCESSX() for two reasons.
* 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
* case.
* 2 - The owner is to be given access irrespective of mode bits for some
* operations, so that processes that chmod after opening a file don't
* break.
*/
int
nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
u_int32_t *supportedtypep)
{
struct vattr vattr;
int error = 0, getret = 0;

if (vpislocked == 0) {
if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
error = EPERM;
goto out;
}
}
if (accmode & VWRITE) {
/* Just vn_writechk() changed to check rdonly */
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket or a block or character
* device resident on the file system.
*/
if (NFSVNO_EXRDONLY(exp) ||
(vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
error = EROFS;
default:
break;
}
}
/*
* If there's shared text associated with
* the inode, try to free it up once. If
* we fail, we can't allow writing.
*/
if (VOP_IS_TEXT(vp) && error == 0)
error = ETXTBSY;
}
if (error != 0) {
if (vpislocked == 0)
NFSVOPUNLOCK(vp, 0);
goto out;
}

/*
* Should the override still be applied when ACLs are enabled?
*/
error = VOP_ACCESSX(vp, accmode, cred, p);
if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
/*
* Try again with VEXPLICIT_DENY, to see if the test for
* deletion is supported.
*/
error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
if (error == 0) {
if (vp->v_type == VDIR) {
accmode &= ~(VDELETE | VDELETE_CHILD);
accmode |= VWRITE;
error = VOP_ACCESSX(vp, accmode, cred, p);
} else if (supportedtypep != NULL) {
*supportedtypep &= ~NFSACCESS_DELETE;
}
}
}

/*
* Allow certain operations for the owner (reads and writes
* on files that are already open).
*/
if (override != NFSACCCHK_NOOVERRIDE &&
(error == EPERM || error == EACCES)) {
if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
error = 0;
else if (override & NFSACCCHK_ALLOWOWNER) {
getret = VOP_GETATTR(vp, &vattr, cred);
if (getret == 0 && cred->cr_uid == vattr.va_uid)
error = 0;
}
}
if (vpislocked == 0)
NFSVOPUNLOCK(vp, 0);

out:
NFSEXITCODE(error);
return (error);
}

/*
* Set attribute(s) vnop.
*/
int
nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
struct thread *p, struct nfsexstuff *exp)
{
int error;

error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
NFSEXITCODE(error);
return (error);
}

/*
* Set up nameidata for a lookup() call and do it.
*/
int
nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
struct vnode **retdirp)
{
struct componentname *cnp = &ndp->ni_cnd;
int i;
struct iovec aiov;
struct uio auio;
int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
int error = 0, crossmnt;
char *cp;

*retdirp = NULL;
cnp->cn_nameptr = cnp->cn_pnbuf;
ndp->ni_lcf = 0;
/*
* Extract and set starting directory.
*/
if (dp->v_type != VDIR) {
if (islocked)
vput(dp);
else
vrele(dp);
nfsvno_relpathbuf(ndp);
error = ENOTDIR;
goto out1;
}
if (islocked)
NFSVOPUNLOCK(dp, 0);
VREF(dp);
*retdirp = dp;
if (NFSVNO_EXRDONLY(exp))
cnp->cn_flags |= RDONLY;
ndp->ni_segflg = UIO_SYSSPACE;
crossmnt = 1;

if (nd->nd_flag & ND_PUBLOOKUP) {
ndp->ni_loopcnt = 0;
if (cnp->cn_pnbuf[0] == '/') {
vrele(dp);
/*
* Check for degenerate pathnames here, since lookup()
* panics on them.
*/
for (i = 1; i < ndp->ni_pathlen; i++)
if (cnp->cn_pnbuf[i] != '/')
break;
if (i == ndp->ni_pathlen) {
error = NFSERR_ACCES;
goto out;
}
dp = rootvnode;
VREF(dp);
}
} else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
(nd->nd_flag & ND_NFSV4) == 0) {
/*
* Only cross mount points for NFSv4 when doing a
* mount while traversing the file system above
* the mount point, unless nfsrv_enable_crossmntpt is set.
*/
cnp->cn_flags |= NOCROSSMOUNT;
crossmnt = 0;
}

/*
* Initialize for scan, set ni_startdir and bump ref on dp again
* because lookup() will dereference ni_startdir.
*/

cnp->cn_thread = p;
ndp->ni_startdir = dp;
ndp->ni_rootdir = rootvnode;
ndp->ni_topdir = NULL;

if (!lockleaf)
cnp->cn_flags |= LOCKLEAF;
for (;;) {
cnp->cn_nameptr = cnp->cn_pnbuf;
/*
* Call lookup() to do the real work. If an error occurs,
* ndp->ni_vp and ni_dvp are left uninitialized or NULL and
* we do not have to dereference anything before returning.
* In either case ni_startdir will be dereferenced and NULLed
* out.
*/
error = lookup(ndp);
if (error)
break;

/*
* Check for encountering a symbolic link. Trivial
* termination occurs if no symlink encountered.
*/
if ((cnp->cn_flags & ISSYMLINK) == 0) {
if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
nfsvno_relpathbuf(ndp);
if (ndp->ni_vp && !lockleaf)
NFSVOPUNLOCK(ndp->ni_vp, 0);
break;
}

/*
* Validate symlink
*/
if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
NFSVOPUNLOCK(ndp->ni_dvp, 0);
if (!(nd->nd_flag & ND_PUBLOOKUP)) {
error = EINVAL;
goto badlink2;
}

if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
error = ELOOP;
goto badlink2;
}
if (ndp->ni_pathlen > 1)
cp = uma_zalloc(namei_zone, M_WAITOK);
else
cp = cnp->cn_pnbuf;
aiov.iov_base = cp;
aiov.iov_len = MAXPATHLEN;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_td = NULL;
auio.uio_resid = MAXPATHLEN;
error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
if (error) {
badlink1:
if (ndp->ni_pathlen > 1)
uma_zfree(namei_zone, cp);
badlink2:
vrele(ndp->ni_dvp);
vput(ndp->ni_vp);
break;
}
linklen = MAXPATHLEN - auio.uio_resid;
if (linklen == 0) {
error = ENOENT;
goto badlink1;
}
if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
error = ENAMETOOLONG;
goto badlink1;
}

/*
* Adjust or replace path
*/
if (ndp->ni_pathlen > 1) {
NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
uma_zfree(namei_zone, cnp->cn_pnbuf);
cnp->cn_pnbuf = cp;
} else
cnp->cn_pnbuf[linklen] = '\0';
ndp->ni_pathlen += linklen;

/*
* Cleanup refs for next loop and check if root directory
* should replace current directory. Normally ni_dvp
* becomes the new base directory and is cleaned up when
* we loop. Explicitly null pointers after invalidation
* to clarify operation.
*/
vput(ndp->ni_vp);
ndp->ni_vp = NULL;

if (cnp->cn_pnbuf[0] == '/') {
vrele(ndp->ni_dvp);
ndp->ni_dvp = ndp->ni_rootdir;
VREF(ndp->ni_dvp);
}
ndp->ni_startdir = ndp->ni_dvp;
ndp->ni_dvp = NULL;
}
if (!lockleaf)
cnp->cn_flags &= ~LOCKLEAF;

out:
if (error) {
nfsvno_relpathbuf(ndp);
ndp->ni_vp = NULL;
ndp->ni_dvp = NULL;
ndp->ni_startdir = NULL;
} else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
ndp->ni_dvp = NULL;
}

out1:
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Set up a pathname buffer and return a pointer to it and, optionally
* set a hash pointer.
*/
void
nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
{
struct componentname *cnp = &ndp->ni_cnd;

cnp->cn_flags |= (NOMACCHECK | HASBUF);
cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
if (hashpp != NULL)
*hashpp = NULL;
*bufpp = cnp->cn_pnbuf;
}

/*
* Release the above path buffer, if not released by nfsvno_namei().
*/
void
nfsvno_relpathbuf(struct nameidata *ndp)
{

if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
panic("nfsrelpath");
uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
ndp->ni_cnd.cn_flags &= ~HASBUF;
}

/*
* Readlink vnode op into an mbuf list.
*/
int
nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
{
struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
struct iovec *ivp = iv;
struct uio io, *uiop = &io;
struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
int i, len, tlen, error = 0;

len = 0;
i = 0;
while (len < NFS_MAXPATHLEN) {
NFSMGET(mp);
MCLGET(mp, M_WAITOK);
mp->m_len = M_SIZE(mp);
if (len == 0) {
mp3 = mp2 = mp;
} else {
mp2->m_next = mp;
mp2 = mp;
}
if ((len + mp->m_len) > NFS_MAXPATHLEN) {
mp->m_len = NFS_MAXPATHLEN - len;
len = NFS_MAXPATHLEN;
} else {
len += mp->m_len;
}
ivp->iov_base = mtod(mp, caddr_t);
ivp->iov_len = mp->m_len;
i++;
ivp++;
}
uiop->uio_iov = iv;
uiop->uio_iovcnt = i;
uiop->uio_offset = 0;
uiop->uio_resid = len;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_td = NULL;
error = VOP_READLINK(vp, uiop, cred);
if (error) {
m_freem(mp3);
*lenp = 0;
goto out;
}
if (uiop->uio_resid > 0) {
len -= uiop->uio_resid;
tlen = NFSM_RNDUP(len);
nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
}
*lenp = len;
*mpp = mp3;
*mpendp = mp;

out:
NFSEXITCODE(error);
return (error);
}

/*
* Read vnode op call into mbuf list.
*/
int
nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
{
struct mbuf *m;
int i;
struct iovec *iv;
struct iovec *iv2;
int error = 0, len, left, siz, tlen, ioflag = 0;
struct mbuf *m2 = NULL, *m3;
struct uio io, *uiop = &io;
struct nfsheur *nh;

len = left = NFSM_RNDUP(cnt);
m3 = NULL;
/*
* Generate the mbuf list with the uio_iov ref. to it.
*/
i = 0;
while (left > 0) {
NFSMGET(m);
MCLGET(m, M_WAITOK);
m->m_len = 0;
siz = uimin(M_TRAILINGSPACE(m), left);
left -= siz;
i++;
if (m3)
m2->m_next = m;
else
m3 = m;
m2 = m;
}
MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
M_TEMP, M_WAITOK);
uiop->uio_iov = iv2 = iv;
m = m3;
left = len;
i = 0;
while (left > 0) {
if (m == NULL)
panic("nfsvno_read iov");
siz = uimin(M_TRAILINGSPACE(m), left);
if (siz > 0) {
iv->iov_base = mtod(m, caddr_t) + m->m_len;
iv->iov_len = siz;
m->m_len += siz;
left -= siz;
iv++;
i++;
}
m = m->m_next;
}
uiop->uio_iovcnt = i;
uiop->uio_offset = off;
uiop->uio_resid = len;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
uiop->uio_td = NULL;
nh = nfsrv_sequential_heuristic(uiop, vp);
ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
/* XXX KDM make this more systematic? */
nfsstatsv1.srvbytes[NFSV4OP_READ] += uiop->uio_resid;
error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
FREE((caddr_t)iv2, M_TEMP);
if (error) {
m_freem(m3);
*mpp = NULL;
goto out;
}
nh->nh_nextoff = uiop->uio_offset;
tlen = len - uiop->uio_resid;
cnt = cnt < tlen ? cnt : tlen;
tlen = NFSM_RNDUP(cnt);
if (tlen == 0) {
m_freem(m3);
m3 = NULL;
} else if (len != tlen || tlen != cnt)
nfsrv_adj(m3, len - tlen, tlen - cnt);
*mpp = m3;
*mpendp = m2;

out:
NFSEXITCODE(error);
return (error);
}

/*
* Write vnode op from an mbuf list.
*/
int
nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
{
struct iovec *ivp;
int i, len;
struct iovec *iv;
int ioflags, error;
struct uio io, *uiop = &io;
struct nfsheur *nh;

MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
M_WAITOK);
uiop->uio_iov = iv = ivp;
uiop->uio_iovcnt = cnt;
i = mtod(mp, caddr_t) + mp->m_len - cp;
len = retlen;
while (len > 0) {
if (mp == NULL)
panic("nfsvno_write");
if (i > 0) {
i = uimin(i, len);
ivp->iov_base = cp;
ivp->iov_len = i;
ivp++;
len -= i;
}
mp = mp->m_next;
if (mp) {
i = mp->m_len;
cp = mtod(mp, caddr_t);
}
}

if (stable == NFSWRITE_UNSTABLE)
ioflags = IO_NODELOCKED;
else
ioflags = (IO_SYNC | IO_NODELOCKED);
uiop->uio_resid = retlen;
uiop->uio_rw = UIO_WRITE;
uiop->uio_segflg = UIO_SYSSPACE;
NFSUIOPROC(uiop, p);
uiop->uio_offset = off;
nh = nfsrv_sequential_heuristic(uiop, vp);
ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
/* XXX KDM make this more systematic? */
nfsstatsv1.srvbytes[NFSV4OP_WRITE] += uiop->uio_resid;
error = VOP_WRITE(vp, uiop, ioflags, cred);
if (error == 0)
nh->nh_nextoff = uiop->uio_offset;
FREE((caddr_t)iv, M_TEMP);

NFSEXITCODE(error);
return (error);
}

/*
* Common code for creating a regular file (plus special files for V2).
*/
int
nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
{
u_quad_t tempsize;
int error;

error = nd->nd_repstat;
if (!error && ndp->ni_vp == NULL) {
if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
vrele(ndp->ni_startdir);
error = VOP_CREATE(ndp->ni_dvp,
&ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
vput(ndp->ni_dvp);
nfsvno_relpathbuf(ndp);
if (!error) {
if (*exclusive_flagp) {
*exclusive_flagp = 0;
NFSVNO_ATTRINIT(nvap);
nvap->na_atime.tv_sec = cverf[0];
nvap->na_atime.tv_nsec = cverf[1];
error = VOP_SETATTR(ndp->ni_vp,
&nvap->na_vattr, nd->nd_cred);
if (error != 0) {
vput(ndp->ni_vp);
ndp->ni_vp = NULL;
error = NFSERR_NOTSUPP;
}
}
}
/*
* NFS V2 Only. nfsrvd_mknod() does this for V3.
* (This implies, just get out on an error.)
*/
} else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
nvap->na_type == VFIFO) {
if (nvap->na_type == VCHR && rdev == 0xffffffff)
nvap->na_type = VFIFO;
if (nvap->na_type != VFIFO &&
(error = priv_check_cred(nd->nd_cred,
PRIV_VFS_MKNOD_DEV, 0))) {
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
vput(ndp->ni_dvp);
goto out;
}
nvap->na_rdev = rdev;
error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
&ndp->ni_cnd, &nvap->na_vattr);
vput(ndp->ni_dvp);
nfsvno_relpathbuf(ndp);
vrele(ndp->ni_startdir);
if (error)
goto out;
} else {
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
vput(ndp->ni_dvp);
error = ENXIO;
goto out;
}
*vpp = ndp->ni_vp;
} else {
/*
* Handle cases where error is already set and/or
* the file exists.
* 1 - clean up the lookup
* 2 - iff !error and na_size set, truncate it
*/
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
*vpp = ndp->ni_vp;
if (ndp->ni_dvp == *vpp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
if (!error && nvap->na_size != VNOVAL) {
error = nfsvno_accchk(*vpp, VWRITE,
nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
NFSACCCHK_VPISLOCKED, NULL);
if (!error) {
tempsize = nvap->na_size;
NFSVNO_ATTRINIT(nvap);
nvap->na_size = tempsize;
error = VOP_SETATTR(*vpp,
&nvap->na_vattr, nd->nd_cred);
}
}
if (error)
vput(*vpp);
}

out:
NFSEXITCODE(error);
return (error);
}

/*
* Do a mknod vnode op.
*/
int
nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
struct thread *p)
{
int error = 0;
enum vtype vtyp;

vtyp = nvap->na_type;
/*
* Iff doesn't exist, create it.
*/
if (ndp->ni_vp) {
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
vput(ndp->ni_dvp);
vrele(ndp->ni_vp);
error = EEXIST;
goto out;
}
if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
vput(ndp->ni_dvp);
error = NFSERR_BADTYPE;
goto out;
}
if (vtyp == VSOCK) {
vrele(ndp->ni_startdir);
error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
&ndp->ni_cnd, &nvap->na_vattr);
vput(ndp->ni_dvp);
nfsvno_relpathbuf(ndp);
} else {
if (nvap->na_type != VFIFO &&
(error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
vput(ndp->ni_dvp);
goto out;
}
error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
&ndp->ni_cnd, &nvap->na_vattr);
vput(ndp->ni_dvp);
nfsvno_relpathbuf(ndp);
vrele(ndp->ni_startdir);
/*
* Since VOP_MKNOD returns the ni_vp, I can't
* see any reason to do the lookup.
*/
}

out:
NFSEXITCODE(error);
return (error);
}

/*
* Mkdir vnode op.
*/
int
nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
{
int error = 0;

if (ndp->ni_vp != NULL) {
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vrele(ndp->ni_vp);
nfsvno_relpathbuf(ndp);
error = EEXIST;
goto out;
}
error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
&nvap->na_vattr);
vput(ndp->ni_dvp);
nfsvno_relpathbuf(ndp);

out:
NFSEXITCODE(error);
return (error);
}

/*
* symlink vnode op.
*/
int
nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
struct nfsexstuff *exp)
{
int error = 0;

if (ndp->ni_vp) {
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vrele(ndp->ni_vp);
error = EEXIST;
goto out;
}

error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
&nvap->na_vattr, pathcp);
vput(ndp->ni_dvp);
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
/*
* Although FreeBSD still had the lookup code in
* it for 7/current, there doesn't seem to be any
* point, since VOP_SYMLINK() returns the ni_vp.
* Just vput it for v2.
*/
if (!not_v2 && !error)
vput(ndp->ni_vp);

out:
NFSEXITCODE(error);
return (error);
}

/*
* Parse symbolic link arguments.
* This function has an ugly side effect. It will MALLOC() an area for
* the symlink and set iov_base to point to it, only if it succeeds.
* So, if it returns with uiop->uio_iov->iov_base != NULL, that must
* be FREE'd later.
*/
int
nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
struct thread *p, char **pathcpp, int *lenp)
{
u_int32_t *tl;
char *pathcp = NULL;
int error = 0, len;
struct nfsv2_sattr *sp;

*pathcpp = NULL;
*lenp = 0;
if ((nd->nd_flag & ND_NFSV3) &&
(error = nfsrv_sattr(nd, NULL, nvap, NULL, NULL, p)))
goto nfsmout;
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
len = fxdr_unsigned(int, *tl);
if (len > NFS_MAXPATHLEN || len <= 0) {
error = EBADRPC;
goto nfsmout;
}
MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
error = nfsrv_mtostr(nd, pathcp, len);
if (error)
goto nfsmout;
if (nd->nd_flag & ND_NFSV2) {
NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
}
*pathcpp = pathcp;
*lenp = len;
NFSEXITCODE2(0, nd);
return (0);
nfsmout:
if (pathcp)
free(pathcp, M_TEMP);
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Remove a non-directory object.
*/
int
nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
struct thread *p, struct nfsexstuff *exp)
{
struct vnode *vp;
int error = 0;

vp = ndp->ni_vp;
if (vp->v_type == VDIR)
error = NFSERR_ISDIR;
else if (is_v4)
error = nfsrv_checkremove(vp, 1, p);
if (!error)
error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vput(vp);
if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
nfsvno_relpathbuf(ndp);
NFSEXITCODE(error);
return (error);
}

/*
* Remove a directory.
*/
int
nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
struct thread *p, struct nfsexstuff *exp)
{
struct vnode *vp;
int error = 0;

vp = ndp->ni_vp;
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
/*
* No rmdir "." please.
*/
if (ndp->ni_dvp == vp) {
error = EINVAL;
goto out;
}
/*
* The root of a mounted filesystem cannot be deleted.
*/
if (vp->v_vflag & VV_ROOT)
error = EBUSY;
out:
if (!error)
error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
vput(vp);
if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
nfsvno_relpathbuf(ndp);
NFSEXITCODE(error);
return (error);
}

/*
* Rename vnode op.
*/
int
nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
{
struct vnode *fvp, *tvp, *tdvp;
int error = 0;

fvp = fromndp->ni_vp;
if (ndstat) {
vrele(fromndp->ni_dvp);
vrele(fvp);
error = ndstat;
goto out1;
}
tdvp = tondp->ni_dvp;
tvp = tondp->ni_vp;
if (tvp != NULL) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
goto out;
}
if (tvp->v_type == VDIR && tvp->v_mountedhere) {
error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
goto out;
}

/*
* A rename to '.' or '..' results in a prematurely
* unlocked vnode on FreeBSD5, so I'm just going to fail that
* here.
*/
if ((tondp->ni_cnd.cn_namelen == 1 &&
tondp->ni_cnd.cn_nameptr[0] == '.') ||
(tondp->ni_cnd.cn_namelen == 2 &&
tondp->ni_cnd.cn_nameptr[0] == '.' &&
tondp->ni_cnd.cn_nameptr[1] == '.')) {
error = EINVAL;
goto out;
}
}
if (fvp->v_type == VDIR && fvp->v_mountedhere) {
error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
goto out;
}
if (fvp->v_mount != tdvp->v_mount) {
error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
goto out;
}
if (fvp == tdvp) {
error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
goto out;
}
if (fvp == tvp) {
/*
* If source and destination are the same, there is nothing to
* do. Set error to -1 to indicate this.
*/
error = -1;
goto out;
}
if (ndflag & ND_NFSV4) {
if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
error = nfsrv_checkremove(fvp, 0, p);
NFSVOPUNLOCK(fvp, 0);
} else
error = EPERM;
if (tvp && !error)
error = nfsrv_checkremove(tvp, 1, p);
} else {
/*
* For NFSv2 and NFSv3, try to get rid of the delegation, so
* that the NFSv4 client won't be confused by the rename.
* Since nfsd_recalldelegation() can only be called on an
* unlocked vnode at this point and fvp is the file that will
* still exist after the rename, just do fvp.
*/
nfsd_recalldelegation(fvp, p);
}
out:
if (!error) {
error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
&fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
&tondp->ni_cnd);
} else {
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fromndp->ni_dvp);
vrele(fvp);
if (error == -1)
error = 0;
}
vrele(tondp->ni_startdir);
nfsvno_relpathbuf(tondp);
out1:
vrele(fromndp->ni_startdir);
nfsvno_relpathbuf(fromndp);
NFSEXITCODE(error);
return (error);
}

/*
* Link vnode op.
*/
int
nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
struct thread *p, struct nfsexstuff *exp)
{
struct vnode *xp;
int error = 0;

xp = ndp->ni_vp;
if (xp != NULL) {
error = EEXIST;
} else {
xp = ndp->ni_dvp;
if (vp->v_mount != xp->v_mount)
error = EXDEV;
}
if (!error) {
NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
if ((vp->v_iflag & VI_DOOMED) == 0)
error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
else
error = EPERM;
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
NFSVOPUNLOCK(vp, 0);
} else {
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
if (ndp->ni_vp)
vrele(ndp->ni_vp);
}
nfsvno_relpathbuf(ndp);
NFSEXITCODE(error);
return (error);
}

/*
* Do the fsync() appropriate for the commit.
*/
int
nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
struct thread *td)
{
int error = 0;

/*
* RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
* file is done. At this time VOP_FSYNC does not accept offset and
* byte count parameters so call VOP_FSYNC the whole file for now.
* The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
* File systems that do not use the buffer cache (as indicated
* by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
*/
if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
(vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
/*
* Give up and do the whole thing
*/
if (vp->v_object &&
(vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
VM_OBJECT_WLOCK(vp->v_object);
vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
VM_OBJECT_WUNLOCK(vp->v_object);
}
error = VOP_FSYNC(vp, MNT_WAIT, td);
} else {
/*
* Locate and synchronously write any buffers that fall
* into the requested range. Note: we are assuming that
* f_iosize is a power of 2.
*/
int iosize = vp->v_mount->mnt_stat.f_iosize;
int iomask = iosize - 1;
struct bufobj *bo;
daddr_t lblkno;

/*
* Align to iosize boundary, super-align to page boundary.
*/
if (off & iomask) {
cnt += off & iomask;
off &= ~(u_quad_t)iomask;
}
if (off & PAGE_MASK) {
cnt += off & PAGE_MASK;
off &= ~(u_quad_t)PAGE_MASK;
}
lblkno = off / iosize;

if (vp->v_object &&
(vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
VM_OBJECT_WLOCK(vp->v_object);
vm_object_page_clean(vp->v_object, off, off + cnt,
OBJPC_SYNC);
VM_OBJECT_WUNLOCK(vp->v_object);
}

bo = &vp->v_bufobj;
BO_LOCK(bo);
while (cnt > 0) {
struct buf *bp;

/*
* If we have a buffer and it is marked B_DELWRI we
* have to lock and write it. Otherwise the prior
* write is assumed to have already been committed.
*
* gbincore() can return invalid buffers now so we
* have to check that bit as well (though B_DELWRI
* should not be set if B_INVAL is set there could be
* a race here since we haven't locked the buffer).
*/
if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
BO_LOCK(bo);
continue; /* retry */
}
if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
B_DELWRI) {
bremfree(bp);
bp->b_flags &= ~B_ASYNC;
bwrite(bp);
++nfs_commit_miss;
} else
BUF_UNLOCK(bp);
BO_LOCK(bo);
}
++nfs_commit_blks;
if (cnt < iosize)
break;
cnt -= iosize;
++lblkno;
}
BO_UNLOCK(bo);
}
NFSEXITCODE(error);
return (error);
}

/*
* Statfs vnode op.
*/
int
nfsvno_statfs(struct vnode *vp, struct statfs *sf)
{
int error;

error = VFS_STATFS(vp->v_mount, sf);
if (error == 0) {
/*
* Since NFS handles these values as unsigned on the
* wire, there is no way to represent negative values,
* so set them to 0. Without this, they will appear
* to be very large positive values for clients like
* Solaris10.
*/
if (sf->f_bavail < 0)
sf->f_bavail = 0;
if (sf->f_ffree < 0)
sf->f_ffree = 0;
}
NFSEXITCODE(error);
return (error);
}

/*
* Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
* must handle nfsrv_opencheck() calls after any other access checks.
*/
void
nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
struct nfsexstuff *exp, struct vnode **vpp)
{
struct vnode *vp = NULL;
u_quad_t tempsize;
struct nfsexstuff nes;

if (ndp->ni_vp == NULL)
nd->nd_repstat = nfsrv_opencheck(clientid,
stateidp, stp, NULL, nd, p, nd->nd_repstat);
if (!nd->nd_repstat) {
if (ndp->ni_vp == NULL) {
vrele(ndp->ni_startdir);
nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
&ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
vput(ndp->ni_dvp);
nfsvno_relpathbuf(ndp);
if (!nd->nd_repstat) {
if (*exclusive_flagp) {
*exclusive_flagp = 0;
NFSVNO_ATTRINIT(nvap);
nvap->na_atime.tv_sec = cverf[0];
nvap->na_atime.tv_nsec = cverf[1];
nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
&nvap->na_vattr, cred);
if (nd->nd_repstat != 0) {
vput(ndp->ni_vp);
ndp->ni_vp = NULL;
nd->nd_repstat = NFSERR_NOTSUPP;
}
} else {
nfsrv_fixattr(nd, ndp->ni_vp, nvap,
aclp, p, attrbitp, exp);
}
}
vp = ndp->ni_vp;
} else {
if (ndp->ni_startdir)
vrele(ndp->ni_startdir);
nfsvno_relpathbuf(ndp);
vp = ndp->ni_vp;
if (create == NFSV4OPEN_CREATE) {
if (ndp->ni_dvp == vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
}
if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
if (ndp->ni_cnd.cn_flags & RDONLY)
NFSVNO_SETEXRDONLY(&nes);
else
NFSVNO_EXINIT(&nes);
nd->nd_repstat = nfsvno_accchk(vp,
VWRITE, cred, &nes, p,
NFSACCCHK_NOOVERRIDE,
NFSACCCHK_VPISLOCKED, NULL);
nd->nd_repstat = nfsrv_opencheck(clientid,
stateidp, stp, vp, nd, p, nd->nd_repstat);
if (!nd->nd_repstat) {
tempsize = nvap->na_size;
NFSVNO_ATTRINIT(nvap);
nvap->na_size = tempsize;
nd->nd_repstat = VOP_SETATTR(vp,
&nvap->na_vattr, cred);
}
} else if (vp->v_type == VREG) {
nd->nd_repstat = nfsrv_opencheck(clientid,
stateidp, stp, vp, nd, p, nd->nd_repstat);
}
}
} else {
if (ndp->ni_cnd.cn_flags & HASBUF)
nfsvno_relpathbuf(ndp);
if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
vrele(ndp->ni_startdir);
if (ndp->ni_dvp == ndp->ni_vp)
vrele(ndp->ni_dvp);
else
vput(ndp->ni_dvp);
if (ndp->ni_vp)
vput(ndp->ni_vp);
}
}
*vpp = vp;

NFSEXITCODE2(0, nd);
}

/*
* Updates the file rev and sets the mtime and ctime
* to the current clock time, returning the va_filerev and va_Xtime
* values.
* Return ESTALE to indicate the vnode is VI_DOOMED.
*/
int
nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
struct ucred *cred, struct thread *p)
{
struct vattr va;

VATTR_NULL(&va);
vfs_timestamp(&va.va_mtime);
if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
if ((vp->v_iflag & VI_DOOMED) != 0)
return (ESTALE);
}
(void) VOP_SETATTR(vp, &va, cred);
(void) nfsvno_getattr(vp, nvap, cred, p, 1);
return (0);
}

/*
* Glue routine to nfsv4_fillattr().
*/
int
nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
struct ucred *cred, struct thread *p, int isdgram, int reterr,
int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
{
int error;

error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
mounted_on_fileno);
NFSEXITCODE2(0, nd);
return (error);
}

/* Since the Readdir vnode ops vary, put the entire functions in here. */
/*
* nfs readdir service
* - mallocs what it thinks is enough to read
* count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
* - calls VOP_READDIR()
* - loops around building the reply
* if the output generated exceeds count break out of loop
* The NFSM_CLGET macro is used here so that the reply will be packed
* tightly in mbuf clusters.
* - it trims out records with d_fileno == 0
* this doesn't matter for Unix clients, but they might confuse clients
* for other os'.
* - it trims out records with d_type == DT_WHT
* these cannot be seen through NFS (unless we extend the protocol)
* The alternate call nfsrvd_readdirplus() does lookups as well.
* PS: The NFS protocol spec. does not clarify what the "count" byte
* argument is a count of.. just name strings and file id's or the
* entire reply rpc or ...
* I tried just file name and id sizes and it confused the Sun client,
* so I am using the full rpc size now. The "paranoia.." comment refers
* to including the status longwords that are not a part of the dir.
* "entry" structures, but are in the rpc.
*/
int
nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
{
struct dirent *dp;
u_int32_t *tl;
int dirlen;
char *cpos, *cend, *rbuf;
struct nfsvattr at;
int nlen, error = 0, getret = 1;
int siz, cnt, fullsiz, eofflag, ncookies;
u_int64_t off, toff, verf;
u_long *cookies = NULL, *cookiep;
struct uio io;
struct iovec iv;
int is_ufs;

if (nd->nd_repstat) {
nfsrv_postopattr(nd, getret, &at);
goto out;
}
if (nd->nd_flag & ND_NFSV2) {
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
off = fxdr_unsigned(u_quad_t, *tl++);
} else {
NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
off = fxdr_hyper(tl);
tl += 2;
verf = fxdr_hyper(tl);
tl += 2;
}
toff = off;
cnt = fxdr_unsigned(int, *tl);
if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
cnt = NFS_SRVMAXDATA(nd);
siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
fullsiz = siz;
if (nd->nd_flag & ND_NFSV3) {
nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
p, 1);
#if 0
/*
* va_filerev is not sufficient as a cookie verifier,
* since it is not supposed to change when entries are
* removed/added unless that offset cookies returned to
* the client are no longer valid.
*/
if (!nd->nd_repstat && toff && verf != at.na_filerev)
nd->nd_repstat = NFSERR_BAD_COOKIE;
#endif
}
if (!nd->nd_repstat && vp->v_type != VDIR)
nd->nd_repstat = NFSERR_NOTDIR;
if (nd->nd_repstat == 0 && cnt == 0) {
if (nd->nd_flag & ND_NFSV2)
/* NFSv2 does not have NFSERR_TOOSMALL */
nd->nd_repstat = EPERM;
else
nd->nd_repstat = NFSERR_TOOSMALL;
}
if (!nd->nd_repstat)
nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
NFSACCCHK_VPISLOCKED, NULL);
if (nd->nd_repstat) {
vput(vp);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
goto out;
}
is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
again:
eofflag = 0;
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
}

iv.iov_base = rbuf;
iv.iov_len = siz;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_offset = (off_t)off;
io.uio_resid = siz;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_td = NULL;
nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
&cookies);
off = (u_int64_t)io.uio_offset;
if (io.uio_resid)
siz -= io.uio_resid;

if (!cookies && !nd->nd_repstat)
nd->nd_repstat = NFSERR_PERM;
if (nd->nd_flag & ND_NFSV3) {
getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
if (!nd->nd_repstat)
nd->nd_repstat = getret;
}

/*
* Handles the failed cases. nd->nd_repstat == 0 past here.
*/
if (nd->nd_repstat) {
vput(vp);
free((caddr_t)rbuf, M_TEMP);
if (cookies)
free((caddr_t)cookies, M_TEMP);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
goto out;
}
/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vput(vp);
if (nd->nd_flag & ND_NFSV2) {
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
} else {
nfsrv_postopattr(nd, getret, &at);
NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
txdr_hyper(at.na_filerev, tl);
tl += 2;
}
*tl++ = newnfs_false;
*tl = newnfs_true;
FREE((caddr_t)rbuf, M_TEMP);
FREE((caddr_t)cookies, M_TEMP);
goto out;
}

/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf;
cend = rbuf + siz;
dp = (struct dirent *)cpos;
cookiep = cookies;

/*
* For some reason FreeBSD's ufs_readdir() chooses to back the
* directory offset up to a block boundary, so it is necessary to
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
(is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos >= cend || ncookies == 0) {
siz = fullsiz;
toff = off;
goto again;
}
vput(vp);

/*
* dirlen is the size of the reply, including all XDR and must
* not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
* if the XDR should be included in "count", but to be safe, we do.
* (Include the two booleans at the end of the reply in dirlen now.)
*/
if (nd->nd_flag & ND_NFSV3) {
nfsrv_postopattr(nd, getret, &at);
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
txdr_hyper(at.na_filerev, tl);
dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
} else {
dirlen = 2 * NFSX_UNSIGNED;
}

/* Loop through the records and build reply */
while (cpos < cend && ncookies > 0) {
nlen = dp->d_namlen;
if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
nlen <= NFS_MAXNAMLEN) {
if (nd->nd_flag & ND_NFSV3)
dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
else
dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
if (dirlen > cnt) {
eofflag = 0;
break;
}

/*
* Build the directory record xdr from
* the dirent entry.
*/
if (nd->nd_flag & ND_NFSV3) {
NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
*tl++ = newnfs_true;
*tl++ = 0;
} else {
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = newnfs_true;
}
*tl = txdr_unsigned(dp->d_fileno);
(void) nfsm_strtom(nd, dp->d_name, nlen);
if (nd->nd_flag & ND_NFSV3) {
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = 0;
} else
NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(*cookiep);
}
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos < cend)
eofflag = 0;
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = newnfs_false;
if (eofflag)
*tl = newnfs_true;
else
*tl = newnfs_false;
FREE((caddr_t)rbuf, M_TEMP);
FREE((caddr_t)cookies, M_TEMP);

out:
NFSEXITCODE2(0, nd);
return (0);
nfsmout:
vput(vp);
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Readdirplus for V3 and Readdir for V4.
*/
int
nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
{
struct dirent *dp;
u_int32_t *tl;
int dirlen;
char *cpos, *cend, *rbuf;
struct vnode *nvp;
fhandle_t nfh;
struct nfsvattr nva, at, *nvap = &nva;
struct mbuf *mb0, *mb1;
struct nfsreferral *refp;
int nlen, r, error = 0, getret = 1, usevget = 1;
int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
caddr_t bpos0, bpos1;
u_int64_t off, toff, verf;
u_long *cookies = NULL, *cookiep;
nfsattrbit_t attrbits, rderrbits, savbits;
struct uio io;
struct iovec iv;
struct componentname cn;
int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
struct mount *mp, *new_mp;
uint64_t mounted_on_fileno;

if (nd->nd_repstat) {
nfsrv_postopattr(nd, getret, &at);
goto out;
}
NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
off = fxdr_hyper(tl);
toff = off;
tl += 2;
verf = fxdr_hyper(tl);
tl += 2;
siz = fxdr_unsigned(int, *tl++);
cnt = fxdr_unsigned(int, *tl);

/*
* Use the server's maximum data transfer size as the upper bound
* on reply datalen.
*/
if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
cnt = NFS_SRVMAXDATA(nd);

/*
* siz is a "hint" of how much directory information (name, fileid,
* cookie) should be in the reply. At least one client "hints" 0,
* so I set it to cnt for that case. I also round it up to the
* next multiple of DIRBLKSIZ.
*/
if (siz <= 0)
siz = cnt;
siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));

if (nd->nd_flag & ND_NFSV4) {
error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
if (error)
goto nfsmout;
NFSSET_ATTRBIT(&savbits, &attrbits);
NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
NFSZERO_ATTRBIT(&rderrbits);
NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
} else {
NFSZERO_ATTRBIT(&attrbits);
}
fullsiz = siz;
nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
if (!nd->nd_repstat) {
if (off && verf != at.na_filerev) {
/*
* va_filerev is not sufficient as a cookie verifier,
* since it is not supposed to change when entries are
* removed/added unless that offset cookies returned to
* the client are no longer valid.
*/
#if 0
if (nd->nd_flag & ND_NFSV4) {
nd->nd_repstat = NFSERR_NOTSAME;
} else {
nd->nd_repstat = NFSERR_BAD_COOKIE;
}
#endif
} else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
nd->nd_repstat = NFSERR_BAD_COOKIE;
}
}
if (!nd->nd_repstat && vp->v_type != VDIR)
nd->nd_repstat = NFSERR_NOTDIR;
if (!nd->nd_repstat && cnt == 0)
nd->nd_repstat = NFSERR_TOOSMALL;
if (!nd->nd_repstat)
nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
NFSACCCHK_VPISLOCKED, NULL);
if (nd->nd_repstat) {
vput(vp);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
goto out;
}
is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;

MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
again:
eofflag = 0;
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
}

iv.iov_base = rbuf;
iv.iov_len = siz;
io.uio_iov = &iv;
io.uio_iovcnt = 1;
io.uio_offset = (off_t)off;
io.uio_resid = siz;
io.uio_segflg = UIO_SYSSPACE;
io.uio_rw = UIO_READ;
io.uio_td = NULL;
nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
&cookies);
off = (u_int64_t)io.uio_offset;
if (io.uio_resid)
siz -= io.uio_resid;

getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);

if (!cookies && !nd->nd_repstat)
nd->nd_repstat = NFSERR_PERM;
if (!nd->nd_repstat)
nd->nd_repstat = getret;
if (nd->nd_repstat) {
vput(vp);
if (cookies)
free((caddr_t)cookies, M_TEMP);
free((caddr_t)rbuf, M_TEMP);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
goto out;
}
/*
* If nothing read, return eof
* rpc reply
*/
if (siz == 0) {
vput(vp);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
txdr_hyper(at.na_filerev, tl);
tl += 2;
*tl++ = newnfs_false;
*tl = newnfs_true;
free((caddr_t)cookies, M_TEMP);
free((caddr_t)rbuf, M_TEMP);
goto out;
}

/*
* Check for degenerate cases of nothing useful read.
* If so go try again
*/
cpos = rbuf;
cend = rbuf + siz;
dp = (struct dirent *)cpos;
cookiep = cookies;

/*
* For some reason FreeBSD's ufs_readdir() chooses to back the
* directory offset up to a block boundary, so it is necessary to
* skip over the records that precede the requested offset. This
* requires the assumption that file offset cookies monotonically
* increase.
*/
while (cpos < cend && ncookies > 0 &&
(dp->d_fileno == 0 || dp->d_type == DT_WHT ||
(is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
((nd->nd_flag & ND_NFSV4) &&
((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
(dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
if (cpos >= cend || ncookies == 0) {
siz = fullsiz;
toff = off;
goto again;
}

/*
* Busy the file system so that the mount point won't go away
* and, as such, VFS_VGET() can be used safely.
*/
mp = vp->v_mount;
vfs_ref(mp);
NFSVOPUNLOCK(vp, 0);
nd->nd_repstat = vfs_busy(mp, 0);
vfs_rel(mp);
if (nd->nd_repstat != 0) {
vrele(vp);
free(cookies, M_TEMP);
free(rbuf, M_TEMP);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
goto out;
}

/*
* Check to see if entries in this directory can be safely acquired
* via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
* ZFS snapshot directories need VOP_LOOKUP(), so that any
* automount of the snapshot directory that is required will
* be done.
* This needs to be done here for NFSv4, since NFSv4 never does
* a VFS_VGET() for "." or "..".
*/
if (is_zfs == 1) {
r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
if (r == EOPNOTSUPP) {
usevget = 0;
cn.cn_nameiop = LOOKUP;
cn.cn_lkflags = LK_SHARED | LK_RETRY;
cn.cn_cred = nd->nd_cred;
cn.cn_thread = p;
} else if (r == 0)
vput(nvp);
}

/*
* Save this position, in case there is an error before one entry
* is created.
*/
mb0 = nd->nd_mb;
bpos0 = nd->nd_bpos;

/*
* Fill in the first part of the reply.
* dirlen is the reply length in bytes and cannot exceed cnt.
* (Include the two booleans at the end of the reply in dirlen now,
* so we recognize when we have exceeded cnt.)
*/
if (nd->nd_flag & ND_NFSV3) {
dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
nfsrv_postopattr(nd, getret, &at);
} else {
dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
}
NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
txdr_hyper(at.na_filerev, tl);

/*
* Save this position, in case there is an empty reply needed.
*/
mb1 = nd->nd_mb;
bpos1 = nd->nd_bpos;

/* Loop through the records and build reply */
entrycnt = 0;
while (cpos < cend && ncookies > 0 && dirlen < cnt) {
nlen = dp->d_namlen;
if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
nlen <= NFS_MAXNAMLEN &&
((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
(nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
|| (nlen == 1 && dp->d_name[0] != '.'))) {
/*
* Save the current position in the reply, in case
* this entry exceeds cnt.
*/
mb1 = nd->nd_mb;
bpos1 = nd->nd_bpos;

/*
* For readdir_and_lookup get the vnode using
* the file number.
*/
nvp = NULL;
refp = NULL;
r = 0;
at_root = 0;
needs_unbusy = 0;
new_mp = mp;
mounted_on_fileno = (uint64_t)dp->d_fileno;
if ((nd->nd_flag & ND_NFSV3) ||
NFSNONZERO_ATTRBIT(&savbits)) {
if (nd->nd_flag & ND_NFSV4)
refp = nfsv4root_getreferral(NULL,
vp, dp->d_fileno);
if (refp == NULL) {
if (usevget)
r = VFS_VGET(mp, dp->d_fileno,
LK_SHARED, &nvp);
else
r = EOPNOTSUPP;
if (r == EOPNOTSUPP) {
if (usevget) {
usevget = 0;
cn.cn_nameiop = LOOKUP;
cn.cn_lkflags =
LK_SHARED |
LK_RETRY;
cn.cn_cred =
nd->nd_cred;
cn.cn_thread = p;
}
cn.cn_nameptr = dp->d_name;
cn.cn_namelen = nlen;
cn.cn_flags = ISLASTCN |
NOFOLLOW | LOCKLEAF;
if (nlen == 2 &&
dp->d_name[0] == '.' &&
dp->d_name[1] == '.')
cn.cn_flags |=
ISDOTDOT;
if (NFSVOPLOCK(vp, LK_SHARED)
!= 0) {
nd->nd_repstat = EPERM;
break;
}
if ((vp->v_vflag & VV_ROOT) != 0
&& (cn.cn_flags & ISDOTDOT)
!= 0) {
vref(vp);
nvp = vp;
r = 0;
} else {
r = VOP_LOOKUP(vp, &nvp,
&cn);
if (vp != nvp)
NFSVOPUNLOCK(vp,
0);
}
}

/*
* For NFSv4, check to see if nvp is
* a mount point and get the mount
* point vnode, as required.
*/
if (r == 0 &&
nfsrv_enable_crossmntpt != 0 &&
(nd->nd_flag & ND_NFSV4) != 0 &&
nvp->v_type == VDIR &&
nvp->v_mountedhere != NULL) {
new_mp = nvp->v_mountedhere;
r = vfs_busy(new_mp, 0);
vput(nvp);
nvp = NULL;
if (r == 0) {
r = VFS_ROOT(new_mp,
LK_SHARED, &nvp);
needs_unbusy = 1;
if (r == 0)
at_root = 1;
}
}
}
if (!r) {
if (refp == NULL &&
((nd->nd_flag & ND_NFSV3) ||
NFSNONZERO_ATTRBIT(&attrbits))) {
r = nfsvno_getfh(nvp, &nfh, p);
if (!r)
r = nfsvno_getattr(nvp, nvap,
nd->nd_cred, p, 1);
if (r == 0 && is_zfs == 1 &&
nfsrv_enable_crossmntpt != 0 &&
(nd->nd_flag & ND_NFSV4) != 0 &&
nvp->v_type == VDIR &&
vp->v_mount != nvp->v_mount) {
/*
* For a ZFS snapshot, there is a
* pseudo mount that does not set
* v_mountedhere, so it needs to
* be detected via a different
* mount structure.
*/
at_root = 1;
if (new_mp == mp)
new_mp = nvp->v_mount;
}
}
} else {
nvp = NULL;
}
if (r) {
if (!NFSISSET_ATTRBIT(&attrbits,
NFSATTRBIT_RDATTRERROR)) {
if (nvp != NULL)
vput(nvp);
if (needs_unbusy != 0)
vfs_unbusy(new_mp);
nd->nd_repstat = r;
break;
}
}
}

/*
* Build the directory record xdr
*/
if (nd->nd_flag & ND_NFSV3) {
NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
*tl++ = newnfs_true;
*tl++ = 0;
*tl = txdr_unsigned(dp->d_fileno);
dirlen += nfsm_strtom(nd, dp->d_name, nlen);
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = 0;
*tl = txdr_unsigned(*cookiep);
nfsrv_postopattr(nd, 0, nvap);
dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
if (nvp != NULL)
vput(nvp);
} else {
NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
*tl++ = newnfs_true;
*tl++ = 0;
*tl = txdr_unsigned(*cookiep);
dirlen += nfsm_strtom(nd, dp->d_name, nlen);
if (nvp != NULL) {
supports_nfsv4acls =
nfs_supportsnfsv4acls(nvp);
NFSVOPUNLOCK(nvp, 0);
} else
supports_nfsv4acls = 0;
if (refp != NULL) {
dirlen += nfsrv_putreferralattr(nd,
&savbits, refp, 0,
&nd->nd_repstat);
if (nd->nd_repstat) {
if (nvp != NULL)
vrele(nvp);
if (needs_unbusy != 0)
vfs_unbusy(new_mp);
break;
}
} else if (r) {
dirlen += nfsvno_fillattr(nd, new_mp,
nvp, nvap, &nfh, r, &rderrbits,
nd->nd_cred, p, isdgram, 0,
supports_nfsv4acls, at_root,
mounted_on_fileno);
} else {
dirlen += nfsvno_fillattr(nd, new_mp,
nvp, nvap, &nfh, r, &attrbits,
nd->nd_cred, p, isdgram, 0,
supports_nfsv4acls, at_root,
mounted_on_fileno);
}
if (nvp != NULL)
vrele(nvp);
dirlen += (3 * NFSX_UNSIGNED);
}
if (needs_unbusy != 0)
vfs_unbusy(new_mp);
if (dirlen <= cnt)
entrycnt++;
}
cpos += dp->d_reclen;
dp = (struct dirent *)cpos;
cookiep++;
ncookies--;
}
vrele(vp);
vfs_unbusy(mp);

/*
* If dirlen > cnt, we must strip off the last entry. If that
* results in an empty reply, report NFSERR_TOOSMALL.
*/
if (dirlen > cnt || nd->nd_repstat) {
if (!nd->nd_repstat && entrycnt == 0)
nd->nd_repstat = NFSERR_TOOSMALL;
if (nd->nd_repstat) {
newnfs_trimtrailing(nd, mb0, bpos0);
if (nd->nd_flag & ND_NFSV3)
nfsrv_postopattr(nd, getret, &at);
} else
newnfs_trimtrailing(nd, mb1, bpos1);
eofflag = 0;
} else if (cpos < cend)
eofflag = 0;
if (!nd->nd_repstat) {
NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = newnfs_false;
if (eofflag)
*tl = newnfs_true;
else
*tl = newnfs_false;
}
FREE((caddr_t)cookies, M_TEMP);
FREE((caddr_t)rbuf, M_TEMP);

out:
NFSEXITCODE2(0, nd);
return (0);
nfsmout:
vput(vp);
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Get the settable attributes out of the mbuf list.
* (Return 0 or EBADRPC)
*/
int
nfsrv_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
{
u_int32_t *tl;
struct nfsv2_sattr *sp;
int error = 0, toclient = 0;

switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
case ND_NFSV2:
NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
/*
* Some old clients didn't fill in the high order 16bits.
* --> check the low order 2 bytes for 0xffff
*/
if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
nvap->na_mode = nfstov_mode(sp->sa_mode);
if (sp->sa_uid != newnfs_xdrneg1)
nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
if (sp->sa_gid != newnfs_xdrneg1)
nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
if (sp->sa_size != newnfs_xdrneg1)
nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
#ifdef notyet
fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
#else
nvap->na_atime.tv_sec =
fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
nvap->na_atime.tv_nsec = 0;
#endif
}
if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
break;
case ND_NFSV3:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (*tl == newnfs_true) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
nvap->na_mode = nfstov_mode(*tl);
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (*tl == newnfs_true) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
nvap->na_uid = fxdr_unsigned(uid_t, *tl);
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (*tl == newnfs_true) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
nvap->na_gid = fxdr_unsigned(gid_t, *tl);
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (*tl == newnfs_true) {
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
nvap->na_size = fxdr_hyper(tl);
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
switch (fxdr_unsigned(int, *tl)) {
case NFSV3SATTRTIME_TOCLIENT:
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
fxdr_nfsv3time(tl, &nvap->na_atime);
toclient = 1;
break;
case NFSV3SATTRTIME_TOSERVER:
vfs_timestamp(&nvap->na_atime);
nvap->na_vaflags |= VA_UTIMES_NULL;
break;
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
switch (fxdr_unsigned(int, *tl)) {
case NFSV3SATTRTIME_TOCLIENT:
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
fxdr_nfsv3time(tl, &nvap->na_mtime);
nvap->na_vaflags &= ~VA_UTIMES_NULL;
break;
case NFSV3SATTRTIME_TOSERVER:
vfs_timestamp(&nvap->na_mtime);
if (!toclient)
nvap->na_vaflags |= VA_UTIMES_NULL;
break;
}
break;
case ND_NFSV4:
error = nfsv4_sattr(nd, vp, nvap, attrbitp, aclp, p);
}
nfsmout:
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Handle the setable attributes for V4.
* Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
*/
int
nfsv4_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
{
u_int32_t *tl;
int attrsum = 0;
int i, j;
int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
int toclient = 0;
u_char *cp, namestr[NFSV4_SMALLSTR + 1];
uid_t uid;
gid_t gid;

error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
if (error)
goto nfsmout;
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
attrsize = fxdr_unsigned(int, *tl);

/*
* Loop around getting the setable attributes. If an unsupported
* one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
*/
if (retnotsup) {
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
bitpos = NFSATTRBIT_MAX;
} else {
bitpos = 0;
}
for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
if (attrsum > attrsize) {
error = NFSERR_BADXDR;
goto nfsmout;
}
if (NFSISSET_ATTRBIT(attrbitp, bitpos))
switch (bitpos) {
case NFSATTRBIT_SIZE:
NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
if (vp != NULL && vp->v_type != VREG) {
error = (vp->v_type == VDIR) ? NFSERR_ISDIR :
NFSERR_INVAL;
goto nfsmout;
}
nvap->na_size = fxdr_hyper(tl);
attrsum += NFSX_HYPER;
break;
case NFSATTRBIT_ACL:
error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
p);
if (error)
goto nfsmout;
if (aceerr && !nd->nd_repstat)
nd->nd_repstat = aceerr;
attrsum += aclsize;
break;
case NFSATTRBIT_ARCHIVE:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (!nd->nd_repstat)
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
attrsum += NFSX_UNSIGNED;
break;
case NFSATTRBIT_HIDDEN:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (!nd->nd_repstat)
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
attrsum += NFSX_UNSIGNED;
break;
case NFSATTRBIT_MIMETYPE:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
if (error)
goto nfsmout;
if (!nd->nd_repstat)
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
break;
case NFSATTRBIT_MODE:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
nvap->na_mode = nfstov_mode(*tl);
attrsum += NFSX_UNSIGNED;
break;
case NFSATTRBIT_OWNER:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
j = fxdr_unsigned(int, *tl);
if (j < 0) {
error = NFSERR_BADXDR;
goto nfsmout;
}
if (j > NFSV4_SMALLSTR)
cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
else
cp = namestr;
error = nfsrv_mtostr(nd, cp, j);
if (error) {
if (j > NFSV4_SMALLSTR)
free(cp, M_NFSSTRING);
goto nfsmout;
}
if (!nd->nd_repstat) {
nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
p);
if (!nd->nd_repstat)
nvap->na_uid = uid;
}
if (j > NFSV4_SMALLSTR)
free(cp, M_NFSSTRING);
attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
break;
case NFSATTRBIT_OWNERGROUP:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
j = fxdr_unsigned(int, *tl);
if (j < 0) {
error = NFSERR_BADXDR;
goto nfsmout;
}
if (j > NFSV4_SMALLSTR)
cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
else
cp = namestr;
error = nfsrv_mtostr(nd, cp, j);
if (error) {
if (j > NFSV4_SMALLSTR)
free(cp, M_NFSSTRING);
goto nfsmout;
}
if (!nd->nd_repstat) {
nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
p);
if (!nd->nd_repstat)
nvap->na_gid = gid;
}
if (j > NFSV4_SMALLSTR)
free(cp, M_NFSSTRING);
attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
break;
case NFSATTRBIT_SYSTEM:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (!nd->nd_repstat)
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
attrsum += NFSX_UNSIGNED;
break;
case NFSATTRBIT_TIMEACCESSSET:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
attrsum += NFSX_UNSIGNED;
if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
fxdr_nfsv4time(tl, &nvap->na_atime);
toclient = 1;
attrsum += NFSX_V4TIME;
} else {
vfs_timestamp(&nvap->na_atime);
nvap->na_vaflags |= VA_UTIMES_NULL;
}
break;
case NFSATTRBIT_TIMEBACKUP:
NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
if (!nd->nd_repstat)
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
attrsum += NFSX_V4TIME;
break;
case NFSATTRBIT_TIMECREATE:
NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
if (!nd->nd_repstat)
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
attrsum += NFSX_V4TIME;
break;
case NFSATTRBIT_TIMEMODIFYSET:
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
attrsum += NFSX_UNSIGNED;
if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
fxdr_nfsv4time(tl, &nvap->na_mtime);
nvap->na_vaflags &= ~VA_UTIMES_NULL;
attrsum += NFSX_V4TIME;
} else {
vfs_timestamp(&nvap->na_mtime);
if (!toclient)
nvap->na_vaflags |= VA_UTIMES_NULL;
}
break;
default:
nd->nd_repstat = NFSERR_ATTRNOTSUPP;
/*
* set bitpos so we drop out of the loop.
*/
bitpos = NFSATTRBIT_MAX;
break;
}
}

/*
* some clients pad the attrlist, so we need to skip over the
* padding.
*/
if (attrsum > attrsize) {
error = NFSERR_BADXDR;
} else {
attrsize = NFSM_RNDUP(attrsize);
if (attrsum < attrsize)
error = nfsm_advance(nd, attrsize - attrsum, -1);
}
nfsmout:
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Check/setup export credentials.
*/
int
nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
struct ucred *credanon)
{
int error = 0;

/*
* Check/setup credentials.
*/
if (nd->nd_flag & ND_GSS)
exp->nes_exflag &= ~MNT_EXPORTANON;

/*
* Check to see if the operation is allowed for this security flavor.
* RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
* AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
* Also, allow Secinfo, so that it can acquire the correct flavor(s).
*/
if (nfsvno_testexp(nd, exp) &&
nd->nd_procnum != NFSV4OP_SECINFO &&
nd->nd_procnum != NFSPROC_FSINFO) {
if (nd->nd_flag & ND_NFSV4)
error = NFSERR_WRONGSEC;
else
error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
goto out;
}

/*
* Check to see if the file system is exported V4 only.
*/
if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
error = NFSERR_PROGNOTV4;
goto out;
}

/*
* Now, map the user credentials.
* (Note that ND_AUTHNONE will only be set for an NFSv3
* Fsinfo RPC. If set for anything else, this code might need
* to change.)
*/
if (NFSVNO_EXPORTED(exp)) {
if (((nd->nd_flag & ND_GSS) == 0 && nd->nd_cred->cr_uid == 0) ||
NFSVNO_EXPORTANON(exp) ||
(nd->nd_flag & ND_AUTHNONE) != 0) {
nd->nd_cred->cr_uid = credanon->cr_uid;
nd->nd_cred->cr_gid = credanon->cr_gid;
crsetgroups(nd->nd_cred, credanon->cr_ngroups,
credanon->cr_groups);
} else if ((nd->nd_flag & ND_GSS) == 0) {
/*
* If using AUTH_SYS, call nfsrv_getgrpscred() to see
* if there is a replacement credential with a group
* list set up by "nfsuserd -manage-gids".
* If there is no replacement, nfsrv_getgrpscred()
* simply returns its argument.
*/
nd->nd_cred = nfsrv_getgrpscred(nd->nd_cred);
}
}

out:
NFSEXITCODE2(error, nd);
return (error);
}

/*
* Check exports.
*/
int
nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
struct ucred **credp)
{
int i, error, *secflavors;

error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
&exp->nes_numsecflavor, &secflavors);
if (error) {
if (nfs_rootfhset) {
exp->nes_exflag = 0;
exp->nes_numsecflavor = 0;
error = 0;
}
} else {
/* Copy the security flavors. */
for (i = 0; i < exp->nes_numsecflavor; i++)
exp->nes_secflavors[i] = secflavors[i];
}
NFSEXITCODE(error);
return (error);
}

/*
* Get a vnode for a file handle and export stuff.
*/
int
nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
int lktype, struct vnode **vpp, struct nfsexstuff *exp,
struct ucred **credp)
{
int i, error, *secflavors;

*credp = NULL;
exp->nes_numsecflavor = 0;
error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
if (error != 0)
/* Make sure the server replies ESTALE to the client. */
error = ESTALE;
if (nam && !error) {
error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
&exp->nes_numsecflavor, &secflavors);
if (error) {
if (nfs_rootfhset) {
exp->nes_exflag = 0;
exp->nes_numsecflavor = 0;
error = 0;
} else {
vput(*vpp);
}
} else {
/* Copy the security flavors. */
for (i = 0; i < exp->nes_numsecflavor; i++)
exp->nes_secflavors[i] = secflavors[i];
}
}
NFSEXITCODE(error);
return (error);
}

/*
* nfsd_fhtovp() - convert a fh to a vnode ptr
* - look up fsid in mount list (if not found ret error)
* - get vp and export rights by calling nfsvno_fhtovp()
* - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
* for AUTH_SYS
* - if mpp != NULL, return the mount point so that it can
* be used for vn_finished_write() by the caller
*/
void
nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
struct vnode **vpp, struct nfsexstuff *exp,
struct mount **mpp, int startwrite, struct thread *p)
{
struct mount *mp;
struct ucred *credanon;
fhandle_t *fhp;

fhp = (fhandle_t *)nfp->nfsrvfh_data;
/*
* Check for the special case of the nfsv4root_fh.
*/
mp = vfs_busyfs(&fhp->fh_fsid);
if (mpp != NULL)
*mpp = mp;
if (mp == NULL) {
*vpp = NULL;
nd->nd_repstat = ESTALE;
goto out;
}

if (startwrite) {
vn_start_write(NULL, mpp, V_WAIT);
if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
lktype = LK_EXCLUSIVE;
}
nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
&credanon);
vfs_unbusy(mp);

/*
* For NFSv4 without a pseudo root fs, unexported file handles
* can be returned, so that Lookup works everywhere.
*/
if (!nd->nd_repstat && exp->nes_exflag == 0 &&
!(nd->nd_flag & ND_NFSV4)) {
vput(*vpp);
nd->nd_repstat = EACCES;
}

/*
* Personally, I've never seen any point in requiring a
* reserved port#, since only in the rare case where the
* clients are all boxes with secure system privileges,
* does it provide any enhanced security, but... some people
* believe it to be useful and keep putting this code back in.
* (There is also some "security checker" out there that
* complains if the nfs server doesn't enforce this.)
* However, note the following:
* RFC3530 (NFSv4) specifies that a reserved port# not be
* required.
* RFC2623 recommends that, if a reserved port# is checked for,
* that there be a way to turn that off--> ifdef'd.
*/
#ifdef NFS_REQRSVPORT
if (!nd->nd_repstat) {
struct sockaddr_in *saddr;
struct sockaddr_in6 *saddr6;

saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
if (!(nd->nd_flag & ND_NFSV4) &&
((saddr->sin_family == AF_INET &&
ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
(saddr6->sin6_family == AF_INET6 &&
ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
vput(*vpp);
nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
}
}
#endif /* NFS_REQRSVPORT */

/*
* Check/setup credentials.
*/
if (!nd->nd_repstat) {
nd->nd_saveduid = nd->nd_cred->cr_uid;
nd->nd_repstat = nfsd_excred(nd, exp, credanon);
if (nd->nd_repstat)
vput(*vpp);
}
if (credanon != NULL)
crfree(credanon);
if (nd->nd_repstat) {
if (startwrite)
vn_finished_write(mp);
*vpp = NULL;
if (mpp != NULL)
*mpp = NULL;
}

out:
NFSEXITCODE2(0, nd);
}

/*
* glue for fp.
*/
static int
fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
{
struct filedesc *fdp;
struct file *fp;
int error = 0;

fdp = p->td_proc->p_fd;
if (fd < 0 || fd >= fdp->fd_nfiles ||
(fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
error = EBADF;
goto out;
}
*fpp = fp;

out:
NFSEXITCODE(error);
return (error);
}

/*
* Called from nfssvc() to update the exports list. Just call
* vfs_export(). This has to be done, since the v4 root fake fs isn't
* in the mount list.
*/
int
nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
{
struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
int error = 0;
struct nameidata nd;
fhandle_t fh;

error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
nfs_rootfhset = 0;
else if (error == 0) {
if (nfsexargp->fspec == NULL) {
error = EPERM;
goto out;
}
/*
* If fspec != NULL, this is the v4root path.
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
nfsexargp->fspec, p);
if ((error = namei(&nd)) != 0)
goto out;
error = nfsvno_getfh(nd.ni_vp, &fh, p);
vrele(nd.ni_vp);
if (!error) {
nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
NFSBCOPY((caddr_t)&fh,
nfs_rootfh.nfsrvfh_data,
sizeof (fhandle_t));
nfs_rootfhset = 1;
}
}

out:
NFSEXITCODE(error);
return (error);
}

/*
* This function needs to test to see if the system is near its limit
* for memory allocation via malloc() or mget() and return True iff
* either of these resources are near their limit.
* XXX (For now, this is just a stub.)
*/
int nfsrv_testmalloclimit = 0;
int
nfsrv_mallocmget_limit(void)
{
static int printmesg = 0;
static int testval = 1;

if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
if ((printmesg++ % 100) == 0)
printf("nfsd: malloc/mget near limit\n");
return (1);
}
return (0);
}

/*
* BSD specific initialization of a mount point.
*/
void
nfsd_mntinit(void)
{
static int inited = 0;

if (inited)
return;
inited = 1;
nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
nfsv4root_mnt.mnt_export = NULL;
TAILQ_INIT(&nfsv4root_opt);
TAILQ_INIT(&nfsv4root_newopt);
nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
nfsv4root_mnt.mnt_nvnodelistsize = 0;
nfsv4root_mnt.mnt_activevnodelistsize = 0;
}

/*
* Get a vnode for a file handle, without checking exports, etc.
*/
struct vnode *
nfsvno_getvp(fhandle_t *fhp)
{
struct mount *mp;
struct vnode *vp;
int error;

mp = vfs_busyfs(&fhp->fh_fsid);
if (mp == NULL)
return (NULL);
error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
vfs_unbusy(mp);
if (error)
return (NULL);
return (vp);
}

/*
* Do a local VOP_ADVLOCK().
*/
int
nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
u_int64_t end, struct thread *td)
{
int error = 0;
struct flock fl;
u_int64_t tlen;

if (nfsrv_dolocallocks == 0)
goto out;
ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");

fl.l_whence = SEEK_SET;
fl.l_type = ftype;
fl.l_start = (off_t)first;
if (end == NFS64BITSSET) {
fl.l_len = 0;
} else {
tlen = end - first;
fl.l_len = (off_t)tlen;
}
/*
* For FreeBSD8, the l_pid and l_sysid must be set to the same
* values for all calls, so that all locks will be held by the
* nfsd server. (The nfsd server handles conflicts between the
* various clients.)
* Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
* bytes, so it can't be put in l_sysid.
*/
if (nfsv4_sysid == 0)
nfsv4_sysid = nlm_acquire_next_sysid();
fl.l_pid = (pid_t)0;
fl.l_sysid = (int)nfsv4_sysid;

if (ftype == F_UNLCK)
error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
(F_POSIX | F_REMOTE));
else
error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
(F_POSIX | F_REMOTE));

out:
NFSEXITCODE(error);
return (error);
}

/*
* Check the nfsv4 root exports.
*/
int
nfsvno_v4rootexport(struct nfsrv_descript *nd)
{
struct ucred *credanon;
int exflags, error = 0, numsecflavor, *secflavors, i;

error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
&credanon, &numsecflavor, &secflavors);
if (error) {
error = NFSERR_PROGUNAVAIL;
goto out;
}
if (credanon != NULL)
crfree(credanon);
for (i = 0; i < numsecflavor; i++) {
if (secflavors[i] == AUTH_SYS)
nd->nd_flag |= ND_EXAUTHSYS;
else if (secflavors[i] == RPCSEC_GSS_KRB5)
nd->nd_flag |= ND_EXGSS;
else if (secflavors[i] == RPCSEC_GSS_KRB5I)
nd->nd_flag |= ND_EXGSSINTEGRITY;
else if (secflavors[i] == RPCSEC_GSS_KRB5P)
nd->nd_flag |= ND_EXGSSPRIVACY;
}

out:
NFSEXITCODE(error);
return (error);
}

/*
* Nfs server pseudo system call for the nfsd's
*/
/*
* MPSAFE
*/
static int
nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
{
struct file *fp;
struct nfsd_addsock_args sockarg;
struct nfsd_nfsd_args nfsdarg;
cap_rights_t rights;
int error;

if (uap->flag & NFSSVC_NFSDADDSOCK) {
error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
if (error)
goto out;
/*
* Since we don't know what rights might be required,
* pretend that we need them all. It is better to be too
* careful than too reckless.
*/
error = fget(td, sockarg.sock,
cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
if (error != 0)
goto out;
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
error = EPERM;
goto out;
}
error = nfsrvd_addsock(fp);
fdrop(fp, td);
} else if (uap->flag & NFSSVC_NFSDNFSD) {
if (uap->argp == NULL) {
error = EINVAL;
goto out;
}
error = copyin(uap->argp, (caddr_t)&nfsdarg,
sizeof (nfsdarg));
if (error)
goto out;
error = nfsrvd_nfsd(td, &nfsdarg);
} else {
error = nfssvc_srvcall(td, uap, td->td_ucred);
}

out:
NFSEXITCODE(error);
return (error);
}

static int
nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
{
struct nfsex_args export;
struct file *fp = NULL;
int stablefd, len;
struct nfsd_clid adminrevoke;
struct nfsd_dumplist dumplist;
struct nfsd_dumpclients *dumpclients;
struct nfsd_dumplocklist dumplocklist;
struct nfsd_dumplocks *dumplocks;
struct nameidata nd;
vnode_t vp;
int error = EINVAL, igotlock;
struct proc *procp;
static int suspend_nfsd = 0;

if (uap->flag & NFSSVC_PUBLICFH) {
NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
sizeof (fhandle_t));
error = copyin(uap->argp,
&nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
if (!error)
nfs_pubfhset = 1;
} else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
error = copyin(uap->argp,(caddr_t)&export,
sizeof (struct nfsex_args));
if (!error)
error = nfsrv_v4rootexport(&export, cred, p);
} else if (uap->flag & NFSSVC_NOPUBLICFH) {
nfs_pubfhset = 0;
error = 0;
} else if (uap->flag & NFSSVC_STABLERESTART) {
error = copyin(uap->argp, (caddr_t)&stablefd,
sizeof (int));
if (!error)
error = fp_getfvp(p, stablefd, &fp, &vp);
if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
error = EBADF;
if (!error && newnfs_numnfsd != 0)
error = EPERM;
if (!error) {
nfsrv_stablefirst.nsf_fp = fp;
nfsrv_setupstable(p);
}
} else if (uap->flag & NFSSVC_ADMINREVOKE) {
error = copyin(uap->argp, (caddr_t)&adminrevoke,
sizeof (struct nfsd_clid));
if (!error)
error = nfsrv_adminrevoke(&adminrevoke, p);
} else if (uap->flag & NFSSVC_DUMPCLIENTS) {
error = copyin(uap->argp, (caddr_t)&dumplist,
sizeof (struct nfsd_dumplist));
if (!error && (dumplist.ndl_size < 1 ||
dumplist.ndl_size > NFSRV_MAXDUMPLIST))
error = EPERM;
if (!error) {
len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
dumpclients = (struct nfsd_dumpclients *)malloc(len,
M_TEMP, M_WAITOK);
nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
error = copyout(dumpclients,
CAST_USER_ADDR_T(dumplist.ndl_list), len);
free((caddr_t)dumpclients, M_TEMP);
}
} else if (uap->flag & NFSSVC_DUMPLOCKS) {
error = copyin(uap->argp, (caddr_t)&dumplocklist,
sizeof (struct nfsd_dumplocklist));
if (!error && (dumplocklist.ndllck_size < 1 ||
dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
error = EPERM;
if (!error)
error = nfsrv_lookupfilename(&nd,
dumplocklist.ndllck_fname, p);
if (!error) {
len = sizeof (struct nfsd_dumplocks) *
dumplocklist.ndllck_size;
dumplocks = (struct nfsd_dumplocks *)malloc(len,
M_TEMP, M_WAITOK);
nfsrv_dumplocks(nd.ni_vp, dumplocks,
dumplocklist.ndllck_size, p);
vput(nd.ni_vp);
error = copyout(dumplocks,
CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
free((caddr_t)dumplocks, M_TEMP);
}
} else if (uap->flag & NFSSVC_BACKUPSTABLE) {
procp = p->td_proc;
PROC_LOCK(procp);
nfsd_master_pid = procp->p_pid;
bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
nfsd_master_start = procp->p_stats->p_start;
nfsd_master_proc = procp;
PROC_UNLOCK(procp);
} else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
NFSLOCKV4ROOTMUTEX();
if (suspend_nfsd == 0) {
/* Lock out all nfsd threads */
do {
igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
} while (igotlock == 0 && suspend_nfsd == 0);
suspend_nfsd = 1;
}
NFSUNLOCKV4ROOTMUTEX();
error = 0;
} else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
NFSLOCKV4ROOTMUTEX();
if (suspend_nfsd != 0) {
nfsv4_unlock(&nfsd_suspend_lock, 0);
suspend_nfsd = 0;
}
NFSUNLOCKV4ROOTMUTEX();
error = 0;
}

NFSEXITCODE(error);
return (error);
}

/*
* Check exports.
* Returns 0 if ok, 1 otherwise.
*/
int
nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
{
int i;

/*
* This seems odd, but allow the case where the security flavor
* list is empty. This happens when NFSv4 is traversing non-exported
* file systems. Exported file systems should always have a non-empty
* security flavor list.
*/
if (exp->nes_numsecflavor == 0)
return (0);

for (i = 0; i < exp->nes_numsecflavor; i++) {
/*
* The tests for privacy and integrity must be first,
* since ND_GSS is set for everything but AUTH_SYS.
*/
if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
(nd->nd_flag & ND_GSSPRIVACY))
return (0);
if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
(nd->nd_flag & ND_GSSINTEGRITY))
return (0);
if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
(nd->nd_flag & ND_GSS))
return (0);
if (exp->nes_secflavors[i] == AUTH_SYS &&
(nd->nd_flag & ND_GSS) == 0)
return (0);
}
return (1);
}

/*
* Calculate a hash value for the fid in a file handle.
*/
uint32_t
nfsrv_hashfh(fhandle_t *fhp)
{
uint32_t hashval;

hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
return (hashval);
}

/*
* Calculate a hash value for the sessionid.
*/
uint32_t
nfsrv_hashsessionid(uint8_t *sessionid)
{
uint32_t hashval;

hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
return (hashval);
}

/*
* Signal the userland master nfsd to backup the stable restart file.
*/
void
nfsrv_backupstable(void)
{
struct proc *procp;

if (nfsd_master_proc != NULL) {
procp = pfind(nfsd_master_pid);
/* Try to make sure it is the correct process. */
if (procp == nfsd_master_proc &&
procp->p_stats->p_start.tv_sec ==
nfsd_master_start.tv_sec &&
procp->p_stats->p_start.tv_usec ==
nfsd_master_start.tv_usec &&
strcmp(procp->p_comm, nfsd_master_comm) == 0)
kern_psignal(procp, SIGUSR2);
else
nfsd_master_proc = NULL;

if (procp != NULL)
PROC_UNLOCK(procp);
}
}

extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);

/*
* Called once to initialize data structures...
*/
static int
nfsd_modevent(module_t mod, int type, void *data)
{
int error = 0, i;
static int loaded = 0;

switch (type) {
case MOD_LOAD:
if (loaded)
goto out;
newnfs_portinit();
for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
MTX_DEF);
mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
MTX_DEF);
}
mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
nfsrvd_initcache();
nfsd_init();
NFSD_LOCK();
nfsrvd_init(0);
NFSD_UNLOCK();
nfsd_mntinit();
#ifdef VV_DISABLEDELEG
vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
#endif
nfsd_call_servertimer = nfsrv_servertimer;
nfsd_call_nfsd = nfssvc_nfsd;
loaded = 1;
break;

case MOD_UNLOAD:
if (newnfs_numnfsd != 0) {
error = EBUSY;
break;
}

#ifdef VV_DISABLEDELEG
vn_deleg_ops.vndeleg_recall = NULL;
vn_deleg_ops.vndeleg_disable = NULL;
#endif
nfsd_call_servertimer = NULL;
nfsd_call_nfsd = NULL;

/* Clean out all NFSv4 state. */
nfsrv_throwawayallstate(curthread);

/* Clean the NFS server reply cache */
nfsrvd_cleancache();

/* Free up the krpc server pool. */
if (nfsrvd_pool != NULL)
svcpool_destroy(nfsrvd_pool);

/* and get rid of the locks */
for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
mtx_destroy(&nfsrchash_table[i].mtx);
mtx_destroy(&nfsrcahash_table[i].mtx);
}
mtx_destroy(&nfsrc_udpmtx);
mtx_destroy(&nfs_v4root_mutex);
mtx_destroy(&nfsv4root_mnt.mnt_mtx);
for (i = 0; i < nfsrv_sessionhashsize; i++)
mtx_destroy(&nfssessionhash[i].mtx);
lockdestroy(&nfsv4root_mnt.mnt_explock);
free(nfsclienthash, M_NFSDCLIENT);
free(nfslockhash, M_NFSDLOCKFILE);
free(nfssessionhash, M_NFSDSESSION);
loaded = 0;
break;
default:
error = EOPNOTSUPP;
break;
}

out:
NFSEXITCODE(error);
return (error);
}
static moduledata_t nfsd_mod = {
"nfsd",
nfsd_modevent,
NULL,
};
DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);

/* So that loader and kldload(2) can find us, wherever we are.. */
MODULE_VERSION(nfsd, 1);
MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);