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freebsd-skq/sys/nfs/nfs_common.c
dillon 08e8d78b50 Fix a number of server-side issues related to aborting badly formed 
NFS packets, mainly initializing structure pointers to NULL which
    are conditionally freed prior to return.

PR:		kern/15249
Submitted by:	Ian Dowse <iedowse@maths.tcd.ie>
1999-12-12 07:06:39 +00:00

2273 lines
52 KiB
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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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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
* $FreeBSD$
*/
/*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.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/socket.h>
#include <sys/stat.h>
#include <sys/malloc.h>
#include <sys/sysent.h>
#include <sys/syscall.h>
#include <sys/conf.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_zone.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsmount.h>
#include <nfs/nqnfs.h>
#include <nfs/nfsrtt.h>
#include <netinet/in.h>
#ifdef ISO
#include <netiso/iso.h>
#endif
/*
* 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 nfs_xdrneg1;
u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr,
rpc_mismatch, rpc_auth_unix, rpc_msgaccepted,
rpc_auth_kerb;
u_int32_t nfs_prog, nqnfs_prog, nfs_true, nfs_false;
/* And other global data */
static u_int32_t nfs_xid = 0;
static enum vtype nv2tov_type[8]= {
VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON
};
enum vtype nv3tov_type[8]= {
VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO
};
int nfs_ticks;
int nfs_pbuf_freecnt = -1; /* start out unlimited */
struct nfs_reqq nfs_reqq;
struct nfssvc_sockhead nfssvc_sockhead;
int nfssvc_sockhead_flag;
struct nfsd_head nfsd_head;
int nfsd_head_flag;
struct nfs_bufq nfs_bufq;
struct nqtimerhead nqtimerhead;
struct nqfhhashhead *nqfhhashtbl;
u_long nqfhhash;
static void (*nfs_prev_lease_updatetime) __P((int));
static int nfs_prev_nfssvc_sy_narg;
static sy_call_t *nfs_prev_nfssvc_sy_call;
#ifndef NFS_NOSERVER
static vop_t *nfs_prev_vop_lease_check;
static int nfs_prev_getfh_sy_narg;
static sy_call_t *nfs_prev_getfh_sy_call;
/*
* Mapping of old NFS Version 2 RPC numbers to generic numbers.
*/
int 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,
NFSPROC_NOOP,
NFSPROC_NOOP,
NFSPROC_NOOP
};
#endif /* NFS_NOSERVER */
/*
* and the reverse mapping from generic to Version 2 procedure numbers
*/
int nfsv2_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,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
NFSV2PROC_NOOP,
};
#ifndef NFS_NOSERVER
/*
* Maps errno values to nfs error numbers.
* Use NFSERR_IO as the catch all for ones not specifically defined in
* RFC 1094.
*/
static u_char nfsrv_v2errmap[ELAST] = {
NFSERR_PERM, NFSERR_NOENT, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_NXIO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_ACCES, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_EXIST, NFSERR_IO, NFSERR_NODEV, NFSERR_NOTDIR,
NFSERR_ISDIR, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_FBIG, NFSERR_NOSPC, NFSERR_IO, NFSERR_ROFS,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_NAMETOL, NFSERR_IO, NFSERR_IO,
NFSERR_NOTEMPTY, NFSERR_IO, NFSERR_IO, NFSERR_DQUOT, NFSERR_STALE,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
NFSERR_IO /* << Last is 86 */
};
/*
* 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 short nfsv3err_null[] = {
0,
0,
};
static short nfsv3err_getattr[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static 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 short nfsv3err_lookup[] = {
NFSERR_IO,
NFSERR_NOENT,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_NOTDIR,
NFSERR_NAMETOL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static short nfsv3err_access[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static short nfsv3err_readlink[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_INVAL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_NOTSUPP,
NFSERR_SERVERFAULT,
0,
};
static short nfsv3err_read[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_NXIO,
NFSERR_ACCES,
NFSERR_INVAL,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static 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 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 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 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 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 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 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 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 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 short nfsv3err_readdir[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_ACCES,
NFSERR_NOTDIR,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_BAD_COOKIE,
NFSERR_TOOSMALL,
NFSERR_SERVERFAULT,
0,
};
static 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 short nfsv3err_fsstat[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static short nfsv3err_fsinfo[] = {
NFSERR_STALE,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static short nfsv3err_pathconf[] = {
NFSERR_STALE,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static short nfsv3err_commit[] = {
NFSERR_IO,
NFSERR_IO,
NFSERR_STALE,
NFSERR_BADHANDLE,
NFSERR_SERVERFAULT,
0,
};
static 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,
};
#endif /* NFS_NOSERVER */
extern struct nfsrtt nfsrtt;
extern time_t nqnfsstarttime;
extern int nqsrv_clockskew;
extern int nqsrv_writeslack;
extern int nqsrv_maxlease;
extern struct nfsstats nfsstats;
extern int nqnfs_piggy[NFS_NPROCS];
extern nfstype nfsv2_type[9];
extern nfstype nfsv3_type[9];
extern struct nfsnodehashhead *nfsnodehashtbl;
extern u_long nfsnodehash;
struct getfh_args;
extern int getfh(struct proc *, struct getfh_args *, int *);
struct nfssvc_args;
extern int nfssvc(struct proc *, struct nfssvc_args *, int *);
LIST_HEAD(nfsnodehashhead, nfsnode);
int nfs_webnamei __P((struct nameidata *, struct vnode *, struct proc *));
u_quad_t
nfs_curusec()
{
struct timeval tv;
getmicrotime(&tv);
return ((u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec);
}
/*
* Create the header for an rpc request packet
* The hsiz is the size of the rest of the nfs request header.
* (just used to decide if a cluster is a good idea)
*/
struct mbuf *
nfsm_reqh(vp, procid, hsiz, bposp)
struct vnode *vp;
u_long procid;
int hsiz;
caddr_t *bposp;
{
register struct mbuf *mb;
register u_int32_t *tl;
register caddr_t bpos;
struct mbuf *mb2;
struct nfsmount *nmp;
int nqflag;
MGET(mb, M_WAIT, MT_DATA);
if (hsiz >= MINCLSIZE)
MCLGET(mb, M_WAIT);
mb->m_len = 0;
bpos = mtod(mb, caddr_t);
/*
* For NQNFS, add lease request.
*/
if (vp) {
nmp = VFSTONFS(vp->v_mount);
if (nmp->nm_flag & NFSMNT_NQNFS) {
nqflag = NQNFS_NEEDLEASE(vp, procid);
if (nqflag) {
nfsm_build(tl, u_int32_t *, 2*NFSX_UNSIGNED);
*tl++ = txdr_unsigned(nqflag);
*tl = txdr_unsigned(nmp->nm_leaseterm);
} else {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = 0;
}
}
}
/* Finally, return values */
*bposp = bpos;
return (mb);
}
/*
* Build the RPC header and fill in the authorization info.
* The authorization string argument is only used when the credentials
* come from outside of the kernel.
* Returns the head of the mbuf list.
*/
struct mbuf *
nfsm_rpchead(cr, nmflag, procid, auth_type, auth_len, auth_str, verf_len,
verf_str, mrest, mrest_len, mbp, xidp)
register struct ucred *cr;
int nmflag;
int procid;
int auth_type;
int auth_len;
char *auth_str;
int verf_len;
char *verf_str;
struct mbuf *mrest;
int mrest_len;
struct mbuf **mbp;
u_int32_t *xidp;
{
register struct mbuf *mb;
register u_int32_t *tl;
register caddr_t bpos;
register int i;
struct mbuf *mreq, *mb2;
int siz, grpsiz, authsiz;
authsiz = nfsm_rndup(auth_len);
MGETHDR(mb, M_WAIT, MT_DATA);
if ((authsiz + 10 * NFSX_UNSIGNED) >= MINCLSIZE) {
MCLGET(mb, M_WAIT);
} else if ((authsiz + 10 * NFSX_UNSIGNED) < MHLEN) {
MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED);
} else {
MH_ALIGN(mb, 8 * NFSX_UNSIGNED);
}
mb->m_len = 0;
mreq = mb;
bpos = mtod(mb, caddr_t);
/*
* First the RPC header.
*/
nfsm_build(tl, u_int32_t *, 8 * NFSX_UNSIGNED);
/* Get a pretty random xid to start with */
if (!nfs_xid)
nfs_xid = random();
/*
* Skip zero xid if it should ever happen.
*/
if (++nfs_xid == 0)
nfs_xid++;
*tl++ = *xidp = txdr_unsigned(nfs_xid);
*tl++ = rpc_call;
*tl++ = rpc_vers;
if (nmflag & NFSMNT_NQNFS) {
*tl++ = txdr_unsigned(NQNFS_PROG);
*tl++ = txdr_unsigned(NQNFS_VER3);
} else {
*tl++ = txdr_unsigned(NFS_PROG);
if (nmflag & NFSMNT_NFSV3)
*tl++ = txdr_unsigned(NFS_VER3);
else
*tl++ = txdr_unsigned(NFS_VER2);
}
if (nmflag & NFSMNT_NFSV3)
*tl++ = txdr_unsigned(procid);
else
*tl++ = txdr_unsigned(nfsv2_procid[procid]);
/*
* And then the authorization cred.
*/
*tl++ = txdr_unsigned(auth_type);
*tl = txdr_unsigned(authsiz);
switch (auth_type) {
case RPCAUTH_UNIX:
nfsm_build(tl, u_int32_t *, auth_len);
*tl++ = 0; /* stamp ?? */
*tl++ = 0; /* NULL hostname */
*tl++ = txdr_unsigned(cr->cr_uid);
*tl++ = txdr_unsigned(cr->cr_groups[0]);
grpsiz = (auth_len >> 2) - 5;
*tl++ = txdr_unsigned(grpsiz);
for (i = 1; i <= grpsiz; i++)
*tl++ = txdr_unsigned(cr->cr_groups[i]);
break;
case RPCAUTH_KERB4:
siz = auth_len;
while (siz > 0) {
if (M_TRAILINGSPACE(mb) == 0) {
MGET(mb2, M_WAIT, MT_DATA);
if (siz >= MINCLSIZE)
MCLGET(mb2, M_WAIT);
mb->m_next = mb2;
mb = mb2;
mb->m_len = 0;
bpos = mtod(mb, caddr_t);
}
i = min(siz, M_TRAILINGSPACE(mb));
bcopy(auth_str, bpos, i);
mb->m_len += i;
auth_str += i;
bpos += i;
siz -= i;
}
if ((siz = (nfsm_rndup(auth_len) - auth_len)) > 0) {
for (i = 0; i < siz; i++)
*bpos++ = '\0';
mb->m_len += siz;
}
break;
};
/*
* And the verifier...
*/
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
if (verf_str) {
*tl++ = txdr_unsigned(RPCAUTH_KERB4);
*tl = txdr_unsigned(verf_len);
siz = verf_len;
while (siz > 0) {
if (M_TRAILINGSPACE(mb) == 0) {
MGET(mb2, M_WAIT, MT_DATA);
if (siz >= MINCLSIZE)
MCLGET(mb2, M_WAIT);
mb->m_next = mb2;
mb = mb2;
mb->m_len = 0;
bpos = mtod(mb, caddr_t);
}
i = min(siz, M_TRAILINGSPACE(mb));
bcopy(verf_str, bpos, i);
mb->m_len += i;
verf_str += i;
bpos += i;
siz -= i;
}
if ((siz = (nfsm_rndup(verf_len) - verf_len)) > 0) {
for (i = 0; i < siz; i++)
*bpos++ = '\0';
mb->m_len += siz;
}
} else {
*tl++ = txdr_unsigned(RPCAUTH_NULL);
*tl = 0;
}
mb->m_next = mrest;
mreq->m_pkthdr.len = authsiz + 10 * NFSX_UNSIGNED + mrest_len;
mreq->m_pkthdr.rcvif = (struct ifnet *)0;
*mbp = mb;
return (mreq);
}
/*
* copies mbuf chain to the uio scatter/gather list
*/
int
nfsm_mbuftouio(mrep, uiop, siz, dpos)
struct mbuf **mrep;
register struct uio *uiop;
int siz;
caddr_t *dpos;
{
register char *mbufcp, *uiocp;
register int xfer, left, len;
register struct mbuf *mp;
long uiosiz, rem;
int error = 0;
mp = *mrep;
mbufcp = *dpos;
len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
rem = nfsm_rndup(siz)-siz;
while (siz > 0) {
if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
return (EFBIG);
left = uiop->uio_iov->iov_len;
uiocp = uiop->uio_iov->iov_base;
if (left > siz)
left = siz;
uiosiz = left;
while (left > 0) {
while (len == 0) {
mp = mp->m_next;
if (mp == NULL)
return (EBADRPC);
mbufcp = mtod(mp, caddr_t);
len = mp->m_len;
}
xfer = (left > len) ? len : left;
#ifdef notdef
/* Not Yet.. */
if (uiop->uio_iov->iov_op != NULL)
(*(uiop->uio_iov->iov_op))
(mbufcp, uiocp, xfer);
else
#endif
if (uiop->uio_segflg == UIO_SYSSPACE)
bcopy(mbufcp, uiocp, xfer);
else
copyout(mbufcp, uiocp, xfer);
left -= xfer;
len -= xfer;
mbufcp += xfer;
uiocp += xfer;
uiop->uio_offset += xfer;
uiop->uio_resid -= xfer;
}
if (uiop->uio_iov->iov_len <= siz) {
uiop->uio_iovcnt--;
uiop->uio_iov++;
} else {
uiop->uio_iov->iov_base += uiosiz;
uiop->uio_iov->iov_len -= uiosiz;
}
siz -= uiosiz;
}
*dpos = mbufcp;
*mrep = mp;
if (rem > 0) {
if (len < rem)
error = nfs_adv(mrep, dpos, rem, len);
else
*dpos += rem;
}
return (error);
}
/*
* copies a uio scatter/gather list to an mbuf chain.
* NOTE: can ony handle iovcnt == 1
*/
int
nfsm_uiotombuf(uiop, mq, siz, bpos)
register struct uio *uiop;
struct mbuf **mq;
int siz;
caddr_t *bpos;
{
register char *uiocp;
register struct mbuf *mp, *mp2;
register int xfer, left, mlen;
int uiosiz, clflg, rem;
char *cp;
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfsm_uiotombuf: iovcnt != 1");
#endif
if (siz > MLEN) /* or should it >= MCLBYTES ?? */
clflg = 1;
else
clflg = 0;
rem = nfsm_rndup(siz)-siz;
mp = mp2 = *mq;
while (siz > 0) {
left = uiop->uio_iov->iov_len;
uiocp = uiop->uio_iov->iov_base;
if (left > siz)
left = siz;
uiosiz = left;
while (left > 0) {
mlen = M_TRAILINGSPACE(mp);
if (mlen == 0) {
MGET(mp, M_WAIT, MT_DATA);
if (clflg)
MCLGET(mp, M_WAIT);
mp->m_len = 0;
mp2->m_next = mp;
mp2 = mp;
mlen = M_TRAILINGSPACE(mp);
}
xfer = (left > mlen) ? mlen : left;
#ifdef notdef
/* Not Yet.. */
if (uiop->uio_iov->iov_op != NULL)
(*(uiop->uio_iov->iov_op))
(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
#endif
if (uiop->uio_segflg == UIO_SYSSPACE)
bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
mp->m_len += xfer;
left -= xfer;
uiocp += xfer;
uiop->uio_offset += xfer;
uiop->uio_resid -= xfer;
}
uiop->uio_iov->iov_base += uiosiz;
uiop->uio_iov->iov_len -= uiosiz;
siz -= uiosiz;
}
if (rem > 0) {
if (rem > M_TRAILINGSPACE(mp)) {
MGET(mp, M_WAIT, MT_DATA);
mp->m_len = 0;
mp2->m_next = mp;
}
cp = mtod(mp, caddr_t)+mp->m_len;
for (left = 0; left < rem; left++)
*cp++ = '\0';
mp->m_len += rem;
*bpos = cp;
} else
*bpos = mtod(mp, caddr_t)+mp->m_len;
*mq = mp;
return (0);
}
/*
* Help break down an mbuf chain by setting the first siz bytes contiguous
* pointed to by returned val.
* This is used by the macros nfsm_dissect and nfsm_dissecton for tough
* cases. (The macros use the vars. dpos and dpos2)
*/
int
nfsm_disct(mdp, dposp, siz, left, cp2)
struct mbuf **mdp;
caddr_t *dposp;
int siz;
int left;
caddr_t *cp2;
{
register struct mbuf *mp, *mp2;
register int siz2, xfer;
register caddr_t p;
mp = *mdp;
while (left == 0) {
*mdp = mp = mp->m_next;
if (mp == NULL)
return (EBADRPC);
left = mp->m_len;
*dposp = mtod(mp, caddr_t);
}
if (left >= siz) {
*cp2 = *dposp;
*dposp += siz;
} else if (mp->m_next == NULL) {
return (EBADRPC);
} else if (siz > MHLEN) {
panic("nfs S too big");
} else {
MGET(mp2, M_WAIT, MT_DATA);
mp2->m_next = mp->m_next;
mp->m_next = mp2;
mp->m_len -= left;
mp = mp2;
*cp2 = p = mtod(mp, caddr_t);
bcopy(*dposp, p, left); /* Copy what was left */
siz2 = siz-left;
p += left;
mp2 = mp->m_next;
/* Loop around copying up the siz2 bytes */
while (siz2 > 0) {
if (mp2 == NULL)
return (EBADRPC);
xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
if (xfer > 0) {
bcopy(mtod(mp2, caddr_t), p, xfer);
NFSMADV(mp2, xfer);
mp2->m_len -= xfer;
p += xfer;
siz2 -= xfer;
}
if (siz2 > 0)
mp2 = mp2->m_next;
}
mp->m_len = siz;
*mdp = mp2;
*dposp = mtod(mp2, caddr_t);
}
return (0);
}
/*
* Advance the position in the mbuf chain.
*/
int
nfs_adv(mdp, dposp, offs, left)
struct mbuf **mdp;
caddr_t *dposp;
int offs;
int left;
{
register struct mbuf *m;
register int s;
m = *mdp;
s = left;
while (s < offs) {
offs -= s;
m = m->m_next;
if (m == NULL)
return (EBADRPC);
s = m->m_len;
}
*mdp = m;
*dposp = mtod(m, caddr_t)+offs;
return (0);
}
/*
* Copy a string into mbufs for the hard cases...
*/
int
nfsm_strtmbuf(mb, bpos, cp, siz)
struct mbuf **mb;
char **bpos;
const char *cp;
long siz;
{
register struct mbuf *m1 = NULL, *m2;
long left, xfer, len, tlen;
u_int32_t *tl;
int putsize;
putsize = 1;
m2 = *mb;
left = M_TRAILINGSPACE(m2);
if (left > 0) {
tl = ((u_int32_t *)(*bpos));
*tl++ = txdr_unsigned(siz);
putsize = 0;
left -= NFSX_UNSIGNED;
m2->m_len += NFSX_UNSIGNED;
if (left > 0) {
bcopy(cp, (caddr_t) tl, left);
siz -= left;
cp += left;
m2->m_len += left;
left = 0;
}
}
/* Loop around adding mbufs */
while (siz > 0) {
MGET(m1, M_WAIT, MT_DATA);
if (siz > MLEN)
MCLGET(m1, M_WAIT);
m1->m_len = NFSMSIZ(m1);
m2->m_next = m1;
m2 = m1;
tl = mtod(m1, u_int32_t *);
tlen = 0;
if (putsize) {
*tl++ = txdr_unsigned(siz);
m1->m_len -= NFSX_UNSIGNED;
tlen = NFSX_UNSIGNED;
putsize = 0;
}
if (siz < m1->m_len) {
len = nfsm_rndup(siz);
xfer = siz;
if (xfer < len)
*(tl+(xfer>>2)) = 0;
} else {
xfer = len = m1->m_len;
}
bcopy(cp, (caddr_t) tl, xfer);
m1->m_len = len+tlen;
siz -= xfer;
cp += xfer;
}
*mb = m1;
*bpos = mtod(m1, caddr_t)+m1->m_len;
return (0);
}
/*
* Called once to initialize data structures...
*/
int
nfs_init(vfsp)
struct vfsconf *vfsp;
{
register int i;
nfsmount_zone = zinit("NFSMOUNT", sizeof(struct nfsmount), 0, 0, 1);
/*
* Check to see if major data structures haven't bloated.
*/
if (sizeof (struct nfssvc_sock) > NFS_SVCALLOC) {
printf("struct nfssvc_sock bloated (> %dbytes)\n",NFS_SVCALLOC);
printf("Try reducing NFS_UIDHASHSIZ\n");
}
if (sizeof (struct nfsuid) > NFS_UIDALLOC) {
printf("struct nfsuid bloated (> %dbytes)\n",NFS_UIDALLOC);
printf("Try unionizing the nu_nickname and nu_flag fields\n");
}
nfs_mount_type = vfsp->vfc_typenum;
nfsrtt.pos = 0;
rpc_vers = txdr_unsigned(RPC_VER2);
rpc_call = txdr_unsigned(RPC_CALL);
rpc_reply = txdr_unsigned(RPC_REPLY);
rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
rpc_autherr = txdr_unsigned(RPC_AUTHERR);
rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
rpc_auth_kerb = txdr_unsigned(RPCAUTH_KERB4);
nfs_prog = txdr_unsigned(NFS_PROG);
nqnfs_prog = txdr_unsigned(NQNFS_PROG);
nfs_true = txdr_unsigned(TRUE);
nfs_false = txdr_unsigned(FALSE);
nfs_xdrneg1 = txdr_unsigned(-1);
nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
if (nfs_ticks < 1)
nfs_ticks = 1;
/* Ensure async daemons disabled */
for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
nfs_iodwant[i] = (struct proc *)0;
nfs_iodmount[i] = (struct nfsmount *)0;
}
nfs_nhinit(); /* Init the nfsnode table */
#ifndef NFS_NOSERVER
nfsrv_init(0); /* Init server data structures */
nfsrv_initcache(); /* Init the server request cache */
#endif
/*
* Initialize the nqnfs server stuff.
*/
if (nqnfsstarttime == 0) {
nqnfsstarttime = boottime.tv_sec + nqsrv_maxlease
+ nqsrv_clockskew + nqsrv_writeslack;
NQLOADNOVRAM(nqnfsstarttime);
CIRCLEQ_INIT(&nqtimerhead);
nqfhhashtbl = hashinit(NQLCHSZ, M_NQLEASE, &nqfhhash);
}
/*
* Initialize reply list and start timer
*/
TAILQ_INIT(&nfs_reqq);
nfs_timer(0);
/*
* Set up lease_check and lease_updatetime so that other parts
* of the system can call us, if we are loadable.
*/
#ifndef NFS_NOSERVER
nfs_prev_vop_lease_check = default_vnodeop_p[VOFFSET(vop_lease)];
default_vnodeop_p[VOFFSET(vop_lease)] = (vop_t *)nqnfs_vop_lease_check;
#endif
nfs_prev_lease_updatetime = lease_updatetime;
lease_updatetime = nfs_lease_updatetime;
nfs_prev_nfssvc_sy_narg = sysent[SYS_nfssvc].sy_narg;
sysent[SYS_nfssvc].sy_narg = 2;
nfs_prev_nfssvc_sy_call = sysent[SYS_nfssvc].sy_call;
sysent[SYS_nfssvc].sy_call = (sy_call_t *)nfssvc;
#ifndef NFS_NOSERVER
nfs_prev_getfh_sy_narg = sysent[SYS_getfh].sy_narg;
sysent[SYS_getfh].sy_narg = 2;
nfs_prev_getfh_sy_call = sysent[SYS_getfh].sy_call;
sysent[SYS_getfh].sy_call = (sy_call_t *)getfh;
#endif
nfs_pbuf_freecnt = nswbuf / 2 + 1;
return (0);
}
int
nfs_uninit(vfsp)
struct vfsconf *vfsp;
{
untimeout(nfs_timer, (void *)NULL, nfs_timer_handle);
nfs_mount_type = -1;
#ifndef NFS_NOSERVER
default_vnodeop_p[VOFFSET(vop_lease)] = nfs_prev_vop_lease_check;
#endif
lease_updatetime = nfs_prev_lease_updatetime;
sysent[SYS_nfssvc].sy_narg = nfs_prev_nfssvc_sy_narg;
sysent[SYS_nfssvc].sy_call = nfs_prev_nfssvc_sy_call;
#ifndef NFS_NOSERVER
sysent[SYS_getfh].sy_narg = nfs_prev_getfh_sy_narg;
sysent[SYS_getfh].sy_call = nfs_prev_getfh_sy_call;
#endif
return (0);
}
/*
* Attribute cache routines.
* nfs_loadattrcache() - loads or updates the cache contents from attributes
* that are on the mbuf list
* nfs_getattrcache() - returns valid attributes if found in cache, returns
* error otherwise
*/
/*
* Load the attribute cache (that lives in the nfsnode entry) with
* the values on the mbuf list and
* Iff vap not NULL
* copy the attributes to *vaper
*/
int
nfs_loadattrcache(vpp, mdp, dposp, vaper)
struct vnode **vpp;
struct mbuf **mdp;
caddr_t *dposp;
struct vattr *vaper;
{
register struct vnode *vp = *vpp;
register struct vattr *vap;
register struct nfs_fattr *fp;
register struct nfsnode *np;
register int32_t t1;
caddr_t cp2;
int error = 0, rdev;
struct mbuf *md;
enum vtype vtyp;
u_short vmode;
struct timespec mtime;
int v3 = NFS_ISV3(vp);
md = *mdp;
t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
if ((error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2)) != 0)
return (error);
fp = (struct nfs_fattr *)cp2;
if (v3) {
vtyp = nfsv3tov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
rdev = makeudev(fxdr_unsigned(int, fp->fa3_rdev.specdata1),
fxdr_unsigned(int, fp->fa3_rdev.specdata2));
fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
} else {
vtyp = nfsv2tov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
/*
* XXX
*
* The duplicate information returned in fa_type and fa_mode
* is an ambiguity in the NFS version 2 protocol.
*
* VREG should be taken literally as a regular file. If a
* server intents to return some type information differently
* in the upper bits of the mode field (e.g. for sockets, or
* FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we
* leave the examination of the mode bits even in the VREG
* case to avoid breakage for bogus servers, but we make sure
* that there are actually type bits set in the upper part of
* fa_mode (and failing that, trust the va_type field).
*
* NFSv3 cleared the issue, and requires fa_mode to not
* contain any type information (while also introduing sockets
* and FIFOs for fa_type).
*/
if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
vtyp = IFTOVT(vmode);
rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
/*
* Really ugly NFSv2 kludge.
*/
if (vtyp == VCHR && rdev == 0xffffffff)
vtyp = VFIFO;
}
/*
* If v_type == VNON it is a new node, so fill in the v_type,
* n_mtime fields. Check to see if it represents a special
* device, and if so, check for a possible alias. Once the
* correct vnode has been obtained, fill in the rest of the
* information.
*/
np = VTONFS(vp);
if (vp->v_type != vtyp) {
vp->v_type = vtyp;
if (vp->v_type == VFIFO) {
vp->v_op = fifo_nfsv2nodeop_p;
}
if (vp->v_type == VCHR || vp->v_type == VBLK) {
vp->v_op = spec_nfsv2nodeop_p;
addaliasu(vp, rdev);
}
np->n_mtime = mtime.tv_sec;
}
vap = &np->n_vattr;
vap->va_type = vtyp;
vap->va_mode = (vmode & 07777);
vap->va_rdev = rdev;
vap->va_mtime = mtime;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
if (v3) {
vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
vap->va_size = fxdr_hyper(&fp->fa3_size);
vap->va_blocksize = NFS_FABLKSIZE;
vap->va_bytes = fxdr_hyper(&fp->fa3_used);
vap->va_fileid = fxdr_unsigned(int32_t,
fp->fa3_fileid.nfsuquad[1]);
fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
vap->va_flags = 0;
vap->va_filerev = 0;
} else {
vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
* NFS_FABLKSIZE;
vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
vap->va_flags = 0;
vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
fp->fa2_ctime.nfsv2_sec);
vap->va_ctime.tv_nsec = 0;
vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
vap->va_filerev = 0;
}
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (np->n_flag & NMODIFIED) {
if (vap->va_size < np->n_size)
vap->va_size = np->n_size;
else
np->n_size = vap->va_size;
} else {
np->n_size = vap->va_size;
}
vnode_pager_setsize(vp, np->n_size);
} else {
np->n_size = vap->va_size;
}
}
np->n_attrstamp = time_second;
if (vaper != NULL) {
bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
if (np->n_flag & NCHG) {
if (np->n_flag & NACC)
vaper->va_atime = np->n_atim;
if (np->n_flag & NUPD)
vaper->va_mtime = np->n_mtim;
}
}
return (0);
}
#ifdef NFS_ACDEBUG
#include <sys/sysctl.h>
SYSCTL_DECL(_vfs_nfs);
static int nfs_acdebug;
SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
#endif
/*
* Check the time stamp
* If the cache is valid, copy contents to *vap and return 0
* otherwise return an error
*/
int
nfs_getattrcache(vp, vaper)
register struct vnode *vp;
struct vattr *vaper;
{
register struct nfsnode *np;
register struct vattr *vap;
struct nfsmount *nmp;
int timeo;
np = VTONFS(vp);
vap = &np->n_vattr;
nmp = VFSTONFS(vp->v_mount);
/* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
timeo = (time_second - np->n_mtime) / 10;
#ifdef NFS_ACDEBUG
if (nfs_acdebug>1)
printf("nfs_getattrcache: initial timeo = %d\n", timeo);
#endif
if (vap->va_type == VDIR) {
if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
timeo = nmp->nm_acdirmin;
else if (timeo > nmp->nm_acdirmax)
timeo = nmp->nm_acdirmax;
} else {
if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
timeo = nmp->nm_acregmin;
else if (timeo > nmp->nm_acregmax)
timeo = nmp->nm_acregmax;
}
#ifdef NFS_ACDEBUG
if (nfs_acdebug > 2)
printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
nmp->nm_acregmin, nmp->nm_acregmax,
nmp->nm_acdirmin, nmp->nm_acdirmax);
if (nfs_acdebug)
printf("nfs_getattrcache: age = %d; final timeo = %d\n",
(time_second - np->n_attrstamp), timeo);
#endif
if ((time_second - np->n_attrstamp) >= timeo) {
nfsstats.attrcache_misses++;
return (ENOENT);
}
nfsstats.attrcache_hits++;
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (np->n_flag & NMODIFIED) {
if (vap->va_size < np->n_size)
vap->va_size = np->n_size;
else
np->n_size = vap->va_size;
} else {
np->n_size = vap->va_size;
}
vnode_pager_setsize(vp, np->n_size);
} else {
np->n_size = vap->va_size;
}
}
bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
if (np->n_flag & NCHG) {
if (np->n_flag & NACC)
vaper->va_atime = np->n_atim;
if (np->n_flag & NUPD)
vaper->va_mtime = np->n_mtim;
}
return (0);
}
#ifndef NFS_NOSERVER
/*
* 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(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
register struct nameidata *ndp;
fhandle_t *fhp;
int len;
struct nfssvc_sock *slp;
struct sockaddr *nam;
struct mbuf **mdp;
caddr_t *dposp;
struct vnode **retdirp;
struct proc *p;
int kerbflag, pubflag;
{
register int i, rem;
register struct mbuf *md;
register char *fromcp, *tocp, *cp;
struct iovec aiov;
struct uio auio;
struct vnode *dp;
int error, rdonly, linklen;
struct componentname *cnp = &ndp->ni_cnd;
*retdirp = (struct vnode *)0;
cnp->cn_pnbuf = zalloc(namei_zone);
/*
* 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;
}
/*
* Extract and set starting directory.
*/
error = nfsrv_fhtovp(fhp, FALSE, &dp, ndp->ni_cnd.cn_cred, slp,
nam, &rdonly, kerbflag, pubflag);
if (error)
goto out;
if (dp->v_type != VDIR) {
vrele(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 (pubflag) {
/*
* Oh joy. For WebNFS, handle those pesky '%' escapes,
* and the 'native path' indicator.
*/
cp = zalloc(namei_zone);
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;
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;
zfree(namei_zone, cp);
goto out;
}
} else
*tocp++ = *fromcp++;
}
*tocp = '\0';
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] == '/')
dp = rootvnode;
} else {
cnp->cn_flags |= NOCROSSMOUNT;
}
/*
* Initialize for scan, set ni_startdir and bump ref on dp again
* becuase lookup() will dereference ni_startdir.
*/
cnp->cn_proc = p;
VREF(dp);
ndp->ni_startdir = dp;
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.
* Note: zfree is safe because error is 0, so we will
* not zfree it again when we break.
*/
if ((cnp->cn_flags & ISSYMLINK) == 0) {
nfsrv_object_create(ndp->ni_vp);
if (cnp->cn_flags & (SAVENAME | SAVESTART))
cnp->cn_flags |= HASBUF;
else
zfree(namei_zone, cnp->cn_pnbuf);
break;
}
/*
* Validate symlink
*/
if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
VOP_UNLOCK(ndp->ni_dvp, 0, p);
if (!pubflag) {
error = EINVAL;
goto badlink2;
}
if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
error = ELOOP;
goto badlink2;
}
if (ndp->ni_pathlen > 1)
cp = zalloc(namei_zone);
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_procp = (struct proc *)0;
auio.uio_resid = MAXPATHLEN;
error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
if (error) {
badlink1:
if (ndp->ni_pathlen > 1)
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) {
bcopy(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
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;
}
/*
* 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) {
zfree(namei_zone, cnp->cn_pnbuf);
ndp->ni_vp = NULL;
ndp->ni_dvp = NULL;
ndp->ni_startdir = NULL;
cnp->cn_flags &= ~HASBUF;
} else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
ndp->ni_dvp = NULL;
}
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(mp, len, nul)
struct mbuf *mp;
register int len;
int nul;
{
register struct mbuf *m;
register int count, i;
register 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 == (struct mbuf *)0)
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';
}
break;
}
count -= m->m_len;
}
for (m = m->m_next;m;m = m->m_next)
m->m_len = 0;
}
/*
* Make these functions instead of macros, so that the kernel text size
* doesn't get too big...
*/
void
nfsm_srvwcc(nfsd, before_ret, before_vap, after_ret, after_vap, mbp, bposp)
struct nfsrv_descript *nfsd;
int before_ret;
register struct vattr *before_vap;
int after_ret;
struct vattr *after_vap;
struct mbuf **mbp;
char **bposp;
{
register struct mbuf *mb = *mbp, *mb2;
register char *bpos = *bposp;
register u_int32_t *tl;
if (before_ret) {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = nfs_false;
} else {
nfsm_build(tl, u_int32_t *, 7 * NFSX_UNSIGNED);
*tl++ = 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(nfsd, after_ret, after_vap, mbp, bposp)
struct nfsrv_descript *nfsd;
int after_ret;
struct vattr *after_vap;
struct mbuf **mbp;
char **bposp;
{
register struct mbuf *mb = *mbp, *mb2;
register char *bpos = *bposp;
register u_int32_t *tl;
register struct nfs_fattr *fp;
if (after_ret) {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = nfs_false;
} else {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED + NFSX_V3FATTR);
*tl++ = nfs_true;
fp = (struct nfs_fattr *)tl;
nfsm_srvfattr(nfsd, after_vap, fp);
}
*mbp = mb;
*bposp = bpos;
}
void
nfsm_srvfattr(nfsd, vap, fp)
register struct nfsrv_descript *nfsd;
register struct vattr *vap;
register 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(umajor(vap->va_rdev));
fp->fa3_rdev.specdata2 = txdr_unsigned(uminor(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
* - if not lockflag unlock it with VOP_UNLOCK()
*/
int
nfsrv_fhtovp(fhp, lockflag, vpp, cred, slp, nam, rdonlyp, kerbflag, pubflag)
fhandle_t *fhp;
int lockflag;
struct vnode **vpp;
struct ucred *cred;
struct nfssvc_sock *slp;
struct sockaddr *nam;
int *rdonlyp;
int kerbflag;
int pubflag;
{
struct proc *p = curproc; /* XXX */
register struct mount *mp;
register int i;
struct ucred *credanon;
int error, exflags;
#ifdef MNT_EXNORESPORT /* XXX needs mountd and /etc/exports help yet */
struct sockaddr_int *saddr;
#endif
*vpp = (struct vnode *)0;
if (nfs_ispublicfh(fhp)) {
if (!pubflag || !nfs_pub.np_valid)
return (ESTALE);
fhp = &nfs_pub.np_handle;
}
mp = vfs_getvfs(&fhp->fh_fsid);
if (!mp)
return (ESTALE);
error = VFS_CHECKEXP(mp, nam, &exflags, &credanon);
if (error)
return (error);
error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp);
if (error)
return (error);
#ifdef MNT_EXNORESPORT
if (!(exflags & (MNT_EXNORESPORT|MNT_EXPUBLIC))) {
saddr = (struct sockaddr_in *)nam;
if (saddr->sin_family == AF_INET &&
ntohs(saddr->sin_port) >= IPPORT_RESERVED) {
vput(*vpp);
*vpp = NULL;
return (NFSERR_AUTHERR | AUTH_TOOWEAK);
}
}
#endif
/*
* Check/setup credentials.
*/
if (exflags & MNT_EXKERB) {
if (!kerbflag) {
vput(*vpp);
*vpp = NULL;
return (NFSERR_AUTHERR | AUTH_TOOWEAK);
}
} else if (kerbflag) {
vput(*vpp);
*vpp = NULL;
return (NFSERR_AUTHERR | AUTH_TOOWEAK);
} else if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
cred->cr_uid = credanon->cr_uid;
for (i = 0; i < credanon->cr_ngroups && i < NGROUPS; i++)
cred->cr_groups[i] = credanon->cr_groups[i];
cred->cr_ngroups = i;
}
if (exflags & MNT_EXRDONLY)
*rdonlyp = 1;
else
*rdonlyp = 0;
nfsrv_object_create(*vpp);
if (!lockflag)
VOP_UNLOCK(*vpp, 0, p);
return (0);
}
/*
* 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(fhp)
fhandle_t *fhp;
{
char *cp = (char *)fhp;
int i;
for (i = 0; i < NFSX_V3FH; i++)
if (*cp++ != 0)
return (FALSE);
return (TRUE);
}
#endif /* NFS_NOSERVER */
/*
* This function compares two net addresses by family and returns TRUE
* if they are the same host.
* If there is any doubt, return FALSE.
* The AF_INET family is handled as a special case so that address mbufs
* don't need to be saved to store "struct in_addr", which is only 4 bytes.
*/
int
netaddr_match(family, haddr, nam)
int family;
union nethostaddr *haddr;
struct sockaddr *nam;
{
register struct sockaddr_in *inetaddr;
switch (family) {
case AF_INET:
inetaddr = (struct sockaddr_in *)nam;
if (inetaddr->sin_family == AF_INET &&
inetaddr->sin_addr.s_addr == haddr->had_inetaddr)
return (1);
break;
#ifdef ISO
case AF_ISO:
{
register struct sockaddr_iso *isoaddr1, *isoaddr2;
isoaddr1 = (struct sockaddr_iso *)nam;
isoaddr2 = (struct sockaddr_iso *)haddr->had_nam;
if (isoaddr1->siso_family == AF_ISO &&
isoaddr1->siso_nlen > 0 &&
isoaddr1->siso_nlen == isoaddr2->siso_nlen &&
SAME_ISOADDR(isoaddr1, isoaddr2))
return (1);
break;
}
#endif /* ISO */
default:
break;
};
return (0);
}
static nfsuint64 nfs_nullcookie = { { 0, 0 } };
/*
* This function finds the directory cookie that corresponds to the
* logical byte offset given.
*/
nfsuint64 *
nfs_getcookie(np, off, add)
register struct nfsnode *np;
off_t off;
int add;
{
register struct nfsdmap *dp, *dp2;
register int pos;
pos = (uoff_t)off / NFS_DIRBLKSIZ;
if (pos == 0 || off < 0) {
#ifdef DIAGNOSTIC
if (add)
panic("nfs getcookie add at <= 0");
#endif
return (&nfs_nullcookie);
}
pos--;
dp = np->n_cookies.lh_first;
if (!dp) {
if (add) {
MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap),
M_NFSDIROFF, M_WAITOK);
dp->ndm_eocookie = 0;
LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
} else
return ((nfsuint64 *)0);
}
while (pos >= NFSNUMCOOKIES) {
pos -= NFSNUMCOOKIES;
if (dp->ndm_list.le_next) {
if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
pos >= dp->ndm_eocookie)
return ((nfsuint64 *)0);
dp = dp->ndm_list.le_next;
} else if (add) {
MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap),
M_NFSDIROFF, M_WAITOK);
dp2->ndm_eocookie = 0;
LIST_INSERT_AFTER(dp, dp2, ndm_list);
dp = dp2;
} else
return ((nfsuint64 *)0);
}
if (pos >= dp->ndm_eocookie) {
if (add)
dp->ndm_eocookie = pos + 1;
else
return ((nfsuint64 *)0);
}
return (&dp->ndm_cookies[pos]);
}
/*
* Invalidate cached directory information, except for the actual directory
* blocks (which are invalidated separately).
* Done mainly to avoid the use of stale offset cookies.
*/
void
nfs_invaldir(vp)
register struct vnode *vp;
{
register struct nfsnode *np = VTONFS(vp);
#ifdef DIAGNOSTIC
if (vp->v_type != VDIR)
panic("nfs: invaldir not dir");
#endif
np->n_direofoffset = 0;
np->n_cookieverf.nfsuquad[0] = 0;
np->n_cookieverf.nfsuquad[1] = 0;
if (np->n_cookies.lh_first)
np->n_cookies.lh_first->ndm_eocookie = 0;
}
/*
* The write verifier has changed (probably due to a server reboot), so all
* B_NEEDCOMMIT blocks will have to be written again. Since they are on the
* dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
* and B_CLUSTEROK flags. Once done the new write verifier can be set for the
* mount point.
*
* B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
* writes are not clusterable.
*/
void
nfs_clearcommit(mp)
struct mount *mp;
{
register struct vnode *vp, *nvp;
register struct buf *bp, *nbp;
int s;
s = splbio();
loop:
for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) {
if (vp->v_mount != mp) /* Paranoia */
goto loop;
nvp = vp->v_mntvnodes.le_next;
for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
nbp = TAILQ_NEXT(bp, b_vnbufs);
if (BUF_REFCNT(bp) == 0 &&
(bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
== (B_DELWRI | B_NEEDCOMMIT))
bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
}
}
splx(s);
}
#ifndef NFS_NOSERVER
/*
* Map errnos to NFS error numbers. For Version 3 also filter out error
* numbers not specified for the associated procedure.
*/
int
nfsrv_errmap(nd, err)
struct nfsrv_descript *nd;
register int err;
{
register short *defaulterrp, *errp;
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);
}
if (err <= ELAST)
return ((int)nfsrv_v2errmap[err - 1]);
return (NFSERR_IO);
}
int
nfsrv_object_create(vp)
struct vnode *vp;
{
if (vp == NULL || vp->v_type != VREG)
return (1);
return (vfs_object_create(vp, curproc,
curproc ? curproc->p_ucred : NULL));
}
/*
* 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(list, num)
register gid_t *list;
register int num;
{
register 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;
}
}
/*
* copy credentials making sure that the result can be compared with bcmp().
*/
void
nfsrv_setcred(incred, outcred)
register struct ucred *incred, *outcred;
{
register int i;
bzero((caddr_t)outcred, sizeof (struct ucred));
outcred->cr_ref = 1;
outcred->cr_uid = incred->cr_uid;
outcred->cr_ngroups = incred->cr_ngroups;
for (i = 0; i < incred->cr_ngroups; i++)
outcred->cr_groups[i] = incred->cr_groups[i];
nfsrvw_sort(outcred->cr_groups, outcred->cr_ngroups);
}
#endif /* NFS_NOSERVER */
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