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freebsd-dev/sys/nfsserver/nfs_srvsubs.c
Rick Macklem 694a586a43 Add a lock flags argument to the VFS_FHTOVP() file system 
method, so that callers can indicate the minimum vnode
locking requirement. This will allow some file systems to choose
to return a LK_SHARED locked vnode when LK_SHARED is specified
for the flags argument. This patch only adds the flag. It
does not change any file system to use it and all callers
specify LK_EXCLUSIVE, so file system semantics are not changed.

Reviewed by:	kib
2011-05-22 01:07:54 +00:00

1456 lines
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/*-
* 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.
*
* @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* These functions support the macros and help fiddle mbuf chains for
* the nfs op functions. They do things like create the rpc header and
* copy data between mbuf chains and uio lists.
*/
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mbuf.h>
#include <sys/refcount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sysent.h>
#include <sys/syscall.h>
#include <sys/sysproto.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>
#include <rpc/rpc.h>
#include <nfs/nfsproto.h>
#include <nfsserver/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfsserver/nfsm_subs.h>
#include <netinet/in.h>
/*
* Data items converted to xdr at startup, since they are constant
* This is kinda hokey, but may save a little time doing byte swaps
*/
u_int32_t nfsrv_nfs_xdrneg1;
u_int32_t nfsrv_nfs_true, nfsrv_nfs_false;
/* And other global data */
static const nfstype nfsv2_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR,
NFLNK, NFNON, NFCHR, NFNON };
#define vtonfsv2_type(a) txdr_unsigned(nfsv2_type[((int32_t)(a))])
#define vtonfsv3_mode(m) txdr_unsigned((m) & ALLPERMS)
int nfsrv_ticks;
struct mtx nfsd_mtx;
/*
* Mapping of old NFS Version 2 RPC numbers to generic numbers.
*/
const int nfsrv_nfsv3_procid[NFS_NPROCS] = {
NFSPROC_NULL,
NFSPROC_GETATTR,
NFSPROC_SETATTR,
NFSPROC_NOOP,
NFSPROC_LOOKUP,
NFSPROC_READLINK,
NFSPROC_READ,
NFSPROC_NOOP,
NFSPROC_WRITE,
NFSPROC_CREATE,
NFSPROC_REMOVE,
NFSPROC_RENAME,
NFSPROC_LINK,
NFSPROC_SYMLINK,
NFSPROC_MKDIR,
NFSPROC_RMDIR,
NFSPROC_READDIR,
NFSPROC_FSSTAT,
NFSPROC_NOOP,
NFSPROC_NOOP,
NFSPROC_NOOP,
NFSPROC_NOOP,
NFSPROC_NOOP,
};
/*
* and the reverse mapping from generic to Version 2 procedure numbers
*/
const int nfsrvv2_procid[NFS_NPROCS] = {
NFSV2PROC_NULL,
NFSV2PROC_GETATTR,
NFSV2PROC_SETATTR,
NFSV2PROC_LOOKUP,
NFSV2PROC_NOOP,
NFSV2PROC_READLINK,
NFSV2PROC_READ,
NFSV2PROC_WRITE,
NFSV2PROC_CREATE,
NFSV2PROC_MKDIR,
NFSV2PROC_SYMLINK,
NFSV2PROC_CREATE,
NFSV2PROC_REMOVE,
NFSV2PROC_RMDIR,
NFSV2PROC_RENAME,
NFSV2PROC_LINK,
NFSV2PROC_READDIR,
NFSV2PROC_NOOP,
NFSV2PROC_STATFS,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
};
/*
* Maps errno values to nfs error numbers.
* Use 0 (which gets converted to NFSERR_IO) as the catch all for ones not
* specifically defined in RFC 1094.
*/
static const u_char nfsrv_v2errmap[ELAST] = {
NFSERR_PERM, NFSERR_NOENT, 0, 0, 0,
NFSERR_NXIO, 0, 0, 0, 0,
0, 0, NFSERR_ACCES, 0, 0,
0, NFSERR_EXIST, 0, NFSERR_NODEV, NFSERR_NOTDIR,
NFSERR_ISDIR, 0, 0, 0, 0,
0, NFSERR_FBIG, NFSERR_NOSPC, 0, NFSERR_ROFS,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, NFSERR_NAMETOL, 0, 0,
NFSERR_NOTEMPTY, 0, 0, NFSERR_DQUOT, NFSERR_STALE,
0
};
/*
* Maps errno values to nfs error numbers.
* Although it is not obvious whether or not NFS clients really care if
* a returned error value is in the specified list for the procedure, the
* safest thing to do is filter them appropriately. For Version 2, the
* X/Open XNFS document is the only specification that defines error values
* for each RPC (The RFC simply lists all possible error values for all RPCs),
* so I have decided to not do this for Version 2.
* The first entry is the default error return and the rest are the valid
* errors for that RPC in increasing numeric order.
*/
static const short nfsv3err_null[] = {
0,
0,
};
static const short nfsv3err_getattr[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_setattr[] = {
NFSERR_IO,
NFSERR_PERM,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_INVAL,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOT_SYNC,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_lookup[] = {
NFSERR_IO,
NFSERR_NOENT,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_NOTDIR,
NFSERR_NAMETOL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_access[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_readlink[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_INVAL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_read[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_NXIO,
NFSERR_ACCES,
NFSERR_INVAL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_write[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_INVAL,
NFSERR_FBIG,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_create[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_NOTDIR,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_NAMETOL,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_mkdir[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_NOTDIR,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_NAMETOL,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_symlink[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_NOTDIR,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_NAMETOL,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_mknod[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_NOTDIR,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_NAMETOL,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
NFSERR_BADTYPE,
0,
};
static const short nfsv3err_remove[] = {
NFSERR_IO,
NFSERR_NOENT,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_NOTDIR,
NFSERR_ROFS,
NFSERR_NAMETOL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_rmdir[] = {
NFSERR_IO,
NFSERR_NOENT,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_NOTDIR,
NFSERR_INVAL,
NFSERR_ROFS,
NFSERR_NAMETOL,
NFSERR_NOTEMPTY,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_rename[] = {
NFSERR_IO,
NFSERR_NOENT,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_XDEV,
NFSERR_NOTDIR,
NFSERR_ISDIR,
NFSERR_INVAL,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_MLINK,
NFSERR_NAMETOL,
NFSERR_NOTEMPTY,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_link[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_EXIST,
NFSERR_XDEV,
NFSERR_NOTDIR,
NFSERR_INVAL,
NFSERR_NOSPC,
NFSERR_ROFS,
NFSERR_MLINK,
NFSERR_NAMETOL,
NFSERR_DQUOT,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_readdir[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_NOTDIR,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_BAD_COOKIE,
NFSERR_TOOSMALL,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_readdirplus[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_NOTDIR,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_BAD_COOKIE,
NFSERR_NOTSUPP,
NFSERR_TOOSMALL,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_fsstat[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_fsinfo[] = {
NFSERR_STALE,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_pathconf[] = {
NFSERR_STALE,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short nfsv3err_commit[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static const short *nfsrv_v3errmap[] = {
nfsv3err_null,
nfsv3err_getattr,
nfsv3err_setattr,
nfsv3err_lookup,
nfsv3err_access,
nfsv3err_readlink,
nfsv3err_read,
nfsv3err_write,
nfsv3err_create,
nfsv3err_mkdir,
nfsv3err_symlink,
nfsv3err_mknod,
nfsv3err_remove,
nfsv3err_rmdir,
nfsv3err_rename,
nfsv3err_link,
nfsv3err_readdir,
nfsv3err_readdirplus,
nfsv3err_fsstat,
nfsv3err_fsinfo,
nfsv3err_pathconf,
nfsv3err_commit,
};
extern int (*nfsd_call_nfsserver)(struct thread *, struct nfssvc_args *);
/*
* Called once to initialize data structures...
*/
static int
nfsrv_modevent(module_t mod, int type, void *data)
{
int error = 0;
switch (type) {
case MOD_LOAD:
mtx_init(&nfsd_mtx, "nfsd_mtx", NULL, MTX_DEF);
nfsrv_nfs_true = txdr_unsigned(TRUE);
nfsrv_nfs_false = txdr_unsigned(FALSE);
nfsrv_nfs_xdrneg1 = txdr_unsigned(-1);
nfsrv_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
if (nfsrv_ticks < 1)
nfsrv_ticks = 1;
NFSD_LOCK();
nfsrv_init(0); /* Init server data structures */
NFSD_UNLOCK();
nfsd_call_nfsserver = nfssvc_nfsserver;
break;
case MOD_UNLOAD:
if (nfsrv_numnfsd != 0) {
error = EBUSY;
break;
}
nfsd_call_nfsserver = NULL;
callout_drain(&nfsrv_callout);
mtx_destroy(&nfsd_mtx);
break;
default:
error = EOPNOTSUPP;
break;
}
return error;
}
static moduledata_t nfsserver_mod = {
"nfsserver",
nfsrv_modevent,
NULL,
};
DECLARE_MODULE(nfsserver, nfsserver_mod, SI_SUB_VFS, SI_ORDER_ANY);
/* So that loader and kldload(2) can find us, wherever we are.. */
MODULE_VERSION(nfsserver, 1);
MODULE_DEPEND(nfsserver, nfssvc, 1, 1, 1);
MODULE_DEPEND(nfsserver, krpc, 1, 1, 1);
MODULE_DEPEND(nfsserver, nfs_common, 1, 1, 1);
/*
* Set up nameidata for a lookup() call and do it.
*
* If pubflag is set, this call is done for a lookup operation on the
* public filehandle. In that case we allow crossing mountpoints and
* absolute pathnames. However, the caller is expected to check that
* the lookup result is within the public fs, and deny access if
* it is not.
*
* nfs_namei() clears out garbage fields that namei() might leave garbage.
* This is mainly ni_vp and ni_dvp when an error occurs, and ni_dvp when no
* error occurs but the parent was not requested.
*
* dirp may be set whether an error is returned or not, and must be
* released by the caller.
*/
int
nfs_namei(struct nameidata *ndp, struct nfsrv_descript *nfsd,
fhandle_t *fhp, int len, struct nfssvc_sock *slp,
struct sockaddr *nam, struct mbuf **mdp,
caddr_t *dposp, struct vnode **retdirp, int v3, struct vattr *retdirattrp,
int *retdirattr_retp, int pubflag)
{
int i, rem;
struct mbuf *md;
char *fromcp, *tocp, *cp;
struct iovec aiov;
struct uio auio;
struct vnode *dp;
int error, rdonly, linklen;
struct componentname *cnp = &ndp->ni_cnd;
int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0;
int dvfslocked;
int vfslocked;
vfslocked = 0;
dvfslocked = 0;
*retdirp = NULL;
cnp->cn_flags |= NOMACCHECK;
cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
/*
* Copy the name from the mbuf list to ndp->ni_pnbuf
* and set the various ndp fields appropriately.
*/
fromcp = *dposp;
tocp = cnp->cn_pnbuf;
md = *mdp;
rem = mtod(md, caddr_t) + md->m_len - fromcp;
for (i = 0; i < len; i++) {
while (rem == 0) {
md = md->m_next;
if (md == NULL) {
error = EBADRPC;
goto out;
}
fromcp = mtod(md, caddr_t);
rem = md->m_len;
}
if (*fromcp == '\0' || (!pubflag && *fromcp == '/')) {
error = EACCES;
goto out;
}
*tocp++ = *fromcp++;
rem--;
}
*tocp = '\0';
*mdp = md;
*dposp = fromcp;
len = nfsm_rndup(len)-len;
if (len > 0) {
if (rem >= len)
*dposp += len;
else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
goto out;
}
if (!pubflag && nfs_ispublicfh(fhp))
return (ESTALE);
/*
* Extract and set starting directory.
*/
error = nfsrv_fhtovp(fhp, 0, &dp, &dvfslocked, nfsd, slp, nam, &rdonly);
if (error)
goto out;
vfslocked = VFS_LOCK_GIANT(dp->v_mount);
if (dp->v_type != VDIR) {
vput(dp);
error = ENOTDIR;
goto out;
}
if (rdonly)
cnp->cn_flags |= RDONLY;
/*
* Set return directory. Reference to dp is implicitly transfered
* to the returned pointer
*/
*retdirp = dp;
if (v3) {
*retdirattr_retp = VOP_GETATTR(dp, retdirattrp,
ndp->ni_cnd.cn_cred);
}
VOP_UNLOCK(dp, 0);
if (pubflag) {
/*
* Oh joy. For WebNFS, handle those pesky '%' escapes,
* and the 'native path' indicator.
*/
cp = uma_zalloc(namei_zone, M_WAITOK);
fromcp = cnp->cn_pnbuf;
tocp = cp;
if ((unsigned char)*fromcp >= WEBNFS_SPECCHAR_START) {
switch ((unsigned char)*fromcp) {
case WEBNFS_NATIVE_CHAR:
/*
* 'Native' path for us is the same
* as a path according to the NFS spec,
* just skip the escape char.
*/
fromcp++;
break;
/*
* More may be added in the future, range 0x80-0xff
*/
default:
error = EIO;
uma_zfree(namei_zone, cp);
goto out;
}
}
/*
* Translate the '%' escapes, URL-style.
*/
while (*fromcp != '\0') {
if (*fromcp == WEBNFS_ESC_CHAR) {
if (fromcp[1] != '\0' && fromcp[2] != '\0') {
fromcp++;
*tocp++ = HEXSTRTOI(fromcp);
fromcp += 2;
continue;
} else {
error = ENOENT;
uma_zfree(namei_zone, cp);
goto out;
}
} else
*tocp++ = *fromcp++;
}
*tocp = '\0';
uma_zfree(namei_zone, cnp->cn_pnbuf);
cnp->cn_pnbuf = cp;
}
ndp->ni_pathlen = (tocp - cnp->cn_pnbuf) + 1;
ndp->ni_segflg = UIO_SYSSPACE;
if (pubflag) {
ndp->ni_rootdir = rootvnode;
ndp->ni_loopcnt = 0;
if (cnp->cn_pnbuf[0] == '/') {
int tvfslocked;
tvfslocked = VFS_LOCK_GIANT(rootvnode->v_mount);
VFS_UNLOCK_GIANT(vfslocked);
dp = rootvnode;
vfslocked = tvfslocked;
}
} else {
cnp->cn_flags |= NOCROSSMOUNT;
}
/*
* Initialize for scan, set ni_startdir and bump ref on dp again
* because lookup() will dereference ni_startdir.
*/
cnp->cn_thread = curthread;
VREF(dp);
ndp->ni_startdir = dp;
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.
*/
if (vfslocked)
ndp->ni_cnd.cn_flags |= GIANTHELD;
error = lookup(ndp);
vfslocked = (ndp->ni_cnd.cn_flags & GIANTHELD) != 0;
ndp->ni_cnd.cn_flags &= ~GIANTHELD;
if (error)
break;
/*
* Check for encountering a symbolic link. Trivial
* termination occurs if no symlink encountered.
* Note: zfree is safe because error is 0, so we will
* not zfree it again when we break.
*/
if ((cnp->cn_flags & ISSYMLINK) == 0) {
if (cnp->cn_flags & (SAVENAME | SAVESTART))
cnp->cn_flags |= HASBUF;
else
uma_zfree(namei_zone, cnp->cn_pnbuf);
if (ndp->ni_vp && !lockleaf)
VOP_UNLOCK(ndp->ni_vp, 0);
break;
}
/*
* Validate symlink
*/
if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
VOP_UNLOCK(ndp->ni_dvp, 0);
if (!pubflag) {
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:
vput(ndp->ni_vp);
vrele(ndp->ni_dvp);
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) {
bcopy(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;
if (cnp->cn_flags & GIANTHELD) {
mtx_unlock(&Giant);
cnp->cn_flags &= ~GIANTHELD;
}
/*
* nfs_namei() guarentees that fields will not contain garbage
* whether an error occurs or not. This allows the caller to track
* cleanup state trivially.
*/
out:
if (error) {
uma_zfree(namei_zone, cnp->cn_pnbuf);
ndp->ni_vp = NULL;
ndp->ni_dvp = NULL;
ndp->ni_startdir = NULL;
cnp->cn_flags &= ~HASBUF;
VFS_UNLOCK_GIANT(vfslocked);
vfslocked = 0;
} else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
ndp->ni_dvp = NULL;
}
/*
* This differs from normal namei() in that even on failure we may
* return with Giant held due to the dirp return. Make sure we only
* have not recursed however. The calling code only expects to drop
* one acquire.
*/
if (vfslocked || dvfslocked)
ndp->ni_cnd.cn_flags |= GIANTHELD;
if (vfslocked && dvfslocked)
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* A fiddled version of m_adj() that ensures null fill to a long
* boundary and only trims off the back end
*/
void
nfsm_adj(struct mbuf *mp, int len, int nul)
{
struct mbuf *m;
int count, i;
char *cp;
/*
* Trim from tail. Scan the mbuf chain,
* calculating its length and finding the last mbuf.
* If the adjustment only affects this mbuf, then just
* adjust and return. Otherwise, rescan and truncate
* after the remaining size.
*/
count = 0;
m = mp;
for (;;) {
count += m->m_len;
if (m->m_next == NULL)
break;
m = m->m_next;
}
if (m->m_len > len) {
m->m_len -= len;
if (nul > 0) {
cp = mtod(m, caddr_t)+m->m_len-nul;
for (i = 0; i < nul; i++)
*cp++ = '\0';
}
return;
}
count -= len;
if (count < 0)
count = 0;
/*
* Correct length for chain is "count".
* Find the mbuf with last data, adjust its length,
* and toss data from remaining mbufs on chain.
*/
for (m = mp; m; m = m->m_next) {
if (m->m_len >= count) {
m->m_len = count;
if (nul > 0) {
cp = mtod(m, caddr_t)+m->m_len-nul;
for (i = 0; i < nul; i++)
*cp++ = '\0';
}
if (m->m_next != NULL) {
m_freem(m->m_next);
m->m_next = NULL;
}
break;
}
count -= m->m_len;
}
}
/*
* Make these functions instead of macros, so that the kernel text size
* doesn't get too big...
*/
void
nfsm_srvwcc(struct nfsrv_descript *nfsd, int before_ret,
struct vattr *before_vap, int after_ret, struct vattr *after_vap,
struct mbuf **mbp, char **bposp)
{
struct mbuf *mb = *mbp;
char *bpos = *bposp;
u_int32_t *tl;
if (before_ret) {
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = nfsrv_nfs_false;
} else {
tl = nfsm_build(u_int32_t *, 7 * NFSX_UNSIGNED);
*tl++ = nfsrv_nfs_true;
txdr_hyper(before_vap->va_size, tl);
tl += 2;
txdr_nfsv3time(&(before_vap->va_mtime), tl);
tl += 2;
txdr_nfsv3time(&(before_vap->va_ctime), tl);
}
*bposp = bpos;
*mbp = mb;
nfsm_srvpostopattr(nfsd, after_ret, after_vap, mbp, bposp);
}
void
nfsm_srvpostopattr(struct nfsrv_descript *nfsd, int after_ret,
struct vattr *after_vap, struct mbuf **mbp, char **bposp)
{
struct mbuf *mb = *mbp;
char *bpos = *bposp;
u_int32_t *tl;
struct nfs_fattr *fp;
if (after_ret) {
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = nfsrv_nfs_false;
} else {
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED + NFSX_V3FATTR);
*tl++ = nfsrv_nfs_true;
fp = (struct nfs_fattr *)tl;
nfsm_srvfattr(nfsd, after_vap, fp);
}
*mbp = mb;
*bposp = bpos;
}
void
nfsm_srvfattr(struct nfsrv_descript *nfsd, struct vattr *vap,
struct nfs_fattr *fp)
{
fp->fa_nlink = txdr_unsigned(vap->va_nlink);
fp->fa_uid = txdr_unsigned(vap->va_uid);
fp->fa_gid = txdr_unsigned(vap->va_gid);
if (nfsd->nd_flag & ND_NFSV3) {
fp->fa_type = vtonfsv3_type(vap->va_type);
fp->fa_mode = vtonfsv3_mode(vap->va_mode);
txdr_hyper(vap->va_size, &fp->fa3_size);
txdr_hyper(vap->va_bytes, &fp->fa3_used);
fp->fa3_rdev.specdata1 = txdr_unsigned(major(vap->va_rdev));
fp->fa3_rdev.specdata2 = txdr_unsigned(minor(vap->va_rdev));
fp->fa3_fsid.nfsuquad[0] = 0;
fp->fa3_fsid.nfsuquad[1] = txdr_unsigned(vap->va_fsid);
fp->fa3_fileid.nfsuquad[0] = 0;
fp->fa3_fileid.nfsuquad[1] = txdr_unsigned(vap->va_fileid);
txdr_nfsv3time(&vap->va_atime, &fp->fa3_atime);
txdr_nfsv3time(&vap->va_mtime, &fp->fa3_mtime);
txdr_nfsv3time(&vap->va_ctime, &fp->fa3_ctime);
} else {
fp->fa_type = vtonfsv2_type(vap->va_type);
fp->fa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
fp->fa2_size = txdr_unsigned(vap->va_size);
fp->fa2_blocksize = txdr_unsigned(vap->va_blocksize);
if (vap->va_type == VFIFO)
fp->fa2_rdev = 0xffffffff;
else
fp->fa2_rdev = txdr_unsigned(vap->va_rdev);
fp->fa2_blocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE);
fp->fa2_fsid = txdr_unsigned(vap->va_fsid);
fp->fa2_fileid = txdr_unsigned(vap->va_fileid);
txdr_nfsv2time(&vap->va_atime, &fp->fa2_atime);
txdr_nfsv2time(&vap->va_mtime, &fp->fa2_mtime);
txdr_nfsv2time(&vap->va_ctime, &fp->fa2_ctime);
}
}
/*
* nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked)
* - look up fsid in mount list (if not found ret error)
* - get vp and export rights by calling VFS_FHTOVP()
* - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
*/
int
nfsrv_fhtovp(fhandle_t *fhp, int flags, struct vnode **vpp, int *vfslockedp,
struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct sockaddr *nam, int *rdonlyp)
{
struct mount *mp;
int i;
struct ucred *cred, *credanon;
int error, exflags;
#ifdef MNT_EXNORESPORT /* XXX needs mountd and /etc/exports help yet */
struct sockaddr_int *saddr;
#endif
int credflavor;
int vfslocked;
int numsecflavors, *secflavors;
int authsys;
int v3 = nfsd->nd_flag & ND_NFSV3;
int mountreq;
*vfslockedp = 0;
*vpp = NULL;
if (nfs_ispublicfh(fhp)) {
if (!nfs_pub.np_valid)
return (ESTALE);
fhp = &nfs_pub.np_handle;
}
mp = vfs_busyfs(&fhp->fh_fsid);
if (!mp)
return (ESTALE);
vfslocked = VFS_LOCK_GIANT(mp);
error = VFS_CHECKEXP(mp, nam, &exflags, &credanon,
&numsecflavors, &secflavors);
if (error) {
vfs_unbusy(mp);
goto out;
}
if (numsecflavors == 0) {
/*
* This can happen if the system is running with an
* old mountd that doesn't pass in a secflavor list.
*/
numsecflavors = 1;
authsys = AUTH_SYS;
secflavors = &authsys;
}
credflavor = nfsd->nd_credflavor;
for (i = 0; i < numsecflavors; i++) {
if (secflavors[i] == credflavor)
break;
}
if (i == numsecflavors) {
/*
* RFC 2623 section 2.3.2 - allow certain procedures
* used at NFS client mount time even if they have
* weak authentication.
*/
mountreq = FALSE;
if (v3) {
if (nfsd->nd_procnum == NFSPROC_FSINFO
|| nfsd->nd_procnum == NFSPROC_GETATTR)
mountreq = TRUE;
} else {
if (nfsd->nd_procnum == NFSPROC_FSSTAT
|| nfsd->nd_procnum == NFSPROC_GETATTR)
mountreq = TRUE;
}
if (!mountreq) {
error = NFSERR_AUTHERR | AUTH_TOOWEAK;
vfs_unbusy(mp);
goto out;
}
}
error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, vpp);
if (error) {
/* Make sure the server replies ESTALE to the client. */
error = ESTALE;
vfs_unbusy(mp);
goto out;
}
#ifdef MNT_EXNORESPORT
if (!(exflags & (MNT_EXNORESPORT|MNT_EXPUBLIC))) {
saddr = (struct sockaddr_in *)nam;
if ((saddr->sin_family == AF_INET ||
saddr->sin_family == AF_INET6) &&
/* same code for INET and INET6: sin*_port at same offet */
ntohs(saddr->sin_port) >= IPPORT_RESERVED) {
vput(*vpp);
*vpp = NULL;
error = NFSERR_AUTHERR | AUTH_TOOWEAK;
vfs_unbusy(mp);
goto out;
}
}
#endif
/*
* Check/setup credentials.
*/
cred = nfsd->nd_cr;
if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
cred->cr_uid = credanon->cr_uid;
crsetgroups(cred, credanon->cr_ngroups, credanon->cr_groups);
}
if (exflags & MNT_EXRDONLY)
*rdonlyp = 1;
else
*rdonlyp = 0;
if (!(flags & NFSRV_FLAG_BUSY))
vfs_unbusy(mp);
out:
if (credanon != NULL)
crfree(credanon);
if (error)
VFS_UNLOCK_GIANT(vfslocked);
else
*vfslockedp = vfslocked;
return (error);
}
/*
* WebNFS: check if a filehandle is a public filehandle. For v3, this
* means a length of 0, for v2 it means all zeroes. nfsm_srvmtofh has
* transformed this to all zeroes in both cases, so check for it.
*/
int
nfs_ispublicfh(fhandle_t *fhp)
{
char *cp = (char *)fhp;
int i;
NFSD_LOCK_DONTCARE();
for (i = 0; i < NFSX_V3FH; i++)
if (*cp++ != 0)
return (FALSE);
return (TRUE);
}
/*
* Map errnos to NFS error numbers. For Version 3 also filter out error
* numbers not specified for the associated procedure.
*/
int
nfsrv_errmap(struct nfsrv_descript *nd, int err)
{
const short *defaulterrp, *errp;
int e;
if (nd->nd_flag & ND_NFSV3) {
if (nd->nd_procnum <= NFSPROC_COMMIT) {
errp = defaulterrp = nfsrv_v3errmap[nd->nd_procnum];
while (*++errp) {
if (*errp == err)
return (err);
else if (*errp > err)
break;
}
return ((int)*defaulterrp);
} else
return (err & 0xffff);
}
e = 0;
if (err <= ELAST)
e = nfsrv_v2errmap[err - 1];
if (e != 0)
return (e);
return (NFSERR_IO);
}
/*
* Sort the group list in increasing numerical order.
* (Insertion sort by Chris Torek, who was grossed out by the bubble sort
* that used to be here.)
*/
void
nfsrvw_sort(gid_t *list, int num)
{
int i, j;
gid_t v;
/* Insertion sort. */
for (i = 1; i < num; i++) {
v = list[i];
/* find correct slot for value v, moving others up */
for (j = i; --j >= 0 && v < list[j];)
list[j + 1] = list[j];
list[j + 1] = v;
}
}
/*
* Helper functions for macros.
*/
void
nfsm_srvfhtom_xx(fhandle_t *f, int v3, struct mbuf **mb, caddr_t *bpos)
{
u_int32_t *tl;
if (v3) {
tl = nfsm_build_xx(NFSX_UNSIGNED + NFSX_V3FH, mb, bpos);
*tl++ = txdr_unsigned(NFSX_V3FH);
bcopy(f, tl, NFSX_V3FH);
} else {
tl = nfsm_build_xx(NFSX_V2FH, mb, bpos);
bcopy(f, tl, NFSX_V2FH);
}
}
void
nfsm_srvpostop_fh_xx(fhandle_t *f, struct mbuf **mb, caddr_t *bpos)
{
u_int32_t *tl;
tl = nfsm_build_xx(2 * NFSX_UNSIGNED + NFSX_V3FH, mb, bpos);
*tl++ = nfsrv_nfs_true;
*tl++ = txdr_unsigned(NFSX_V3FH);
bcopy(f, tl, NFSX_V3FH);
}
int
nfsm_srvstrsiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
*s = fxdr_unsigned(int32_t, *tl);
if (*s > m || *s <= 0)
return EBADRPC;
return 0;
}
int
nfsm_srvnamesiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
NFSD_LOCK_DONTCARE();
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
*s = fxdr_unsigned(int32_t, *tl);
if (*s > m)
return NFSERR_NAMETOL;
if (*s <= 0)
return EBADRPC;
return 0;
}
int
nfsm_srvnamesiz0_xx(int *s, int m, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
*s = fxdr_unsigned(int32_t, *tl);
if (*s > m)
return NFSERR_NAMETOL;
if (*s < 0)
return EBADRPC;
return 0;
}
void
nfsm_clget_xx(u_int32_t **tl, struct mbuf *mb, struct mbuf **mp,
char **bp, char **be, caddr_t bpos)
{
struct mbuf *nmp;
NFSD_UNLOCK_ASSERT();
if (*bp >= *be) {
if (*mp == mb)
(*mp)->m_len += *bp - bpos;
MGET(nmp, M_WAIT, MT_DATA);
MCLGET(nmp, M_WAIT);
nmp->m_len = NFSMSIZ(nmp);
(*mp)->m_next = nmp;
*mp = nmp;
*bp = mtod(*mp, caddr_t);
*be = *bp + (*mp)->m_len;
}
*tl = (u_int32_t *)*bp;
}
int
nfsm_srvmtofh_xx(fhandle_t *f, int v3, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
int fhlen;
if (v3) {
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
fhlen = fxdr_unsigned(int, *tl);
if (fhlen != 0 && fhlen != NFSX_V3FH)
return EBADRPC;
} else {
fhlen = NFSX_V2FH;
}
if (fhlen != 0) {
tl = nfsm_dissect_xx_nonblock(fhlen, md, dpos);
if (tl == NULL)
return EBADRPC;
bcopy((caddr_t)tl, (caddr_t)(f), fhlen);
} else {
bzero((caddr_t)(f), NFSX_V3FH);
}
return 0;
}
int
nfsm_srvsattr_xx(struct vattr *a, struct mbuf **md, caddr_t *dpos)
{
u_int32_t *tl;
int toclient = 0;
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
if (*tl == nfsrv_nfs_true) {
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
(a)->va_mode = nfstov_mode(*tl);
}
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
if (*tl == nfsrv_nfs_true) {
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
(a)->va_uid = fxdr_unsigned(uid_t, *tl);
}
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
if (*tl == nfsrv_nfs_true) {
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
(a)->va_gid = fxdr_unsigned(gid_t, *tl);
}
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
if (*tl == nfsrv_nfs_true) {
tl = nfsm_dissect_xx_nonblock(2 * NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
(a)->va_size = fxdr_hyper(tl);
}
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
switch (fxdr_unsigned(int, *tl)) {
case NFSV3SATTRTIME_TOCLIENT:
tl = nfsm_dissect_xx_nonblock(2 * NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
fxdr_nfsv3time(tl, &(a)->va_atime);
toclient = 1;
break;
case NFSV3SATTRTIME_TOSERVER:
getnanotime(&(a)->va_atime);
a->va_vaflags |= VA_UTIMES_NULL;
break;
}
tl = nfsm_dissect_xx_nonblock(NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
switch (fxdr_unsigned(int, *tl)) {
case NFSV3SATTRTIME_TOCLIENT:
tl = nfsm_dissect_xx_nonblock(2 * NFSX_UNSIGNED, md, dpos);
if (tl == NULL)
return EBADRPC;
fxdr_nfsv3time(tl, &(a)->va_mtime);
a->va_vaflags &= ~VA_UTIMES_NULL;
break;
case NFSV3SATTRTIME_TOSERVER:
getnanotime(&(a)->va_mtime);
if (toclient == 0)
a->va_vaflags |= VA_UTIMES_NULL;
break;
}
return 0;
}
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